diff --git a/.agents/skills/ask-matt/PHASE-BOUNDARIES.md b/.agents/skills/ask-matt/PHASE-BOUNDARIES.md
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+# Phase boundaries
+
+A **phase** is a chunk of work inside a session: the grilling, the implementation, the QA. The definition is fuzzy on purpose: a phase ends when you think *"ok, we're done with that"*.
+
+The **phase boundary** is the gap between two phases, and it is the only place this decision belongs. Mid-phase there is no decision to make: continue, or split the work that's left into subagents. Compacting mid-phase makes the agent lose the thread.
+
+## The five options
+
+| Option       | What it does                                                    |
+| ------------ | --------------------------------------------------------------- |
+| **Continue** | Stay in the session. No context switch at all.                    |
+| **`/clear`** | Empty the context window and start from nothing.                  |
+| **`/handoff`** | Write a portable markdown file and seed a session anywhere with it. |
+| **Subagent** | Send the task to its own context window and get a report back.     |
+| **`/compact`** | Compress this context and seed a fresh session with the summary.  |
+
+## The tree
+
+Work top to bottom at the boundary. The first **yes** wins.
+
+**1. Can you continue in this session?** Two things make the answer yes: the next phase needs this phase as a **primary source**, or you have enough [smart zone](https://www.aihero.dev/ai-coding-dictionary/smart-zone) left (~150k tokens) for the next phase to fit. Grilling → implementation is the standard yes: the implementation wants the reasoning verbatim, not a summary of it. Continue costs nothing and loses nothing, so rule it out before anything else.
+
+**2. Is the context irrelevant to what comes next?** Is everything in this session (the exploration, the decisions, the dead ends) disposable? If so, **`/clear`**. It is the cheapest move on the board: it takes no time and hands back the whole window. `/clear` also isn't terminal: the old session stays resumable.
+
+The cost of getting this wrong is one-way. Clear a *relevant* context and you lose the **why** behind what you built, and no amount of reading the diff back gets it returned.
+
+**3. Do you need to hand off?** `/handoff` is narrow. You need it only when you are:
+
+- swapping to a **new harness** (Claude → Codex),
+- moving to a **new directory** or repo,
+- sending the work to a **colleague**,
+- or forking a side task you found **mid-phase** without derailing what you're doing.
+
+That list is the whole clause. What `/handoff` buys is **portability**: a file that travels. If nothing is travelling, you don't need it.
+
+**4. Can the task be done AFK?** Is it scoped tightly enough to run with you away from the keyboard, no steering? Then send it to a **subagent** and leave this session untouched. Automated review is the standard case: the agent reads the diff and reports, and you aren't needed while it does.
+
+**5. Otherwise, `/compact`.** Relevant context, same harness, same directory, and you need to stay in the loop: this is where the tree lands, and it lands here often. Pass it an instruction (`/compact we're going to QA this area`) so the summary keeps what the next phase needs.
+
+`/compact` is the **default, not the first reach**. It sits at the bottom because the four questions above it are all cheaper or more precise. The failure mode when people start here is a fresh session that is confidently wrong about a decision the summary flattened.
+
+## Primary and secondary sources
+
+Every move except **Continue** turns a **primary source** into a **secondary source**: the session as it happened, replaced by a summary of it. The trade is always the same shape:
+
+| Source                            | Information | Noise | Room to move |
+| --------------------------------- | ----------- | ----- | ------------ |
+| Primary (Continue)                | Full        | Lots  | Little       |
+| Secondary (`/compact`, `/handoff`) | Lossy       | Less  | Lots         |
+
+This is why question 1 comes first. You only pay the lossiness when staying costs more than it saves.
+
+## These are judgement calls
+
+The questions are not objective: each has taste in it, and the same boundary can go two ways on two days. The value is in asking them **in order**, at the boundary rather than in the middle of the work.
diff --git a/.agents/skills/ask-matt/SKILL.md b/.agents/skills/ask-matt/SKILL.md
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+---
+name: ask-matt
+description: Ask which skill or flow fits your situation. A router over the skills in this repo.
+disable-model-invocation: true
+---
+
+# Ask Matt
+
+You don't remember every skill, so ask.
+
+A **flow** is a path through the skills. Most paths run along one **main flow**, and two **on-ramps** merge onto it. Everything else is standalone, or a vocabulary layer that runs underneath.
+
+## The main flow: idea → ship
+
+The route most work travels. You have an idea and want it built.
+
+1. **`/grill-with-docs`** sharpens the idea by interview. Start here whenever you are **working in a working directory**: it's stateful, retaining what it learns in `CONTEXT.md` and ADRs. (No working directory? Use `/grill-me` instead, covered under Standalone. Both run the same `/grilling` primitive; `grill-with-docs` is the one that leaves a paper trail, which makes it the better of the two whenever a repo is there to leave it in.)
+2. **Branch: can you settle every question in conversation?** If a question needs a runnable answer (state, business logic, a UI you have to see), detour through a prototype, bridged by **`/handoff`** in both directions (a prototype lives in its own directory, which is exactly what `/handoff` is for; see Phase boundaries):
+   - **`/handoff`** out, then open a fresh session against that file,
+   - **`/prototype`** to answer the question with throwaway code,
+   - **`/handoff`** back what you learned, and reference it from the original idea thread.
+3. **Branch: is this a multi-session build?**
+   - **Yes** → **`/to-spec`** (turn the thread into a spec), then **`/to-tickets`** to split it into tracer-bullet tickets, each declaring its **blocking edges**. On a local tracker that's one file per ticket under `.scratch/<feature>/issues/`, worked blockers-first by hand; on a real tracker the edges become native blocking links, so any ticket whose blockers are done can be grabbed: kick off **`/implement`** per ticket, **`/clear`ing context between each one**. Each ticket is self-contained, so the last one's context is disposable.
+   - **No** → **`/implement`** right here, in the same context window.
+
+   Either way, **`/implement`** builds each issue by driving **`/tdd`** internally (one red-green slice at a time), then closes out by running **`/code-review`**, a two-axis review (Standards + Spec) of the diff, before committing. Reach for **`/tdd`** on its own when you just want to build a concrete behaviour test-first without a full spec, and **`/code-review`** on its own whenever you want to review a branch or PR against a fixed point.
+
+### Context hygiene
+
+Keep steps 1–3 in **one unbroken context window** (don't compact or clear until after `/to-tickets`) so the grilling, spec, and tickets all build on the same thinking. Each `/implement` then starts fresh, working from the ticket.
+
+The limit on this is the **[smart zone](https://www.aihero.dev/ai-coding-dictionary/smart-zone)**: the window (~150k tokens on state-of-the-art models) within which the model still reasons sharply. If a session approaches it before `/to-tickets`, don't push on degraded; `/compact` at the nearest phase boundary and carry on (see Phase boundaries).
+
+## On-ramps
+
+A starting situation that generates work, then merges onto the main flow.
+
+- **Bugs and requests piling up** → **`/triage`**. It moves issues through triage roles and produces agent-ready issues, which **`/implement`** later picks up.
+
+  Triage is only for issues **you didn't create**: bug reports, incoming feature requests, anything that arrives raw. Tickets that `/to-tickets` produced are already agent-ready, so **don't triage them**.
+
+- **Something's broken** → **`/diagnosing-bugs`**. For the hard ones: the bug that resists a first glance, the intermittent flake, the regression that crept in between two known-good states. It refuses to theorise until it has a **tight feedback loop** (one command that already goes red on *this* bug), then fixes with a regression test. Its post-mortem hands off to **`/improve-codebase-architecture`** when the real finding is that there's no good seam to lock the bug down.
+
+- **A huge, foggy effort: a greenfield project or a huge feature build, too big for one session** → **`/wayfinder`**, the most cognitively demanding flow here. When the way from here to the destination isn't visible yet, it charts a **shared map** of **decision tickets** on the issue tracker and resolves them one at a time, producing **decisions, not deliverables**, until the fog is pushed back and the way is clear. Where **`/grill-with-docs`** sharpens an idea you can hold in one session, wayfinder is for the idea you can't, and it's slower and denser, so save it for exactly that, never a well-scoped feature.
+
+  When the map clears, **it hands off, it doesn't build**: merge onto the main flow at **`/to-spec`**, which collapses the map's linked decisions into a buildable plan, then `/to-tickets` and `/implement` as usual. Looping the map straight into `/implement` skips that collapse and throws the linked detail away, so go straight to `/implement` only when the effort turned out genuinely small.
+
+## Codebase health
+
+Not feature work, just upkeep.
+
+- **`/improve-codebase-architecture`** runs whenever you have a spare moment to keep the codebase good for agents to operate in. It surfaces **deepening opportunities**; picking one _generates an idea_ you can take into the main flow at `/grill-with-docs`. It's the survey that finds the candidates; **`/codebase-design`** (below) is the bench you design the chosen one on.
+
+## Vocabulary underneath
+
+Two model-invoked references that run *beneath* the other skills, each the single source of truth for its vocabulary. Reach for them directly when the **words**, not the process, are the problem; or let the skills above pull them in.
+
+- **`/domain-modeling`**: sharpen the project's *domain* language: challenge a fuzzy term, resolve an overloaded word ("account" doing three jobs), record a hard-to-reverse decision as an ADR. It's the active discipline `/grill-with-docs` drives to keep `CONTEXT.md` a clean glossary.
+- **`/codebase-design`** is the deep-module vocabulary (module, interface, depth, seam, adapter, leverage, locality) for designing a module's *shape*: a lot of behaviour behind a small interface at a clean seam. `/tdd` and `/improve-codebase-architecture` both speak it.
+
+## Phase boundaries
+
+A **phase** is a chunk of work inside a session: the grilling, the implementation, the QA. At the **boundary** between two of them you have five options, and picking between them is the fuzziest decision in this whole map:
+
+- **Continue**: stay put. Costs nothing, loses nothing.
+- **`/clear`**: empty the window, when nothing here matters to what's next.
+- **`/handoff`** writes a portable markdown file. Narrow: only for a **new harness**, a **new directory**, a **colleague**, or forking a side task **mid-phase**. What it buys is portability.
+- **Subagent**: send a tightly-scoped task to its own window and get a report back.
+- **`/compact`** compresses this context and seeds a fresh session with it. The **default**, at the bottom of the tree rather than the first reach.
+
+Read [PHASE-BOUNDARIES.md](PHASE-BOUNDARIES.md) for the ordered tree: the five questions, the reasoning behind each branch, and why the primary-source cost makes **Continue** the one to rule out first. Make the decision **at** a boundary; mid-phase, continue or split the rest into subagents.
+
+## Standalone
+
+Off the main flow entirely.
+
+- **`/grill-me`**: the same relentless interview as `/grill-with-docs`, but **stateless**: it saves nothing locally and builds no `CONTEXT.md`. Reach for it when you are **not working in a working directory** (sharpening a plan, a design, a piece of writing, anything with no repo under it). If you are in a working directory, use `/grill-with-docs` instead: it runs the same interview and leaves a paper trail, so it is strictly the better one.
+- **`/grilling`** is the interview primitive itself: rounds, the frontier, facts are the agent's job and decisions are yours. `/grill-me` and `/grill-with-docs` are the two named ways in, and `/triage`, `/wayfinder` and `/improve-codebase-architecture` all run it internally. Reach for it directly only when you want the interview with no wrapper around it.
+- **`/resolving-merge-conflicts`** works an in-progress merge or rebase conflict hunk by hunk, resolving by **intent** traced to each side's primary source rather than by picking lines, then finishes the operation. It never runs `--abort`. Standalone and off every flow: reach for it when you are already mid-conflict.
+- **`/prototype`** is a small, throwaway program that answers one design question: does this state model feel right, or what should this UI look like. Throwaway is a constraint on how the code is written, not a promise to destroy it: the answer folds into the real code, and the prototype itself is kept as a **primary source** on a `prototype/<name>` branch out of main, pointed at from the implementation issue. It's the detour in step 2 of the main flow, but reach for it any time a design question is hard to settle on paper.
+- **`/research`**: delegate reading legwork to a **background agent**: it investigates a question against **primary sources**, then leaves a cited Markdown file in the repo. Keep working while it reads. The file it produces is something to take *into* the main flow at `/grill-with-docs`, since research feeds the thinking rather than replacing it.
+- **`/to-questionnaire`** comes in when the thing blocking you isn't in your head or the codebase but in **someone else's**, and it writes them a questionnaire to fill in. It's the inverse of `/grill-me`: instead of interviewing you about the subject, it interviews you about the **send** (who it's going to, what you need back) and aims the questions at the gap. What comes back is material for `/grill-with-docs` or `/to-spec`.
+- **`/wizard`** is for the steps only a **human** can take: provisioning infrastructure, setting up credentials or CI secrets, clicking through an unfamiliar third-party dashboard, running a one-off migration or cutover. It generates an interactive bash script that opens each URL, captures each value, and writes it into `.env` and GitHub secrets, so the procedure stops being something you re-explain to an agent every time. Model-invoked, so the agent reaches for it the moment it hits a wall only you can pass. If the agent could just do it itself, it should; this is for where a human is genuinely in the loop.
+- **`/wait-what`** is the corrective for a message that didn't land. Use it mid-conversation, inside any other skill, and the agent re-pitches what it just said with the context you were missing, in plain English, using the `CONTEXT.md` vocabulary. It works after the fact; `/grill-with-docs` is the upfront cure, because a shared language agreed early is what stops the jargon arriving at all.
+- **`/teach`**: learn a concept over multiple sessions, using the current directory as a stateful workspace.
+- **`/writing-for-agents`** is the reference for writing documents agents consume: skills, AGENTS.md, pointed-at docs.
+
+## Precondition
+
+**`/setup-matt-pocock-skills`**: run before your first engineering flow to configure the issue tracker, triage labels, and doc layout the other skills assume. Custom issue trackers also work.
diff --git a/.agents/skills/ask-matt/agents/openai.yaml b/.agents/skills/ask-matt/agents/openai.yaml
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+interface:
+  display_name: "Ask Matt"
+  short_description: "Find the right skill or workflow"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/claude-handoff/SKILL.md b/.agents/skills/claude-handoff/SKILL.md
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+---
+name: claude-handoff
+description: Hand the current conversation off to a fresh background agent that picks up the work immediately.
+argument-hint: "What will the next session be used for?"
+disable-model-invocation: true
+---
+
+Write a handoff summary of the current conversation so a fresh agent can continue the work. Instead of saving it, launch a background agent seeded with the summary as its prompt: `claude --bg --name "<descriptive name>" "<handoff summary>"`. It starts in the current working directory and returns immediately; the user manages it with `claude agents`.
+
+Always pass `-n`/`--name` with a descriptive name (e.g. `--name "Fix login bug"`); it sets the display name shown in the job list, session picker, and terminal title.
+
+Include a "suggested skills" section in the summary, naming which skills the next agent should call the Skill tool for.
+
+Do not duplicate content already captured in other artifacts (specs, plans, ADRs, issues, commits, diffs). Reference them by path or URL instead.
+
+Redact any sensitive information, such as API keys, passwords, or personally identifiable information, since the summary becomes the agent's prompt.
+
+If the user passed arguments, treat them as a description of what the next session will focus on and tailor the summary accordingly.
diff --git a/.agents/skills/claude-handoff/agents/openai.yaml b/.agents/skills/claude-handoff/agents/openai.yaml
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index 00000000..0a7aa5da
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+++ b/.agents/skills/claude-handoff/agents/openai.yaml
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+interface:
+  display_name: "Claude Handoff"
+  short_description: "Hand off to a background agent"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/code-review/SKILL.md b/.agents/skills/code-review/SKILL.md
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+---
+name: code-review
+description: "Review the changes since a fixed point (commit, branch, tag, or merge-base) along two axes: Standards (does the code follow this repo's documented coding standards?) and Spec (does the code match what the originating issue/spec asked for?). Runs both reviews in parallel sub-agents and reports them side by side. Use when the user wants to review a branch, a PR, work-in-progress changes, or asks to \"review since X\"."
+---
+
+Two-axis review of the diff between `HEAD` and a fixed point the user supplies:
+
+- **Standards**: does the code conform to this repo's documented coding standards?
+- **Spec**: does the code faithfully implement the originating issue / spec?
+
+Both axes run as **parallel sub-agents** so they don't pollute each other's context, then this skill aggregates their findings.
+
+The issue tracker should have been provided to you. If `docs/agents/issue-tracker.md` is missing, tell the user to run `/setup-matt-pocock-skills`.
+
+## Process
+
+### 1. Pin the fixed point
+
+Whatever the user said is the fixed point (a commit SHA, branch name, tag, `main`, `HEAD~5`, etc.). If they didn't specify one, ask for it.
+
+Capture the diff command once: `git diff <fixed-point>...HEAD` (three-dot, so the comparison is against the merge-base). Also note the list of commits via `git log <fixed-point>..HEAD --oneline`.
+
+Before going further, confirm the fixed point resolves (`git rev-parse <fixed-point>`) and the diff is non-empty. A bad ref or empty diff should fail here, not inside two parallel sub-agents.
+
+### 2. Identify the spec source
+
+Look for the originating spec, in this order:
+
+1. Issue references in the commit messages (`#123`, `Closes #45`, GitLab `!67`, etc.), fetched via the workflow in `docs/agents/issue-tracker.md`.
+2. A path the user passed as an argument.
+3. A spec file under `docs/`, `specs/`, or `.scratch/` matching the branch name or feature.
+4. If nothing is found, ask the user where the spec is. If they say there isn't one, the **Spec** sub-agent will skip and report "no spec available".
+
+### 3. Identify the standards sources
+
+Anything in the repo that documents how code should be written, such as `CODING_STANDARDS.md` or `CONTRIBUTING.md`.
+
+On top of whatever the repo documents, the Standards axis always carries the **smell baseline** below: a fixed set of Fowler code smells (_Refactoring_, ch.3) that applies even when a repo documents nothing. Two rules bind it:
+
+- **The repo overrides.** A documented repo standard always wins; where it endorses something the baseline would flag, suppress the smell.
+- **Always a judgement call.** Each smell is a labelled heuristic ("possible Feature Envy"), never a hard violation. Like any standard here, skip anything tooling already enforces.
+
+Each smell reads *what it is* → *how to fix*; match it against the diff:
+
+- **Mysterious Name**: a function, variable, or type whose name doesn't reveal what it does or holds. → rename it; if no honest name comes, the design's murky.
+- **Duplicated Code**: the same logic shape appears in more than one hunk or file in the change. → extract the shared shape, call it from both.
+- **Feature Envy**: a method that reaches into another object's data more than its own. → move the method onto the data it envies.
+- **Data Clumps**: the same few fields or params keep travelling together (a type wanting to be born). → bundle them into one type, pass that.
+- **Primitive Obsession**: a primitive or string standing in for a domain concept that deserves its own type. → give the concept its own small type.
+- **Repeated Switches**: the same `switch`/`if`-cascade on the same type recurs across the change. → replace with polymorphism, or one map both sites share.
+- **Shotgun Surgery**: one logical change forces scattered edits across many files in the diff. → gather what changes together into one module.
+- **Divergent Change**: one file or module is edited for several unrelated reasons. → split so each module changes for one reason.
+- **Speculative Generality**: abstraction, parameters, or hooks added for needs the spec doesn't have. → delete it; inline back until a real need shows.
+- **Message Chains**: long `a.b().c().d()` navigation the caller shouldn't depend on. → hide the walk behind one method on the first object.
+- **Middle Man**: a class or function that mostly just delegates onward. → cut it, call the real target direct.
+- **Refused Bequest**: a subclass or implementer that ignores or overrides most of what it inherits. → drop the inheritance, use composition.
+
+### 4. Spawn both sub-agents in parallel
+
+**Standards sub-agent prompt** should include:
+
+- The full diff command and commit list.
+- The list of standards-source files you found in step 3, **plus the smell baseline from step 3** pasted in full (the sub-agent has no other access to it).
+- The brief: "Report, per file/hunk where relevant, (a) every place the diff violates a documented standard: cite the standard (file + the rule); and (b) any baseline smell you spot: name it and quote the hunk. Distinguish hard violations from judgement calls: documented-standard breaches can be hard, but baseline smells are always judgement calls, and a documented repo standard overrides the baseline. Skip anything tooling enforces. Under 400 words."
+
+**Spec sub-agent prompt** should include:
+
+- The diff command and commit list.
+- The path or fetched contents of the spec.
+- The brief: "Report: (a) requirements the spec asked for that are missing or partial; (b) behaviour in the diff that wasn't asked for (scope creep); (c) requirements that look implemented but where the implementation looks wrong. Quote the spec line for each finding. Under 400 words."
+
+If the spec is missing, skip the Spec sub-agent and note this in the final report.
+
+### 5. Aggregate
+
+Present the two reports under `## Standards` and `## Spec` headings, verbatim or lightly cleaned. Do **not** merge or rerank findings, because the two axes are deliberately separate (see _Why two axes_).
+
+End with a one-line summary: total findings per axis, and the worst issue _within each axis_ (if any). Don't pick a single winner across axes: that's the reranking the separation exists to prevent.
+
+## Why two axes
+
+A change can pass one axis and fail the other:
+
+- Code that follows every standard but implements the wrong thing → **Standards pass, Spec fail.**
+- Code that does exactly what the issue asked but breaks the project's conventions → **Spec pass, Standards fail.**
+
+Reporting them separately stops one axis from masking the other.
diff --git a/.agents/skills/code-review/agents/openai.yaml b/.agents/skills/code-review/agents/openai.yaml
new file mode 100644
index 00000000..9076774b
--- /dev/null
+++ b/.agents/skills/code-review/agents/openai.yaml
@@ -0,0 +1,3 @@
+interface:
+  display_name: "Code Review"
+  short_description: "Review a diff on standards and spec"
diff --git a/.agents/skills/codebase-design/DEEPENING.md b/.agents/skills/codebase-design/DEEPENING.md
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+++ b/.agents/skills/codebase-design/DEEPENING.md
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+# Deepening
+
+How to deepen a cluster of shallow modules safely, given its dependencies. Assumes the vocabulary in [SKILL.md](SKILL.md): **module**, **interface**, **seam**, **adapter**.
+
+## Dependency categories
+
+When assessing a candidate for deepening, classify its dependencies. The category determines how the deepened module is tested across its seam.
+
+### 1. In-process
+
+Pure computation, in-memory state, no I/O. Always deepenable: merge the modules and test through the new interface directly. No adapter needed.
+
+### 2. Local-substitutable
+
+Dependencies that have local test stand-ins (PGLite for Postgres, in-memory filesystem). Deepenable if the stand-in exists. The deepened module is tested with the stand-in running in the test suite. The seam is internal; no port at the module's external interface.
+
+### 3. Remote but owned (Ports & Adapters)
+
+Your own services across a network boundary (microservices, internal APIs). Define a **port** (interface) at the seam. The deep module owns the logic; the transport is injected as an **adapter**. Tests use an in-memory adapter. Production uses an HTTP/gRPC/queue adapter.
+
+Recommendation shape: *"Define a port at the seam, implement an HTTP adapter for production and an in-memory adapter for testing, so the logic sits in one deep module even though it's deployed across a network."*
+
+### 4. True external (Mock)
+
+Third-party services (Stripe, Twilio, etc.) you don't control. The deepened module takes the external dependency as an injected port; tests provide a mock adapter.
+
+## Seam discipline
+
+- **One adapter means a hypothetical seam. Two adapters means a real one.** Don't introduce a port unless at least two adapters are justified (typically production + test). A single-adapter seam is just indirection.
+- **Internal seams vs external seams.** A deep module can have internal seams (private to its implementation, used by its own tests) as well as the external seam at its interface. Don't expose internal seams through the interface just because tests use them.
+
+## Testing strategy: replace, don't layer
+
+- Old unit tests on shallow modules become waste once tests at the deepened module's interface exist; delete them.
+- Write new tests at the deepened module's interface. The **interface is the test surface**.
+- Tests assert on observable outcomes through the interface, not internal state.
+- Tests should survive internal refactors, since they describe behaviour, not implementation. If a test has to change when the implementation changes, it's testing past the interface.
diff --git a/.agents/skills/codebase-design/DESIGN-IT-TWICE.md b/.agents/skills/codebase-design/DESIGN-IT-TWICE.md
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+# Design It Twice
+
+When the user wants to explore alternative interfaces for a chosen deepening candidate, use this parallel sub-agent pattern. Based on "Design It Twice" (Ousterhout): your first idea is unlikely to be the best.
+
+Uses the vocabulary in [SKILL.md](SKILL.md): **module**, **interface**, **seam**, **adapter**, **leverage**.
+
+## Process
+
+### 1. Frame the problem space
+
+Before spawning sub-agents, write a user-facing explanation of the problem space for the chosen candidate:
+
+- The constraints any new interface would need to satisfy
+- The dependencies it would rely on, and which category they fall into (see [DEEPENING.md](DEEPENING.md))
+- A rough illustrative code sketch to ground the constraints, not a proposal, just a way to make the constraints concrete
+
+Show this to the user, then immediately proceed to Step 2. The user reads and thinks while the sub-agents work in parallel.
+
+### 2. Spawn sub-agents
+
+Spawn 3+ sub-agents in parallel. Each must produce a **radically different** interface for the deepened module.
+
+Prompt each sub-agent with a separate technical brief (file paths, coupling details, dependency category from [DEEPENING.md](DEEPENING.md), what sits behind the seam). The brief is independent of the user-facing problem-space explanation in Step 1. Give each agent a different design constraint:
+
+- Agent 1: "Minimize the interface: aim for 1–3 entry points max. Maximise leverage per entry point."
+- Agent 2: "Maximise flexibility: support many use cases and extension."
+- Agent 3: "Optimise for the most common caller: make the default case trivial."
+- Agent 4 (if applicable): "Design around ports & adapters for cross-seam dependencies."
+
+Include both [SKILL.md](SKILL.md) vocabulary and CONTEXT.md vocabulary in the brief so each sub-agent names things consistently with the architecture language and the project's domain language.
+
+Each sub-agent outputs:
+
+1. Interface (types, methods, params, plus invariants, ordering, error modes)
+2. Usage example showing how callers use it
+3. What the implementation hides behind the seam
+4. Dependency strategy and adapters (see [DEEPENING.md](DEEPENING.md))
+5. Trade-offs: where leverage is high, where it's thin
+
+### 3. Present and compare
+
+Present designs sequentially so the user can absorb each one, then compare them in prose. Contrast by **depth** (leverage at the interface), **locality** (where change concentrates), and **seam placement**.
+
+After comparing, give your own recommendation: which design you think is strongest and why. If elements from different designs would combine well, propose a hybrid. Be opinionated: the user wants a strong read, not a menu.
diff --git a/.agents/skills/codebase-design/SKILL.md b/.agents/skills/codebase-design/SKILL.md
new file mode 100644
index 00000000..3f63c814
--- /dev/null
+++ b/.agents/skills/codebase-design/SKILL.md
@@ -0,0 +1,114 @@
+---
+name: codebase-design
+description: Shared vocabulary for designing deep modules. Use when the user wants to design or improve a module's interface, find deepening opportunities, decide where a seam goes, make code more testable or AI-navigable, or when another skill needs the deep-module vocabulary.
+---
+
+# Codebase Design
+
+Design **deep modules**: a lot of behaviour behind a small interface, placed at a clean seam, testable through that interface. Use this language and these principles wherever code is being designed or restructured. The aim is leverage for callers, locality for maintainers, and testability for everyone.
+
+## Glossary
+
+Use these terms exactly: don't substitute "component," "service," "API," or "boundary." Consistent language is the whole point.
+
+**Module**: anything with an interface and an implementation. Deliberately scale-agnostic: a function, class, package, or tier-spanning slice. _Avoid_: unit, component, service.
+
+**Interface**: everything a caller must know to use the module correctly: the type signature, but also invariants, ordering constraints, error modes, required configuration, and performance characteristics. _Avoid_: API, signature (too narrow, they refer only to the type-level surface).
+
+**Implementation**: what's inside a module, its body of code. Distinct from **Adapter**: a thing can be a small adapter with a large implementation (a Postgres repo) or a large adapter with a small implementation (an in-memory fake). Reach for "adapter" when the seam is the topic; "implementation" otherwise.
+
+**Depth**: leverage at the interface. The amount of behaviour a caller (or test) can exercise per unit of interface they have to learn. A module is **deep** when a large amount of behaviour sits behind a small interface, **shallow** when the interface is nearly as complex as the implementation.
+
+**Seam** _(Michael Feathers)_: a place where you can alter behaviour without editing in that place; the *location* at which a module's interface lives. Where to put the seam is its own design decision, distinct from what goes behind it. _Avoid_: boundary (overloaded with DDD's bounded context).
+
+**Adapter**: a concrete thing that satisfies an interface at a seam. Describes *role* (what slot it fills), not substance (what's inside).
+
+**Leverage**: what callers get from depth. More capability per unit of interface they learn. One implementation pays back across N call sites and M tests.
+
+**Locality**: what maintainers get from depth. Change, bugs, knowledge, and verification concentrate in one place rather than spreading across callers. Fix once, fixed everywhere.
+
+## Deep vs shallow
+
+**Deep module** = small interface + lots of implementation:
+
+```
+┌─────────────────────┐
+│   Small Interface   │  ← Few methods, simple params
+├─────────────────────┤
+│                     │
+│  Deep Implementation│  ← Complex logic hidden
+│                     │
+└─────────────────────┘
+```
+
+**Shallow module** = large interface + little implementation (avoid):
+
+```
+┌─────────────────────────────────┐
+│       Large Interface           │  ← Many methods, complex params
+├─────────────────────────────────┤
+│  Thin Implementation            │  ← Just passes through
+└─────────────────────────────────┘
+```
+
+When designing an interface, ask:
+
+- Can I reduce the number of methods?
+- Can I simplify the parameters?
+- Can I hide more complexity inside?
+
+## Principles
+
+- **Depth is a property of the interface, not the implementation.** A deep module can be internally composed of small, mockable, swappable parts; they just aren't part of the interface. A module can have **internal seams** (private to its implementation, used by its own tests) as well as the **external seam** at its interface.
+- **The deletion test.** Imagine deleting the module. If complexity vanishes, it was a pass-through. If complexity reappears across N callers, it was earning its keep.
+- **The interface is the test surface.** Callers and tests cross the same seam. If you want to test *past* the interface, the module is probably the wrong shape.
+- **One adapter means a hypothetical seam. Two adapters means a real one.** Don't introduce a seam unless something actually varies across it.
+
+## Designing for testability
+
+Good interfaces make testing natural:
+
+1. **Accept dependencies, don't create them.**
+
+   ```typescript
+   // Testable
+   function processOrder(order, paymentGateway) {}
+
+   // Hard to test
+   function processOrder(order) {
+     const gateway = new StripeGateway();
+   }
+   ```
+
+2. **Return results, don't produce side effects.**
+
+   ```typescript
+   // Testable
+   function calculateDiscount(cart): Discount {}
+
+   // Hard to test
+   function applyDiscount(cart): void {
+     cart.total -= discount;
+   }
+   ```
+
+3. **Small surface area.** Fewer methods = fewer tests needed. Fewer params = simpler test setup.
+
+## Relationships
+
+- A **Module** has exactly one **Interface** (the surface it presents to callers and tests).
+- **Depth** is a property of a **Module**, measured against its **Interface**.
+- A **Seam** is where a **Module**'s **Interface** lives.
+- An **Adapter** sits at a **Seam** and satisfies the **Interface**.
+- **Depth** produces **Leverage** for callers and **Locality** for maintainers.
+
+## Rejected framings
+
+- **Depth as ratio of implementation-lines to interface-lines** (Ousterhout): rewards padding the implementation. We use depth-as-leverage instead.
+- **"Interface" as the TypeScript `interface` keyword or a class's public methods**: too narrow: interface here includes every fact a caller must know.
+- **"Boundary"**: overloaded with DDD's bounded context. Say **seam** or **interface**.
+
+## Going deeper
+
+- **Deepening a cluster given its dependencies**, see [DEEPENING.md](DEEPENING.md): dependency categories, seam discipline, and replace-don't-layer testing.
+- **Exploring alternative interfaces**, see [DESIGN-IT-TWICE.md](DESIGN-IT-TWICE.md): spin up parallel sub-agents to design the interface several radically different ways, then compare on depth, locality, and seam placement.
diff --git a/.agents/skills/codebase-design/agents/openai.yaml b/.agents/skills/codebase-design/agents/openai.yaml
new file mode 100644
index 00000000..3180715e
--- /dev/null
+++ b/.agents/skills/codebase-design/agents/openai.yaml
@@ -0,0 +1,3 @@
+interface:
+  display_name: "Codebase Design"
+  short_description: "Vocabulary for deep-module design"
diff --git a/.agents/skills/diagnosing-bugs/SKILL.md b/.agents/skills/diagnosing-bugs/SKILL.md
new file mode 100644
index 00000000..061c25a5
--- /dev/null
+++ b/.agents/skills/diagnosing-bugs/SKILL.md
@@ -0,0 +1,138 @@
+---
+name: diagnosing-bugs
+description: Diagnosis loop for hard bugs and performance regressions. Use when the user says "diagnose"/"debug this", or reports something broken/throwing/failing/slow.
+---
+
+# Diagnosing Bugs
+
+A discipline for hard bugs. Skip phases only when explicitly justified.
+
+When exploring the codebase, read `CONTEXT.md` (if it exists) to get a clear mental model of the relevant modules, and check ADRs in the area you're touching.
+
+## Redact
+
+This skill has you show commands, outputs and captured artifacts. **Redact every secret first**: write `<REDACTED>` in its place. Build loops against env vars, so the credential stays in the environment rather than in what you show. Captured artifacts carry auth headers: quote only the lines that carry the signal.
+
+If the redacted output is not enough to diagnose the bug, say so and ask the user.
+
+## Phase 1: Build a feedback loop
+
+**This is the skill.** Everything else is mechanical. If you have a **tight** pass/fail signal for the bug (one that goes red on _this_ bug), you will find the cause; bisection, hypothesis-testing, and instrumentation all just consume it. If you don't have one, no amount of staring at code will save you.
+
+Spend disproportionate effort here. **Be aggressive. Be creative. Refuse to give up.**
+
+### Ways to construct one, in roughly this order
+
+1. **Failing test** at whatever seam reaches the bug: unit, integration, e2e.
+2. **Curl / HTTP script** against a running dev server.
+3. **CLI invocation** with a fixture input, diffing stdout against a known-good snapshot.
+4. **Headless browser script** (Playwright / Puppeteer) that drives the UI and asserts on DOM/console/network.
+5. **Replay a captured trace.** Save a real network request / payload / event log to disk; replay it through the code path in isolation.
+6. **Throwaway harness.** Spin up a minimal subset of the system (one service, mocked deps) that exercises the bug code path with a single function call.
+7. **Property / fuzz loop.** If the bug is "sometimes wrong output", run 1000 random inputs and look for the failure mode.
+8. **Bisection harness.** If the bug appeared between two known states (commit, dataset, version), automate "boot at state X, check, repeat" so you can `git bisect run` it.
+9. **Differential loop.** Run the same input through old-version vs new-version (or two configs) and diff outputs.
+10. **HITL bash script.** Last resort. If a human must click, drive _them_ with `scripts/hitl-loop.template.sh` so the loop is still structured. Captured output feeds back to you.
+
+Build the right feedback loop, and the bug is 90% fixed.
+
+### Tighten the loop
+
+Treat the loop as a product. Once you have _a_ loop, **tighten** it:
+
+- Can I make it faster? (Cache setup, skip unrelated init, narrow the test scope.)
+- Can I make the signal sharper? (Assert on the specific symptom, not "didn't crash".)
+- Can I make it more deterministic? (Pin time, seed RNG, isolate filesystem, freeze network.)
+
+A 30-second flaky loop is barely better than no loop; a 2-second deterministic one is tight, a debugging superpower.
+
+### Non-deterministic bugs
+
+The goal is not a clean repro but a **higher reproduction rate**. Loop the trigger 100×, parallelise, add stress, narrow timing windows, inject sleeps. A 50%-flake bug is debuggable; 1% is not, so keep raising the rate until it's debuggable.
+
+### When you genuinely cannot build a loop
+
+Stop and say so explicitly. List what you tried. Ask the user for: (a) access to whatever environment reproduces it, (b) a redacted captured artifact (HAR file, log dump, core dump, screen recording with timestamps), or (c) permission to add temporary production instrumentation. Do **not** proceed to hypothesise without a loop.
+
+### Completion criterion: a tight loop that goes red
+
+Phase 1 is done when the loop is **tight** and **red-capable**: you can name **one command** (a script path, a test invocation, a curl) that you have **already run at least once** (show the invocation and its output, redacted), and that is:
+
+- [ ] **Red-capable**: it drives the actual bug code path and asserts the **user's exact symptom**, so it can go red on this bug and green once fixed. Not "runs without erroring"; it must be able to _catch this specific bug_.
+- [ ] **Deterministic**: same verdict every run (flaky bugs: a pinned, high reproduction rate, per above).
+- [ ] **Fast**: seconds, not minutes.
+- [ ] **Agent-runnable**: you can run it unattended; a human in the loop only via `scripts/hitl-loop.template.sh`.
+
+If you catch yourself reading code to build a theory before this command exists, **stop: jumping straight to a hypothesis is the exact failure this skill prevents.** No red-capable command, no Phase 2.
+
+## Phase 2: Reproduce + minimise
+
+Run the loop. Watch it go red as the bug appears.
+
+Confirm:
+
+- [ ] The loop produces the failure mode the **user** described, not a different failure that happens to be nearby. Wrong bug = wrong fix.
+- [ ] The failure is reproducible across multiple runs (or, for non-deterministic bugs, reproducible at a high enough rate to debug against).
+- [ ] You have captured the exact symptom (error message, wrong output, slow timing) so later phases can verify the fix actually addresses it.
+
+### Minimise
+
+Once it's red, shrink the repro to the **smallest scenario that still goes red**. Cut inputs, callers, config, data, and steps **one at a time**, re-running the loop after each cut, and keep only what's load-bearing for the failure.
+
+Why bother: a minimal repro shrinks the hypothesis space in Phase 3 (fewer moving parts left to suspect) and becomes the clean regression test in Phase 5.
+
+Done when **every remaining element is load-bearing**: removing any one of them makes the loop go green.
+
+Do not proceed until you have reproduced **and** minimised.
+
+## Phase 3: Hypothesise
+
+Generate **3–5 ranked hypotheses** before testing any of them. Single-hypothesis generation anchors on the first plausible idea.
+
+Each hypothesis must be **falsifiable**: state the prediction it makes.
+
+> Format: "If <X> is the cause, then <changing Y> will make the bug disappear / <changing Z> will make it worse."
+
+If you cannot state the prediction, the hypothesis is a vibe: discard or sharpen it.
+
+**Show the ranked list to the user before testing.** They often have domain knowledge that re-ranks instantly ("we just deployed a change to #3"), or know hypotheses they've already ruled out. Cheap checkpoint, big time saver. Don't block on it; proceed with your ranking if the user is AFK.
+
+## Phase 4: Instrument
+
+Each probe must map to a specific prediction from Phase 3. **Change one variable at a time.**
+
+Tool preference:
+
+1. **Debugger / REPL inspection** if the env supports it. One breakpoint beats ten logs.
+2. **Targeted logs** at the boundaries that distinguish hypotheses.
+3. Never "log everything and grep".
+
+**Tag every debug log** with a unique prefix, e.g. `[DEBUG-a4f2]`. Cleanup at the end becomes a single grep. Untagged logs survive; tagged logs die.
+
+**Perf branch.** For performance regressions, logs are usually wrong. Instead: establish a baseline measurement (timing harness, `performance.now()`, profiler, query plan), then bisect. Measure first, fix second.
+
+## Phase 5: Fix + regression test
+
+Write the regression test **before the fix**, but only if there is a **correct seam** for it.
+
+A correct seam is one where the test exercises the **real bug pattern** as it occurs at the call site. If the only available seam is too shallow (single-caller test when the bug needs multiple callers, unit test that can't replicate the chain that triggered the bug), a regression test there gives false confidence.
+
+**If no correct seam exists, that itself is the finding.** Note it. The codebase architecture is preventing the bug from being locked down. Flag this for the next phase.
+
+If a correct seam exists:
+
+1. Turn the minimised repro into a failing test at that seam.
+2. Watch it fail.
+3. Apply the fix.
+4. Watch it pass.
+5. Re-run the Phase 1 feedback loop against the original (un-minimised) scenario.
+
+## Phase 6: Cleanup
+
+Required before declaring done:
+
+- [ ] Original repro no longer reproduces (re-run the Phase 1 loop)
+- [ ] Regression test passes (or absence of seam is documented)
+- [ ] All `[DEBUG-...]` instrumentation removed (`grep` the prefix)
+- [ ] Throwaway prototypes deleted (or moved to a clearly-marked debug location)
+- [ ] The hypothesis that turned out correct is stated in the commit / PR message, so the next debugger learns
diff --git a/.agents/skills/diagnosing-bugs/agents/openai.yaml b/.agents/skills/diagnosing-bugs/agents/openai.yaml
new file mode 100644
index 00000000..a13a755a
--- /dev/null
+++ b/.agents/skills/diagnosing-bugs/agents/openai.yaml
@@ -0,0 +1,3 @@
+interface:
+  display_name: "Diagnosing Bugs"
+  short_description: "Diagnose hard bugs and regressions"
diff --git a/.agents/skills/diagnosing-bugs/scripts/hitl-loop.template.sh b/.agents/skills/diagnosing-bugs/scripts/hitl-loop.template.sh
new file mode 100644
index 00000000..24319846
--- /dev/null
+++ b/.agents/skills/diagnosing-bugs/scripts/hitl-loop.template.sh
@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+# Human-in-the-loop reproduction loop.
+# Copy this file, edit the steps below, and run it.
+# The agent runs the script; the user follows prompts in their terminal.
+#
+# Usage:
+#   bash hitl-loop.template.sh
+#
+# Two helpers:
+#   step "<instruction>"          → show instruction, wait for Enter
+#   capture VAR "<question>"      → show question, read response into VAR
+#
+# At the end, captured values are printed as KEY=VALUE for the agent to parse.
+#
+# `capture` prints its value back to the terminal, where the agent reads it,
+# so capture observations, and leave signing in to the user as a `step`.
+
+set -euo pipefail
+
+step() {
+  printf '\n>>> %s\n' "$1"
+  read -r -p "    [Enter when done] " _
+}
+
+capture() {
+  local var="$1" question="$2" answer
+  printf '\n>>> %s\n' "$question"
+  read -r -p "    > " answer
+  printf -v "$var" '%s' "$answer"
+}
+
+# --- edit below ---------------------------------------------------------
+
+step "Open the app at http://localhost:3000 and sign in."
+
+capture ERRORED "Click the 'Export' button. Did it throw an error? (y/n)"
+
+capture ERROR_MSG "Paste the error message (or 'none'):"
+
+# --- edit above ---------------------------------------------------------
+
+printf '\n--- Captured ---\n'
+printf 'ERRORED=%s\n' "$ERRORED"
+printf 'ERROR_MSG=%s\n' "$ERROR_MSG"
diff --git a/.agents/skills/domain-modeling/ADR-FORMAT.md b/.agents/skills/domain-modeling/ADR-FORMAT.md
new file mode 100644
index 00000000..d7e61f30
--- /dev/null
+++ b/.agents/skills/domain-modeling/ADR-FORMAT.md
@@ -0,0 +1,47 @@
+# ADR Format
+
+ADRs live in `docs/adr/` and use sequential numbering: `0001-slug.md`, `0002-slug.md`, etc.
+
+Create the `docs/adr/` directory lazily: only when the first ADR is needed.
+
+## Template
+
+```md
+# {Short title of the decision}
+
+{1-3 sentences: what's the context, what did we decide, and why.}
+```
+
+That's it. An ADR can be a single paragraph. The value is in recording *that* a decision was made and *why*, not in filling out sections.
+
+## Optional sections
+
+Only include these when they add genuine value. Most ADRs won't need them.
+
+- **Status** frontmatter (`proposed | accepted | deprecated | superseded by ADR-NNNN`): useful when decisions are revisited
+- **Considered Options**: only when the rejected alternatives are worth remembering
+- **Consequences**: only when non-obvious downstream effects need to be called out
+
+## Numbering
+
+Scan `docs/adr/` for the highest existing number and increment by one.
+
+## When to offer an ADR
+
+All three of these must be true:
+
+1. **Hard to reverse**: the cost of changing your mind later is meaningful
+2. **Surprising without context**: a future reader will look at the code and wonder "why on earth did they do it this way?"
+3. **The result of a real trade-off**: there were genuine alternatives and you picked one for specific reasons
+
+If a decision is easy to reverse, skip it: you'll just reverse it. If it's not surprising, nobody will wonder why. If there was no real alternative, there's nothing to record beyond "we did the obvious thing."
+
+### What qualifies
+
+- **Architectural shape.** "We're using a monorepo." "The write model is event-sourced, the read model is projected into Postgres."
+- **Integration patterns between contexts.** "Ordering and Billing communicate via domain events, not synchronous HTTP."
+- **Technology choices that carry lock-in.** Database, message bus, auth provider, deployment target. Not every library: just the ones that would take a quarter to swap out.
+- **Boundary and scope decisions.** "Customer data is owned by the Customer context; other contexts reference it by ID only." The explicit no-s are as valuable as the yes-s.
+- **Deliberate deviations from the obvious path.** "We're using manual SQL instead of an ORM because X." Anything where a reasonable reader would assume the opposite. These stop the next engineer from "fixing" something that was deliberate.
+- **Constraints not visible in the code.** "We can't use AWS because of compliance requirements." "Response times must be under 200ms because of the partner API contract."
+- **Rejected alternatives when the rejection is non-obvious.** If you considered GraphQL and picked REST for subtle reasons, record it; otherwise someone will suggest GraphQL again in six months.
diff --git a/.agents/skills/domain-modeling/CONTEXT-FORMAT.md b/.agents/skills/domain-modeling/CONTEXT-FORMAT.md
new file mode 100644
index 00000000..79bbb32f
--- /dev/null
+++ b/.agents/skills/domain-modeling/CONTEXT-FORMAT.md
@@ -0,0 +1,60 @@
+# CONTEXT.md Format
+
+## Structure
+
+```md
+# {Context Name}
+
+{One or two sentence description of what this context is and why it exists.}
+
+## Language
+
+**Order**:
+{A one or two sentence description of the term}
+_Avoid_: Purchase, transaction
+
+**Invoice**:
+A request for payment sent to a customer after delivery.
+_Avoid_: Bill, payment request
+
+**Customer**:
+A person or organization that places orders.
+_Avoid_: Client, buyer, account
+```
+
+## Rules
+
+- **Be opinionated.** When multiple words exist for the same concept, pick the best one and list the others under `_Avoid_`.
+- **Keep definitions tight.** One or two sentences max. Define what it IS, not what it does.
+- **Only include terms specific to this project's context.** General programming concepts (timeouts, error types, utility patterns) don't belong even if the project uses them extensively. Before adding a term, ask: is this a concept unique to this context, or a general programming concept? Only the former belongs.
+- **Group terms under subheadings** when natural clusters emerge. If all terms belong to a single cohesive area, a flat list is fine.
+
+## Single vs multi-context repos
+
+**Single context (most repos):** One `CONTEXT.md` at the repo root.
+
+**Multiple contexts:** A `CONTEXT-MAP.md` at the repo root lists the contexts, where they live, and how they relate to each other:
+
+```md
+# Context Map
+
+## Contexts
+
+- [Ordering](./src/ordering/CONTEXT.md): receives and tracks customer orders
+- [Billing](./src/billing/CONTEXT.md): generates invoices and processes payments
+- [Fulfillment](./src/fulfillment/CONTEXT.md): manages warehouse picking and shipping
+
+## Relationships
+
+- **Ordering → Fulfillment**: Ordering emits `OrderPlaced` events; Fulfillment consumes them to start picking
+- **Fulfillment → Billing**: Fulfillment emits `ShipmentDispatched` events; Billing consumes them to generate invoices
+- **Ordering ↔ Billing**: Shared types for `CustomerId` and `Money`
+```
+
+The skill infers which structure applies:
+
+- If `CONTEXT-MAP.md` exists, read it to find contexts
+- If only a root `CONTEXT.md` exists, single context
+- If neither exists, create a root `CONTEXT.md` lazily when the first term is resolved
+
+When multiple contexts exist, infer which one the current topic relates to. If unclear, ask.
diff --git a/.agents/skills/domain-modeling/SKILL.md b/.agents/skills/domain-modeling/SKILL.md
new file mode 100644
index 00000000..9b97707e
--- /dev/null
+++ b/.agents/skills/domain-modeling/SKILL.md
@@ -0,0 +1,74 @@
+---
+name: domain-modeling
+description: Build and sharpen a project's domain model. Use when discussing codebase terminology, writing or editing a CONTEXT.md, or recording or editing an ADR.
+---
+
+# Domain Modeling
+
+Actively build and sharpen the project's domain model as you design. This is the *active* discipline: challenging terms, inventing edge-case scenarios, and writing the glossary and decisions down the moment they crystallise. (Merely *reading* `CONTEXT.md` for vocabulary is not this skill: that's a one-line habit any skill can do. This skill is for when you're changing the model, not just consuming it.)
+
+## File structure
+
+Most repos have a single context:
+
+```
+/
+├── CONTEXT.md
+├── docs/
+│   └── adr/
+│       ├── 0001-event-sourced-orders.md
+│       └── 0002-postgres-for-write-model.md
+└── src/
+```
+
+If a `CONTEXT-MAP.md` exists at the root, the repo has multiple contexts. The map points to where each one lives:
+
+```
+/
+├── CONTEXT-MAP.md
+├── docs/
+│   └── adr/                          ← system-wide decisions
+├── src/
+│   ├── ordering/
+│   │   ├── CONTEXT.md
+│   │   └── docs/adr/                 ← context-specific decisions
+│   └── billing/
+│       ├── CONTEXT.md
+│       └── docs/adr/
+```
+
+Create files lazily: only when you have something to write. If no `CONTEXT.md` exists, create one when the first term is resolved. If no `docs/adr/` exists, create it when the first ADR is needed.
+
+## During the session
+
+### Challenge against the glossary
+
+When the user uses a term that conflicts with the existing language in `CONTEXT.md`, call it out immediately. "Your glossary defines 'cancellation' as X, but you seem to mean Y. Which is it?"
+
+### Sharpen fuzzy language
+
+When the user uses vague or overloaded terms, propose a precise canonical term. "You're saying 'account': do you mean the Customer or the User? Those are different things."
+
+### Discuss concrete scenarios
+
+When domain relationships are being discussed, stress-test them with specific scenarios. Invent scenarios that probe edge cases and force the user to be precise about the boundaries between concepts.
+
+### Cross-reference with code
+
+When the user states how something works, check whether the code agrees. If you find a contradiction, surface it: "Your code cancels entire Orders, but you just said partial cancellation is possible. Which is right?"
+
+### Update CONTEXT.md inline
+
+When a term is resolved, update `CONTEXT.md` right there. Don't batch these up: capture them as they happen. Use the format in [CONTEXT-FORMAT.md](./CONTEXT-FORMAT.md).
+
+`CONTEXT.md` should be totally devoid of implementation details. Do not treat `CONTEXT.md` as a spec, a scratch pad, or a repository for implementation decisions. It is a glossary and nothing else.
+
+### Offer ADRs sparingly
+
+Only offer to create an ADR when all three are true:
+
+1. **Hard to reverse**: the cost of changing your mind later is meaningful
+2. **Surprising without context**: a future reader will wonder "why did they do it this way?"
+3. **The result of a real trade-off**: there were genuine alternatives and you picked one for specific reasons
+
+If any of the three is missing, skip the ADR. Use the format in [ADR-FORMAT.md](./ADR-FORMAT.md).
diff --git a/.agents/skills/domain-modeling/agents/openai.yaml b/.agents/skills/domain-modeling/agents/openai.yaml
new file mode 100644
index 00000000..7f1522d2
--- /dev/null
+++ b/.agents/skills/domain-modeling/agents/openai.yaml
@@ -0,0 +1,3 @@
+interface:
+  display_name: "Domain Modeling"
+  short_description: "Build and sharpen a domain model"
diff --git a/.agents/skills/git-guardrails-claude-code/SKILL.md b/.agents/skills/git-guardrails-claude-code/SKILL.md
new file mode 100644
index 00000000..58bcdd87
--- /dev/null
+++ b/.agents/skills/git-guardrails-claude-code/SKILL.md
@@ -0,0 +1,95 @@
+---
+name: git-guardrails-claude-code
+description: Set up Claude Code hooks to block dangerous git commands (push, reset --hard, clean, branch -D, etc.) before they execute. Use when user wants to prevent destructive git operations, add git safety hooks, or block git push/reset in Claude Code.
+---
+
+# Setup Git Guardrails
+
+Sets up a PreToolUse hook that intercepts and blocks dangerous git commands before Claude executes them.
+
+## What Gets Blocked
+
+- `git push` (all variants including `--force`)
+- `git reset --hard`
+- `git clean -f` / `git clean -fd`
+- `git branch -D`
+- `git checkout .` / `git restore .`
+
+When blocked, Claude sees a message telling it that it does not have authority to access these commands.
+
+## Steps
+
+### 1. Ask scope
+
+Ask the user: install for **this project only** (`.claude/settings.json`) or **all projects** (`~/.claude/settings.json`)?
+
+### 2. Copy the hook script
+
+The bundled script is at: [scripts/block-dangerous-git.sh](scripts/block-dangerous-git.sh)
+
+Copy it to the target location based on scope:
+
+- **Project**: `.claude/hooks/block-dangerous-git.sh`
+- **Global**: `~/.claude/hooks/block-dangerous-git.sh`
+
+Make it executable with `chmod +x`.
+
+### 3. Add hook to settings
+
+Add to the appropriate settings file:
+
+**Project** (`.claude/settings.json`):
+
+```json
+{
+  "hooks": {
+    "PreToolUse": [
+      {
+        "matcher": "Bash",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "\"$CLAUDE_PROJECT_DIR\"/.claude/hooks/block-dangerous-git.sh"
+          }
+        ]
+      }
+    ]
+  }
+}
+```
+
+**Global** (`~/.claude/settings.json`):
+
+```json
+{
+  "hooks": {
+    "PreToolUse": [
+      {
+        "matcher": "Bash",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "~/.claude/hooks/block-dangerous-git.sh"
+          }
+        ]
+      }
+    ]
+  }
+}
+```
+
+If the settings file already exists, merge the hook into the existing `hooks.PreToolUse` array. Don't overwrite other settings.
+
+### 4. Ask about customization
+
+Ask if user wants to add or remove any patterns from the blocked list. Edit the copied script accordingly.
+
+### 5. Verify
+
+Run a quick test:
+
+```bash
+echo '{"tool_input":{"command":"git push origin main"}}' | <path-to-script>
+```
+
+Should exit with code 2 and print a BLOCKED message to stderr.
diff --git a/.agents/skills/git-guardrails-claude-code/agents/openai.yaml b/.agents/skills/git-guardrails-claude-code/agents/openai.yaml
new file mode 100644
index 00000000..3f5d756f
--- /dev/null
+++ b/.agents/skills/git-guardrails-claude-code/agents/openai.yaml
@@ -0,0 +1,3 @@
+interface:
+  display_name: "Git Guardrails for Claude Code"
+  short_description: "Block dangerous git commands"
diff --git a/.agents/skills/git-guardrails-claude-code/scripts/block-dangerous-git.sh b/.agents/skills/git-guardrails-claude-code/scripts/block-dangerous-git.sh
new file mode 100755
index 00000000..c40b59cb
--- /dev/null
+++ b/.agents/skills/git-guardrails-claude-code/scripts/block-dangerous-git.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+
+INPUT=$(cat)
+COMMAND=$(echo "$INPUT" | jq -r '.tool_input.command')
+
+DANGEROUS_PATTERNS=(
+  "git push"
+  "git reset --hard"
+  "git clean -fd"
+  "git clean -f"
+  "git branch -D"
+  "git checkout \."
+  "git restore \."
+  "push --force"
+  "reset --hard"
+)
+
+for pattern in "${DANGEROUS_PATTERNS[@]}"; do
+  if echo "$COMMAND" | grep -qE "$pattern"; then
+    echo "BLOCKED: '$COMMAND' matches dangerous pattern '$pattern'. The user has prevented you from doing this." >&2
+    exit 2
+  fi
+done
+
+exit 0
diff --git a/.agents/skills/grill-me/SKILL.md b/.agents/skills/grill-me/SKILL.md
new file mode 100644
index 00000000..3947ff9c
--- /dev/null
+++ b/.agents/skills/grill-me/SKILL.md
@@ -0,0 +1,7 @@
+---
+name: grill-me
+description: A relentless interview to sharpen a plan or design.
+disable-model-invocation: true
+---
+
+Call the Skill tool with "grilling".
diff --git a/.agents/skills/grill-me/agents/openai.yaml b/.agents/skills/grill-me/agents/openai.yaml
new file mode 100644
index 00000000..4d6fb0c7
--- /dev/null
+++ b/.agents/skills/grill-me/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Grill Me"
+  short_description: "Sharpen a plan through interview"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/grill-with-docs/SKILL.md b/.agents/skills/grill-with-docs/SKILL.md
new file mode 100644
index 00000000..f33c7b19
--- /dev/null
+++ b/.agents/skills/grill-with-docs/SKILL.md
@@ -0,0 +1,11 @@
+---
+name: grill-with-docs
+description: Sharpen a plan or design through a relentless interview while creating ADRs, a glossary, and useful Mermaid diagrams.
+disable-model-invocation: true
+---
+
+Call the Skill tool twice, for "grilling" and "domain-modeling".
+
+When relationships, flows, states, sequences, or the emerging design tree are easier to understand visually, propose a Mermaid diagram. Generate it only from decisions already settled with the user, place it in the most relevant Markdown document, and update it as later answers change the design. Choose the Mermaid diagram type that best expresses the information; keep labels in the project's canonical domain language.
+
+Before finishing, verify every Mermaid block is syntactically valid and consistent with the glossary and ADRs.
diff --git a/.agents/skills/grill-with-docs/agents/openai.yaml b/.agents/skills/grill-with-docs/agents/openai.yaml
new file mode 100644
index 00000000..5dbe2780
--- /dev/null
+++ b/.agents/skills/grill-with-docs/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Grill with Docs"
+  short_description: "Grill a design and write its docs"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/grilling/SKILL.md b/.agents/skills/grilling/SKILL.md
new file mode 100644
index 00000000..8ca78c6d
--- /dev/null
+++ b/.agents/skills/grilling/SKILL.md
@@ -0,0 +1,28 @@
+---
+name: grilling
+description: Grill the user relentlessly about a plan, decision, or idea. Use when the user wants to stress-test their thinking, or uses any 'grill' trigger phrases.
+---
+
+Interview the user relentlessly until you reach a shared understanding. Map this as a **design tree**: every decision branches into the decisions that hang off it.
+
+Work the tree in **rounds**. The **frontier** is every decision whose prerequisites are already settled: the questions you can ask _now_ without guessing at answers you haven't heard yet. Ask the whole frontier in one round: number each question and give your recommended answer. Then wait for the user's answers before the next round.
+
+Format a round like so:
+
+```
+❓ **Q1** - **<question title>**: <question body, might be multiple paragraphs, including multiple choices>
+
+➡️ <your recommended answer>
+
+---
+
+❓ **Q2** - **<question title>**: <question body, might be multiple paragraphs, including multiple choices>
+
+➡️ <your recommended answer>
+```
+
+Each round the user answers reshapes the tree: settled decisions push the frontier outward and unblock questions that depended on them. Recompute the frontier and ask the next round. A question whose answer depends on another question still open in this round belongs to a _later_ round, not this one.
+
+Finding _facts_ is your job, never the user's. When a frontier question needs a fact from the environment (filesystem, tools, etc.), dispatch a sub-agent to find it; don't ask the user for anything you could look up yourself. Don't block on it: a running exploration is an unsettled prerequisite, so only the questions downstream of it wait for the sub-agent to report; ask the rest of the frontier now. The _decisions_ are the user's: put each to them and wait.
+
+The session is done when the frontier is empty: every branch of the design tree visited, nothing left silently assumed. Do not act on it until the user confirms you have reached a shared understanding.
diff --git a/.agents/skills/grilling/agents/openai.yaml b/.agents/skills/grilling/agents/openai.yaml
new file mode 100644
index 00000000..ddbdb961
--- /dev/null
+++ b/.agents/skills/grilling/agents/openai.yaml
@@ -0,0 +1,3 @@
+interface:
+  display_name: "Grilling"
+  short_description: "Stress-test thinking a round of questions at a time"
diff --git a/.agents/skills/handoff/SKILL.md b/.agents/skills/handoff/SKILL.md
new file mode 100644
index 00000000..2eb98a51
--- /dev/null
+++ b/.agents/skills/handoff/SKILL.md
@@ -0,0 +1,16 @@
+---
+name: handoff
+description: Compact the current conversation into a handoff document for another agent to pick up.
+argument-hint: "What will the next session be used for?"
+disable-model-invocation: true
+---
+
+Write a handoff document summarising the current conversation so a fresh agent can continue the work. Save to the temporary directory of the user's OS - not the current workspace.
+
+Include a "suggested skills" section in the document, naming which skills the next agent should call the Skill tool for.
+
+Do not duplicate content already captured in other artifacts (specs, plans, ADRs, issues, commits, diffs). Reference them by path or URL instead.
+
+Redact any sensitive information, such as API keys, passwords, or personally identifiable information.
+
+If the user passed arguments, treat them as a description of what the next session will focus on and tailor the doc accordingly.
diff --git a/.agents/skills/handoff/agents/openai.yaml b/.agents/skills/handoff/agents/openai.yaml
new file mode 100644
index 00000000..6e1d8da1
--- /dev/null
+++ b/.agents/skills/handoff/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Handoff"
+  short_description: "Compact a conversation into a handoff"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/implement-spec/SKILL.md b/.agents/skills/implement-spec/SKILL.md
new file mode 100644
index 00000000..d5097f84
--- /dev/null
+++ b/.agents/skills/implement-spec/SKILL.md
@@ -0,0 +1,35 @@
+---
+name: implement-spec
+description: "Implement a specification in code."
+disable-model-invocation: true
+---
+
+You have been provided a spec. This spec should have tickets associated with it, describing how to implement the spec.
+
+The goal is a PR which implements the entire spec on a single branch.
+
+The tickets are not a list of steps. They are a **task graph** with blocking relationships between them. This means there is always a **frontier** of tickets which are ready to be grabbed.
+
+Communication to and from subagents should be sparse. Communicate primarily through **context pointers**: to the spec, tickets, research notes, and previous commits. Don't duplicate information already available via pointers.
+
+**Implementer subagents** should be run in the background where possible for **maximum concurrency**.
+
+## Steps
+
+1. Read the spec and tickets. Read enough to understand the task graph.
+
+2. (optional) Use an **exploration subagent** to conduct any exploration required by the tickets - relevant codebase files or external documentation. Ensure the exploration subagent can save files - it should save its markdown notes in a directory outside the repo, accessible by all future subagents. This lets **implementer subagents** focus on implementation rather than exploration.
+
+3. Create a branch, and a draft PR. The PR should be marked as 'closing' the spec issue and tickets.
+
+4. Use **implementer subagents** to implement each ticket. Each implementer subagent should work in its own worktree, on its own branch.
+
+5. Once an **implementer subagent** completes, merge its work to the PR branch with a **merger subagent**.
+
+6. If this changes the **frontier** of available tickets, kick off more **implementer subagents** to work on the new tickets. This allows for maximum concurrency.
+
+7. Once all tickets are complete, run /code-review on the PR branch. Fix all issues raised by the code review in a single **implementer subagent**.
+
+8. Mark the PR as ready for review.
+
+9. Clean up all **implementer subagent** worktrees.
diff --git a/.agents/skills/implement-spec/agents/openai.yaml b/.agents/skills/implement-spec/agents/openai.yaml
new file mode 100644
index 00000000..043f27f4
--- /dev/null
+++ b/.agents/skills/implement-spec/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Implement Spec"
+  short_description: "Implement a whole spec as one PR"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/implement/SKILL.md b/.agents/skills/implement/SKILL.md
new file mode 100644
index 00000000..7a0b11f5
--- /dev/null
+++ b/.agents/skills/implement/SKILL.md
@@ -0,0 +1,15 @@
+---
+name: implement
+description: "Implement a piece of work based on a spec or set of tickets."
+disable-model-invocation: true
+---
+
+Implement the work described by the user in the spec or tickets.
+
+Use /tdd where possible, at pre-agreed seams.
+
+Run typechecking regularly, single test files regularly, and the full test suite once at the end.
+
+Once done, use /code-review to review the work.
+
+Commit your work to the current branch.
diff --git a/.agents/skills/implement/agents/openai.yaml b/.agents/skills/implement/agents/openai.yaml
new file mode 100644
index 00000000..f8794dc1
--- /dev/null
+++ b/.agents/skills/implement/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Implement"
+  short_description: "Build work from a spec or tickets"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/improve-codebase-architecture/HTML-REPORT.md b/.agents/skills/improve-codebase-architecture/HTML-REPORT.md
new file mode 100644
index 00000000..e39e8255
--- /dev/null
+++ b/.agents/skills/improve-codebase-architecture/HTML-REPORT.md
@@ -0,0 +1,123 @@
+# HTML Report Format
+
+The architectural review is rendered as a single self-contained HTML file in the OS temp directory. Tailwind and Mermaid both come from CDNs. Mermaid handles graph-shaped diagrams reliably; hand-built divs and inline SVG handle the more editorial visuals (mass diagrams, cross-sections). Mix the two: don't lean on Mermaid for everything, it'll start to look generic.
+
+## Scaffold
+
+```html
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <title>Architecture review for {{repo name}}</title>
+    <script src="https://cdn.tailwindcss.com"></script>
+    <script type="module">
+      import mermaid from "https://cdn.jsdelivr.net/npm/mermaid@11/dist/mermaid.esm.min.mjs";
+      mermaid.initialize({ startOnLoad: true, theme: "neutral", securityLevel: "loose" });
+    </script>
+    <style>
+      /* small custom layer for things Tailwind doesn't cover cleanly:
+         dashed seam lines, hand-drawn-feeling arrow heads, etc. */
+      .seam { stroke-dasharray: 4 4; }
+      .leak { stroke: #dc2626; }
+      .deep { background: linear-gradient(135deg, #0f172a, #1e293b); }
+    </style>
+  </head>
+  <body class="bg-stone-50 text-slate-900 font-sans">
+    <main class="max-w-5xl mx-auto px-6 py-12 space-y-12">
+      <header>...</header>
+      <section id="candidates" class="space-y-10">...</section>
+      <section id="top-recommendation">...</section>
+    </main>
+  </body>
+</html>
+```
+
+## Header
+
+Repo name, date, and a compact legend: solid box = module, dashed line = seam, red arrow = leakage, thick dark box = deep module. No introduction paragraph. Straight into the candidates.
+
+## Candidate card
+
+The diagrams carry the weight. Prose is sparse, plain, and uses the glossary terms (from the `/codebase-design` skill) without ceremony.
+
+Each candidate is one `<article>`:
+
+- **Title**: short, names the deepening (e.g. "Collapse the Order intake pipeline").
+- **Badge row**: recommendation strength (`Strong` = emerald, `Worth exploring` = amber, `Speculative` = slate), plus a tag for the dependency category (`in-process`, `local-substitutable`, `ports & adapters`, `mock`).
+- **Files**: monospaced list, `font-mono text-sm`.
+- **Before / After diagram**: the centrepiece. Two columns, side by side. See patterns below.
+- **Problem**: one sentence. What hurts.
+- **Solution**: one sentence. What changes.
+- **Wins**: bullets, ≤6 words each. e.g. "Tests hit one interface", "Pricing logic stops leaking", "Delete 4 shallow wrappers".
+- **ADR callout** (if applicable): one line in an amber-tinted box.
+
+No paragraphs of explanation. If the diagram needs a paragraph to be understood, redraw the diagram.
+
+## Diagram patterns
+
+Pick the pattern that fits the candidate. Mix them. Don't make every diagram look the same. Variety is part of the point.
+
+### Mermaid graph (the workhorse for dependencies / call flow)
+
+Use a Mermaid `flowchart` or `graph` when the point is "X calls Y calls Z, and look at the mess." Wrap it in a Tailwind-styled card so it doesn't feel parachuted in. Style with classDef to colour leakage edges red and the deep module dark. Sequence diagrams work well for "before: 6 round-trips; after: 1."
+
+```html
+<div class="rounded-lg border border-slate-200 bg-white p-4">
+  <pre class="mermaid">
+    flowchart LR
+      A[OrderHandler] --> B[OrderValidator]
+      B --> C[OrderRepo]
+      C -.leak.-> D[PricingClient]
+      classDef leak stroke:#dc2626,stroke-width:2px;
+      class C,D leak
+  </pre>
+</div>
+```
+
+### Hand-built boxes-and-arrows (when Mermaid's layout fights you)
+
+Modules as `<div>`s with borders and labels. Arrows as inline SVG `<line>` or `<path>` elements positioned absolutely over a relative container. Reach for this when you want the "after" diagram to feel like one thick-bordered deep module with greyed-out internals, since Mermaid won't render that with the right weight.
+
+### Cross-section (good for layered shallowness)
+
+Stack horizontal bands (`h-12 border-l-4`) to show layers a call passes through. Before: 6 thin layers each doing nothing. After: 1 thick band labelled with the consolidated responsibility.
+
+### Mass diagram (good for "interface as wide as implementation")
+
+Two rectangles per module: one for interface surface area, one for implementation. Before: interface rectangle is nearly as tall as the implementation rectangle (shallow). After: interface rectangle is short, implementation rectangle is tall (deep).
+
+### Call-graph collapse
+
+Before: a tree of function calls rendered as nested boxes. After: the same tree collapsed into one box, with the now-internal calls shown faded inside it.
+
+## Style guidance
+
+- Lean editorial, not corporate-dashboard. Generous whitespace. Serif optional for headings (`font-serif` works well with stone/slate).
+- Colour sparingly: one accent (emerald or indigo) plus red for leakage and amber for warnings.
+- Keep diagrams ~320px tall so before/after sits comfortably side by side without scrolling.
+- Use `text-xs uppercase tracking-wider` for module labels inside diagrams, so they read as schematic, not as UI.
+- The only scripts are the Tailwind CDN and the Mermaid ESM import. The report is otherwise static: no app code, no interactivity beyond Mermaid's own rendering.
+
+## Top recommendation section
+
+One larger card. Candidate name, one sentence on why, anchor link to its card. That's it.
+
+## Tone
+
+Plain English, concise, but the architectural nouns and verbs come straight from the `/codebase-design` skill. Concision is not an excuse to drift.
+
+**Use exactly:** module, interface, implementation, depth, deep, shallow, seam, adapter, leverage, locality.
+
+**Never substitute:** component, service, unit (for module) · API, signature (for interface) · boundary (for seam) · layer, wrapper (for module, when you mean module).
+
+**Phrasings that fit the style:**
+
+- "Order intake module is shallow: interface nearly matches the implementation."
+- "Pricing leaks across the seam."
+- "Deepen: one interface, one place to test."
+- "Two adapters justify the seam: HTTP in prod, in-memory in tests."
+
+**Wins bullets** name the gain in glossary terms: *"locality: bugs concentrate in one module"*, *"leverage: one interface, N call sites"*, *"interface shrinks; implementation absorbs the wrappers"*. Don't write *"easier to maintain"* or *"cleaner code"*, because those terms aren't in the glossary and don't earn their place.
+
+No hedging, no throat-clearing, no "it's worth noting that…". If a sentence could be a bullet, make it a bullet. If a bullet could be cut, cut it. If a term isn't in the `/codebase-design` glossary, reach for one that is before inventing a new one.
diff --git a/.agents/skills/improve-codebase-architecture/SKILL.md b/.agents/skills/improve-codebase-architecture/SKILL.md
new file mode 100644
index 00000000..a578dd0a
--- /dev/null
+++ b/.agents/skills/improve-codebase-architecture/SKILL.md
@@ -0,0 +1,71 @@
+---
+name: improve-codebase-architecture
+description: Scan a codebase for deepening opportunities, present them as a visual HTML report, then grill through whichever one you pick.
+disable-model-invocation: true
+---
+
+# Improve Codebase Architecture
+
+Surface architectural friction and propose **deepening opportunities**: refactors that turn shallow modules into deep ones. The aim is testability and AI-navigability.
+
+This command is _informed_ by the project's domain model and built on a shared design vocabulary:
+
+- Call the Skill tool with "codebase-design" for the architecture vocabulary (**module**, **interface**, **depth**, **seam**, **adapter**, **leverage**, **locality**) and its principles (the deletion test, "the interface is the test surface", "one adapter = hypothetical seam, two = real"). Use these terms exactly in every suggestion, and don't drift into "component," "service," "API," or "boundary."
+- The domain language in `CONTEXT.md` gives names to good seams; ADRs in `docs/adr/` record decisions this command should not re-litigate.
+
+## Process
+
+### 1. Explore
+
+**Scope before you scan: YAGNI.** Deepening a module pays off by making future changes to it easier, so put extra weight on the parts of the codebase that have recently changed. Decide *where* to look before you look:
+
+- If the user named a direction (a module, a subsystem, a pain point), take it, and skip the inference below.
+- Otherwise, walk back a good stretch of the commit history (`git log --oneline`) to find the codebase's hot spots, the files and areas that keep coming up, and let those paths pull your attention first. If the changes are scattered with no clear hot spot, widen the net.
+
+Read the project's domain glossary (`CONTEXT.md`) and any ADRs in the area you're touching first.
+
+Then spawn a sub-agent to walk the codebase. Don't follow rigid heuristics; explore organically and note where you experience friction:
+
+- Where does understanding one concept require bouncing between many small modules?
+- Where are modules **shallow**, with an interface nearly as complex as the implementation?
+- Where have pure functions been extracted just for testability, but the real bugs hide in how they're called (no **locality**)?
+- Where do tightly-coupled modules leak across their seams?
+- Which parts of the codebase are untested, or hard to test through their current interface?
+
+Apply the **deletion test** to anything you suspect is shallow: would deleting it concentrate complexity, or just move it? A "yes, concentrates" is the signal you want.
+
+### 2. Present candidates as an HTML report
+
+Write a self-contained HTML file to the OS temp directory so nothing lands in the repo. Resolve the temp dir from `$TMPDIR`, falling back to `/tmp` (or `%TEMP%` on Windows), and write to `<tmpdir>/architecture-review-<timestamp>.html` so each run gets a fresh file. Open it for the user (`xdg-open <path>` on Linux, `open <path>` on macOS, `start <path>` on Windows) and tell them the absolute path.
+
+The report uses **Tailwind via CDN** for layout and styling, and **Mermaid via CDN** for diagrams where a graph/flow/sequence reliably communicates the structure. Mix Mermaid with hand-crafted CSS/SVG visuals: use Mermaid when relationships are graph-shaped (call graphs, dependencies, sequences), and hand-built divs/SVG when you want something more editorial (mass diagrams, cross-sections, collapse animations). Each candidate gets a **before/after visualisation**. Be visual.
+
+For each candidate, render a card with:
+
+- **Files**: which files/modules are involved
+- **Problem**: why the current architecture is causing friction
+- **Solution**: plain English description of what would change
+- **Benefits**: explained in terms of locality and leverage, and how tests would improve
+- **Before / After diagram**: side-by-side, custom-drawn, illustrating the shallowness and the deepening
+- **Recommendation strength**: one of `Strong`, `Worth exploring`, `Speculative`, rendered as a badge
+
+End the report with a **Top recommendation** section: which candidate you'd tackle first and why.
+
+**Use CONTEXT.md vocabulary for the domain, and the `/codebase-design` vocabulary for the architecture.** If `CONTEXT.md` defines "Order," talk about "the Order intake module," not "the FooBarHandler," and not "the Order service."
+
+**ADR conflicts**: if a candidate contradicts an existing ADR, only surface it when the friction is real enough to warrant revisiting the ADR. Mark it clearly in the card (e.g. a warning callout: _"contradicts ADR-0007, but worth reopening because…"_). Don't list every theoretical refactor an ADR forbids.
+
+See [HTML-REPORT.md](HTML-REPORT.md) for the full HTML scaffold, diagram patterns, and styling guidance.
+
+Do NOT propose interfaces yet. After the file is written, ask the user: "Which of these would you like to explore?"
+
+### 3. Grilling loop
+
+Once the user picks a candidate, call the Skill tool with "grilling" to walk the decision tree with them: constraints, dependencies, the shape of the deepened module, what sits behind the seam, what tests survive.
+
+Side effects happen inline as decisions crystallize; call the Skill tool with "domain-modeling" to keep the domain model current as you go:
+
+- **Naming a deepened module after a concept not in `CONTEXT.md`?** Add the term to `CONTEXT.md`. Create the file lazily if it doesn't exist.
+- **Sharpening a fuzzy term during the conversation?** Update `CONTEXT.md` right there.
+- **User rejects the candidate with a load-bearing reason?** Offer an ADR, framed as: _"Want me to record this as an ADR so future architecture reviews don't re-suggest it?"_ Only offer when the reason would actually be needed by a future explorer to avoid re-suggesting the same thing; skip ephemeral reasons ("not worth it right now") and self-evident ones.
+- **Want to explore alternative interfaces for the deepened module?** Call the Skill tool with "codebase-design" and use its design-it-twice parallel sub-agent pattern.
diff --git a/.agents/skills/improve-codebase-architecture/agents/openai.yaml b/.agents/skills/improve-codebase-architecture/agents/openai.yaml
new file mode 100644
index 00000000..706fdca0
--- /dev/null
+++ b/.agents/skills/improve-codebase-architecture/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Improve Codebase Architecture"
+  short_description: "Find and grill architecture improvements"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/loop-me/SKILL.md b/.agents/skills/loop-me/SKILL.md
new file mode 100644
index 00000000..e58a474c
--- /dev/null
+++ b/.agents/skills/loop-me/SKILL.md
@@ -0,0 +1,32 @@
+---
+name: loop-me
+description: Grill me about specs for the workflows I want to build, within this workspace.
+disable-model-invocation: true
+argument-hint: "A workflow to design, or nothing to go find one"
+---
+
+Run a stateful `/grilling` session whose only output is **workflow** specs. Use the grilling discipline (relentless, a round of questions at a time, a recommended answer attached to each) aimed at the vocabulary and goal below. Create, edit, and delete specs as the grilling resolves things.
+
+## The loop lens
+
+A **loop** is a recurring pattern in the user's life: their career, their week, their morning, a single repeated activity. Picturing a life as loops within loops reveals how predictable its activities really are, which is what makes them worth **delegating**. Use the lens to find loops worth specifying, and propose ones the user hasn't noticed.
+
+A **workflow** is the spec of one loop, made real. You run a workflow on a loop: the loop is its running instantiation. Workflows live in `workflows/*.md` and are the source of truth.
+
+## Vocabulary
+
+A shared language, reached for only when a workflow calls for it: never a checklist. **Mandate nothing structural**: a workflow needs no AI, no checkpoint, and no schedule unless the grilling shows it does.
+
+- **Trigger**: what fires each run, an **event** (a new email, a new issue) or a **schedule** (every morning). Event-triggering is usually the more efficient.
+- **Checkpoint**: a human-in-the-loop point where the user is asked to verify or decide. Some workflows have none and run autonomously; some use no AI at all.
+- **Push right**: defer the checkpoint as far as it will go. Do maximal work before involving the human, so they are asked once, late, with everything prepared.
+- **Brief**: what a checkpoint presents, a tight, decision-ready summary (what was produced, why, and a link down to the asset itself), never the raw output. The user reads a brief, not a draft. Speed of review is imperative.
+
+## Definition of done
+
+A workflow spec is done when an implementer agent could build it without asking a single question. Grill until then; nothing is done while a question remains.
+
+## The workspace
+
+- `workflows/*.md`: one spec per workflow.
+- `NOTES.md`: raw notes on the user's world, the tools they use, the channels they process, and their own terminology for both. When it is empty or thin, interview them about their world before specifying anything. Sharpen fuzzy terms into canonical ones as they surface, and record them here.
diff --git a/.agents/skills/loop-me/agents/openai.yaml b/.agents/skills/loop-me/agents/openai.yaml
new file mode 100644
index 00000000..1a4f4111
--- /dev/null
+++ b/.agents/skills/loop-me/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Loop Me"
+  short_description: "Spec the workflows you want to build"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/migrate-to-shoehorn/SKILL.md b/.agents/skills/migrate-to-shoehorn/SKILL.md
new file mode 100644
index 00000000..ae4f965e
--- /dev/null
+++ b/.agents/skills/migrate-to-shoehorn/SKILL.md
@@ -0,0 +1,118 @@
+---
+name: migrate-to-shoehorn
+description: Migrate test files from `as` type assertions to @total-typescript/shoehorn. Use when user mentions shoehorn, wants to replace `as` in tests, or needs partial test data.
+---
+
+# Migrate to Shoehorn
+
+## Why shoehorn?
+
+`shoehorn` lets you pass partial data in tests while keeping TypeScript happy. It replaces `as` assertions with type-safe alternatives.
+
+**Test code only.** Never use shoehorn in production code.
+
+Problems with `as` in tests:
+
+- Trained not to use it
+- Must manually specify target type
+- Double-as (`as unknown as Type`) for intentionally wrong data
+
+## Install
+
+```bash
+npm i @total-typescript/shoehorn
+```
+
+## Migration patterns
+
+### Large objects with few needed properties
+
+Before:
+
+```ts
+type Request = {
+  body: { id: string };
+  headers: Record<string, string>;
+  cookies: Record<string, string>;
+  // ...20 more properties
+};
+
+it("gets user by id", () => {
+  // Only care about body.id but must fake entire Request
+  getUser({
+    body: { id: "123" },
+    headers: {},
+    cookies: {},
+    // ...fake all 20 properties
+  });
+});
+```
+
+After:
+
+```ts
+import { fromPartial } from "@total-typescript/shoehorn";
+
+it("gets user by id", () => {
+  getUser(
+    fromPartial({
+      body: { id: "123" },
+    }),
+  );
+});
+```
+
+### `as Type` → `fromPartial()`
+
+Before:
+
+```ts
+getUser({ body: { id: "123" } } as Request);
+```
+
+After:
+
+```ts
+import { fromPartial } from "@total-typescript/shoehorn";
+
+getUser(fromPartial({ body: { id: "123" } }));
+```
+
+### `as unknown as Type` → `fromAny()`
+
+Before:
+
+```ts
+getUser({ body: { id: 123 } } as unknown as Request); // wrong type on purpose
+```
+
+After:
+
+```ts
+import { fromAny } from "@total-typescript/shoehorn";
+
+getUser(fromAny({ body: { id: 123 } }));
+```
+
+## When to use each
+
+| Function        | Use case                                           |
+| --------------- | -------------------------------------------------- |
+| `fromPartial()` | Pass partial data that still type-checks           |
+| `fromAny()`     | Pass intentionally wrong data (keeps autocomplete) |
+| `fromExact()`   | Force full object (swap with fromPartial later)    |
+
+## Workflow
+
+1. **Gather requirements** - ask user:
+   - What test files have `as` assertions causing problems?
+   - Are they dealing with large objects where only some properties matter?
+   - Do they need to pass intentionally wrong data for error testing?
+
+2. **Install and migrate**:
+   - [ ] Install: `npm i @total-typescript/shoehorn`
+   - [ ] Find test files with `as` assertions: `grep -r " as [A-Z]" --include="*.test.ts" --include="*.spec.ts"`
+   - [ ] Replace `as Type` with `fromPartial()`
+   - [ ] Replace `as unknown as Type` with `fromAny()`
+   - [ ] Add imports from `@total-typescript/shoehorn`
+   - [ ] Run type check to verify
diff --git a/.agents/skills/migrate-to-shoehorn/agents/openai.yaml b/.agents/skills/migrate-to-shoehorn/agents/openai.yaml
new file mode 100644
index 00000000..3bd79ee2
--- /dev/null
+++ b/.agents/skills/migrate-to-shoehorn/agents/openai.yaml
@@ -0,0 +1,3 @@
+interface:
+  display_name: "Migrate to Shoehorn"
+  short_description: "Replace test assertions with shoehorn"
diff --git a/.agents/skills/prototype/LOGIC.md b/.agents/skills/prototype/LOGIC.md
new file mode 100644
index 00000000..32be86a0
--- /dev/null
+++ b/.agents/skills/prototype/LOGIC.md
@@ -0,0 +1,67 @@
+# Logic Prototype
+
+A single, self-contained HTML file (a **shareable demo**) that lets anyone drive a state model by clicking buttons. Use this when the question is about **business logic, state transitions, or data shape**: the kind of thing that looks reasonable on paper but only feels wrong once you push it through real cases.
+
+Because it's one file with nothing to install, you can hand it to a non-developer (a designer, a PM, a domain expert) and let them feel the model for themselves. So it speaks their language, not the code's.
+
+## When this is the right shape
+
+- "I'm not sure if this state machine handles the edge case where X then Y."
+- "Does this data model actually let me represent the case where..."
+- "I want to feel out what the API should look like before writing it."
+- Anything where someone wants to **press buttons and watch state change**.
+
+If the question is "what should this look like," this is the wrong branch. Use [UI.md](UI.md).
+
+## Process
+
+### 1. State the question
+
+Before writing code, write down what state model and what question you're prototyping. One paragraph, at the top of the demo (in a visible intro, not just a comment). A logic prototype that answers the wrong question is pure waste, so make the question explicit so it can be checked later, whether the user is watching now or returning to it AFK.
+
+### 2. Isolate the logic in a portable module
+
+Put the actual logic (the bit that's answering the question) in a single `<script>` block written as a small, pure module that could be lifted out and dropped into the real codebase later. The page around it is throwaway; this module isn't.
+
+The right shape depends on the question:
+
+- **A pure reducer**: `(state, action) => state`. Good when actions are discrete events and state is a single value.
+- **A state machine**: explicit states and transitions. Good when "which actions are even legal right now" is part of the question.
+- **A small set of pure functions** over a plain data type. Good when there's no implicit current state, just transformations.
+- **A class or module with a clear method surface** when the logic genuinely owns ongoing internal state.
+
+Pick whichever shape best fits the question being asked, *not* whichever is easiest to wire to a page. Keep it pure: no DOM, no `document`, no button handlers reaching inside it. The page calls into it; nothing flows the other direction. This is what makes the prototype useful past its own lifetime: once the question's answered, the validated reducer / machine / function set lifts into the real module on its own.
+
+### 3. Build the shareable HTML file
+
+One file, plain HTML/CSS/JS: no framework, no bundler, no server, everything inline so it opens by double-click and survives being emailed around. Anyone should be able to run it by opening it.
+
+Write it for a non-developer. Every label is in **domain language**, not code: buttons and state read like the business, not the reducer. Explain in plain words what's happening.
+
+Lay it out with a clean hierarchy, top to bottom:
+
+1. **Title and one-line explanation** of what this demo lets you explore (the question from step 1).
+2. **Current state**: the full relevant state, rendered as a readable panel (labelled fields, not a raw JSON dump), re-rendered after every click so the change is visible. Where it helps a non-developer follow, call out what just changed.
+3. **Free-play buttons**: one button per action, always available, so anyone can poke at the model in any order. Each click dispatches its action and re-renders the state.
+4. **Guided walkthroughs**: a set of **scenarios**, one per tab. Each tab holds a short plain-language description of the scenario (the situation it sets up and what to watch for) and underneath it, the ordered **buttons to press** for that scenario. Each step is a real button: clicking it performs that action and moves to the next step. Starting a walkthrough resets to a known initial state so the scenario runs the same way every time.
+
+Choose scenarios that demonstrate the awkward cases, the ones hard to reason about on paper: the happy path, a tricky edge case, an attempt at something that should be illegal.
+
+Keep it beautiful but restrained: clean typography, generous spacing, one accent colour. No animations, no gimmicks: nothing that competes with the state and the buttons.
+
+### 4. Hand it over
+
+Send them the file, or open it for them. They'll click through the walkthroughs and free-play whenever they get to it; the interesting moments are when they say "wait, that shouldn't be possible" or "huh, I assumed X would be different"; those are the bugs in the _idea_, which is the whole point. If they want new actions or a new scenario, add them. Prototypes evolve.
+
+### 5. Capture the answer and the prototype
+
+Once the prototype has answered its question, capture the answer, then capture the prototype the way the [SKILL](SKILL.md) describes. The logic-specific mapping: the validated reducer / machine / function set lifts into the real module (the decision, absorbed); the HTML shell rides along to the throwaway branch that keeps the prototype as a primary source, and being one self-contained file, it stays trivially re-runnable there.
+
+## Anti-patterns
+
+- **Don't add tests.** A prototype that needs tests is no longer a prototype.
+- **Don't wire it to the real database.** Use in-memory state unless the question is specifically about persistence.
+- **Don't generalise.** No "what if we wanted to support X later." The prototype answers one question.
+- **Don't blur the logic and the page together.** If the pure module references the DOM, `document`, or button handlers, it's no longer liftable. Keep the page as a thin shell over a pure module.
+- **Don't reach for a framework, bundler, or server.** One file the recipient double-clicks; a React app or a dev server defeats "shareable".
+- **Don't ship the HTML shell into production.** The page is optimised for being clicked through by hand. The logic module behind it is the bit worth keeping.
diff --git a/.agents/skills/prototype/SKILL.md b/.agents/skills/prototype/SKILL.md
new file mode 100644
index 00000000..a0044501
--- /dev/null
+++ b/.agents/skills/prototype/SKILL.md
@@ -0,0 +1,26 @@
+---
+name: prototype
+description: Build a throwaway prototype to answer a design question. Use when the user wants to sanity-check whether a state model or logic feels right, or explore what a UI should look like.
+---
+
+# Prototype
+
+A prototype is **throwaway code that answers a question**. The question decides the shape.
+
+## Pick a branch
+
+Identify which question is being answered, using the user's prompt, the surrounding code, or by asking if the user is around:
+
+- **"Does this logic / state model feel right?"** → [LOGIC.md](LOGIC.md). Build a single shareable HTML file (free-play buttons plus tabbed guided walkthroughs) that pushes the state machine through cases that are hard to reason about on paper, and that a non-developer can drive.
+- **"What should this look like?"** → [UI.md](UI.md). Generate several radically different UI variations on a single route, switchable via a URL search param and a floating bottom bar.
+
+The two branches produce very different artifacts, so getting this wrong wastes the whole prototype. If the question is genuinely ambiguous and the user isn't reachable, default to whichever branch better matches the surrounding code (a backend module → logic; a page or component → UI) and state the assumption at the top of the prototype.
+
+## Rules that apply to both
+
+1. **Throwaway from day one, and clearly marked as such.** Locate the prototype code close to where it will actually be used (next to the module or page it's prototyping for) so context is obvious, but name it so a casual reader can see it's a prototype, not production. For throwaway UI routes, obey whatever routing convention the project already uses; don't invent a new top-level structure.
+2. **Trivial to run.** A UI prototype starts from one command in the project's task runner: `pnpm <name>`, `python <path>`, `bun <path>`, etc. A logic demo is a single HTML file the user double-clicks. Either way, no thinking required to start it.
+3. **No persistence by default.** State lives in memory. Persistence is the thing the prototype is _checking_, not something it should depend on. If the question explicitly involves a database, hit a scratch DB or a local file with a clear "PROTOTYPE, wipe me" name.
+4. **Skip the polish.** No tests, no error handling beyond what makes the prototype _runnable_, no abstractions. The point is to learn something fast.
+5. **Surface the state.** After every action (logic) or on every variant switch (UI), print or render the full relevant state so the user can see what changed.
+6. **Capture it when done.** Fold any validated decision into the real code, then capture the prototype itself as a **primary source**: commit it to a throwaway branch, out of main, and leave a context pointer to that branch on the implementation issue. Capture the answer too (the verdict and the question it settled) in the issue or a commit. The main branch keeps only the validated decision.
diff --git a/.agents/skills/prototype/UI.md b/.agents/skills/prototype/UI.md
new file mode 100644
index 00000000..39779516
--- /dev/null
+++ b/.agents/skills/prototype/UI.md
@@ -0,0 +1,112 @@
+# UI Prototype
+
+Generate **several radically different UI variations** on a single route, switchable from a floating bottom bar. The user flips between variants in the browser, picks one (or steals bits from each), then throws the rest away.
+
+If the question is about logic/state rather than what something looks like, this is the wrong branch. Use [LOGIC.md](LOGIC.md).
+
+## When this is the right shape
+
+- "What should this page look like?"
+- "I want to see a few options for this dashboard before committing."
+- "Try a different layout for the settings screen."
+- Any time the user would otherwise spend a day picking between three vague mockups in their head.
+
+## Two sub-shapes: strongly prefer sub-shape A
+
+A UI prototype is much easier to judge when it's **butting up against the rest of the app**: real header, real sidebar, real data, real density. A throwaway route on its own is a vacuum: every variant looks fine in isolation. Default to sub-shape A whenever there's a plausible existing page to host the variants. Only reach for sub-shape B if the prototype genuinely has no nearby home.
+
+### Sub-shape A: adjustment to an existing page (preferred)
+
+The route already exists. Variants are rendered **on the same route**, gated by a `?variant=` URL search param. The existing data fetching, params, and auth all stay. Only the rendering swaps. This is the default; pick it unless there's a specific reason not to.
+
+If the prototype is for something that doesn't yet have a page but *would naturally live inside one* (a new section of the dashboard, a new card on the settings screen, a new step in an existing flow), it's still sub-shape A. Mount the variants inside the host page.
+
+### Sub-shape B: a new page (last resort)
+
+Only use this when the thing being prototyped genuinely has no existing page to live inside (e.g. an entirely new top-level surface, or a flow that can't be embedded anywhere sensible).
+
+Create a **throwaway route** following whatever routing convention the project already uses. Don't invent a new top-level structure. Name it so it's obviously a prototype (e.g. include the word `prototype` in the path or filename). Same `?variant=` pattern.
+
+Before committing to sub-shape B, sanity-check: is there really no existing page this could be embedded in? An empty route hides design problems that a populated one would expose.
+
+In both sub-shapes the floating bottom bar is identical.
+
+## Process
+
+### 1. State the question and pick N
+
+Default to **3 variants**. More than 5 stops being radically different and starts being noise, so cap there.
+
+Write down the plan in one line, in the prototype's location or a top-of-file comment:
+
+> "Three variants of the settings page, switchable via `?variant=`, on the existing `/settings` route."
+
+This works whether the user is here to push back or not.
+
+### 2. Generate radically different variants
+
+Draft each variant. Hold each one to:
+
+- The page's purpose and the data it has access to.
+- The project's component library / styling system (TailwindCSS, shadcn, MUI, plain CSS, whatever).
+- A clear exported component name, e.g. `VariantA`, `VariantB`, `VariantC`.
+
+Variants must be **structurally different**: different layout, different information hierarchy, different primary affordance, not just different colours. Three slightly-tweaked card grids isn't a UI prototype, it's wallpaper. If two drafts come out too similar, redo one with explicit "do not use a card grid" guidance.
+
+### 3. Wire them together
+
+Create a single switcher component on the route:
+
+```tsx
+// pseudo-code, adapt to the project's framework
+const variant = searchParams.get('variant') ?? 'A';
+return (
+  <>
+    {variant === 'A' && <VariantA {...data} />}
+    {variant === 'B' && <VariantB {...data} />}
+    {variant === 'C' && <VariantC {...data} />}
+    <PrototypeSwitcher variants={['A','B','C']} current={variant} />
+  </>
+);
+```
+
+For sub-shape A (existing page): keep all the existing data fetching above the switcher; only the rendered subtree changes per variant.
+
+For sub-shape B (new page): the throwaway route under `/prototype/<name>` mounts the same switcher.
+
+### 4. Build the floating switcher
+
+A small fixed-position bar at the bottom-centre of the screen with three pieces:
+
+- **Left arrow**: cycles to the previous variant (wraps around).
+- **Variant label**: shows the current variant key and, if the variant exports a name, that name too. e.g. `B (Sidebar layout)`.
+- **Right arrow**: cycles forward (wraps around).
+
+Behaviour:
+
+- Clicking an arrow updates the URL search param (use the framework's router, e.g. `router.replace` on Next, `navigate` on React Router, etc) so the variant is shareable and reload-stable.
+- Keyboard: `←` and `→` arrow keys also cycle. Don't intercept arrow keys when an `<input>`, `<textarea>`, or `[contenteditable]` is focused.
+- Visually distinct from the page (e.g. high-contrast pill, subtle shadow) so it's obviously not part of the design being evaluated.
+- Hidden in production builds: gate on `process.env.NODE_ENV !== 'production'` or an equivalent check, so a stray prototype merge can't ship the bar to users.
+
+Put the switcher in a single shared component so both sub-shapes can reuse it. Locate it wherever shared UI lives in the project.
+
+### 5. Hand it over
+
+Surface the URL (and the `?variant=` keys). The user will flip through whenever they get to it. The interesting feedback is usually **"I want the header from B with the sidebar from C"**, which is the actual design they want.
+
+### 6. Capture the answer and clean up
+
+Once a variant has won, capture the answer (which variant and why), then capture the prototype the way the [SKILL](SKILL.md) describes. Fold the winner into the real code and move the rest onto the throwaway branch, not into main:
+
+- **Sub-shape A**: fold the winner into the existing page; drop the losing variants and the switcher from main.
+- **Sub-shape B**: promote the winning variant to a real route; drop the throwaway route and the switcher from main.
+
+The full set of variants is the primary source, so it lands on the throwaway branch, not the bin, since variant components and the switcher left in the main branch rot fast and confuse the next reader.
+
+## Anti-patterns
+
+- **Variants that differ only in colour or copy.** That's a tweak, not a prototype. Real variants disagree about structure.
+- **Sharing too much code between variants.** A shared `<Header>` is fine; a shared `<Layout>` defeats the point. Each variant should be free to throw out the layout.
+- **Wiring variants to real mutations.** Read-only prototypes are fine. If a variant needs to mutate, point it at a stub: the question is "what should this look like", not "does the backend work".
+- **Promoting the prototype directly to production.** The variant code was written under prototype constraints (no tests, minimal error handling). Rewrite it properly when you fold it in.
diff --git a/.agents/skills/prototype/agents/openai.yaml b/.agents/skills/prototype/agents/openai.yaml
new file mode 100644
index 00000000..1618b147
--- /dev/null
+++ b/.agents/skills/prototype/agents/openai.yaml
@@ -0,0 +1,3 @@
+interface:
+  display_name: "Prototype"
+  short_description: "Prototype to answer a design question"
diff --git a/.agents/skills/research/SKILL.md b/.agents/skills/research/SKILL.md
new file mode 100644
index 00000000..fecee97e
--- /dev/null
+++ b/.agents/skills/research/SKILL.md
@@ -0,0 +1,12 @@
+---
+name: research
+description: Investigate a question against high-trust primary sources and capture the findings as a Markdown file in the repo. Use when the user wants a topic researched, docs or API facts gathered, or reading legwork delegated to a background agent.
+---
+
+Spin up a **background agent** to do the research, so you keep working while it reads.
+
+Its job:
+
+1. Investigate the question against **primary sources** (official docs, source code, specs, first-party APIs), not a secondary write-up of them. Follow every claim back to the source that owns it.
+2. Write the findings to a single Markdown file, citing each claim's source.
+3. Save it where the repo already keeps such notes; match the existing convention, and if there is none, put it somewhere sensible and say where.
diff --git a/.agents/skills/research/agents/openai.yaml b/.agents/skills/research/agents/openai.yaml
new file mode 100644
index 00000000..e18b96ca
--- /dev/null
+++ b/.agents/skills/research/agents/openai.yaml
@@ -0,0 +1,3 @@
+interface:
+  display_name: "Research"
+  short_description: "Research from high-trust sources"
diff --git a/.agents/skills/resolving-merge-conflicts/SKILL.md b/.agents/skills/resolving-merge-conflicts/SKILL.md
new file mode 100644
index 00000000..bfb7e560
--- /dev/null
+++ b/.agents/skills/resolving-merge-conflicts/SKILL.md
@@ -0,0 +1,14 @@
+---
+name: resolving-merge-conflicts
+description: "Use when you need to resolve an in-progress git merge/rebase conflict."
+---
+
+1. **See the current state** of the merge/rebase. Check git history, and the conflicting files.
+
+2. **Find the primary sources** for each conflict. Understand deeply why each change was made, and what the original intent was. Read the commit messages, check the PRs, check original issues/tickets.
+
+3. **Resolve each hunk.** Preserve both intents where possible. Where incompatible, pick the one matching the merge's stated goal and note the trade-off. Do **not** invent new behaviour. Always resolve; never `--abort`.
+
+4. Discover the project's **automated checks** and run them, typically typecheck, then tests, then format. Fix anything the merge broke.
+
+5. **Finish the merge/rebase.** Stage everything and commit. If rebasing, continue the rebase process until all commits are rebased.
diff --git a/.agents/skills/resolving-merge-conflicts/agents/openai.yaml b/.agents/skills/resolving-merge-conflicts/agents/openai.yaml
new file mode 100644
index 00000000..331ffb9d
--- /dev/null
+++ b/.agents/skills/resolving-merge-conflicts/agents/openai.yaml
@@ -0,0 +1,3 @@
+interface:
+  display_name: "Resolving Merge Conflicts"
+  short_description: "Resolve merge and rebase conflicts"
diff --git a/.agents/skills/retro/SKILL.md b/.agents/skills/retro/SKILL.md
new file mode 100644
index 00000000..f5fed82c
--- /dev/null
+++ b/.agents/skills/retro/SKILL.md
@@ -0,0 +1,44 @@
+---
+name: retro
+description: "Conduct a retrospective on a coding session."
+disable-model-invocation: true
+---
+
+The user has asked for a **retrospective**. You are suggesting improvements to the coding agent's **environment** to improve future runs.
+
+## Steps
+
+1. Call the Skill tool with `writing-for-agents` for the writing style guide.
+
+2. Read the primary sources for the session the user specifies. This may mean searching through session logs on this machine. If the user doesn't specify a session, default to the current one.
+
+3. Look for candidates for improvement in these categories.
+
+- **Navigation**: how easy was it for the agent to find the right files? Are there hidden dependencies between files? Would a **navigation pointer** make it easier? _Use when_ the session took a long time to find a piece of information.
+- **Automated checks**: are there automated checks that could catch errors the agent made? Linting, typing, tests, filesystem linters? _Use when_ the agent made a mistake that could have been caught by an automated check.
+- **Coding standards**: should the **reviewer agent** be given a new rule to enforce? Should an existing rule be removed or clarified? _Use when_ the reviewer agent failed to catch a mistake.
+- **Global AGENTS.md**: are there any steering instructions that should be moved to coding standards (or automated checks) instead? _Use when_ the AGENTS.md file is particularly large - in the repo OR the user's global scope.
+- **Tool economy**: did the agent make expensive tool calls that could be streamlined? Is there any custom tooling (CLI's, MCP's) that is particularly token-inefficient? _Use when_ the agent made an expensive tool call.
+- **No-ops**: look for instructions in steering files that don't modify the agent's behavior. _Use when_ the steering files are large and unwieldy.
+- **Information access**: look for opportunities to increase the agent's access to information. Teeing dev server logs, readonly access to third-party services. _Use when_ a crucial piece of information was not available to the agent.
+
+4. Present these candidates to the user, in order of severity.
+
+## Reference
+
+### Implementation vs Review
+
+Remember that all work goes through two stages: implementation and review. The implementation agent has the most **context pressure**. They are responsible for exploration, writing code, and debugging failures.
+
+The review agent has the least context pressure - it receives a diff, so no exploration needed. It often does not need to write code or debug.
+
+This means that the review agent should be responsible for imposing coding standards, not the implementation agent.
+
+### Files
+
+You have access to several files in the repo:
+
+- `CLAUDE.md`/`AGENTS.md`: these files are pushed to the context window of any agent working in this repo. They should be used incredibly sparingly, usually only for **navigation pointers** to other files.
+- `CODING_STANDARDS.md`: this file is read during review, not implementation. Add **navigation pointers** to docs folders if the standards file gets more than 1,000 lines long.
+- Docs: use docs as references files, pointed to by other files. Look for existing docs before writing new ones.
+- Skills: use skills for docs (since their description goes into the agent's context window), or for user-invoked commands. Follow the advice in the `writing-for-agents` skill.
diff --git a/.agents/skills/retro/agents/openai.yaml b/.agents/skills/retro/agents/openai.yaml
new file mode 100644
index 00000000..a2f0bac3
--- /dev/null
+++ b/.agents/skills/retro/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Retro"
+  short_description: "Conduct a retrospective on a coding session."
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/scaffold-exercises/SKILL.md b/.agents/skills/scaffold-exercises/SKILL.md
new file mode 100644
index 00000000..d87df28e
--- /dev/null
+++ b/.agents/skills/scaffold-exercises/SKILL.md
@@ -0,0 +1,106 @@
+---
+name: scaffold-exercises
+description: Create exercise directory structures with sections, problems, solutions, and explainers that pass linting. Use when user wants to scaffold exercises, create exercise stubs, or set up a new course section.
+---
+
+# Scaffold Exercises
+
+Create exercise directory structures that pass `pnpm ai-hero-cli internal lint`, then commit with `git commit`.
+
+## Directory naming
+
+- **Sections**: `XX-section-name/` inside `exercises/` (e.g., `01-retrieval-skill-building`)
+- **Exercises**: `XX.YY-exercise-name/` inside a section (e.g., `01.03-retrieval-with-bm25`)
+- Section number = `XX`, exercise number = `XX.YY`
+- Names are dash-case (lowercase, hyphens)
+
+## Exercise variants
+
+Each exercise needs at least one of these subfolders:
+
+- `problem/` - student workspace with TODOs
+- `solution/` - reference implementation
+- `explainer/` - conceptual material, no TODOs
+
+When stubbing, default to `explainer/` unless the plan specifies otherwise.
+
+## Required files
+
+Each subfolder (`problem/`, `solution/`, `explainer/`) needs a `readme.md` that:
+
+- Is **not empty** (must have real content, even a single title line works)
+- Has no broken links
+
+When stubbing, create a minimal readme with a title and a description:
+
+```md
+# Exercise Title
+
+Description here
+```
+
+If the subfolder has code, it also needs a `main.ts` (>1 line). But for stubs, a readme-only exercise is fine.
+
+## Workflow
+
+1. **Parse the plan** - extract section names, exercise names, and variant types
+2. **Create directories** - `mkdir -p` for each path
+3. **Create stub readmes** - one `readme.md` per variant folder with a title
+4. **Run lint** - `pnpm ai-hero-cli internal lint` to validate
+5. **Fix any errors** - iterate until lint passes
+
+## Lint rules summary
+
+The linter (`pnpm ai-hero-cli internal lint`) checks:
+
+- Each exercise has subfolders (`problem/`, `solution/`, `explainer/`)
+- At least one of `problem/`, `explainer/`, or `explainer.1/` exists
+- `readme.md` exists and is non-empty in the primary subfolder
+- No `.gitkeep` files
+- No `speaker-notes.md` files
+- No broken links in readmes
+- No `pnpm run exercise` commands in readmes
+- `main.ts` required per subfolder unless it's readme-only
+
+## Moving/renaming exercises
+
+When renumbering or moving exercises:
+
+1. Use `git mv` (not `mv`) to rename directories - preserves git history
+2. Update the numeric prefix to maintain order
+3. Re-run lint after moves
+
+Example:
+
+```bash
+git mv exercises/01-retrieval/01.03-embeddings exercises/01-retrieval/01.04-embeddings
+```
+
+## Example: stubbing from a plan
+
+Given a plan like:
+
+```
+Section 05: Memory Skill Building
+- 05.01 Introduction to Memory
+- 05.02 Short-term Memory (explainer + problem + solution)
+- 05.03 Long-term Memory
+```
+
+Create:
+
+```bash
+mkdir -p exercises/05-memory-skill-building/05.01-introduction-to-memory/explainer
+mkdir -p exercises/05-memory-skill-building/05.02-short-term-memory/{explainer,problem,solution}
+mkdir -p exercises/05-memory-skill-building/05.03-long-term-memory/explainer
+```
+
+Then create readme stubs:
+
+```
+exercises/05-memory-skill-building/05.01-introduction-to-memory/explainer/readme.md -> "# Introduction to Memory"
+exercises/05-memory-skill-building/05.02-short-term-memory/explainer/readme.md -> "# Short-term Memory"
+exercises/05-memory-skill-building/05.02-short-term-memory/problem/readme.md -> "# Short-term Memory"
+exercises/05-memory-skill-building/05.02-short-term-memory/solution/readme.md -> "# Short-term Memory"
+exercises/05-memory-skill-building/05.03-long-term-memory/explainer/readme.md -> "# Long-term Memory"
+```
diff --git a/.agents/skills/scaffold-exercises/agents/openai.yaml b/.agents/skills/scaffold-exercises/agents/openai.yaml
new file mode 100644
index 00000000..963723a5
--- /dev/null
+++ b/.agents/skills/scaffold-exercises/agents/openai.yaml
@@ -0,0 +1,3 @@
+interface:
+  display_name: "Scaffold Exercises"
+  short_description: "Scaffold lint-ready course exercises"
diff --git a/.agents/skills/setup-matt-pocock-skills/SKILL.md b/.agents/skills/setup-matt-pocock-skills/SKILL.md
new file mode 100644
index 00000000..7f6f576e
--- /dev/null
+++ b/.agents/skills/setup-matt-pocock-skills/SKILL.md
@@ -0,0 +1,116 @@
+---
+name: setup-matt-pocock-skills
+description: "Configure this repo for the engineering skills: set up its issue tracker, triage label vocabulary, and domain doc layout. Run once before first use of the other engineering skills."
+disable-model-invocation: true
+---
+
+# Setup Matt Pocock's Skills
+
+Scaffold the per-repo configuration that the engineering skills assume:
+
+- **Issue tracker**: where issues live (GitHub by default; local markdown is also supported out of the box)
+- **Triage labels**: the strings used for the five canonical triage roles
+- **Domain docs**: where `CONTEXT.md` and ADRs live, and the consumer rules for reading them
+
+This is a prompt-driven skill, not a deterministic script. Explore, present what you found, confirm with the user, then write.
+
+## Process
+
+### 1. Explore
+
+Look at the current repo to understand its starting state. Read whatever exists; don't assume:
+
+- `git remote -v` and `.git/config`: is this a GitHub repo? Which one?
+- `AGENTS.md` and `CLAUDE.md` at the repo root: does either exist? Is there already an `## Agent skills` section in either?
+- `CONTEXT.md` and `CONTEXT-MAP.md` at the repo root
+- `docs/adr/` and any `src/*/docs/adr/` directories
+- `docs/agents/`: does this skill's prior output already exist?
+- `.scratch/`: a sign that a local-markdown issue tracker convention is already in use
+- Is the `triage` skill installed? (a `triage` skill folder alongside this one, or `triage` in your available skills.) This decides whether Section B runs at all.
+- Monorepo signals: a `pnpm-workspace.yaml`, a `workspaces` field in `package.json`, or a populated `packages/*` with its own `src/`. These are present only in a genuinely large multi-package repo; their absence means single-context, which is almost every repo.
+
+### 2. Present findings and ask
+
+Summarise what's present and what's missing. Then take the sections in order. One section, one answer, then the next.
+
+Lead each section with the recommended answer so the user can accept it in a word. Give a one-line explainer only when the choice genuinely branches; skip the section entirely when exploration already settled it (Section B when `triage` isn't installed, Section C when there's no monorepo).
+
+**Section A: Issue tracker.**
+
+> Explainer: The "issue tracker" is where issues live for this repo. Skills like `to-tickets`, `triage`, and `to-spec` read from and write to it. They need to know whether to call `gh issue create`, write a markdown file under `.scratch/`, or follow some other workflow you describe. Pick the place you actually track work for this repo.
+
+Default posture: these skills were designed for GitHub. If a `git remote` points at GitHub, propose that. If a `git remote` points at GitLab (`gitlab.com` or a self-hosted host), propose GitLab. Otherwise (or if the user prefers), offer:
+
+- **GitHub**: issues live in the repo's GitHub Issues (uses the `gh` CLI)
+- **GitLab**: issues live in the repo's GitLab Issues (uses the [`glab`](https://gitlab.com/gitlab-org/cli) CLI)
+- **Local markdown**: issues live as files under `.scratch/<feature>/` in this repo (good for solo projects or repos without a remote)
+- **Other** (Jira, Linear, etc.): ask the user to describe the workflow in one paragraph; the skill will record it as freeform prose
+
+Record the choice in `docs/agents/issue-tracker.md`. The GitHub and GitLab templates carry a "PRs as a request surface" flag, defaulted **off**. Leave it off and don't raise it: a user who wants external PRs in the triage queue can flip the flag in the file later.
+
+**Section B: Triage label vocabulary.** Skip this section entirely if the `triage` skill isn't installed (exploration told you), since an uninstalled skill needs no labels.
+
+If it is installed, ask exactly one question:
+
+> Do you want to keep the default triage labels? (recommended: **yes**)
+
+The defaults are the five canonical roles, each label string equal to its name: `needs-triage`, `needs-info`, `ready-for-agent`, `ready-for-human`, `wontfix`. On **yes**, write them as-is. Only if the user says no, usually because their tracker already uses other names (e.g. `bug:triage` for `needs-triage`), collect the overrides so `triage` applies existing labels instead of creating duplicates.
+
+**Section C: Domain docs.** Default to **single-context** (one `CONTEXT.md` + `docs/adr/` at the repo root). This fits almost every repo; write it without asking.
+
+Offer **multi-context** (a root `CONTEXT-MAP.md` pointing to per-context `CONTEXT.md` files) only when exploration found monorepo signals. Then confirm which layout they want.
+
+### 3. Confirm and edit
+
+Show the user a draft of:
+
+- The `## Agent skills` block to add to whichever of `CLAUDE.md` / `AGENTS.md` is being edited (see step 4 for selection rules)
+- The contents of `docs/agents/issue-tracker.md`, `docs/agents/domain.md`, and `docs/agents/triage-labels.md` (the last only when `triage` is installed)
+
+Let them edit before writing.
+
+### 4. Write
+
+**Pick the file to edit:**
+
+- If `CLAUDE.md` exists, edit it.
+- Else if `AGENTS.md` exists, edit it.
+- If neither exists, ask the user which one to create; don't pick for them.
+
+Never create `AGENTS.md` when `CLAUDE.md` already exists (or vice versa); always edit the one that's already there.
+
+If an `## Agent skills` block already exists in the chosen file, update its contents in-place rather than appending a duplicate. Don't overwrite user edits to the surrounding sections.
+
+The block:
+
+```markdown
+## Agent skills
+
+### Issue tracker
+
+[one-line summary of where issues are tracked]. See `docs/agents/issue-tracker.md`.
+
+### Triage labels
+
+[one-line summary of the label vocabulary]. See `docs/agents/triage-labels.md`.
+
+### Domain docs
+
+[one-line summary of layout: "single-context" or "multi-context"]. See `docs/agents/domain.md`.
+```
+
+Include the `### Triage labels` sub-block, and write `docs/agents/triage-labels.md`, only when `triage` is installed and Section B ran. When it isn't, both are omitted.
+
+Then write the docs files using the seed templates in this skill folder as a starting point:
+
+- [issue-tracker-github.md](./issue-tracker-github.md): GitHub issue tracker
+- [issue-tracker-gitlab.md](./issue-tracker-gitlab.md): GitLab issue tracker
+- [issue-tracker-local.md](./issue-tracker-local.md): local-markdown issue tracker
+- [triage-labels.md](./triage-labels.md): label mapping (only if `triage` is installed)
+- [domain.md](./domain.md): domain doc consumer rules + layout
+
+For "other" issue trackers, write `docs/agents/issue-tracker.md` from scratch using the user's description.
+
+### 5. Done
+
+Tell the user the setup is complete and which engineering skills will now read from these files. Mention they can edit `docs/agents/*.md` directly later; re-running this skill is only necessary if they want to switch issue trackers or restart from scratch.
diff --git a/.agents/skills/setup-matt-pocock-skills/agents/openai.yaml b/.agents/skills/setup-matt-pocock-skills/agents/openai.yaml
new file mode 100644
index 00000000..65a0da81
--- /dev/null
+++ b/.agents/skills/setup-matt-pocock-skills/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Setup Matt Pocock Skills"
+  short_description: "Configure a repo for the skills"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/setup-matt-pocock-skills/domain.md b/.agents/skills/setup-matt-pocock-skills/domain.md
new file mode 100644
index 00000000..35249041
--- /dev/null
+++ b/.agents/skills/setup-matt-pocock-skills/domain.md
@@ -0,0 +1,51 @@
+# Domain Docs
+
+How the engineering skills should consume this repo's domain documentation when exploring the codebase.
+
+## Before exploring, read these
+
+- **`CONTEXT.md`** at the repo root, or
+- **`CONTEXT-MAP.md`** at the repo root if it exists: it points at one `CONTEXT.md` per context. Read each one relevant to the topic.
+- **`docs/adr/`**: read ADRs that touch the area you're about to work in. In multi-context repos, also check `src/<context>/docs/adr/` for context-scoped decisions.
+
+If any of these files don't exist, **proceed silently**. Don't flag their absence; don't suggest creating them upfront. The `/domain-modeling` skill (reached via `/grill-with-docs` and `/improve-codebase-architecture`) creates them lazily when terms or decisions actually get resolved.
+
+## File structure
+
+Single-context repo (most repos):
+
+```
+/
+├── CONTEXT.md
+├── docs/adr/
+│   ├── 0001-event-sourced-orders.md
+│   └── 0002-postgres-for-write-model.md
+└── src/
+```
+
+Multi-context repo (presence of `CONTEXT-MAP.md` at the root):
+
+```
+/
+├── CONTEXT-MAP.md
+├── docs/adr/                          ← system-wide decisions
+└── src/
+    ├── ordering/
+    │   ├── CONTEXT.md
+    │   └── docs/adr/                  ← context-specific decisions
+    └── billing/
+        ├── CONTEXT.md
+        └── docs/adr/
+```
+
+## Use the glossary's vocabulary
+
+When your output names a domain concept (in an issue title, a refactor proposal, a hypothesis, a test name), use the term as defined in `CONTEXT.md`. Don't drift to synonyms the glossary explicitly avoids.
+
+If the concept you need isn't in the glossary yet, that's a signal: either you're inventing language the project doesn't use (reconsider) or there's a real gap (note it for `/domain-modeling`).
+
+## Flag ADR conflicts
+
+If your output contradicts an existing ADR, surface it explicitly rather than silently overriding:
+
+> _Contradicts ADR-0007 (event-sourced orders), but worth reopening because…_
diff --git a/.agents/skills/setup-matt-pocock-skills/issue-tracker-github.md b/.agents/skills/setup-matt-pocock-skills/issue-tracker-github.md
new file mode 100644
index 00000000..b258aeb3
--- /dev/null
+++ b/.agents/skills/setup-matt-pocock-skills/issue-tracker-github.md
@@ -0,0 +1,45 @@
+# Issue tracker: GitHub
+
+Issues and specs for this repo live as GitHub issues. Use the `gh` CLI for all operations.
+
+## Conventions
+
+- **Create an issue**: `gh issue create --title "..." --body "..."`. Use a heredoc for multi-line bodies.
+- **Read an issue**: `gh issue view <number> --comments`, filtering comments by `jq` and also fetching labels.
+- **List issues**: `gh issue list --state open --json number,title,body,labels,comments --jq '[.[] | {number, title, body, labels: [.labels[].name], comments: [.comments[].body]}]'` with appropriate `--label` and `--state` filters.
+- **Comment on an issue**: `gh issue comment <number> --body "..."`
+- **Apply / remove labels**: `gh issue edit <number> --add-label "..."` / `--remove-label "..."`
+- **Close**: `gh issue close <number> --comment "..."`
+
+Infer the repo from `git remote -v`; `gh` does this automatically when run inside a clone.
+
+## Pull requests as a triage surface
+
+**PRs as a request surface: no.** _(Set to `yes` if this repo treats external PRs as feature requests; `/triage` reads this flag.)_
+
+When set to `yes`, PRs run through the same labels and states as issues, using the `gh pr` equivalents:
+
+- **Read a PR**: `gh pr view <number> --comments` and `gh pr diff <number>` for the diff.
+- **List external PRs for triage**: `gh pr list --state open --json number,title,body,labels,author,authorAssociation,comments` then keep only `authorAssociation` of `CONTRIBUTOR`, `FIRST_TIME_CONTRIBUTOR`, or `NONE` (drop `OWNER`/`MEMBER`/`COLLABORATOR`).
+- **Comment / label / close**: `gh pr comment`, `gh pr edit --add-label`/`--remove-label`, `gh pr close`.
+
+GitHub shares one number space across issues and PRs, so a bare `#42` may be either: resolve with `gh pr view 42` and fall back to `gh issue view 42`.
+
+## When a skill says "publish to the issue tracker"
+
+Create a GitHub issue.
+
+## When a skill says "fetch the relevant ticket"
+
+Run `gh issue view <number> --comments`.
+
+## Wayfinding operations
+
+Used by `/wayfinder`. The **map** is a single issue with **child** issues as tickets.
+
+- **Map**: a single issue labelled `wayfinder:map`, holding the Notes / Decisions-so-far / Fog body. `gh issue create --label wayfinder:map`.
+- **Child ticket**: an issue linked to the map as a GitHub sub-issue (`gh api` on the sub-issues endpoint). Where sub-issues aren't enabled, add the child to a task list in the map body and put `Part of #<map>` at the top of the child body. Labels: `wayfinder:<type>` (`research`/`prototype`/`grilling`/`task`). Once claimed, the ticket is assigned to the driving dev.
+- **Blocking**: GitHub's **native issue dependencies**, the canonical, UI-visible representation. Add an edge with `gh api --method POST repos/<owner>/<repo>/issues/<child>/dependencies/blocked_by -F issue_id=<blocker-db-id>`, where `<blocker-db-id>` is the blocker's numeric **database id** (`gh api repos/<owner>/<repo>/issues/<n> --jq .id`, _not_ the `#number` or `node_id`). GitHub reports `issue_dependencies_summary.blocked_by` (open blockers only, the live gate). Where dependencies aren't available, fall back to a `Blocked by: #<n>, #<n>` line at the top of the child body. A ticket is unblocked when every blocker is closed.
+- **Frontier query**: list the map's open children (`gh issue list --state open`, scoped to the map's sub-issues / task list), drop any with an open blocker (`issue_dependencies_summary.blocked_by > 0`, or an open issue in the `Blocked by` line) or an assignee; first in map order wins.
+- **Claim**: `gh issue edit <n> --add-assignee @me`, the session's first write.
+- **Resolve**: `gh issue comment <n> --body "<answer>"`, then `gh issue close <n>`, then append a context pointer (gist + link) to the map's Decisions-so-far.
diff --git a/.agents/skills/setup-matt-pocock-skills/issue-tracker-gitlab.md b/.agents/skills/setup-matt-pocock-skills/issue-tracker-gitlab.md
new file mode 100644
index 00000000..251035a6
--- /dev/null
+++ b/.agents/skills/setup-matt-pocock-skills/issue-tracker-gitlab.md
@@ -0,0 +1,46 @@
+# Issue tracker: GitLab
+
+Issues and specs for this repo live as GitLab issues. Use the [`glab`](https://gitlab.com/gitlab-org/cli) CLI for all operations.
+
+## Conventions
+
+- **Create an issue**: `glab issue create --title "..." --description "..."`. Use a heredoc for multi-line descriptions. Pass `--description -` to open an editor.
+- **Read an issue**: `glab issue view <number> --comments`. Use `-F json` for machine-readable output.
+- **List issues**: `glab issue list -F json` with appropriate `--label` filters.
+- **Comment on an issue**: `glab issue note <number> --message "..."`. GitLab calls comments "notes".
+- **Apply / remove labels**: `glab issue update <number> --label "..."` / `--unlabel "..."`. Multiple labels can be comma-separated or by repeating the flag.
+- **Close**: `glab issue close <number>`. `glab issue close` does not accept a closing comment, so post the explanation first with `glab issue note <number> --message "..."`, then close.
+- **Merge requests**: GitLab calls PRs "merge requests". Use `glab mr create`, `glab mr view`, `glab mr note`, etc., the same shape as `gh pr ...` with `mr` in place of `pr` and `note`/`--message` in place of `comment`/`--body`.
+
+Infer the repo from `git remote -v`; `glab` does this automatically when run inside a clone.
+
+## Merge requests as a triage surface
+
+**MRs as a request surface: no.** _(Set to `yes` if this repo treats external merge requests as feature requests; `/triage` reads this flag.)_
+
+When set to `yes`, MRs run through the same labels and states as issues, using the `glab mr` equivalents:
+
+- **Read an MR**: `glab mr view <number> --comments` and `glab mr diff <number>` for the diff.
+- **List external MRs for triage**: `glab mr list -F json`, then keep only MRs whose author is not a project member/owner (a contributor's MR, not a maintainer's in-flight work).
+- **Comment / label / close**: `glab mr note`, `glab mr update --label`/`--unlabel`, `glab mr close`.
+
+Unlike GitHub, GitLab numbers issues and MRs separately, so `#42` is unambiguous once you know which surface the maintainer means.
+
+## When a skill says "publish to the issue tracker"
+
+Create a GitLab issue.
+
+## When a skill says "fetch the relevant ticket"
+
+Run `glab issue view <number> --comments`.
+
+## Wayfinding operations
+
+Used by `/wayfinder`. The **map** is a single issue with **child** issues as tickets.
+
+- **Map**: a single issue labelled `wayfinder:map`, holding the Notes / Decisions-so-far / Fog body. `glab issue create --label wayfinder:map`. (On GitLab tiers with native epics, an epic may hold the map instead; a labelled issue works everywhere.)
+- **Child ticket**: an issue carrying `Part of #<map>` at the top of its description and labels `wayfinder:<type>` (`research`/`prototype`/`grilling`/`task`). Once claimed, the ticket is assigned to the driving dev.
+- **Blocking**: GitLab's **native blocking link**, the canonical, UI-visible representation. Add it with the `/blocked_by #<n>` quick action, posted as a note (`glab issue note <child> --message "/blocked_by #<blocker>"`). Native blocking links are a Premium/Ultimate feature; on the free tier (or where unavailable) fall back to a `Blocked by: #<n>, #<n>` line at the top of the description. A ticket is unblocked when every blocker is closed.
+- **Frontier query**: `glab issue list -F json` scoped to the map's children, drop any with an open blocker: a native `blocked_by` link to an open issue (`glab api projects/:id/issues/:iid/links`), or an open issue in the `Blocked by` line, or an assignee; first in map order wins.
+- **Claim**: `glab issue update <n> --assignee @me`, the session's first write.
+- **Resolve**: `glab issue note <n> --message "<answer>"`, then `glab issue close <n>`, then append a context pointer (gist + link) to the map's Decisions-so-far.
diff --git a/.agents/skills/setup-matt-pocock-skills/issue-tracker-local.md b/.agents/skills/setup-matt-pocock-skills/issue-tracker-local.md
new file mode 100644
index 00000000..0209a19a
--- /dev/null
+++ b/.agents/skills/setup-matt-pocock-skills/issue-tracker-local.md
@@ -0,0 +1,30 @@
+# Issue tracker: Local Markdown
+
+Issues and specs for this repo live as markdown files in `.scratch/`.
+
+## Conventions
+
+- One feature per directory: `.scratch/<feature-slug>/`
+- The spec is `.scratch/<feature-slug>/spec.md`
+- Implementation issues are one file per ticket at `.scratch/<feature-slug>/issues/<NN>-<slug>.md`, numbered from `01`, never a single combined tickets file
+- Triage state is recorded as a `Status:` line near the top of each issue file (see `triage-labels.md` for the role strings)
+- Comments and conversation history append to the bottom of the file under a `## Comments` heading
+
+## When a skill says "publish to the issue tracker"
+
+Create a new file under `.scratch/<feature-slug>/` (creating the directory if needed).
+
+## When a skill says "fetch the relevant ticket"
+
+Read the file at the referenced path. The user will normally pass the path or the issue number directly.
+
+## Wayfinding operations
+
+Used by `/wayfinder`. The **map** is a file with one **child** file per ticket.
+
+- **Map**: `.scratch/<effort>/map.md` (the Notes / Decisions-so-far / Fog body).
+- **Child ticket**: `.scratch/<effort>/issues/NN-<slug>.md`, numbered from `01`, with the question in the body. A `Type:` line records the ticket type (`research`/`prototype`/`grilling`/`task`); a `Status:` line records `claimed`/`resolved`.
+- **Blocking**: a `Blocked by: NN, NN` line near the top. A ticket is unblocked when every file it lists is `resolved`.
+- **Frontier**: scan `.scratch/<effort>/issues/` for files that are open, unblocked, and unclaimed; first by number wins.
+- **Claim**: set `Status: claimed` and save before any work.
+- **Resolve**: append the answer under an `## Answer` heading, set `Status: resolved`, then append a context pointer (gist + link) to the map's Decisions-so-far in `map.md`.
diff --git a/.agents/skills/setup-matt-pocock-skills/triage-labels.md b/.agents/skills/setup-matt-pocock-skills/triage-labels.md
new file mode 100644
index 00000000..b716855d
--- /dev/null
+++ b/.agents/skills/setup-matt-pocock-skills/triage-labels.md
@@ -0,0 +1,15 @@
+# Triage Labels
+
+The skills speak in terms of five canonical triage roles. This file maps those roles to the actual label strings used in this repo's issue tracker.
+
+| Label in mattpocock/skills | Label in our tracker | Meaning                                  |
+| -------------------------- | -------------------- | ---------------------------------------- |
+| `needs-triage`             | `needs-triage`       | Maintainer needs to evaluate this issue  |
+| `needs-info`               | `needs-info`         | Waiting on reporter for more information |
+| `ready-for-agent`          | `ready-for-agent`    | Fully specified, ready for an AFK agent  |
+| `ready-for-human`          | `ready-for-human`    | Requires human implementation            |
+| `wontfix`                  | `wontfix`            | Will not be actioned                     |
+
+When a skill mentions a role (e.g. "apply the AFK-ready triage label"), use the corresponding label string from this table.
+
+Edit the right-hand column to match whatever vocabulary you actually use.
diff --git a/.agents/skills/setup-pre-commit/SKILL.md b/.agents/skills/setup-pre-commit/SKILL.md
new file mode 100644
index 00000000..1b970816
--- /dev/null
+++ b/.agents/skills/setup-pre-commit/SKILL.md
@@ -0,0 +1,91 @@
+---
+name: setup-pre-commit
+description: Set up Husky pre-commit hooks with lint-staged (Prettier), type checking, and tests in the current repo. Use when user wants to add pre-commit hooks, set up Husky, configure lint-staged, or add commit-time formatting/typechecking/testing.
+---
+
+# Setup Pre-Commit Hooks
+
+## What This Sets Up
+
+- **Husky** pre-commit hook
+- **lint-staged** running Prettier on all staged files
+- **Prettier** config (if missing)
+- **typecheck** and **test** scripts in the pre-commit hook
+
+## Steps
+
+### 1. Detect package manager
+
+Check for `package-lock.json` (npm), `pnpm-lock.yaml` (pnpm), `yarn.lock` (yarn), `bun.lockb` (bun). Use whichever is present. Default to npm if unclear.
+
+### 2. Install dependencies
+
+Install as devDependencies:
+
+```
+husky lint-staged prettier
+```
+
+### 3. Initialize Husky
+
+```bash
+npx husky init
+```
+
+This creates `.husky/` dir and adds `prepare: "husky"` to package.json.
+
+### 4. Create `.husky/pre-commit`
+
+Write this file (no shebang needed for Husky v9+):
+
+```
+npx lint-staged
+npm run typecheck
+npm run test
+```
+
+**Adapt**: Replace `npm` with detected package manager. If repo has no `typecheck` or `test` script in package.json, omit those lines and tell the user.
+
+### 5. Create `.lintstagedrc`
+
+```json
+{
+  "*": "prettier --ignore-unknown --write"
+}
+```
+
+### 6. Create `.prettierrc` (if missing)
+
+Only create if no Prettier config exists. Use these defaults:
+
+```json
+{
+  "useTabs": false,
+  "tabWidth": 2,
+  "printWidth": 80,
+  "singleQuote": false,
+  "trailingComma": "es5",
+  "semi": true,
+  "arrowParens": "always"
+}
+```
+
+### 7. Verify
+
+- [ ] `.husky/pre-commit` exists and is executable
+- [ ] `.lintstagedrc` exists
+- [ ] `prepare` script in package.json is `"husky"`
+- [ ] `prettier` config exists
+- [ ] Run `npx lint-staged` to verify it works
+
+### 8. Commit
+
+Stage all changed/created files and commit with message: `Add pre-commit hooks (husky + lint-staged + prettier)`
+
+This will run through the new pre-commit hooks: a good smoke test that everything works.
+
+## Notes
+
+- Husky v9+ doesn't need shebangs in hook files
+- `prettier --ignore-unknown` skips files Prettier can't parse (images, etc.)
+- The pre-commit runs lint-staged first (fast, staged-only), then full typecheck and tests
diff --git a/.agents/skills/setup-pre-commit/agents/openai.yaml b/.agents/skills/setup-pre-commit/agents/openai.yaml
new file mode 100644
index 00000000..e5a1c63d
--- /dev/null
+++ b/.agents/skills/setup-pre-commit/agents/openai.yaml
@@ -0,0 +1,3 @@
+interface:
+  display_name: "Setup Pre-Commit"
+  short_description: "Add pre-commit quality checks"
diff --git a/.agents/skills/setup-ts-deep-modules/SKILL.md b/.agents/skills/setup-ts-deep-modules/SKILL.md
new file mode 100644
index 00000000..7e30047e
--- /dev/null
+++ b/.agents/skills/setup-ts-deep-modules/SKILL.md
@@ -0,0 +1,102 @@
+---
+name: setup-ts-deep-modules
+description: Wire dependency-cruiser into a TypeScript repo so each package is a deep module, with implementation hidden in subfolders and reachable only through its entry-point files. User-invoked.
+disable-model-invocation: true
+---
+
+# Setup TS Deep Modules
+
+Make every package in this repo a **deep module**: a lot of behaviour behind a small interface. A package's public surface is its **entry points** (the files at the package root), and everything in its subfolders is hidden. This skill installs [dependency-cruiser](https://github.com/sverweij/dependency-cruiser) and the rules that make the entry points the only way in, then proves the rules bite.
+
+For the vocabulary (deep module, interface, seam, depth), call the Skill tool with "codebase-design" and use its language throughout.
+
+## The shape this enforces
+
+```
+src/packages/
+  <name>/
+    index.ts        ← an entry point (public). Import this from outside.
+    client.ts       ← another entry point. Packages may expose SEVERAL.
+    lib/            ← implementation: hidden from outside, free to import each other.
+    tests/          ← co-located tests + fixtures (a subfolder, so private).
+```
+
+The public surface is the package's **root files**, not one designated `index.ts`. By convention implementation lives in `lib/` and tests in `tests/`, giving every package the same two-folder shape. The rule itself is general, though: *anything* in *any* subfolder is private, so you never extend the config to add a folder.
+
+Four rules, all `error`:
+
+1. **Entry-point boundary**: code outside a package (app code or another package) may import only that package's entry points (its root files), never anything in its subfolders.
+2. **Intra-package freedom**: a package's own files import each other freely.
+3. **Tests through the entry points**: files under `<pkg>/tests/` may import any package's entry points and their own `tests/` fixtures, but never any package's subfolder internals (not even their own). Integration tests across packages are fine; deep imports are not.
+4. **No cycles**: no dependency cycles.
+
+**Entry points, not a barrel.** Because the public surface is *every* root file, a package can expose several small entry points (`index.ts`, `client.ts`, `server.ts`) instead of funnelling everything through one giant `index.ts`. Barrel files that re-export a whole subtree are discouraged; keep entry points small and hide implementation in subfolders.
+
+Layering (which packages may depend on which) is a *different* concern and is left as a commented stub in the config for this repo to fill in.
+
+## Steps
+
+### 1. Detect the environment
+
+- **Package manager**: `pnpm-lock.yaml` → pnpm, `yarn.lock` → yarn, `bun.lockb` → bun, else npm. Use it for every command below (`pnpm`/`yarn`/`npm run`/`bunx`).
+- **Packages root**: if `src/` exists use `src/packages`, else `packages`. Confirm the choice with the user if the repo already has a different obvious convention.
+- **Existing config**: check for a `.dependency-cruiser.*` file. If one exists, do **not** overwrite it: merge the four rules and the options in, and tell the user what you added.
+
+**Done when:** package manager, packages root, and existing-config status are all known.
+
+### 2. Install dependency-cruiser
+
+Install `dependency-cruiser` as a devDependency with the detected package manager.
+
+**Done when:** `dependency-cruiser` is in `devDependencies`.
+
+### 3. Write the config
+
+Copy [`dependency-cruiser.config.cjs`](./dependency-cruiser.config.cjs) to the repo root as `.dependency-cruiser.cjs`. Set `PACKAGES_ROOT` to the root detected in step 1. The rules are path-depth based and extension-agnostic, so nothing else needs adapting.
+
+**Done when:** `.dependency-cruiser.cjs` exists with the correct `PACKAGES_ROOT`, and the four forbidden rules are present.
+
+### 4. Wire it into the checks
+
+- Add a `lint:boundaries` script: `depcruise <packages-root>` (or `depcruise src`).
+- Fold it into the repo's umbrella check command, the one that already runs typecheck (e.g. a `check` / `ci` / `validate` script). Do **not** touch `tsconfig` or add path aliases.
+- If there is no umbrella script, add `lint:boundaries` and tell the user to include it in CI.
+
+**Done when:** `lint:boundaries` exists and runs as part of the same command as typecheck.
+
+### 5. Scaffold the example package
+
+Create a committed `<packages-root>/example/` as a copy-me template:
+
+- `index.ts` is an entry point. Export one function that delegates to an internal file (so the package is visibly *deep*, not a pass-through).
+- `lib/impl.ts`: an internal file in a **subfolder**, imported by `index.ts`, not reachable from outside.
+- `tests/example.test.ts` imports **only** `../index` (an entry point) and asserts against the public function.
+
+Tell the user this is a starter template to copy or delete.
+
+**Done when:** the example package exists, exposes its behaviour through a root entry point, and hides `impl` in a subfolder.
+
+### 6. Prove the rules bite
+
+This is the completion criterion for the whole skill: a config that doesn't fail on a violation is worthless.
+
+1. Run `lint:boundaries`. It must **pass** on the clean example.
+2. Temporarily add a deep import to `tests/example.test.ts` (e.g. `import { thing } from "../lib/impl"`). Run `lint:boundaries` again; it must **fail** with `tests-through-entrypoints`.
+3. Revert the deep import. Run once more, and it must **pass**.
+
+**Done when:** you have observed a pass, then a fail on the deep import, then a pass again. If step 2 does not fail, the rules are not wired correctly, so fix before finishing.
+
+### 7. Document the convention
+
+Write a `README.md` **in the packages folder** (`<packages-root>/README.md`, next to the packages it governs) covering: the `src/packages/<name>/` layout (entry points at the root, `lib/` for implementation, `tests/` for tests), "import only through a package's entry points (its root files)", and how to run `lint:boundaries`. **Discourage barrel files** explicitly: expose several small entry points instead of re-exporting a whole subtree through one index. Keep it to the copy-me snippet plus the four rules in one paragraph each.
+
+Then add a **context pointer** to it from the repo's agent-instructions file (`CLAUDE.md` if present, else `AGENTS.md`, creating `AGENTS.md` if neither exists). One line is enough, e.g. `Packages are deep modules: see [src/packages/README.md](./src/packages/README.md) before adding or importing one.` This is what makes an agent discover the boundary rule instead of tripping over it.
+
+**Done when:** `<packages-root>/README.md` exists and discourages barrels, and the repo's `CLAUDE.md`/`AGENTS.md` links to it.
+
+## Notes
+
+- The config's `$1` back-references (dependency-cruiser's group matching) are what let a package reach its own internals while outsiders can't. Don't flatten them into separate per-package rules.
+- Public vs private is decided by **depth**: a package's root files are entry points; anything in a subfolder is private. The conventional subfolders are `lib/` (implementation) and `tests/`, but the rule doesn't hardcode them: any subfolder is private, so a new folder never needs a config change. Adding an entry point is just adding a root file (no barrel).
+- Packages are **flat**: one tier of immediate children under the root. A package's internals may nest as deep as you like; a package may not contain another package.
+- Use `.cjs` (not `.js`) so the config's `module.exports` works even in `"type": "module"` repos.
diff --git a/.agents/skills/setup-ts-deep-modules/agents/openai.yaml b/.agents/skills/setup-ts-deep-modules/agents/openai.yaml
new file mode 100644
index 00000000..5d0581bd
--- /dev/null
+++ b/.agents/skills/setup-ts-deep-modules/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Setup TS Deep Modules"
+  short_description: "Enforce deep TypeScript modules"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/setup-ts-deep-modules/dependency-cruiser.config.cjs b/.agents/skills/setup-ts-deep-modules/dependency-cruiser.config.cjs
new file mode 100644
index 00000000..54030ede
--- /dev/null
+++ b/.agents/skills/setup-ts-deep-modules/dependency-cruiser.config.cjs
@@ -0,0 +1,95 @@
+// @ts-check
+// Deep-module enforcement for dependency-cruiser.
+//
+// Each package under the packages root is a DEEP MODULE: a lot of behaviour
+// behind a small interface. A package's PUBLIC SURFACE is its ENTRY POINTS:
+// the files at the package root. Implementation lives in SUBFOLDERS and is
+// private (by convention `lib/` for implementation and `tests/` for tests,
+// though any subfolder is private). A package may expose several small entry
+// points (index.ts, client.ts, server.ts, …); prefer that over one giant
+// barrel index.
+//
+// The only thing you should ever need to edit here is PACKAGES_ROOT.
+
+/** Where packages live. One immediate child dir per package (flat, no nesting). */
+const PACKAGES_ROOT = "src/packages";
+
+// --- derived patterns (no need to edit) -------------------------------------
+const R = PACKAGES_ROOT;
+/**
+ * A package's private internals: anything nested inside a package subfolder.
+ * The package's root files are its entry points and are NOT matched here:
+ * they stay importable from outside.
+ */
+const PACKAGE_INTERNALS = `^${R}/[^/]+/[^/]+/`;
+
+/** @type {import('dependency-cruiser').IConfiguration} */
+module.exports = {
+  forbidden: [
+    {
+      name: "entrypoint-boundary-from-app",
+      comment:
+        "App/root code may import a package's entry points (its root files), but nothing inside its subfolders.",
+      severity: "error",
+      from: { pathNot: `^${R}/` }, // importer is NOT inside any package
+      to: { path: PACKAGE_INTERNALS },
+    },
+    {
+      name: "entrypoint-boundary-across-packages",
+      comment:
+        "A package's own files import each other freely, but may reach OTHER packages only through their entry points, never their internals.",
+      severity: "error",
+      // importer is inside a package ($1), but is not a test file
+      from: { path: `^${R}/([^/]+)/`, pathNot: `^${R}/[^/]+/tests/` },
+      to: {
+        path: PACKAGE_INTERNALS,
+        pathNot: `^${R}/$1/`, // same package → intra-package freedom
+      },
+    },
+    {
+      name: "tests-through-entrypoints",
+      comment:
+        "A package's tests exercise it through its entry points like everyone else: they may import any package's entry points and their own tests/ fixtures, but never any package's internals, not even their own.",
+      severity: "error",
+      from: { path: `^${R}/([^/]+)/tests/` }, // a test file, in package $1
+      to: {
+        path: PACKAGE_INTERNALS,
+        pathNot: `^${R}/$1/tests/`, // own tests/ fixtures → allowed
+      },
+    },
+    {
+      name: "tests-folder-is-private",
+      comment:
+        "A package's tests/ folder is reachable only from tests: nothing else may import fixtures.",
+      severity: "error",
+      from: { pathNot: `^${R}/[^/]+/tests/` }, // importer is not itself a test
+      to: { path: `^${R}/[^/]+/tests/` },
+    },
+    {
+      name: "no-circular",
+      comment: "No dependency cycles. Scope to `^${R}/` if you want to allow cycles outside packages.",
+      severity: "error",
+      from: {},
+      to: { circular: true },
+    },
+
+    // --- Layering (optional, off by default) ----------------------------------
+    // Interface-hiding controls HOW you import (through the entry points).
+    // Layering controls WHICH packages may depend on which. Add your own rules
+    // here, e.g.:
+    //
+    // {
+    //   name: "ui-may-not-depend-on-billing",
+    //   severity: "error",
+    //   from: { path: `^${R}/ui/` },
+    //   to:   { path: `^${R}/billing/` },
+    // },
+  ],
+  options: {
+    doNotFollow: { path: "node_modules" },
+    tsConfig: { fileName: "tsconfig.json" },
+    enhancedResolveOptions: {
+      extensions: [".ts", ".tsx", ".js", ".jsx", ".json"],
+    },
+  },
+};
diff --git a/.agents/skills/tdd/SKILL.md b/.agents/skills/tdd/SKILL.md
new file mode 100644
index 00000000..8fc08671
--- /dev/null
+++ b/.agents/skills/tdd/SKILL.md
@@ -0,0 +1,38 @@
+---
+name: tdd
+description: Test-driven development. Use when the user wants to build features or fix bugs test-first, mentions "red-green-refactor", or wants integration tests.
+---
+
+# Test-Driven Development
+
+TDD is the red → green loop. This skill is the reference that makes that loop produce tests worth keeping: what a good test is, where tests go, the anti-patterns, and the rules of the loop. Every section applies on every cycle: consult them before and during the loop, not after.
+
+When exploring the codebase, read `CONTEXT.md` (if it exists) so test names and interface vocabulary match the project's domain language, and respect ADRs in the area you're touching.
+
+## What a good test is
+
+Tests verify behavior through public interfaces, not implementation details. Code can change entirely; tests shouldn't. A good test reads like a specification: "user can checkout with valid cart" tells you exactly what capability exists, and it survives refactors because it doesn't care about internal structure.
+
+See [tests.md](tests.md) for examples and [mocking.md](mocking.md) for mocking guidelines.
+
+## Seams: where tests go
+
+A **seam** is the public boundary you test at: the interface where you observe behavior without reaching inside. Tests live at seams, never against internals.
+
+**Test only at pre-agreed seams.** Before writing any test, write down the seams under test and confirm them with the user. No test is written at an unconfirmed seam. You can't test everything, so agreeing the seams up front is how testing effort lands on the critical paths and complex logic instead of every edge case.
+
+Ask: "What's the public interface, and which seams should we test?"
+
+When the shape of that interface is itself in question (how deep the module is, where the seam belongs, what the interface should expose), call the Skill tool with "codebase-design" for the vocabulary. It is the shared source of the module, interface, depth, seam, adapter, leverage and locality terms, and it is a reference to consult, not a session to run.
+
+## Anti-patterns
+
+- **Implementation-coupled**: mocks internal collaborators, tests private methods, or verifies through a side channel (querying the database instead of using the interface). The tell: the test breaks when you refactor but behavior hasn't changed.
+- **Tautological**: the assertion recomputes the expected value the way the code does (`expect(add(a, b)).toBe(a + b)`, a snapshot derived by hand the same way, a constant asserted equal to itself), so it passes by construction and can never disagree with the code. Expected values must come from an independent source of truth: a known-good literal, a worked example, the spec.
+- **Horizontal slicing**: writing all tests first, then all implementation. Bulk tests verify _imagined_ behavior: you test the _shape_ of things rather than user-facing behavior, the tests go insensitive to real changes, and you commit to test structure before understanding the implementation. Work in **vertical slices** instead: one test → one implementation → repeat, each test a **tracer bullet** that responds to what the last cycle taught you.
+
+## Rules of the loop
+
+- **Red before green.** Write the failing test first, then only enough code to pass it. Don't anticipate future tests or add speculative features.
+- **One slice at a time.** One seam, one test, one minimal implementation per cycle.
+- **Refactoring is not part of the loop.** It belongs to the review stage (see the `code-review` skill), not the red → green implementation cycle.
diff --git a/.agents/skills/tdd/agents/openai.yaml b/.agents/skills/tdd/agents/openai.yaml
new file mode 100644
index 00000000..651b838a
--- /dev/null
+++ b/.agents/skills/tdd/agents/openai.yaml
@@ -0,0 +1,3 @@
+interface:
+  display_name: "TDD"
+  short_description: "Test-driven red-green-refactor"
diff --git a/.agents/skills/tdd/mocking.md b/.agents/skills/tdd/mocking.md
new file mode 100644
index 00000000..71cbfee6
--- /dev/null
+++ b/.agents/skills/tdd/mocking.md
@@ -0,0 +1,59 @@
+# When to Mock
+
+Mock at **system boundaries** only:
+
+- External APIs (payment, email, etc.)
+- Databases (sometimes - prefer test DB)
+- Time/randomness
+- File system (sometimes)
+
+Don't mock:
+
+- Your own classes/modules
+- Internal collaborators
+- Anything you control
+
+## Designing for Mockability
+
+At system boundaries, design interfaces that are easy to mock:
+
+**1. Use dependency injection**
+
+Pass external dependencies in rather than creating them internally:
+
+```typescript
+// Easy to mock
+function processPayment(order, paymentClient) {
+  return paymentClient.charge(order.total);
+}
+
+// Hard to mock
+function processPayment(order) {
+  const client = new StripeClient(process.env.STRIPE_KEY);
+  return client.charge(order.total);
+}
+```
+
+**2. Prefer SDK-style interfaces over generic fetchers**
+
+Create specific functions for each external operation instead of one generic function with conditional logic:
+
+```typescript
+// GOOD: Each function is independently mockable
+const api = {
+  getUser: (id) => fetch(`/users/${id}`),
+  getOrders: (userId) => fetch(`/users/${userId}/orders`),
+  createOrder: (data) => fetch('/orders', { method: 'POST', body: data }),
+};
+
+// BAD: Mocking requires conditional logic inside the mock
+const api = {
+  fetch: (endpoint, options) => fetch(endpoint, options),
+};
+```
+
+The SDK approach means:
+- Each mock returns one specific shape
+- No conditional logic in test setup
+- Easier to see which endpoints a test exercises
+- Type safety per endpoint
diff --git a/.agents/skills/tdd/tests.md b/.agents/skills/tdd/tests.md
new file mode 100644
index 00000000..7ab86479
--- /dev/null
+++ b/.agents/skills/tdd/tests.md
@@ -0,0 +1,77 @@
+# Good and Bad Tests
+
+## Good Tests
+
+**Integration-style**: Test through real interfaces, not mocks of internal parts.
+
+```typescript
+// GOOD: Tests observable behavior
+test("user can checkout with valid cart", async () => {
+  const cart = createCart();
+  cart.add(product);
+  const result = await checkout(cart, paymentMethod);
+  expect(result.status).toBe("confirmed");
+});
+```
+
+Characteristics:
+
+- Tests behavior users/callers care about
+- Uses public API only
+- Survives internal refactors
+- Describes WHAT, not HOW
+- One logical assertion per test
+
+## Bad Tests
+
+**Implementation-detail tests**: Coupled to internal structure.
+
+```typescript
+// BAD: Tests implementation details
+test("checkout calls paymentService.process", async () => {
+  const mockPayment = jest.mock(paymentService);
+  await checkout(cart, payment);
+  expect(mockPayment.process).toHaveBeenCalledWith(cart.total);
+});
+```
+
+Red flags:
+
+- Mocking internal collaborators
+- Testing private methods
+- Asserting on call counts/order
+- Test breaks when refactoring without behavior change
+- Test name describes HOW not WHAT
+- Verifying through external means instead of interface
+
+```typescript
+// BAD: Bypasses interface to verify
+test("createUser saves to database", async () => {
+  await createUser({ name: "Alice" });
+  const row = await db.query("SELECT * FROM users WHERE name = ?", ["Alice"]);
+  expect(row).toBeDefined();
+});
+
+// GOOD: Verifies through interface
+test("createUser makes user retrievable", async () => {
+  const user = await createUser({ name: "Alice" });
+  const retrieved = await getUser(user.id);
+  expect(retrieved.name).toBe("Alice");
+});
+```
+
+**Tautological tests**: Expected value restates the implementation, so the test passes by construction.
+
+```typescript
+// BAD: Expected value is recomputed the way the code computes it
+test("calculateTotal sums line items", () => {
+  const items = [{ price: 10 }, { price: 5 }];
+  const expected = items.reduce((sum, i) => sum + i.price, 0);
+  expect(calculateTotal(items)).toBe(expected);
+});
+
+// GOOD: Expected value is an independent, known literal
+test("calculateTotal sums line items", () => {
+  expect(calculateTotal([{ price: 10 }, { price: 5 }])).toBe(15);
+});
+```
diff --git a/.agents/skills/teach/GLOSSARY-FORMAT.md b/.agents/skills/teach/GLOSSARY-FORMAT.md
new file mode 100644
index 00000000..fdd7e366
--- /dev/null
+++ b/.agents/skills/teach/GLOSSARY-FORMAT.md
@@ -0,0 +1,35 @@
+# GLOSSARY.md Format
+
+`GLOSSARY.md` is the canonical language for this teaching workspace. All explainers, exercises, and learning records should adhere to its terminology. Building it is itself part of learning: compressing a concept into a tight definition is evidence the user understands it.
+
+## Structure
+
+```md
+# {Topic} Glossary
+
+{One or two sentence description of the topic this glossary covers.}
+
+## Terms
+
+**Hypertrophy**:
+Muscle growth driven by mechanical tension and metabolic stress over repeated training sessions.
+_Avoid_: Bulking, getting big
+
+**Progressive overload**:
+Systematically increasing the demand on a muscle over time, via load, volume, or intensity.
+_Avoid_: Pushing harder, levelling up
+
+**RPE (Rate of Perceived Exertion)**:
+A 1–10 self-rating of how hard a set felt, where 10 is failure and 8 means two reps left in the tank.
+_Avoid_: Effort score, intensity rating
+```
+
+## Rules
+
+- **Add a term only when the user understands it.** The glossary is a record of compressed knowledge, not a dictionary the user reads to learn. If the user has just been introduced to a concept, wait until they can use it correctly before promoting it here.
+- **Be opinionated.** When several words exist for the same concept, pick the best one and list the rest as aliases to avoid. This is how language compresses.
+- **Keep definitions tight.** One or two sentences. Define what the term IS, not what it does or how to do it.
+- **Use the glossary's own terms inside definitions.** Once a term is in the glossary, prefer it everywhere, including inside other definitions. This is what makes complex terms easier to grasp later.
+- **Group under subheadings** when natural clusters emerge (e.g. `## Anatomy`, `## Programming`). A flat list is fine when terms cohere.
+- **Flag ambiguities explicitly.** If a term is used loosely in the wider field, note the resolution: "In this workspace, 'set' always means a working set; warm-ups are tracked separately."
+- **Revise as understanding deepens.** A definition the user wrote in week one may be wrong by week six. Update in place; do not leave stale entries.
diff --git a/.agents/skills/teach/LEARNING-RECORD-FORMAT.md b/.agents/skills/teach/LEARNING-RECORD-FORMAT.md
new file mode 100644
index 00000000..953c6142
--- /dev/null
+++ b/.agents/skills/teach/LEARNING-RECORD-FORMAT.md
@@ -0,0 +1,46 @@
+# Learning Record Format
+
+Learning records live in `./learning-records/` and use sequential numbering: `0001-slug.md`, `0002-slug.md`, etc. Create the directory lazily: only when the first record is written.
+
+They are the teaching equivalent of ADRs: they capture non-obvious lessons, key insights, and stated prior knowledge that will steer future sessions. They are used to calculate the zone of proximal development.
+
+## Template
+
+```md
+# {Short title of what was learned or established}
+
+{1-3 sentences: what was learned (or what prior knowledge was established), and why it matters for future sessions.}
+```
+
+That is the whole format. A learning record can be a single paragraph. The value is recording _that_ this is now known and _why_ it changes what to teach next, not in filling out sections.
+
+## Optional sections
+
+Only include these when they add genuine value. Most records won't need them.
+
+- **Status** frontmatter (`active | superseded by LR-NNNN`): useful when an earlier understanding turns out to be wrong and is replaced.
+- **Evidence**: how the user demonstrated the understanding (a question answered, an exercise completed, prior experience cited). Useful when the claim might be revisited.
+- **Implications**: what this unlocks or rules out for future sessions. Worth recording when non-obvious.
+
+## Numbering
+
+Scan `./learning-records/` for the highest existing number and increment by one.
+
+## When to write a learning record
+
+Write one when any of these is true:
+
+1. **The user demonstrated genuine understanding of something non-trivial**: not just exposure, but evidence they can use the concept correctly. This sets a new floor for what to teach next.
+2. **The user disclosed prior knowledge**: "I already know X." Record it so future sessions don't re-teach it. Also record the _depth_ claimed.
+3. **A misconception was corrected**: the user previously believed something wrong and now sees why. These are high-value: they predict future stumbling blocks for related topics.
+4. **The mission shifted in response to learning**: the user discovered they cared about something different than they thought. Cross-link to [[MISSION.md]] and update it.
+
+### What does _not_ qualify
+
+- Material that was merely covered. Coverage is not learning. Wait for evidence.
+- Anything already captured tersely in [[GLOSSARY.md]] as a term definition. Don't duplicate.
+- Session-by-session activity logs. Learning records are not a journal: they are decision-grade insights.
+
+## Supersession
+
+When a later record contradicts an earlier one (the user's understanding deepened or corrected), mark the old record `Status: superseded by LR-NNNN` rather than deleting it. The history of how understanding evolved is itself useful signal.
diff --git a/.agents/skills/teach/MISSION-FORMAT.md b/.agents/skills/teach/MISSION-FORMAT.md
new file mode 100644
index 00000000..45250bb1
--- /dev/null
+++ b/.agents/skills/teach/MISSION-FORMAT.md
@@ -0,0 +1,31 @@
+# MISSION.md Format
+
+`MISSION.md` lives at the workspace root. It captures the _reason_ the user is learning this topic. Every teaching decision (what to teach next, which resources to surface, which exercises to design) should trace back to this document.
+
+## Template
+
+```md
+# Mission: {Topic}
+
+## Why
+{1-3 sentences. The concrete real-world goal the user is chasing. What changes in their life or work when they have this skill? Avoid abstract framings like "to understand X"; push for the underlying outcome.}
+
+## Success looks like
+- {A specific, observable thing the user will be able to do}
+- {Another specific thing}
+- {…}
+
+## Constraints
+- {Time, budget, prior commitments, learning preferences, anything that bounds the approach}
+
+## Out of scope
+- {Adjacent topics the user explicitly does not want to chase right now, protecting the zone of proximal development}
+```
+
+## Rules
+
+- **One mission per workspace.** If the user wants to learn two unrelated things, that is two workspaces.
+- **Concrete over abstract.** "Run a half marathon by October" beats "get fitter." "Ship a Rust CLI to my team" beats "learn Rust."
+- **Push back on vagueness.** If the user cannot articulate why, interview them before writing anything. A bad mission is worse than no mission.
+- **Revise when reality shifts.** Missions change. When the user's goal moves, update this file: don't leave a stale mission steering future sessions.
+- **Keep it short.** If `MISSION.md` runs past a screen, it has stopped being a compass and started being a plan.
diff --git a/.agents/skills/teach/RESOURCES-FORMAT.md b/.agents/skills/teach/RESOURCES-FORMAT.md
new file mode 100644
index 00000000..18b588c8
--- /dev/null
+++ b/.agents/skills/teach/RESOURCES-FORMAT.md
@@ -0,0 +1,32 @@
+# RESOURCES.md Format
+
+`RESOURCES.md` is the curated set of trusted sources for this topic. Knowledge for explainers should be drawn from here, not from parametric guesses. Wisdom comes from the communities listed here.
+
+## Structure
+
+```md
+# {Topic} Resources
+
+## Knowledge
+
+- [Book: _The Science and Practice of Strength Training_ by Zatsiorsky & Kraemer](https://example.com)
+  Foundational text on programming and adaptation. Use for: anything to do with periodisation, recovery, intensity zones.
+- [Article: "How Much Should I Train?" by Greg Nuckols (Stronger By Science)](https://example.com)
+  Evidence-based review of volume landmarks. Use for: weekly set targets per muscle group.
+
+## Wisdom (Communities)
+
+- [r/weightroom](https://reddit.com/r/weightroom)
+  High-signal subreddit, moderated against bro-science. Use for: programme critique, plateau troubleshooting.
+- Local: Tuesday strength class at {gym name}
+  Use for: real-time coaching feedback on lifts.
+```
+
+## Rules
+
+- **High-trust only.** Prefer primary sources, recognised experts, peer-reviewed work, and communities with strong moderation. If a resource is marketing dressed as education, leave it out.
+- **Annotate every entry.** A bare link is useless in three months. Add one line: what it covers and when to reach for it.
+- **Group by Knowledge / Wisdom.** Mirrors the philosophy in [SKILL.md](./SKILL.md). It is fine for a resource to appear in only one group.
+- **Surface gaps explicitly.** If no good resource exists for an area the mission needs, write a `## Gaps` section listing what is missing. This drives future search.
+- **Prune ruthlessly.** A resource that turned out to be wrong, shallow, or off-mission should be removed, not buried. Better five sharp sources than thirty mediocre ones.
+- **Record community preferences.** If the user has opted out of joining communities, note it here so future sessions don't keep proposing them.
diff --git a/.agents/skills/teach/SKILL.md b/.agents/skills/teach/SKILL.md
new file mode 100644
index 00000000..c679eecc
--- /dev/null
+++ b/.agents/skills/teach/SKILL.md
@@ -0,0 +1,140 @@
+---
+name: teach
+description: Teach the user a new skill or concept, within this workspace.
+disable-model-invocation: true
+argument-hint: "What would you like to learn about?"
+---
+
+The user has asked you to teach them something. This is a stateful request - they intend to learn the topic over multiple sessions.
+
+## Teaching Workspace
+
+Treat the current directory as a teaching workspace. The state of their learning is captured in this directory in several files:
+
+- `MISSION.md`: A document capturing the _reason_ the user is interested in the topic. This should be used to ground all teaching. Use the format in [MISSION-FORMAT.md](./MISSION-FORMAT.md).
+- `./reference/*.html`: A directory of reference materials. These are the compressed learnings from the lessons - cheat sheets, reference algorithms, syntax, yoga poses, glossaries. They are the raw units of learning. They should be beautiful documents which print out well, and are designed for quick reference.
+- `RESOURCES.md`: A list of resources which can be explored to ground your teaching in contextual knowledge, or to acquire knowledge and wisdom. Use the format in [RESOURCES-FORMAT.md](./RESOURCES-FORMAT.md).
+- `./learning-records/*.md`: A directory of learning records, which capture what the user has learned. These are loosely equivalent to architectural decision records in software development - they capture non-obvious lessons and key insights that may need to be revised later, or drive future sessions. These should be used to calculate the zone of proximal development. They are titled `0001-<dash-case-name>.md`, where the number increments each time. Use the format in [LEARNING-RECORD-FORMAT.md](./LEARNING-RECORD-FORMAT.md).
+- `./lessons/*.html`: A directory of lessons. A **lesson** is a single, self-contained HTML output that teaches one tightly-scoped thing tied to the mission. This is the primary unit of teaching in this workspace.
+- `./assets/*`: Reusable **components** shared across lessons. See [Assets](#assets).
+- `NOTES.md`: A scratchpad for you to jot down user preferences, or working notes.
+
+## Philosophy
+
+To learn at a deep level, the user needs three things:
+
+- **Knowledge**, captured from high-quality, high-trust resources
+- **Skills**, acquired through highly-relevant interactive lessons devised by you, based on the knowledge
+- **Wisdom**, which comes from interacting with other learners and practitioners
+
+Before the `RESOURCES.md` is well-populated, your focus should be to find high-quality resources which will help the user acquire knowledge. Never trust your parametric knowledge.
+
+Some topics may require more skills than knowledge. Learning more about theoretical physics might be more knowledge-based. For yoga, more skills-based.
+
+### Fluency vs Storage Strength
+
+You should be careful to split between two types of learning:
+
+- **Fluency strength**: in-the-moment retrieval of knowledge
+- **Storage strength**: long-term retention of knowledge
+
+Fluency can give the user an illusory sense of mastery, but storage strength is the real goal. Try to design lessons which build long-term retention by desirable difficulty:
+
+- Using retrieval practice (recall from memory)
+- Spacing (distributing practice over time)
+- Interleaving (mixing up different but related topics in practice - for skills practice only)
+
+## Lessons
+
+A lesson is the main thing you produce: the unit in which knowledge and skills reach the user. Each lesson is one self-contained HTML file, saved to `./lessons/` and titled `0001-<dash-case-name>.html` where the number increments each time.
+
+A lesson should be **beautiful**, with clean, readable typography and layout, since the user will return to these later to review. Think Tufte.
+
+The lesson should be short, and completable very quickly. Learners' working memory is very small, and we need to stay within it. But each lesson should give the user a single tangible win that they can build on. It should be directly tied to the mission, and should be in the user's zone of proximal development.
+
+If possible, open the lesson file for the user by running a CLI command.
+
+Each lesson should link via HTML anchors to other lessons and reference documents.
+
+Each lesson should recommend a primary source for the user to read or watch. This should be the most high-quality, high-trust resource you found on the topic.
+
+Each lesson should contain a reminder to ask followup questions to the agent. The agent is their teacher, and can assist with anything that's unclear.
+
+## Assets
+
+Lessons are built from reusable **components**, stored in `./assets/`: stylesheets, quiz widgets, simulators, diagram helpers, and anything else a second lesson could reuse.
+
+Reuse is the default, not the exception. Before authoring a lesson, read `./assets/` and build from the components already there. When a lesson needs something new and reusable, write it as a component in `./assets/` and link to it; never inline code a future lesson would duplicate.
+
+A shared stylesheet is the first component every workspace earns: every lesson links it, so the lessons look like one consistent course rather than a pile of one-offs. As the workspace grows, so should the component library.
+
+## The Mission
+
+Every lesson should be tied into the mission - the reason that the user is interested in learning about the topic.
+
+If the user is unclear about the mission, or the `MISSION.md` is not populated, your first job should be to question the user on why they want to learn this.
+
+Failing to understand the mission will mean knowledge acquisition is not grounded in real-world goals. Lessons will feel too abstract. You will have no way of judging what the user should do next.
+
+Missions may change as the user develops more skills and knowledge. This is normal - make sure to update the `MISSION.md` and add a learning record to capture the change. Confirm with the user before changing the mission.
+
+## Zone Of Proximal Development
+
+Each lesson, the user should always feel as if they are being challenged 'just enough'.
+
+The user may specify an exact thing they want to learn. If they don't, figure out their zone of proximal development by:
+
+- Reading their `learning-records`
+- Figuring out the right thing to teach them based on their mission
+- Teach the most relevant thing that fits in their zone of proximal development
+
+## Knowledge
+
+Lessons should be designed around a skill the user is going to learn. The knowledge in the lesson should be only what's required to acquire that skill. You teach the knowledge first, then get the user to practice the skills via an interactive feedback loop.
+
+Knowledge should first be gathered from trusted resources. Use `RESOURCES.md` to keep track of them. Lessons should be littered with citations - links to external resources to back up any claim made. This increases the trustworthiness of the lesson.
+
+For acquiring knowledge, difficulty is the enemy. It eats working memory you need for understanding.
+
+## Skills
+
+If knowledge is all about acquisition, skills are about durability and flexibility. Make the knowledge stick.
+
+For skill acquisition, difficulty is the tool. Effortful retrieval is what builds storage strength. Skills should be taught through interactive lessons. There are several tools at your disposal:
+
+- Interactive lessons, using quizzes and light in-browser tasks
+- Lessons which guide the user through a list of real-world steps to take (for instance, yoga poses)
+
+Each of these should be based on a **feedback loop**, where the user receives feedback on their performance. This feedback loop should be as tight as possible, giving feedback immediately - and ideally automatically.
+
+For quizzes, each answer should be exactly the same number of words (and characters, if possible). Don't give the user any clues about the answer through formatting.
+
+## Acquiring Wisdom
+
+Wisdom comes from true real-world interaction - testing your skills outside the learning environment.
+
+When the user asks a question that appears to require wisdom, your default posture should be to attempt to answer - but to ultimately delegate to a **community**.
+
+A community is a place (online or offline) where the user can test their skills in the real world. This might be a forum, a subreddit, a real-world class (budget permitting) or a local interest group.
+
+You should attempt to find high-reputation communities the user can join. If the user expresses a preference that they don't want to join a community, respect it.
+
+## Reference Documents
+
+While creating lessons, you should also create reference documents. Lessons can reference these documents - they are useful for tracking raw units of knowledge useful across lessons.
+
+Lessons will rarely be revisited later - reference documents will be. They should be the compressed essence of the lesson, in a format designed for quick reference.
+
+Some learning topics lend themselves to reference:
+
+- Syntax and code snippets for programming
+- Algorithms and flowcharts for processes
+- Yoga poses and sequences for yoga
+- Exercises and routines for fitness
+- Glossaries for any topic with its own nomenclature
+
+Glossaries, in particular, are an essential reference. Once one is created, it should be adhered to in every lesson.
+
+## `NOTES.md`
+
+The user will sometimes express preferences of how they want to be taught, or things you should keep in mind. This is the place to record those preferences, so you can refer back to them when designing lessons or working with the user.
diff --git a/.agents/skills/teach/agents/openai.yaml b/.agents/skills/teach/agents/openai.yaml
new file mode 100644
index 00000000..3452a850
--- /dev/null
+++ b/.agents/skills/teach/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Teach"
+  short_description: "Learn a concept in a guided workspace"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/to-questionnaire/SKILL.md b/.agents/skills/to-questionnaire/SKILL.md
new file mode 100644
index 00000000..dadd0c00
--- /dev/null
+++ b/.agents/skills/to-questionnaire/SKILL.md
@@ -0,0 +1,54 @@
+---
+name: to-questionnaire
+description: Turn a decision you can't fully answer into a questionnaire for someone else to fill in.
+disable-model-invocation: true
+---
+
+Turn something the user can't answer alone into a **questionnaire**: a Markdown document they hand to one person to fill in async, or fill out together over a meeting. The recipient holds knowledge the user lacks; the questionnaire pulls it out of them.
+
+**Grill the send, not the subject.** Interview the user only about the _send_, which they can always answer: who it goes to, and what they need back. The questions in the document then target the **gap** between what the recipient knows and what the user needs.
+
+
+1. **Who is it going to?** Ask, in one exchange, the recipient's role, expertise, and relationship to the user. This fixes the questionnaire's tone and how much context it must carry. Done when you know who the recipient is and what they know that the user doesn't.
+
+2. **What do you need back?** Ask, in one exchange, the specific decisions or facts the user can't resolve alone and needs from this person. Done when you have a concrete list of what the user must walk away able to do or decide.
+
+3. **Write the questionnaire.** Draft questions aimed at the gap from steps 1–2, following the Document structure below. Write it to `to-questionnaire-<slug>.md` in the current directory (slug from the topic) and report the path. Done when the file exists and every item the user named in step 2 is covered by a question.
+
+## Document structure
+
+Frame the document as a **discovery questionnaire**: the user lacks context, the recipient holds it. Order questions most-important-first, since async means you may only get one pass, and group them under `##` headings by theme once there are more than a handful. Write it using the template below.
+
+<questionnaire-template>
+
+# <Questionnaire title>
+
+**Purpose:** why this questionnaire exists and the decision riding on it.
+
+**From:** <the user>, **To:** <the recipient>, **How your answers will be used:** <where they go>
+
+## Context
+
+One paragraph orienting a recipient who wasn't in the user's head. Enough to answer well, not a page.
+
+## How to answer
+
+Deadline and rough effort. Partial answers and "I don't know" are useful: flag anything you're unsure of rather than skipping it.
+
+## <Theme heading>
+
+One `##` section per theme. Under each, its questions, most-important-first. Every question is one idea, never compound, with an answer stub directly beneath, and a one-line _why this matters_ only where the question could be misread or invite a throwaway answer.
+
+<question-example>
+### What load is the system expected to handle at launch?
+
+_Why this matters: it decides whether we provision for burst traffic now or defer it._
+
+>
+</question-example>
+
+## Anything else?
+
+A closing catch-all: anything we didn't ask that we should know?
+
+</questionnaire-template>
diff --git a/.agents/skills/to-questionnaire/agents/openai.yaml b/.agents/skills/to-questionnaire/agents/openai.yaml
new file mode 100644
index 00000000..a58d1476
--- /dev/null
+++ b/.agents/skills/to-questionnaire/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "To Questionnaire"
+  short_description: "Front-load questions into a doc for someone to answer"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/to-spec/SKILL.md b/.agents/skills/to-spec/SKILL.md
new file mode 100644
index 00000000..3f52599a
--- /dev/null
+++ b/.agents/skills/to-spec/SKILL.md
@@ -0,0 +1,75 @@
+---
+name: to-spec
+description: "Turn the current conversation into a spec and publish it to the project issue tracker: no interview, just synthesis of what you've already discussed."
+disable-model-invocation: true
+---
+
+This skill takes the current conversation context and codebase understanding and produces a spec. Do NOT interview the user; just synthesize what you already know.
+
+The issue tracker and triage label vocabulary should have been provided to you. If not, tell the user to run `/setup-matt-pocock-skills`.
+
+## Process
+
+1. Explore the repo to understand the current state of the codebase, if you haven't already. Use the project's domain glossary vocabulary throughout the spec, and respect any ADRs in the area you're touching.
+
+2. Sketch out the seams at which you're going to test the feature. Existing seams should be preferred to new ones. Use the highest seam possible. If new seams are needed, propose them at the highest point you can. The fewer seams across the codebase, the better - the ideal number is one.
+
+Check with the user that these seams match their expectations.
+
+3. Write the spec using the template below, then publish it to the project issue tracker. Apply the `ready-for-agent` triage label - no need for additional triage.
+
+<spec-template>
+
+## Problem Statement
+
+The problem that the user is facing, from the user's perspective.
+
+## Solution
+
+The solution to the problem, from the user's perspective.
+
+## User Stories
+
+A LONG, numbered list of user stories. Each user story should be in the format of:
+
+1. As an <actor>, I want a <feature>, so that <benefit>
+
+<user-story-example>
+1. As a mobile bank customer, I want to see balance on my accounts, so that I can make better informed decisions about my spending
+</user-story-example>
+
+This list of user stories should be extremely extensive and cover all aspects of the feature.
+
+## Implementation Decisions
+
+A list of implementation decisions that were made. This can include:
+
+- The modules that will be built/modified
+- The interfaces of those modules that will be modified
+- Technical clarifications from the developer
+- Architectural decisions
+- Schema changes
+- API contracts
+- Specific interactions
+
+Do NOT include specific file paths or code snippets. They may end up being outdated very quickly.
+
+Exception: if a prototype produced a snippet that encodes a decision more precisely than prose can (state machine, reducer, schema, type shape), inline it within the relevant decision and note briefly that it came from a prototype. Trim to the decision-rich parts, not a working demo, just the important bits.
+
+## Testing Decisions
+
+A list of testing decisions that were made. Include:
+
+- A description of what makes a good test (only test external behavior, not implementation details)
+- Which modules will be tested
+- Prior art for the tests (i.e. similar types of tests in the codebase)
+
+## Out of Scope
+
+A description of the things that are out of scope for this spec.
+
+## Further Notes
+
+Any further notes about the feature.
+
+</spec-template>
diff --git a/.agents/skills/to-spec/agents/openai.yaml b/.agents/skills/to-spec/agents/openai.yaml
new file mode 100644
index 00000000..549e6f76
--- /dev/null
+++ b/.agents/skills/to-spec/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "To Spec"
+  short_description: "Turn a conversation into a spec"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/to-tickets/SKILL.md b/.agents/skills/to-tickets/SKILL.md
new file mode 100644
index 00000000..e868c831
--- /dev/null
+++ b/.agents/skills/to-tickets/SKILL.md
@@ -0,0 +1,105 @@
+---
+name: to-tickets
+description: Break a plan, spec, or the current conversation into a set of tracer-bullet tickets, each declaring its blocking edges, published to the configured tracker (edges as text in one file per ticket locally, or native blocking links on a real tracker).
+disable-model-invocation: true
+---
+
+# To Tickets
+
+Break a plan, spec, or conversation into a set of **tickets**: tracer-bullet vertical slices, each declaring the tickets that **block** it.
+
+The issue tracker and triage label vocabulary should have been provided to you. If not, tell the user to run `/setup-matt-pocock-skills`.
+
+## Process
+
+### 1. Gather context
+
+Work from whatever is already in the conversation context. If the user passes a reference (a spec path, an issue number or URL) as an argument, fetch it and read its full body and comments.
+
+### 2. Explore the codebase (optional)
+
+If you have not already explored the codebase, do so to understand the current state of the code. Ticket titles and descriptions should use the project's domain glossary vocabulary, and respect ADRs in the area you're touching.
+
+Look for opportunities to prefactor the code to make the implementation easier. "Make the change easy, then make the easy change."
+
+### 3. Draft vertical slices
+
+Break the work into **tracer bullet** tickets.
+
+<vertical-slice-rules>
+
+- Each slice cuts a narrow but COMPLETE path through every layer (schema, API, UI, tests): vertical, NOT a horizontal slice of one layer
+- A completed slice is demoable or verifiable on its own
+- Each slice is sized to fit in a single fresh context window
+- Any prefactoring should be done first
+
+</vertical-slice-rules>
+
+Give each ticket its **blocking edges**: the other tickets that must complete before it can start. A ticket with no blockers can start immediately.
+
+**Wide refactors are the exception to vertical slicing.** A **wide refactor** is one mechanical change (rename a column, retype a shared symbol) whose **blast radius** fans across the whole codebase, so a single edit breaks thousands of call sites at once and no vertical slice can land green. Don't force it into a tracer bullet; sequence it as **expand–contract**. First expand: add the new form beside the old so nothing breaks. Then migrate the call sites over in batches sized by blast radius (per package, per directory), each batch its own ticket blocked by the expand, keeping CI green batch to batch because the old form still exists. Finally contract: delete the old form once no caller remains, in a ticket blocked by every migrate batch. When even the batches can't stay green alone, keep the sequence but let them share an integration branch that all block a final integrate-and-verify ticket; green is promised only there.
+
+### 4. Quiz the user
+
+Present the proposed breakdown as a numbered list. For each ticket, show:
+
+- **Title**: short descriptive name
+- **Blocked by**: which other tickets (if any) must complete first
+- **What it delivers**: the end-to-end behaviour this ticket makes work
+
+Ask the user:
+
+- Does the granularity feel right? (too coarse / too fine)
+- Are the blocking edges correct: does each ticket only depend on tickets that genuinely gate it?
+- Should any tickets be merged or split further?
+
+Iterate until the user approves the breakdown.
+
+### 5. Publish the tickets to the configured tracker
+
+Publish the approved tickets. **How** depends on the tracker `/setup-matt-pocock-skills` configured; the tickets are the same either way, only the shape of the blocking edges changes:
+
+- **Local files** → write one file per ticket under `.scratch/<feature-slug>/issues/<NN>-<slug>.md`, numbered from `01` in dependency order (blockers first). Each file's "Blocked by" lists the numbers/titles it depends on. Use the per-ticket file template below: one ticket per file, never a single combined file.
+- **A real issue tracker (GitHub, Linear, …)** → publish one issue per ticket in dependency order (blockers first) so each ticket's blocking edges can reference real identifiers. Use the platform's native blocking / sub-issue relationship where it has one; otherwise set each ticket's "Blocked by" to the blocking issues. Apply the `ready-for-agent` triage label unless instructed otherwise; the tickets are agent-grabbable by construction.
+
+Work the **frontier**: any ticket whose blockers are all done. For a purely linear chain that means top to bottom.
+
+Do NOT close or modify any parent issue.
+
+<local-ticket-template>
+
+# <NN>: <Ticket title>
+
+**What to build:** the end-to-end behaviour this ticket makes work, from the user's perspective, not a layer-by-layer implementation list.
+
+**Blocked by:** the numbers/titles of the tickets that gate this one, or "None (can start immediately)".
+
+**Status:** ready-for-agent
+
+- [ ] Acceptance criterion 1
+- [ ] Acceptance criterion 2
+
+</local-ticket-template>
+
+<issue-template>
+
+## Parent
+
+A reference to the parent issue on the tracker (if the source was an existing issue, otherwise omit this section).
+
+## What to build
+
+The end-to-end behaviour this ticket makes work, from the user's perspective, not layer-by-layer implementation.
+
+## Acceptance criteria
+
+- [ ] Criterion 1
+- [ ] Criterion 2
+
+## Blocked by
+
+- A reference to each blocking ticket, or "None (can start immediately)".
+
+</issue-template>
+
+In either form, avoid specific file paths or code snippets: they go stale fast. Exception: if a prototype produced a snippet that encodes a decision more precisely than prose can (state machine, reducer, schema, type shape), inline it and note briefly that it came from a prototype. Trim to the decision-rich parts, not a working demo, just the important bits.
diff --git a/.agents/skills/to-tickets/agents/openai.yaml b/.agents/skills/to-tickets/agents/openai.yaml
new file mode 100644
index 00000000..24605a5d
--- /dev/null
+++ b/.agents/skills/to-tickets/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "To Tickets"
+  short_description: "Split a plan into tracer-bullet tickets"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/triage/AGENT-BRIEF.md b/.agents/skills/triage/AGENT-BRIEF.md
new file mode 100644
index 00000000..1462fcd9
--- /dev/null
+++ b/.agents/skills/triage/AGENT-BRIEF.md
@@ -0,0 +1,207 @@
+# Writing Agent Briefs
+
+An agent brief is a structured comment posted on a GitHub issue or PR when it moves to `ready-for-agent`. It is the authoritative specification that an AFK agent will work from. The original body and discussion are context: the agent brief is the contract.
+
+The brief states **what the agent should do**, which stretches to both surfaces: for an issue, that's building the change from nothing; for a PR, it's what's left to do *to the existing diff*: finish it, close gaps, address review points. Same principles either way; the PR example below shows the difference.
+
+## Principles
+
+### Durability over precision
+
+The issue may sit in `ready-for-agent` for days or weeks. The codebase will change in the meantime. Write the brief so it stays useful even as files are renamed, moved, or refactored.
+
+- **Do** describe interfaces, types, and behavioral contracts
+- **Do** name specific types, function signatures, or config shapes that the agent should look for or modify
+- **Don't** reference file paths: they go stale
+- **Don't** reference line numbers
+- **Don't** assume the current implementation structure will remain the same
+
+### Behavioral, not procedural
+
+Describe **what** the system should do, not **how** to implement it. The agent will explore the codebase fresh and make its own implementation decisions.
+
+- **Good:** "The `SkillConfig` type should accept an optional `schedule` field of type `CronExpression`"
+- **Bad:** "Open src/types/skill.ts and add a schedule field on line 42"
+- **Good:** "When a user runs `/triage` with no arguments, they should see a summary of issues needing attention"
+- **Bad:** "Add a switch statement in the main handler function"
+
+### Complete acceptance criteria
+
+The agent needs to know when it's done. Every agent brief must have concrete, testable acceptance criteria. Each criterion should be independently verifiable.
+
+- **Good:** "Running `gh issue list --label needs-triage` returns issues that have been through initial classification"
+- **Bad:** "Triage should work correctly"
+
+### Explicit scope boundaries
+
+State what is out of scope. This prevents the agent from gold-plating or making assumptions about adjacent features.
+
+## Template
+
+```markdown
+## Agent Brief
+
+**Category:** bug / enhancement
+**Summary:** one-line description of what needs to happen
+
+**Current behavior:**
+Describe what happens now. For bugs, this is the broken behavior.
+For enhancements, this is the status quo the feature builds on.
+
+**Desired behavior:**
+Describe what should happen after the agent's work is complete.
+Be specific about edge cases and error conditions.
+
+**Key interfaces:**
+- `TypeName`: what needs to change and why
+- `functionName()` return type: what it currently returns vs what it should return
+- Config shape: any new configuration options needed
+
+**Acceptance criteria:**
+- [ ] Specific, testable criterion 1
+- [ ] Specific, testable criterion 2
+- [ ] Specific, testable criterion 3
+
+**Out of scope:**
+- Thing that should NOT be changed or addressed in this issue
+- Adjacent feature that might seem related but is separate
+```
+
+## Examples
+
+### Good agent brief (bug)
+
+```markdown
+## Agent Brief
+
+**Category:** bug
+**Summary:** Skill description truncation drops mid-word, producing broken output
+
+**Current behavior:**
+When a skill description exceeds 1024 characters, it is truncated at exactly
+1024 characters regardless of word boundaries. This produces descriptions
+that end mid-word (e.g. "Use when the user wants to confi").
+
+**Desired behavior:**
+Truncation should break at the last word boundary before 1024 characters
+and append "..." to indicate truncation.
+
+**Key interfaces:**
+- The `SkillMetadata` type's `description` field: no type change needed,
+  but the validation/processing logic that populates it needs to respect
+  word boundaries
+- Any function that reads SKILL.md frontmatter and extracts the description
+
+**Acceptance criteria:**
+- [ ] Descriptions under 1024 chars are unchanged
+- [ ] Descriptions over 1024 chars are truncated at the last word boundary
+      before 1024 chars
+- [ ] Truncated descriptions end with "..."
+- [ ] The total length including "..." does not exceed 1024 chars
+
+**Out of scope:**
+- Changing the 1024 char limit itself
+- Multi-line description support
+```
+
+### Good agent brief (enhancement)
+
+```markdown
+## Agent Brief
+
+**Category:** enhancement
+**Summary:** Add `.out-of-scope/` directory support for tracking rejected feature requests
+
+**Current behavior:**
+When a feature request is rejected, the issue is closed with a `wontfix` label
+and a comment. There is no persistent record of the decision or reasoning.
+Future similar requests require the maintainer to recall or search for the
+prior discussion.
+
+**Desired behavior:**
+Rejected feature requests should be documented in `.out-of-scope/<concept>.md`
+files that capture the decision, reasoning, and links to all issues that
+requested the feature. When triaging new issues, these files should be
+checked for matches.
+
+**Key interfaces:**
+- Markdown file format in `.out-of-scope/`: each file should have a
+  `# Concept Name` heading, a `**Decision:**` line, a `**Reason:**` line,
+  and a `**Prior requests:**` list with issue links
+- The triage workflow should read all `.out-of-scope/*.md` files early
+  and match incoming issues against them by concept similarity
+
+**Acceptance criteria:**
+- [ ] Closing a feature as wontfix creates/updates a file in `.out-of-scope/`
+- [ ] The file includes the decision, reasoning, and link to the closed issue
+- [ ] If a matching `.out-of-scope/` file already exists, the new issue is
+      appended to its "Prior requests" list rather than creating a duplicate
+- [ ] During triage, existing `.out-of-scope/` files are checked and surfaced
+      when a new issue matches a prior rejection
+
+**Out of scope:**
+- Automated matching (human confirms the match)
+- Reopening previously rejected features
+- Bug reports (only enhancement rejections go to `.out-of-scope/`)
+```
+
+### Good agent brief (PR)
+
+For a PR, "Current behavior" describes the state of the diff, and the brief asks the agent to finish or fix it rather than build from scratch.
+
+```markdown
+## Agent Brief
+
+**Category:** enhancement
+**Summary:** Finish the contributor's `--json` output flag for `triage list`
+
+**Current behavior:**
+The PR adds a `--json` flag that serializes the issue list to JSON. The happy
+path works and the diff matches the project's command structure. Two gaps
+remain: errors are still printed as human text (not JSON), and the new flag has
+no test coverage.
+
+**Desired behavior:**
+With `--json`, all output (including errors) is well-formed JSON on stdout,
+and the command's exit codes are unchanged. The existing human-readable output
+is untouched when the flag is absent.
+
+**Key interfaces:**
+- The command's error path should emit `{ "error": string }` under `--json`
+  instead of the plain-text error
+- Reuse the existing serializer the PR already added; don't introduce a second
+
+**Acceptance criteria:**
+- [ ] `triage list --json` emits valid JSON for both success and error cases
+- [ ] Exit codes match the non-JSON command
+- [ ] A test covers the `--json` success output and one error case
+- [ ] Default (non-JSON) output is byte-for-byte unchanged
+
+**Out of scope:**
+- Adding `--json` to any other command
+- Changing the JSON shape of the success payload the PR already defined
+```
+
+### Bad agent brief
+
+```markdown
+## Agent Brief
+
+**Summary:** Fix the triage bug
+
+**What to do:**
+The triage thing is broken. Look at the main file and fix it.
+The function around line 150 has the issue.
+
+**Files to change:**
+- src/triage/handler.ts (line 150)
+- src/types.ts (line 42)
+```
+
+This is bad because:
+- No category
+- Vague description ("the triage thing is broken")
+- References file paths and line numbers that will go stale
+- No acceptance criteria
+- No scope boundaries
+- No description of current vs desired behavior
diff --git a/.agents/skills/triage/OUT-OF-SCOPE.md b/.agents/skills/triage/OUT-OF-SCOPE.md
new file mode 100644
index 00000000..c9fba2f7
--- /dev/null
+++ b/.agents/skills/triage/OUT-OF-SCOPE.md
@@ -0,0 +1,105 @@
+# Out-of-Scope Knowledge Base
+
+The `.out-of-scope/` directory in a repo stores persistent records of rejected feature requests. It serves two purposes:
+
+1. **Institutional memory**: why a feature was rejected, so the reasoning isn't lost when the issue is closed
+2. **Deduplication**: when a new issue comes in that matches a prior rejection, the skill can surface the previous decision instead of re-litigating it
+
+## Directory structure
+
+```
+.out-of-scope/
+├── dark-mode.md
+├── plugin-system.md
+└── graphql-api.md
+```
+
+One file per **concept**, not per issue. Multiple issues requesting the same thing are grouped under one file.
+
+## File format
+
+The file should be written in a relaxed, readable style, more like a short design document than a database entry. Use paragraphs, code samples, and examples to make the reasoning clear and useful to someone encountering it for the first time.
+
+```markdown
+# Dark Mode
+
+This project does not support dark mode or user-facing theming.
+
+## Why this is out of scope
+
+The rendering pipeline assumes a single color palette defined in
+`ThemeConfig`. Supporting multiple themes would require:
+
+- A theme context provider wrapping the entire component tree
+- Per-component theme-aware style resolution
+- A persistence layer for user theme preferences
+
+This is a significant architectural change that doesn't align with the
+project's focus on content authoring. Theming is a concern for downstream
+consumers who embed or redistribute the output.
+
+```ts
+// The current ThemeConfig interface is not designed for runtime switching:
+interface ThemeConfig {
+  colors: ColorPalette; // single palette, resolved at build time
+  fonts: FontStack;
+}
+```
+
+## Prior requests
+
+- #42: "Add dark mode support"
+- #87: "Night theme for accessibility"
+- #134: "Dark theme option"
+```
+
+### Naming the file
+
+Use a short, descriptive kebab-case name for the concept: `dark-mode.md`, `plugin-system.md`, `graphql-api.md`. The name should be recognizable enough that someone browsing the directory understands what was rejected without opening the file.
+
+### Writing the reason
+
+The reason should be substantive: not "we don't want this" but why. Good reasons reference:
+
+- Project scope or philosophy ("This project focuses on X; theming is a downstream concern")
+- Technical constraints ("Supporting this would require Y, which conflicts with our Z architecture")
+- Strategic decisions ("We chose to use A instead of B because...")
+
+The reason should be durable. Avoid referencing temporary circumstances ("we're too busy right now"); those aren't real rejections, they're deferrals.
+
+## When to check `.out-of-scope/`
+
+During triage (Step 1: Gather context), read all files in `.out-of-scope/`. When evaluating a new issue:
+
+- Check if the request matches an existing out-of-scope concept
+- Matching is by concept similarity, not keyword: "night theme" matches `dark-mode.md`
+- If there's a match, surface it to the maintainer: "This is similar to `.out-of-scope/dark-mode.md`. We rejected this before because [reason]. Do you still feel the same way?"
+
+The maintainer may:
+
+- **Confirm**: the new issue gets added to the existing file's "Prior requests" list, then closed
+- **Reconsider**: the out-of-scope file gets deleted or updated, and the issue proceeds through normal triage
+- **Disagree**: the issues are related but distinct, proceed with normal triage
+
+## When to write to `.out-of-scope/`
+
+Only when an **enhancement** (not a bug) is *rejected* as `wontfix`. This applies to enhancement PRs exactly as it does to issues: a rejected PR is recorded here so the same request doesn't return as fresh code.
+
+Do **not** write here when something is closed as `wontfix` because it's **already implemented**. That's a built feature, not a rejected one; recording it would poison the dedup checks with false rejections. Instead, the closing comment points to where the feature already lives.
+
+The flow:
+
+1. Maintainer decides a feature request is out of scope
+2. Check if a matching `.out-of-scope/` file already exists
+3. If yes: append the new issue to the "Prior requests" list
+4. If no: create a new file with the concept name, decision, reason, and first prior request
+5. Post a comment on the issue explaining the decision and mentioning the `.out-of-scope/` file
+6. Close the issue with the `wontfix` label
+
+## Updating or removing out-of-scope files
+
+If the maintainer changes their mind about a previously rejected concept:
+
+- Delete the `.out-of-scope/` file
+- The skill does not need to reopen old issues; they're historical records
+- The new issue that triggered the reconsideration proceeds through normal triage
diff --git a/.agents/skills/triage/SKILL.md b/.agents/skills/triage/SKILL.md
new file mode 100644
index 00000000..37ddea1e
--- /dev/null
+++ b/.agents/skills/triage/SKILL.md
@@ -0,0 +1,112 @@
+---
+name: triage
+description: Move issues and external PRs through a state machine of triage roles, categorise, verify, grill if needed, and write agent-ready briefs.
+disable-model-invocation: true
+---
+
+# Triage
+
+Move issues on the project issue tracker through a small state machine of triage roles.
+
+If this repo treats external pull requests as a request surface (see the issue-tracker config), triage covers them too: **a PR is an issue with attached code**, using the same roles, same states, and same machine, with a few deltas marked "for a PR" below. Resolve a bare `#42` to an issue or PR per the tracker config.
+
+Every comment or issue posted to the issue tracker during triage **must** start with this disclaimer:
+
+```
+> *This was generated by AI during triage.*
+```
+
+## Reference docs
+
+- [AGENT-BRIEF.md](AGENT-BRIEF.md): how to write durable agent briefs
+- [OUT-OF-SCOPE.md](OUT-OF-SCOPE.md): how the `.out-of-scope/` knowledge base works
+
+## Roles
+
+Two **category** roles:
+
+- `bug`: something is broken
+- `enhancement`: new feature or improvement
+
+Five **state** roles:
+
+- `needs-triage`: maintainer needs to evaluate
+- `needs-info`: waiting on reporter for more information
+- `ready-for-agent`: fully specified, ready for an AFK agent
+- `ready-for-human`: needs human implementation
+- `wontfix`: will not be actioned
+
+For a PR, the same states read against the attached code: `ready-for-agent` means a brief is attached and an agent should take the next step on the diff; `ready-for-human` means it's ready for a human to merge.
+
+Every triaged issue should carry exactly one category role and one state role. If state roles conflict, flag it and ask the maintainer before doing anything else.
+
+These are canonical role names. The actual label strings used in the issue tracker may differ. The mapping should have been provided to you. If not, tell the user to run `/setup-matt-pocock-skills`.
+
+State transitions: an unlabeled issue normally goes to `needs-triage` first; from there it moves to `needs-info`, `ready-for-agent`, `ready-for-human`, or `wontfix`. `needs-info` returns to `needs-triage` once the reporter replies. The maintainer can override at any time; flag transitions that look unusual and ask before proceeding.
+
+## Invocation
+
+The maintainer invokes `/triage` and describes what they want in natural language. Interpret the request and act. Examples:
+
+- "Show me anything that needs my attention"
+- "Let's look at #42" (issue or PR)
+- "Move #42 to ready-for-agent"
+- "What's ready for agents to pick up?"
+
+## Show what needs attention
+
+Query the issue tracker and present three buckets, oldest first:
+
+1. **Unlabeled**: never triaged.
+2. **`needs-triage`**: evaluation in progress.
+3. **`needs-info` with reporter activity since the last triage notes**: needs re-evaluation.
+
+When PRs are in scope, include external PRs in these buckets and tag each line `[PR]` or `[issue]`. Discovery surfaces only *external* PRs (the tracker config defines who counts as external), so a collaborator's in-flight PR is not triage work. This filter is discovery-only; an explicitly named PR is always triaged regardless of author.
+
+Show counts and a one-line summary per item. Let the maintainer pick.
+
+## Triage a specific issue or PR
+
+1. **Gather context.** Read the full issue or PR (body, comments, labels, author, dates; for a PR, the diff too). Parse any prior triage notes so you don't re-ask resolved questions. Explore the codebase using the project's domain glossary, respecting ADRs in the area. Run two checks against the codebase: (a) **redundancy**: search for an existing implementation of the requested behavior by domain concept (not just the request's wording), and report where you looked. If found, it's an already-implemented `wontfix` (step 5). (b) **prior rejection**: read `.out-of-scope/*.md` and surface any that resembles this request.
+
+2. **Recommend.** Tell the maintainer your category and state recommendation with reasoning, plus a brief codebase summary relevant to the request (including whether it's already implemented). Wait for direction.
+
+3. **Verify the claim.** Before any grilling, check that the claim holds up. For a bug, reproduce it from the reporter's steps. For a PR, confirm the diff does what it claims: check it out, run the relevant tests or commands. Report what happened: confirmed (with code path), failed, or insufficient detail (a strong `needs-info` signal). A confirmed verification makes a much stronger agent brief.
+
+4. **Grill (if needed).** If the request needs fleshing out, call the Skill tool twice, for "grilling" and "domain-modeling", and grill it into shape a round of questions at a time, sharpening domain terms and updating `CONTEXT.md`/ADRs inline as decisions land.
+
+5. **Apply the outcome:**
+   - `ready-for-agent`: post an agent brief comment ([AGENT-BRIEF.md](AGENT-BRIEF.md)).
+   - `ready-for-human`: same structure as an agent brief, but note why it can't be delegated (judgment calls, external access, design decisions, manual testing).
+   - `needs-info`: post triage notes (template below).
+   - For `wontfix`, close the issue, with the comment depending on *why*:
+     - **Already implemented**: the change already exists in the codebase. Point to where it lives; do **not** write to `.out-of-scope/` (that KB is for *rejected* requests, not built ones).
+     - **Rejected (bug)**: give a polite explanation, then close.
+     - **Rejected (enhancement)**: write to `.out-of-scope/`, link to it from a comment, then close ([OUT-OF-SCOPE.md](OUT-OF-SCOPE.md)).
+   - `needs-triage`: apply the role. Optional comment if there's partial progress.
+
+## Quick state override
+
+If the maintainer says "move #42 to ready-for-agent", trust them and apply the role directly. Confirm what you're about to do (role changes, comment, close), then act. Skip grilling. If moving to `ready-for-agent` without a grilling session, ask whether they want to write an agent brief.
+
+## Needs-info template
+
+```markdown
+## Triage Notes
+
+**What we've established so far:**
+
+- point 1
+- point 2
+
+**What we still need from you (@reporter):**
+
+- question 1
+- question 2
+```
+
+Capture everything resolved during grilling under "established so far" so the work isn't lost. Questions must be specific and actionable, not "please provide more info".
+
+## Resuming a previous session
+
+If prior triage notes exist on the issue or PR, read them, check whether the reporter has answered any outstanding questions, and present an updated picture before continuing. Don't re-ask resolved questions.
diff --git a/.agents/skills/triage/agents/openai.yaml b/.agents/skills/triage/agents/openai.yaml
new file mode 100644
index 00000000..acb366cf
--- /dev/null
+++ b/.agents/skills/triage/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Triage"
+  short_description: "Move issues through triage roles"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/wait-what/SKILL.md b/.agents/skills/wait-what/SKILL.md
new file mode 100644
index 00000000..f8854f1b
--- /dev/null
+++ b/.agents/skills/wait-what/SKILL.md
@@ -0,0 +1,7 @@
+---
+name: wait-what
+description: "Stop. That last message did not land: re-pitch it."
+disable-model-invocation: true
+---
+
+Wait, I don't understand where you've got to here. Re-pitch that: give me a little bit of context, talk in ASD-STE100 Simplified Technical English, and use the ubiquitous language from `CONTEXT.md` (follow `CONTEXT-MAP.md` to the right one if the repo has more than one).
diff --git a/.agents/skills/wait-what/agents/openai.yaml b/.agents/skills/wait-what/agents/openai.yaml
new file mode 100644
index 00000000..6f7a9c33
--- /dev/null
+++ b/.agents/skills/wait-what/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Wait What"
+  short_description: "Re-pitch that: simpler, with the context I'm missing"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/wayfinder/SKILL.md b/.agents/skills/wayfinder/SKILL.md
new file mode 100644
index 00000000..812805b7
--- /dev/null
+++ b/.agents/skills/wayfinder/SKILL.md
@@ -0,0 +1,128 @@
+---
+name: wayfinder
+description: Plan a huge chunk of work (more than one agent session can hold) as a shared map of decision tickets on your issue tracker, and resolve them one at a time until the way to the destination is clear.
+disable-model-invocation: true
+---
+
+A loose idea has arrived, too big for one agent session, and wrapped in fog: the way from here to the **destination** isn't visible yet. Wayfinding is about finding that way, not charging at the destination. This skill charts the way as a **shared map** on the repo's issue tracker, then works its **decision tickets** (questions whose resolution is a decision, not slices of a build to execute) one at a time until the route is clear.
+
+The destination varies per effort, and naming it is the first act of charting: it shapes every ticket. It might be a spec to hand off and iterate on, a decision to lock before planning starts, or a change made in place like a data-structure migration. The map is domain-agnostic: engineering work, course content, whatever fits the shape.
+
+## Plan, don't do
+
+Wayfinder is **planning** by default: each ticket resolves a decision, and the map is done when the way is clear, with nothing left to decide before someone goes and does the thing. The pull to just do the work is usually the signal you've reached the edge of the map and it's time to hand off. An effort can override this in its **Notes**, carrying execution into the map itself, but absent that, produce decisions, not deliverables.
+
+## Refer by name
+
+Every map and ticket is an issue, so it has a **name**: its title. In everything the human reads (narration, the map's Decisions-so-far), refer to it by that name, never by a bare id, number, or slug. A wall of `#42, #43, #44` is illegible; names read at a glance. The id and URL don't vanish; a name wraps its link, but they ride _inside_ the name, never stand in for it.
+
+## The Map
+
+The map is a single issue on this repo's issue tracker, labelled `wayfinder:map`, the canonical artifact. Its tickets are child issues of the map.
+
+The map is an **index**, not a store. It lists the decisions made and points at the tickets that hold their detail; a decision lives in exactly one place, its ticket, so the map never restates it, only gists it and links.
+
+**Where the map, its child tickets, blocking, and frontier queries physically live is tracker-specific.** The issue tracker should have been provided to you. If not, tell the user to run `/setup-matt-pocock-skills`. Consult the tracker doc's "Wayfinding operations" section for how _this_ repo expresses them. If no tracker has been provided, default to the local-markdown tracker.
+
+### The map body
+
+The whole map at low resolution, loaded once per session. Open tickets are **not** listed: they are open child issues, found by query.
+
+```markdown
+## Destination
+
+<what reaching the end of this map looks like: the spec, decision, or change this effort is finding its way to. One or two lines; every session orients to it before choosing a ticket.>
+
+## Notes
+
+<domain; skills every session should consult; standing preferences for this effort>
+
+## Decisions so far
+
+<!-- the index: one line per closed ticket, enough to judge relevance, then zoom the link for the detail the ticket holds -->
+
+- [<closed ticket title>](link): <one-line gist of the answer>
+
+## Not yet specified
+
+<!-- see "Fog of war": in-scope fog you can't ticket yet; graduates as the frontier advances -->
+
+## Out of scope
+
+<!-- see "Out of scope": work ruled beyond the destination; closed, never graduates -->
+```
+
+### Tickets
+
+Each ticket is a **child issue** of the map; the tracker's issue id is its identity. Its body is the question, sized to one 100K token agent session:
+
+```markdown
+## Question
+
+<the decision or investigation this ticket resolves>
+```
+
+Each ticket carries a `wayfinder:<type>` label, one of `research`, `prototype`, `grilling`, `task` (see [Ticket Types](#ticket-types)).
+
+A session **claims** a ticket by assigning it to the dev driving the map, **first**, before any work, so concurrent sessions skip it. That assignee _is_ the claim: an open, unassigned ticket is unclaimed.
+
+Blocking uses the tracker's **native** dependency relationship: essential because it renders the frontier _visually_ in the tracker's own UI, so the human sees what's takeable without opening the map. Only a tracker that lacks native blocking falls back to a body convention. A ticket is **unblocked** when every ticket blocking it is closed; the **frontier** is the open, unblocked, unclaimed children, the edge of the known.
+
+The answer isn't part of the body; it's recorded on resolution (see [Work through the map](#work-through-the-map)). Assets created while resolving a ticket are linked from the issue, not pasted in.
+
+## Ticket Types
+
+Every ticket is either **HITL** (human in the loop, worked _with_ a human who speaks for themselves) or **AFK**, driven by the agent alone. A HITL ticket only resolves through that live exchange; the agent never stands in for the human's side of it (a grilling agent that answers its own questions has broken this).
+
+- **Research** (AFK): Reading documentation, third-party APIs, or local resources like knowledge bases to surface a fact a decision waits on. Resolved by a subagent that calls the Skill tool with "research". Use when knowledge outside the current working directory is required.
+- **Prototype** (HITL): Raise the fidelity of the discussion by making a cheap, rough, concrete artifact to react to (an outline, a rough take, a stub, or UI/logic code) by calling the Skill tool with "prototype". Links the prototype as an asset. Use when "how should it look" or "how should it behave" is the key question.
+- **Grilling** (HITL): Conversation. The default case. Always call the Skill tool twice, for "grilling" and "domain-modeling".
+- **Task** (HITL or AFK): Manual work that must happen before a _decision_ can be made: nothing to decide, prototype, or research, but the discussion is blocked until it's done. Signing up for a service so its API can be judged, provisioning access, moving data so its shape can be seen. This is the one type that _does_ rather than decides, and it earns its place by unblocking a decision, not by delivering the destination. The agent drives it alone where it can (AFK); otherwise it hands the human a precise checklist (HITL). Resolved when the work is done; the answer records what was done and any resulting facts (credentials location, new URLs, row counts) later tickets depend on.
+
+## Fog of war
+
+The map is _deliberately_ incomplete: don't chart what you can't yet see. Beyond the live tickets lies the **fog of war**: the dim view of decisions and investigations you can tell are coming but can't yet pin down, because they hang on questions still open. Resolving a ticket clears the fog ahead of it, graduating whatever's now specifiable into fresh tickets, one at a time, until the way to the destination is clear and no tickets remain.
+
+The map's **Not yet specified** section is where that dim view is written down: the suspected question, the area to revisit later. It's the undiscovered frontier _toward_ the destination: everything here is in scope, just not sharp enough to ticket. Write as loosely or as fully as the view allows; it doubles as a signpost for collaborators reading where the effort is headed.
+
+**Fog or ticket?** The test is whether you can state the question precisely now, _not_ whether you can answer it now.
+
+- **Ticket when** the question is already sharp, even if it's blocked and you can't act on it yet.
+- **Not yet specified when** you can't yet phrase it that sharply. Don't pre-slice the fog into ticket-sized pieces: it's coarser than a ticket, and one patch may graduate into several tickets, or none, once the frontier reaches it.
+
+**Not yet specified** excludes what's already decided (Decisions so far), what's already a live ticket, and what's out of scope (the next section).
+
+## Out of scope
+
+Fog only ever gathers _toward_ the destination. The destination fixes the scope, so work beyond it is **out of scope**: it isn't fog, and it doesn't belong in **Not yet specified**. It gets its own **Out of scope** section on the map: work you've consciously ruled out of _this_ effort. Scope, not sharpness, lands it here.
+
+Out-of-scope work never graduates (the frontier stops at the destination), so it returns only if the destination is redrawn, and then as a fresh effort, not a resumption.
+
+Ruling something out of scope is a scoping act, not a step on the route. When a ticket that already exists turns out to sit past the destination (mis-scoped in while charting, or exposed by a resolution), **close it** (a closed ticket is unambiguously off the frontier) and leave one line in the **Out of scope** section: the gist plus why it's out of scope, linking the closed ticket. It stays out of **Decisions so far**, which records the route actually walked; a scope boundary isn't a step on it.
+
+## Invocation
+
+Two modes. Either way, **never resolve more than one ticket per session**, with the exception of research tickets.
+
+### Chart the map
+
+User invokes with a loose idea.
+
+1. **Name the destination.** Call the Skill tool twice, for "grilling" and "domain-modeling", to pin down what this map is finding its way to: the spec, decision, or change. The destination fixes the scope, so it's settled first.
+2. **Map the frontier.** Grill again, **breadth-first** this time: fan out across the whole space rather than deep on any one thread, surfacing the open decisions and the first steps takeable now. **If this surfaces no fog** (the way to the destination is already clear, the whole journey small enough for one session), you don't need a map. Stop and ask the user how they'd like to proceed.
+3. **Create the map** (label `wayfinder:map`): Destination and Notes filled in, Decisions-so-far empty, the fog sketched into **Not yet specified**.
+4. **Create the tickets you can specify now** as child issues of the map, then wire blocking edges in a **second pass** (issues need ids before they can reference each other). Wiring sorts them into the frontier and the blocked; everything you can't yet specify stays in the fog: the **Not yet specified** section.
+5. **Fire the research subagents.** For each `research` ticket you just created, spin up a subagent that calls the Skill tool with "research" to resolve it in parallel, capturing its findings on a throwaway `research/<name>` branch with a context pointer from the ticket.
+6. Stop: charting is one session's work; it hand-resolves nothing.
+
+### Work through the map
+
+User invokes with a map (URL or number). A ticket is **optional**: without one, you pick the next decision, not the user.
+
+1. Load the **map**: the low-res view, not every ticket body.
+2. Choose the ticket. If the user named one, use it. Otherwise take the first frontier ticket in order. **Claim it**: assign it to yourself before any work.
+3. Resolve it. **Zoom as needed**: fetch the full body of any related or closed ticket on demand; call the Skill tool for whichever skills the `## Notes` block names. If in doubt, call the Skill tool twice, for "grilling" and "domain-modeling".
+4. Record the resolution: post the answer as a **resolution comment**, **close** the issue, and **append a context pointer** to the map's Decisions-so-far.
+5. Add newly-surfaced tickets (create-then-wire); graduate any fog the answer has made specifiable, clearing each graduated patch from **Not yet specified** so it lives only as its new ticket. If the answer reveals that a ticket (this one or another) sits beyond the destination, **rule it out of scope** rather than resolving it on the route. If the decision invalidates other parts of the map, update or delete those tickets.
+
+The user may run unblocked tickets in parallel, so expect other sessions to be editing the tracker concurrently.
diff --git a/.agents/skills/wayfinder/agents/openai.yaml b/.agents/skills/wayfinder/agents/openai.yaml
new file mode 100644
index 00000000..b3754475
--- /dev/null
+++ b/.agents/skills/wayfinder/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Wayfinder"
+  short_description: "Map a large effort as decision tickets"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/wizard/SKILL.md b/.agents/skills/wizard/SKILL.md
new file mode 100644
index 00000000..c4294ad8
--- /dev/null
+++ b/.agents/skills/wizard/SKILL.md
@@ -0,0 +1,44 @@
+---
+name: wizard
+description: Generate an interactive bash wizard that walks a human through steps only they can perform. Use when provisioning infrastructure, setting up credentials or CI secrets, walking an unfamiliar third-party dashboard, or running a one-off migration or cutover. Don't invoke this for steps the agent can perform itself.
+---
+
+# Wizard
+
+A **wizard** is a bash script that walks a human, step by step, through a manual procedure that's tedious to do by hand and tedious to re-explain to an AI every time. It opens each URL, says exactly what to click and copy, captures the values, writes them where they belong (`.env`, GitHub secrets), confirms at every stage, and shows how many stages are left. It might configure third-party services, run a one-off migration, or move the project from one state to another.
+
+The delightful UX is already solved by [template.sh](template.sh): stage-by-stage progress, confirmation gates, cross-platform URL opening (including WSL), hidden secret entry, idempotent `.env` upserts, `gh secret`/`gh variable` writes, and a closing summary. **Your job is only to scope the procedure and author its stages.** The library above the `STAGES` marker is identical in every wizard; that consistency is the point: never hand-edit it.
+
+A wizard is ephemeral by default: built for one run, saved to a scratch or `scripts/` path, deleted when the job's done. Commit it only when the user wants a repeatable setup path that should live in the repo.
+
+## Process
+
+### 1. Scope the procedure
+
+Work out every manual step the human must take and every value that gets captured along the way. Read the repo first, don't ask cold:
+
+- For setup: `.env`, `.env.example`, `.env.*`, `README`, `docker-compose*`, framework config, and `.github/workflows/*` (every `secrets.*` / `vars.*` reference is a value the wizard must produce).
+- For a migration or transition: the current state, the target state, and the irreversible actions between them.
+
+Then show the user the ordered list of stages and the values each produces, and confirm: they may add, drop, or reorder.
+
+**Done when:** every stage is named in order, and for each captured value you know (a) where the human gets it, (b) where it's written (`.env`, a GitHub secret, both, or nowhere; some stages are pure actions), and (c) whether it's secret (hidden entry) or public.
+
+### 2. Map each stage's journey
+
+For each stage, write the precise path a human follows: which URL to open, what to do there, where a value is shown, which variable it fills: e.g. "Dashboard → Developers → API keys → Reveal test key → copy". Where you don't actually know the current UI or the exact command, say so and ask the user or check the docs: never invent steps that may not exist.
+
+**Done when:** every stage traces to concrete instructions a stranger could follow.
+
+### 3. Author the wizard
+
+Copy `template.sh` to the target path. Replace the example stage with one `stage` per step, in dependency order. Use the library helpers: `stage`, `say`/`step`, `open_url`, `ask`/`ask_secret`, `write_env`, `set_secret`/`set_var`, `pause`/`confirm`. Set `TOTAL_STAGES` to the number of stages you wrote.
+
+Hold the bar the template sets: open the URL before asking for its value, use `ask_secret` for anything secret, `write_env` every persisted value, `set_secret` only the values CI actually needs, and `confirm` before any irreversible action. Each `stage` clears the screen so only the current step is visible: keep a stage to one focused task so nothing the human needs scrolls away. Don't touch the library above the marker.
+
+### 4. Verify and hand off
+
+- `bash -n <script>`; run `shellcheck` if available.
+- `chmod +x <script>`.
+- Don't run it end-to-end yourself: it opens browsers and blocks on human input. Trace it statically instead: every value from step 1 is captured and lands where step 1 said, and every `set_secret` name exactly matches a `secrets.*` reference in CI.
+- Tell the user how to run it. If it's a repeatable setup path, commit it and link it from the README so the next person runs the script instead of asking an AI.
diff --git a/.agents/skills/wizard/agents/openai.yaml b/.agents/skills/wizard/agents/openai.yaml
new file mode 100644
index 00000000..b601bdf3
--- /dev/null
+++ b/.agents/skills/wizard/agents/openai.yaml
@@ -0,0 +1,3 @@
+interface:
+  display_name: "Wizard"
+  short_description: "Generate an interactive setup wizard"
diff --git a/.agents/skills/wizard/template.sh b/.agents/skills/wizard/template.sh
new file mode 100644
index 00000000..1b3cdf40
--- /dev/null
+++ b/.agents/skills/wizard/template.sh
@@ -0,0 +1,204 @@
+#!/usr/bin/env bash
+#
+# A wizard walks a human through a manual procedure, step by step.
+# Generated by the /wizard skill.
+#
+# Everything above the "STAGES" marker is the wizard library: do not hand-edit
+# it. Author the per-step stages below the marker.
+
+set -euo pipefail
+
+# ──────────────────────────────────────────────────────────────────────────
+# Wizard library: delightful, consistent UX, identical across every wizard.
+# ──────────────────────────────────────────────────────────────────────────
+
+if [[ -t 1 ]] && command -v tput >/dev/null 2>&1 && [[ "$(tput colors 2>/dev/null || echo 0)" -ge 8 ]]; then
+  BOLD=$(tput bold); DIM=$(tput dim); RESET=$(tput sgr0)
+  BLUE=$(tput setaf 4); GREEN=$(tput setaf 2); YELLOW=$(tput setaf 3); RED=$(tput setaf 1)
+else
+  BOLD=""; DIM=""; RESET=""; BLUE=""; GREEN=""; YELLOW=""; RED=""
+fi
+
+# Author sets this at the top of the stages section.
+TOTAL_STAGES=0
+
+_STAGE_INDEX=0
+ENV_FILE="${ENV_FILE:-.env}"
+WRITTEN_ENV=()    # KEYs written to ENV_FILE this run
+WRITTEN_SECRET=() # secret NAMEs set this run
+SKIPPED=()        # things we couldn't do (e.g. gh missing)
+
+# _clear wipes the terminal so only the current step is on screen. No-op when
+# output isn't a terminal, so piped logs stay readable.
+_clear() {
+  [[ -t 1 ]] || return 0
+  if command -v tput >/dev/null 2>&1; then tput clear; else printf '\033[2J\033[3J\033[H'; fi
+}
+
+# banner "Title" shows the opening frame: what this wizard does.
+banner() {
+  _clear
+  printf '\n%s%s  %s%s\n' "$BOLD" "$BLUE" "$1" "$RESET"
+  printf '%s  %s stages%s\n\n' "$DIM" "$TOTAL_STAGES" "$RESET"
+  printf '%s  You drive the browser; this wizard tells you exactly what to do and\n' "$DIM"
+  printf '  captures the values you copy back. Stop any time with Ctrl-C and re-run\n'
+  printf '  later, since it remembers values already saved.%s\n' "$RESET"
+  pause "Ready to start?"
+}
+
+# stage "Name" clears the screen, then announces a stage and shows progress.
+# Clearing keeps only the current step on screen.
+stage() {
+  _clear
+  _STAGE_INDEX=$((_STAGE_INDEX + 1))
+  printf '\n%s%s▸ Stage %s/%s · %s%s\n' \
+    "$BOLD" "$BLUE" "$_STAGE_INDEX" "$TOTAL_STAGES" "$1" "$RESET"
+}
+
+# say "..." prints a plain instruction line.
+say()  { printf '  %s\n' "$1"; }
+# step "..." is a numbered-feeling action the human takes in the browser.
+step() { printf '  %s•%s %s\n' "$BLUE" "$RESET" "$1"; }
+note() { printf '  %s%s%s\n' "$DIM" "$1" "$RESET"; }
+warn() { printf '  %s⚠ %s%s\n' "$YELLOW" "$1" "$RESET"; }
+
+# open_url URL opens it in the human's browser, cross-platform incl. WSL.
+open_url() {
+  local url="$1"
+  printf '  %s↗ opening%s %s\n' "$GREEN" "$RESET" "$url"
+  { if   command -v wslview     >/dev/null 2>&1; then wslview "$url"
+    elif command -v explorer.exe >/dev/null 2>&1; then explorer.exe "$url"
+    elif command -v xdg-open    >/dev/null 2>&1; then xdg-open "$url"
+    elif command -v open        >/dev/null 2>&1; then open "$url"
+    else warn "couldn't open a browser; visit it manually: $url"; fi
+  } >/dev/null 2>&1 || warn "couldn't open a browser, so visit it manually: $url"
+}
+
+# pause "msg" waits for the human to confirm they've done the manual part.
+pause() {
+  printf '  %s%s%s ' "$DIM" "${1:-Press Enter to continue}" "$RESET"
+  read -r _ || true
+}
+
+# confirm "question" is a y/N gate; returns success on yes.
+confirm() {
+  local reply=""
+  printf '  %s? %s [y/N] ' "$YELLOW" "$1"
+  read -r reply || true
+  [[ "$reply" =~ ^[Yy] ]]
+}
+
+# _existing KEY: current value of KEY in ENV_FILE, if any.
+_existing() {
+  [[ -f "$ENV_FILE" ]] || return 1
+  local line; line=$(grep -E "^${1}=" "$ENV_FILE" | tail -n1) || return 1
+  printf '%s' "${line#*=}"
+}
+
+# ask KEY "Prompt" reads a value into $KEY. Offers the existing .env value as
+# a default on re-runs (Enter keeps it). Visible input (non-secret).
+ask() {
+  local key="$1" prompt="$2" current input
+  current=$(_existing "$key" || true)
+  if [[ -n "$current" ]]; then
+    printf '  %s%s%s %s[Enter keeps current]%s ' "$BOLD" "$prompt" "$RESET" "$DIM" "$RESET"
+  else
+    printf '  %s%s%s ' "$BOLD" "$prompt" "$RESET"
+  fi
+  read -r input || true
+  [[ -z "$input" && -n "$current" ]] && input="$current"
+  printf -v "$key" '%s' "$input"
+}
+
+# ask_secret KEY "Prompt" is like ask, but input is hidden.
+ask_secret() {
+  local key="$1" prompt="$2" current input
+  current=$(_existing "$key" || true)
+  if [[ -n "$current" ]]; then
+    printf '  %s%s%s %s[Enter keeps current]%s ' "$BOLD" "$prompt" "$RESET" "$DIM" "$RESET"
+  else
+    printf '  %s%s%s ' "$BOLD" "$prompt" "$RESET"
+  fi
+  read -rs input || true
+  printf '\n'
+  [[ -z "$input" && -n "$current" ]] && input="$current"
+  printf -v "$key" '%s' "$input"
+}
+
+# write_env KEY VALUE upserts KEY=VALUE into ENV_FILE (creates it; replaces
+# any existing line). Idempotent.
+write_env() {
+  local key="$1" value="$2" tmp
+  touch "$ENV_FILE"
+  tmp=$(mktemp)
+  grep -vE "^${key}=" "$ENV_FILE" > "$tmp" || true
+  printf '%s=%s\n' "$key" "$value" >> "$tmp"
+  mv "$tmp" "$ENV_FILE"
+  WRITTEN_ENV+=("$key")
+  printf '  %s✓ wrote%s %s → %s\n' "$GREEN" "$RESET" "$key" "$ENV_FILE"
+}
+
+# set_secret NAME VALUE sets a GitHub Actions repo secret via gh. Falls back
+# to a warning (and records it) if gh is unavailable or unauthenticated.
+set_secret() {
+  local name="$1" value="$2"
+  if command -v gh >/dev/null 2>&1 && gh auth status >/dev/null 2>&1; then
+    if printf '%s' "$value" | gh secret set "$name" >/dev/null 2>&1; then
+      WRITTEN_SECRET+=("$name")
+      printf '  %s✓ set%s GitHub secret %s\n' "$GREEN" "$RESET" "$name"
+      return
+    fi
+  fi
+  SKIPPED+=("GitHub secret $name (set it manually: gh secret set $name)")
+  warn "skipped GitHub secret $name: gh not ready; set it later"
+}
+
+# set_var NAME VALUE sets a GitHub Actions repo variable (non-secret).
+set_var() {
+  local name="$1" value="$2"
+  if command -v gh >/dev/null 2>&1 && gh auth status >/dev/null 2>&1; then
+    if gh variable set "$name" --body "$value" >/dev/null 2>&1; then
+      printf '  %s✓ set%s GitHub variable %s\n' "$GREEN" "$RESET" "$name"
+      return
+    fi
+  fi
+  SKIPPED+=("GitHub variable $name")
+  warn "skipped GitHub variable $name, gh not ready; set it later"
+}
+
+# finish clears, then shows a closing summary of everything configured.
+finish() {
+  _clear
+  printf '\n%s%s  ✓ Setup complete%s\n' "$BOLD" "$GREEN" "$RESET"
+  (( ${#WRITTEN_ENV[@]} ))    && note "wrote ${#WRITTEN_ENV[@]} value(s) to $ENV_FILE: ${WRITTEN_ENV[*]}"
+  (( ${#WRITTEN_SECRET[@]} )) && note "set ${#WRITTEN_SECRET[@]} GitHub secret(s): ${WRITTEN_SECRET[*]}"
+  if (( ${#SKIPPED[@]} )); then
+    printf '\n'; warn "still to do by hand:"
+    for s in "${SKIPPED[@]}"; do note "  - $s"; done
+  fi
+  printf '\n'
+}
+
+# ──────────────────────────────────────────────────────────────────────────
+# STAGES: author this section. One stage() per step the human takes.
+# Replace the example below. Set TOTAL_STAGES to match the stages you write.
+# ──────────────────────────────────────────────────────────────────────────
+
+TOTAL_STAGES=1
+
+banner "Stripe setup"
+
+# ── Example stage: replace with your real steps ───────────────────────────
+stage "Stripe: API keys"
+say "We'll grab your Stripe test keys and store them for local dev + CI."
+open_url "https://dashboard.stripe.com/test/apikeys"
+step "On the API keys page, copy the Publishable key (starts pk_test_)."
+ask STRIPE_PUBLISHABLE_KEY "Paste the publishable key:"
+step "Click 'Reveal test key' on the Secret key row, then copy it."
+ask_secret STRIPE_SECRET_KEY "Paste the secret key:"
+write_env STRIPE_PUBLISHABLE_KEY "$STRIPE_PUBLISHABLE_KEY"
+write_env STRIPE_SECRET_KEY "$STRIPE_SECRET_KEY"
+set_secret STRIPE_SECRET_KEY "$STRIPE_SECRET_KEY"   # CI needs this one
+# ──────────────────────────────────────────────────────────────────────────
+
+finish
diff --git a/.agents/skills/writing-beats/SKILL.md b/.agents/skills/writing-beats/SKILL.md
new file mode 100644
index 00000000..3d3b25b6
--- /dev/null
+++ b/.agents/skills/writing-beats/SKILL.md
@@ -0,0 +1,67 @@
+---
+name: writing-beats
+description: Writing, exploit; assemble raw material into a journey of beats, grounding each term before a beat leans on it.
+disable-model-invocation: true
+---
+
+<what-to-do>
+
+The user has passed (or will pass) a markdown file of raw material. This is **exploit**: the exploring is done, the pile is fixed. Commit to a path through it and mine the pile to fill each beat.
+
+If the user did not say where to save the article, ask once and remember the path.
+
+Then run a beat-by-beat journey, choose-your-own-adventure style:
+
+1. **Establish the prerequisites.** Before any beats, settle with the user what the audience already knows walking in: the concepts that are **grounded** from the start. Everything else must be grounded by a beat before a later beat can use it. See [Grounding](#grounding).
+2. Write 2–3 candidate **starting beats**, drawn from the raw material. Each is a different entry point into the article. Each may only lean on grounded concepts; note what new concepts each one grounds. Show the user the beats before writing to the article file. The user picks one. Preview what beats that pick unlocks, as if the user is seeing a little way down the path.
+3. Once the user picks a starting beat, write **only that beat** to the article file. A beat may be one sentence or several paragraphs, whatever that beat naturally is. Stop there.
+4. Re-read the article file from disk. Then offer 2–3 candidate **next beats**: different directions the journey could pivot to from where the article now stands. Each must be reachable from the current grounded set; note what each one grounds.
+5. Loop steps 3–5 until the article reaches a natural end.
+
+</what-to-do>
+
+<supporting-info>
+
+## Grounding
+
+Every **concept** has to be **grounded** before a beat can lean on it: the audience either walked in knowing it or met it in an earlier beat. A beat that reaches for an ungrounded concept loses the reader; that is the one move the journey can't make. The unit is the concept, not the word for it: a beat can lean on an idea the reader lacks even with no jargon in sight. Where a concept has a name (a **term**), grounding it means landing the idea and the term together.
+
+A concept gets grounded one of two ways:
+
+- **Prerequisite**: grounded before the first beat. The audience brings it. Fixed at the start.
+- **Introduced**: a beat establishes it, and from then on it's grounded for every later beat.
+
+So each beat does two jobs: it **requires** concepts that are already grounded, and it **grounds** new ones. Keep a running list of what's grounded so far, and update it each time a beat lands.
+
+This is what shapes the choose-your-own-adventure. A candidate beat is only reachable if everything it requires is already grounded; picking a beat that grounds concept X unlocks every beat that was waiting on X. When you offer next beats, they must all be reachable from the current grounded set, and say what each one grounds, so the user can see which paths it opens.
+
+The big lever is what you make a prerequisite versus what you ground inside the piece. Demand too much up front and you shut out readers who don't have it; ground too much inside and the early beats drown in definitions. Settle this with the user when you establish prerequisites, and revisit it whenever a tempting beat turns out to require a concept nothing has grounded yet: the fix is either a grounding beat before it, or promoting the concept to a prerequisite.
+
+## What is a beat
+
+A beat is one move in the journey. It does one thing: sets a scene, lands a point, asks a question, drops an aside, twists the angle. Then it stops, leaving the reader at a place where the next beat can pivot.
+
+A beat is sized by what it needs:
+
+- A single sentence if that's all the move is ("And then nothing happened for three weeks.").
+- A short paragraph if the move needs setup.
+- Multiple paragraphs if the beat is a self-contained vignette, argument, or example.
+
+If a "beat" needs five paragraphs and three subheadings, it's not a beat; it's two beats glued together. Split it.
+
+## Pulling from the pile
+
+Pull material from the raw pile to populate each beat. You can paraphrase, split, recombine, or quote. The pile is a quarry.
+
+## Ending the journey
+
+The article ends when the journey is complete, not when the pile is empty. Most piles will have leftover fragments that don't make it in. That is fine; that is the point of having more raw material than you need.
+
+## Writing rhythm
+
+- Append one beat at a time. Never write ahead.
+- Re-read the article file from disk before every write. Preserve user edits absolutely.
+- If the user edits a previous beat substantially, let it change what comes next.
+- If the user says "rewrite that beat" or "go back and try a different beat 3", do it: edit in place, leave the rest alone.
+
+</supporting-info>
diff --git a/.agents/skills/writing-beats/agents/openai.yaml b/.agents/skills/writing-beats/agents/openai.yaml
new file mode 100644
index 00000000..e8eaa188
--- /dev/null
+++ b/.agents/skills/writing-beats/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Writing Beats"
+  short_description: "Assemble raw material into beats"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/writing-for-agents/SKILL-MECHANICS.md b/.agents/skills/writing-for-agents/SKILL-MECHANICS.md
new file mode 100644
index 00000000..9cdbdb22
--- /dev/null
+++ b/.agents/skills/writing-for-agents/SKILL-MECHANICS.md
@@ -0,0 +1,22 @@
+# Skill mechanics
+
+The skill-specific branch of [`writing-for-agents`](SKILL.md): what changes when the document is a skill (frontmatter, the invocation choice, and router skills). Everything else about writing it is the universal reference in `SKILL.md`.
+
+## Invocation
+
+Two choices, trading the two loads:
+
+- A **model-invoked** skill keeps a `description`, so the agent can fire it autonomously, and other skills can reach it. You can still type its name: model-invocation always _includes_ user reach; a description only ever adds agent discovery, never removes the human's. The description is the skill's top-level context pointer, forced to stay loaded at all times: permanent context load in exchange for discoverability. A model-invoked skill whose content is all reference is also one home for shared reference: another skill can invoke it, so reference needed by several skills lives in one place. Mechanics: omit `disable-model-invocation`, and write a model-facing description carrying the trigger branches (the pointer-writing rules in `SKILL.md` apply in full).
+- A **user-invoked** skill strips the description from the agent's reach: only the human typing its name can invoke it, and no other skill can. Zero context load, but it spends cognitive load: you are the index that must remember it exists. Mechanics: set `disable-model-invocation: true`; the `description` becomes human-facing: a one-line summary, trigger lists stripped.
+
+Pick model-invocation only when the agent must reach the skill on its own, or another skill must. If it only ever fires by hand, make it user-invoked and pay no context load.
+
+Shared reference that two user-invoked skills both need can live in neither: with no descriptions, neither can fire the other. Push it to a plain file outside the skill system: external reference any skill can point at.
+
+## Splitting by invocation
+
+The invocation cut of splitting (the sequence cut lives in `SKILL.md`): split off a model-invoked skill when you have a distinct leading word that should trigger it on its own (a trigger word you actually use in your prompts), or another skill must reach it. You pay context load for the new always-loaded description, so that independent reach has to be worth it.
+
+## Router skills
+
+When user-invoked skills multiply past what you can remember, that piled-up cognitive load is cured by a **router skill**: one user-invoked skill that names the others and when to reach for each, so the human has one skill to remember instead of many. It can only hint, never fire them: user-invoked skills have no description, so nothing but the human can reach them.
diff --git a/.agents/skills/writing-for-agents/SKILL.md b/.agents/skills/writing-for-agents/SKILL.md
new file mode 100644
index 00000000..a37608da
--- /dev/null
+++ b/.agents/skills/writing-for-agents/SKILL.md
@@ -0,0 +1,81 @@
+---
+name: writing-for-agents
+description: Writing documents for agents. Use when creating or editing skills, or modifying AGENTS.md or CLAUDE.md.
+---
+
+Reference for writing any document an agent consumes: a skill, an `AGENTS.md` / `CLAUDE.md`, a doc reached by a pointer. The packaging differs; the writing does not: the same levers make each one predictable, since the agent takes the same _process_ every run rather than producing the same output.
+
+When the document you're writing is a skill, read [`SKILL-MECHANICS.md`](SKILL-MECHANICS.md) for frontmatter, invocation choice, and router skills.
+
+## Context pointers
+
+A **context pointer** is a reference held in the agent's context that names some out-of-context material and encodes the condition for reaching it. A skill's description is one; a line in `AGENTS.md` naming a doc is the same object. The pointer's _wording_, not its target, decides when the agent reaches the material, and how reliably. A must-have target behind a weakly worded pointer is a variance bug: sharpen the wording first, and inline the material only if sharpening fails.
+
+A pointer does two jobs: state what the material is, and list the **branches** that should trigger reaching it (a branch is a distinct case the document handles, so different runs take different paths through it). Every word of an always-loaded pointer costs on every turn, so it earns even harder pruning than the body:
+
+- **Front-load the leading word**: the pointer is where it does its triggering work.
+- **One trigger per branch.** Synonyms that rename a single branch are one branch written twice; collapse them and keep only genuinely distinct branches.
+- **Cut identity the body already carries.**
+
+## The two loads
+
+Every document and pointer you add spends one of two budgets:
+
+- **Context load** is the cost of always-loaded material on the agent's window: an `AGENTS.md` line, a skill description, anything sitting in context every turn, spending tokens and attention whether or not it fires.
+- **Cognitive load** is the cost on the human: which documents exist and when to reach for each. The human is the index. Not a cost to minimise: it is the price of human agency; spend it where human judgement matters, remove it where it does not.
+
+Material reached only through a pointer escapes context load at the price of the pointer's own line; material with no pointer at all rides entirely on cognitive load.
+
+## Information hierarchy
+
+A document is built from two content types: **steps** (the ordered actions the agent performs) and **reference** (definitions, rules, facts consulted on demand). The two mix freely: all steps (a recipe), all reference (a review's rules, this skill), or both. The core decision is where each piece sits on the **information hierarchy**, a ladder ranked by how immediately the agent needs the material:
+
+1. **In-file step** is the primary tier: what the agent does, in order.
+2. **In-file reference** is consulted on demand. Often a legitimately flat peer-set (every rule of a review on one rung), which is a fine arrangement, not a smell.
+3. **Disclosed reference** is pushed out into a separate file, reached by a context pointer, loaded only when the pointer fires. Spans a sibling file in the same folder through fully external reference that lives anywhere and any document can point at.
+
+Push too little down and the top bloats; push too much and you hide material the agent actually needs. That tension is the whole decision.
+
+**Progressive disclosure** is the move down the ladder (out of the main file and behind a pointer) so the top stays legible. Not primarily a token optimisation: it is how the hierarchy is protected. Branching is the cleanest disclosure test: inline what every branch needs, and push behind a pointer what only some branches reach. When a document has steps, in-file reference that should be disclosed buries them and turns attending to them into a coin-flip: a variance lever, not just a legibility one.
+
+**Co-location** is the within-file companion: where the ladder decides _how far down_ a piece sits, co-location decides _what sits beside it_ once there. Keep a concept's definition, rules, and caveats under one heading rather than scattered, so reading one part brings its neighbours with it. The test: the document should read like documentation written for the agent. Grouped material reads that way; scattered material does not. (Distinct from duplication: that repeats one meaning in two places; scattering fragments one meaning across many.)
+
+**Sprawl** is the failure mode here: a document simply too long, even when every line is live and unique. Attention thins across the excess, and every extra line is one more to keep relevant. The cure is the ladder: disclose reference behind pointers, and split by branch or sequence so each path carries only what it needs.
+
+## Steps and completion criteria
+
+Every step ends on a **completion criterion**, the condition that tells the agent the work is done. Two properties make it a lever:
+
+- **Clarity**: can the agent tell done from not-done? A vague bound ("understanding reached") invites **premature completion**: ending the step before it is genuinely done, attention slipping to _being done_. The visible steps still ahead (the **post-completion steps**) supply the pull; the criterion's clarity is the resistance. Defend in order: **sharpen the bound first** (local and cheap); only if it is irreducibly fuzzy _and_ you observe the rush, hide the later steps by splitting the sequence. Hiding only works across a real context boundary (a hand-off or a subagent dispatch; an inline call leaves the later steps in context and clears nothing).
+- **Demand**: how much it requires. "Every modified model accounted for" forces thorough work where "produce a change list" does not. Demand drives **legwork** (the digging the agent does within the work, latent in the wording rather than written as its own step), and it is not step-bound: "every rule applied" binds a body of flat reference just as "every step done" binds a sequence, which is how an all-reference document still carries an exhaustiveness bar.
+
+The strongest criteria are both checkable and exhaustive.
+
+## When to split
+
+Splitting one document into two spends one of the two loads, so split only when the cut earns it:
+
+- **By sequence**: split a run of steps where the post-completion steps tempt the agent to rush the one in front of it. Keeping them out of view drives more legwork on the current task. Beware the reverse: merging sequences exposes each step's later steps to what follows, inviting premature completion.
+- **By invocation**, skill-specific: see [`SKILL-MECHANICS.md`](SKILL-MECHANICS.md).
+
+## Leading words
+
+A **leading word** is a compact concept already living in the model's pretraining that the agent thinks with while running the document (_lesson_, _fog of war_, _tracer bullets_). Repeated as a token, never as a sentence, it accumulates a distributed definition and anchors a whole region of behaviour in the fewest tokens, by recruiting priors the model already holds. Coining your own works if you define it clearly, but a made-up word recruits no priors: you pay in definition tokens what a pretrained word gives free; reach for an existing word first.
+
+It anchors twice. In the body, _execution_: the agent reaches for the same behaviour every time the word appears, and inside flat reference it focuses attention on a class of thing to look for. In a pointer, _invocation_: when the same word lives in your prompts, your docs, and your codebase, the agent links that shared language to the material and reaches it more reliably.
+
+Hunt for opportunities to refactor with leading words. A triad spelled out at three sites, a pointer spending a sentence to gesture at one idea. Each is a passage begging to collapse into a single token:
+
+- "fast, deterministic, low-overhead" → _tight_ (a _tight_ loop).
+- "a loop you believe in" → _red_, turning a fuzzy gate into a binary observable state (the loop goes _red_ on the bug, or it doesn't).
+
+You win twice: fewer tokens, and a sharper hook for the agent to hang its thinking on. Assume every document is carrying restatements that leading words retire. Go find them.
+
+**Negation** is the failure mode beside this lever: steering by prohibition drags the forbidden behaviour into context and makes it _more_ available, not less. _Don't think of an elephant_, and the elephant is all there is; the negation is a weak modifier the strongly-activated concept overruns, so the ban half-reads as an instruction to do the thing. Prompt the **positive**: state the target behaviour ("write one-line comments") so the banned one is never spoken. A prohibition earns its place only as a hard guardrail you cannot phrase positively; even then, pair it with the positive target so attention lands on what to do.
+
+## Pruning
+
+- Keep each meaning in a **single source of truth**: one authoritative place, so changing the behaviour is a one-place edit. **Duplication** (the same meaning in more than one place) costs maintenance and tokens, and inflates a meaning's prominence on the ladder past its real rank. (The accidental inverse of a leading word, which repeats a token on purpose, never the meaning.)
+- The **environment** is a source of truth too (`package.json` scripts, config files, the directory layout, `--help` output), and a document that restates it is a **cache**: a copy of a lookup, earning its load only when the lookup is expensive. Cache what the agent cannot find by looking: the unwritten convention, the reason behind a choice, the gotcha no config confesses. Leave the one-file, one-command lookups to the environment, where they cannot go stale.
+- Check every line for **relevance**: does it still bear on what the document does? A line loses relevance by never bearing on the task (mere exposition, or a branch that should be disclosed) or by going stale as the behaviour or world it describes changes. Shorter documents are easier to keep relevant. Without a pruning discipline the default fate is **sediment**: stale layers that settle because adding feels safe and removing feels risky, until you must core down through them to find what is still live.
+- Hunt **no-ops** sentence by sentence: an instruction the model already obeys by default pays load to say nothing. The test (does it change behaviour versus the default?) is model-relative, not reader-relative: two people disagreeing about a no-op disagree about the default, and settle it by running the document, not by debate. When a sentence fails, delete the whole sentence rather than trim words from it. The test also grades leading words: a word too weak to beat the default (_be thorough_ when the agent is already thorough-ish) is a no-op, and the fix is a stronger word (_relentless_), not a different technique.
diff --git a/.agents/skills/writing-for-agents/agents/openai.yaml b/.agents/skills/writing-for-agents/agents/openai.yaml
new file mode 100644
index 00000000..079c933b
--- /dev/null
+++ b/.agents/skills/writing-for-agents/agents/openai.yaml
@@ -0,0 +1,3 @@
+interface:
+  display_name: "Writing for Agents"
+  short_description: "Write documents agents consume"
diff --git a/.agents/skills/writing-fragments/SKILL.md b/.agents/skills/writing-fragments/SKILL.md
new file mode 100644
index 00000000..c7c889b8
--- /dev/null
+++ b/.agents/skills/writing-fragments/SKILL.md
@@ -0,0 +1,79 @@
+---
+name: writing-fragments
+description: "Writing, explore: mine raw fragments, no structure yet."
+disable-model-invocation: true
+---
+
+<what-to-do>
+
+This is pure **explore**: widen the space of what could be written without committing to structure. Committing is _exploit_, a separate skill's job. Run a grilling session that produces fragments, interviewing the user relentlessly about whatever they want to write about. Imposing phases, outlines, or article structure is out of scope here.
+
+As fragments emerge from either side of the conversation, append them to a single markdown file.
+
+If the user did not pass a path, ask once where to save the document, then remember it for the rest of the session.
+
+Capture fragments from the very first thing the user says, including the initial prompt.
+
+On first write, put a single H1 at the top with a working title (it can change later) and nothing else: no metadata, no TOC, no date.
+
+</what-to-do>
+
+<supporting-info>
+
+## What is a fragment
+
+A fragment is any piece of text that might survive into the final article. It must be _readable by the author_ (the author can tell what it means), but it does not need to define its terms or be comprehensible to a cold reader. The bar is "is this a piece of good writing?", not "is this a self-contained argument?"
+
+Fragments are deliberately heterogeneous. Examples of what could be a fragment:
+
+- A sharp sentence you'd want to deploy somewhere but don't yet know where.
+- A claim with a one-line justification.
+- A vignette: a thing that happened, a code snippet, a scenario, an analogy.
+- A half-thought: "something about how X feels like Y, work this out later."
+- A quote, a piece of dialogue, an overheard line.
+- A list of related observations that hang together by feel.
+- A complaint, a confession, a punchline.
+- A **leading word**: a compact metaphor or coinage the whole piece can hang on (one term that names the idea, the way _tracer bullets_ or _fog of war_ names a whole pattern).
+
+Of these, the leading word is the most valuable fragment to land. It is load-bearing: name the right one in explore and it shapes the structure, the transitions, and the title later, paying dividends through the entire exploit phase. When the conversation circles a recurring idea, push to coin a word for it.
+
+The novelist's diary is the model: years of unstructured noticings that later get mined for raw material. Fragments are noticings.
+
+## File format
+
+```markdown
+# Working title
+
+A first fragment lives here.
+
+It can be multiple paragraphs. It can include lists, code, quotes: whatever
+shape the fragment naturally takes.
+
+---
+
+A second fragment.
+
+---
+
+> A quoted line that the user wants to keep around.
+
+A reaction to it.
+
+---
+
+- A cluster of related observations
+- That hang together by feel
+- And want to be near each other
+```
+
+Fragments are separated by a horizontal rule (`\n---\n`). No headings inside the body. No tags. No order beyond the order they were added.
+
+## Writing rhythm
+
+Append silently. Don't ask permission for each fragment. Mention what you added in passing ("adding that"), but don't interrupt the conversation with save dialogs.
+
+Before every write: re-read the file from disk. The user may have edited, reordered, or deleted fragments between turns, so preserve their changes. Never overwrite the file; only append (or, if the user asks, edit a specific fragment in place).
+
+The user can say "cut the last one", "rewrite that one sharper", "merge those two" at any time. Treat those as first-class instructions.
+
+</supporting-info>
diff --git a/.agents/skills/writing-fragments/agents/openai.yaml b/.agents/skills/writing-fragments/agents/openai.yaml
new file mode 100644
index 00000000..be3713e9
--- /dev/null
+++ b/.agents/skills/writing-fragments/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Writing Fragments"
+  short_description: "Mine raw writing fragments"
+policy:
+  allow_implicit_invocation: false
diff --git a/.agents/skills/writing-shape/SKILL.md b/.agents/skills/writing-shape/SKILL.md
new file mode 100644
index 00000000..02f2866d
--- /dev/null
+++ b/.agents/skills/writing-shape/SKILL.md
@@ -0,0 +1,79 @@
+---
+name: writing-shape
+description: "Writing, exploit: shape raw material into an article, paragraph by paragraph."
+disable-model-invocation: true
+---
+
+<what-to-do>
+
+The user has passed (or will pass) a markdown file of raw material. Treat it as the input pile: anything from a tidy list of fragments to a wall of unstructured prose to a transcript. The format does not matter. Read it end-to-end before doing anything else.
+
+Then run a shaping session that produces a separate article document. This is **exploit**: the exploring is done, the pile is fixed: commit to a structure and mine the pile to fill it. Do not edit the raw material file: it is read-only to this skill.
+
+If the user did not say where to save the article, ask once and remember the path.
+
+</what-to-do>
+
+<supporting-info>
+
+## The loop
+
+1. **Read the pile.** Read the input file in full. Form a sense of what's in it.
+2. **Establish the prerequisites.** Settle with the user what the reader knows walking in: the concepts that are **grounded** from the start. Everything else must be grounded by a block before a later block can lean on it. See [Grounding](#grounding).
+3. **Draft 2–3 candidate openings.** Each opening should imply a different thesis or angle for the article. Show all of them. Force the user to pick or compose a hybrid. The chosen opening defines what the rest of the article must do.
+4. **Grow paragraph by paragraph.** After the opening lands, ask "given this opening, what does the reader need to hear next?" Pull material from the pile to answer. The next block may only lean on grounded concepts, and grounds new ones as it lands. Argue about the form the next block takes: a paragraph, a list, a table, a callout, a quote, a code block. Each format choice should be deliberate and defensible.
+5. **Append to the article file as you go.** Don't batch. Write each agreed paragraph or block immediately so the user can see the article taking shape.
+6. **Loop step 4 until the article is done.** The user decides when it's done.
+
+## Grounding
+
+Every **concept** has to be **grounded** before a block can lean on it: the reader either walked in knowing it or met it in an earlier block. A block that reaches for an ungrounded concept loses the reader. The unit is the concept, not the word for it: a block can lean on an idea the reader lacks even with no jargon in sight. Where a concept has a name (a **term**), grounding it means landing the idea and the term together.
+
+A concept gets grounded one of two ways:
+
+- **Prerequisite**: grounded before the opening. The reader brings it. Fixed at the start.
+- **Introduced**: a block establishes it, and from then on it's grounded for the rest of the article.
+
+Keep a running list of what's grounded. When you ask "what does the reader need to hear next?", an ungrounded concept the next move needs is itself the answer: ground it first (here or in an earlier block) or you can't make the move. This is the gap-naming of [Pulling from the pile](#pulling-from-the-pile) one level up: there the pile is missing material; here the article is missing a foundation.
+
+The lever is what you make a prerequisite versus what you ground inside the article. Demand too much up front and you shut readers out; ground too much inside and the opening drowns in definitions. Settle it with the user when you establish prerequisites.
+
+## Conversational feel
+
+This is a grilling session inverted. In ideation, the question was "what are you actually noticing?" Here it's "what is this article actually arguing, and in what order does the reader need to hear it?" Push back. Refuse to let weak transitions slide. If a paragraph doesn't earn its place, cut it.
+
+Specific moves to keep using:
+
+- "What does this paragraph do for the reader that the previous one didn't?"
+- "If I cut this, what breaks?"
+- "Is this prose, or should it be a list? Why prose?"
+- "This sentence is doing two jobs: split it or pick one."
+- "The opening promised X. We've drifted to Y. Either re-thread it or change the opening."
+
+## Pulling from the pile
+
+Treat the raw material as a quarry, not a script. Pull a fragment, rework it to fit the surrounding paragraph, and place it. A fragment may be split across multiple paragraphs, merged with another, or paraphrased. The pile's job is to be mined; the article's job is to read as one voice.
+
+If the pile lacks something the article needs, name the gap explicitly: "We need an example here and the pile doesn't have one. Give me one now or we cut this section."
+
+## Format arguments to actually have
+
+When choosing how to render a block, weigh these tradeoffs out loud with the user, not silently:
+
+- **Prose vs. list.** Prose carries argument; lists carry parallel items. If items aren't truly parallel, prose is better. If they are, a list is faster to scan.
+- **Inline vs. callout.** Tips, warnings, and asides go in callouts (`> [!TIP]`, `> [!NOTE]`), but only if they'd genuinely derail the main argument inline. Otherwise leave them inline.
+- **Table vs. repeated structure.** If the same shape repeats 3+ times with the same fields, a table. Otherwise prose with bold leads.
+- **Quote vs. paraphrase.** Quote when the original wording is the point. Paraphrase when only the idea matters.
+- **Code block vs. inline code.** Multi-line, runnable, or illustrative → block. Single token or identifier → inline.
+
+## Writing rhythm
+
+Append to the article file as each block is agreed. Re-read the file from disk before every write: the user may have edited between turns. Never overwrite blindly. If the user wants a paragraph rewritten, edit that specific paragraph in place; leave the rest alone.
+
+## Out of scope
+
+- Mining for new fragments that aren't in the pile (handle gaps as in "Pulling from the pile").
+- Editing the raw material file.
+- Publishing, formatting for a specific platform, or adding frontmatter the user didn't ask for.
+
+</supporting-info>
diff --git a/.agents/skills/writing-shape/agents/openai.yaml b/.agents/skills/writing-shape/agents/openai.yaml
new file mode 100644
index 00000000..87e0c736
--- /dev/null
+++ b/.agents/skills/writing-shape/agents/openai.yaml
@@ -0,0 +1,5 @@
+interface:
+  display_name: "Writing Shape"
+  short_description: "Shape raw material into an article"
+policy:
+  allow_implicit_invocation: false
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 5a35aea4..f6a6524e 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -7,16 +7,29 @@ on:
 
 jobs:
   Release:
-    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Install Node.js
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v4
         with:
-          node-version: 14.x
-      - run: npm install
+          node-version-file: .nvmrc
+      - name: Install pinned npm
+        run: npm install --global npm@12.0.1
+        working-directory: ${{ runner.temp }}
+      - name: Verify toolchain
+        run: node --version && npm --version
+      - run: npm ci
+      - run: npm ci --prefix packages/description-renderer
+      - run: npm ci --prefix packages/mcp-server
+      - name: Package platform VSIX
+        run: npm run package
       - name: Publish to VS Marketplace
-        run: npx vsce publish
+        run: npm run publish:vsix
         env:
           VSCE_PAT: ${{ secrets.VSCE_PAT }}
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 00000000..85954aaf
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,39 @@
+name: Test
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: .nvmrc
+          cache: npm
+          cache-dependency-path: |
+            package-lock.json
+            packages/mcp-server/package-lock.json
+            packages/description-renderer/package-lock.json
+      - name: Install pinned npm
+        run: npm install --global npm@12.0.1
+        working-directory: ${{ runner.temp }}
+      - name: Verify toolchain
+        run: node --version && npm --version
+      - run: npm ci
+      - run: npm ci --prefix packages/description-renderer
+      - run: npm ci --prefix packages/mcp-server
+      - run: npm test
+      - run: npm run package
+      - name: Upload platform VSIX
+        uses: actions/upload-artifact@v4
+        with:
+          name: codetour-${{ matrix.os }}-${{ runner.arch }}
+          path: codetour-*.vsix
+          if-no-files-found: error
diff --git a/.node-version b/.node-version
new file mode 100644
index 00000000..ca5c3500
--- /dev/null
+++ b/.node-version
@@ -0,0 +1 @@
+24.18.0
diff --git a/.nvmrc b/.nvmrc
new file mode 100644
index 00000000..ca5c3500
--- /dev/null
+++ b/.nvmrc
@@ -0,0 +1 @@
+24.18.0
diff --git a/.tours/changes.tour b/.tours/changes.tour
new file mode 100644
index 00000000..d027dc4a
--- /dev/null
+++ b/.tours/changes.tour
@@ -0,0 +1,60 @@
+{
+  "$schema": "https://aka.ms/codetour-schema",
+  "title": "Clarification des commentaires de la branche feature/commentaire",
+  "description": "Ce Changes Tour présente le commit qui réécrit des commentaires dans sept fichiers sans modifier le comportement exécutable. Il montre l'intention de rendre les explications plus accessibles, les principaux parcours concernés, ainsi que le point de vigilance sur le vocabulaire canonique défini par le domaine.\n\nGenerated from the merge-base of `main` (`dbf557cb15a2d894e3e0bd65497c9e576417dcb3`) to `42c719c7cb4913b099a096b6e23bda29d3b47b5d`.",
+  "ref": "42c719c7cb4913b099a096b6e23bda29d3b47b5d",
+  "steps": [
+    {
+      "title": "Intention générale : expliquer le rôle du serveur MCP",
+      "description": "Le commentaire d'ouverture ne décrit plus seulement l'inventaire technique des deux outils. Il présente le serveur comme la frontière entre l'agent, qui rédige le contenu, et le serveur, qui garantit qu'un Tour peut être ouvert en sécurité. Le code, les schémas et les handlers restent inchangés : cette branche modifie uniquement la manière de raconter leur responsabilité.",
+      "file": "packages/mcp-server/src/server.ts",
+      "pattern": "Point de passage entre l'agent IA et CodeTour"
+    },
+    {
+      "title": "Deux destinations stables et deux usages",
+      "description": "Les commentaires mettent désormais l'accent sur l'expérience : retrouver toujours la dernière génération au même emplacement et distinguer la découverte globale du projet de l'explication des changements. Les constantes `.tours/project.tour` et `.tours/changes.tour` ne changent pas, pas plus que la persistance atomique.",
+      "file": "packages/mcp-server/src/server.ts",
+      "pattern": "Chaque type de visite possède une destination stable"
+    },
+    {
+      "title": "Activation et ouverture par lien",
+      "description": "La mise en cache de `discoverTours()` est maintenant expliquée par son résultat visible : l'activation normale et l'ouverture par URI partagent la même découverte, ce qui évite une seconde lecture avant d'afficher le Tour demandé. La conversion d'une étape publique numérotée à partir de 1 vers l'index interne à partir de 0 est également explicitée.",
+      "file": "src/extension.ts",
+      "pattern": "Partage la découverte des visites"
+    },
+    {
+      "title": "Commandes du lecteur décrites par leur effet",
+      "description": "Les anciens libellés génériques comme `Purpose: Command link` sont remplacés par l'effet de chaque commande : ouvrir un Tour depuis un marqueur, suivre un lien Markdown, naviguer vers une étape ou envoyer le texte d'une étape au terminal. Les enregistrements de commandes et leurs callbacks ne sont pas modifiés.",
+      "file": "src/player/commands.ts",
+      "pattern": "Permet à l'aperçu d'un marqueur"
+    },
+    {
+      "title": "Rendu des étapes dans l'éditeur",
+      "description": "Trois détails du lecteur sont reformulés : le placement d'une étape sans ligne identifiable, la conversion des coordonnées 1-based en coordonnées VS Code 0-based et le rafraîchissement réactif du commentaire affiché. Attention : la nouvelle formulation masque le caractère approximatif de `line = 2000`, que l'ancien commentaire qualifiait explicitement de solution temporaire.",
+      "file": "src/player/index.ts",
+      "pattern": "Sans ligne ni motif retrouvable"
+    },
+    {
+      "title": "Modèle d'une étape et état actif",
+      "description": "Les commentaires des types décrivent maintenant les invariants du modèle : une seule destination par étape, une position réservée aux étapes fichier, un Tour actif éventuellement sans commentaire pendant l'enregistrement, et le rôle de la racine et des Tours associés. Aucun type TypeScript n'a changé.",
+      "file": "src/store/index.ts",
+      "pattern": "Une étape guide le lecteur vers un seul type de destination"
+    },
+    {
+      "title": "Rechargement d'un Tour actif",
+      "description": "La mise à jour en place d'un Tour observé et la fermeture d'un Tour supprimé sont expliquées du point de vue de la continuité de lecture. Les appels `set(...)` et `endCurrentCodeTour()` sont inchangés.",
+      "file": "src/store/provider.ts",
+      "pattern": "Recharge la visite sans interrompre la lecture"
+    },
+    {
+      "title": "Point de vigilance : vocabulaire du domaine",
+      "description": "Le glossaire exige les termes canoniques **Project Tour**, **Changes Tour**, **Tour** et **Tour Anchor**. Plusieurs nouveaux commentaires utilisent plutôt « visite d'accueil du projet » ou « visite de revue de branche ». Cette dernière formulation se rapproche même du terme déconseillé « branch tour ». La clarification est donc cohérente dans son intention, mais devrait conserver les noms du domaine dans les phrases françaises.",
+      "file": "CONTEXT.md",
+      "pattern": "\\*\\*Project Tour\\*\\*"
+    },
+    {
+      "title": "Validation",
+      "description": "La branche contient un seul commit (`42c719c`) et touche uniquement des commentaires : 45 insertions et 57 suppressions dans sept fichiers. `npm run build` compile les bundles Node et Web avec succès. `npm --prefix packages/mcp-server test` exécute 69 tests, tous réussis. Aucun ticket ou document de spécification d'origine n'est référencé par le commit ; la conformité fonctionnelle ne peut donc être comparée qu'à son intention déclarée de clarifier et harmoniser les commentaires."
+    }
+  ]
+}
diff --git a/.tours/mcp-server.tour b/.tours/mcp-server.tour
new file mode 100644
index 00000000..964a5d6a
--- /dev/null
+++ b/.tours/mcp-server.tour
@@ -0,0 +1,90 @@
+{
+  "$schema": "https://aka.ms/codetour-schema",
+  "title": "Comprendre le serveur MCP de CodeTour",
+  "description": "Un parcours ciblé qui suit une requête depuis la découverte du serveur par Visual Studio Code jusqu’à la validation et à l’écriture atomique d’un fichier `.tour`. Il présente aussi le traitement spécifique des Changes Tours et les principales frontières de sécurité.",
+  "steps": [
+    {
+      "title": "Vue d’ensemble du package MCP",
+      "description": "Le serveur est isolé dans `packages/mcp-server`. Son point d’entrée lance le transport MCP, `server.ts` expose les outils, `validation.ts` contrôle les propositions, `git.ts` reconstruit le contexte d’une branche et `persistence.ts` publie le résultat. Les tests d’intégration démarrent un vrai client MCP contre ce package pour vérifier le trajet complet.",
+      "directory": "packages/mcp-server"
+    },
+    {
+      "title": "Le rôle du serveur MCP",
+      "description": "Le serveur MCP est le pont entre un agent IA et CodeTour. L’agent analyse le dépôt et rédige entièrement les explications ; le serveur, lui, ne génère pas de prose. Il fournit deux opérations déterministes, vérifie chaque proposition contre le workspace réel, puis la persiste sous `.tours`. Cette séparation garde la créativité côté agent et la sûreté côté serveur.",
+      "file": "packages/mcp-server/package.json",
+      "pattern": "\"description\": \"Local MCP server"
+    },
+    {
+      "title": "L’extension publie une instance par workspace",
+      "description": "Sur VS Code Desktop, l’extension déclare le binaire MCP embarqué auprès de l’éditeur. Elle construit une définition `stdio` par dossier ouvert et fixe son répertoire de travail avec `definition.cwd`. Chaque processus reçoit donc implicitement son unique racine de workspace, sans argument propriétaire ajouté au protocole MCP.",
+      "file": "src/mcp.ts",
+      "pattern": "export function registerMcpProvider\\(context: vscode\\.ExtensionContext\\)"
+    },
+    {
+      "title": "Le processus démarre sur stdio",
+      "description": "Le binaire prend `process.cwd()` comme racine, vérifie immédiatement qu’elle est accessible, crée le serveur puis le connecte à `StdioServerTransport`. Les messages MCP transitent par l’entrée et la sortie standard : il n’y a ni port HTTP ni accès réseau à configurer. Les options de ligne de commande sont volontairement limitées à l’aide et à la version.",
+      "file": "packages/mcp-server/src/cli.ts",
+      "pattern": "async function main\\(\\): Promise<void>"
+    },
+    {
+      "title": "Une frontière fondée sur les chemins réels",
+      "description": "Le contexte mémorise à la fois la racine résolue syntaxiquement et sa forme réelle obtenue avec `realpathSync`. Les validations ultérieures comparent les chemins réels à `realRoot`, ce qui empêche un lien symbolique placé dans le projet de donner accès à un fichier situé à l’extérieur.",
+      "file": "packages/mcp-server/src/context.ts",
+      "pattern": "export function createContext\\(workspaceRoot: string\\)"
+    },
+    {
+      "title": "Deux outils, deux intentions",
+      "description": "`createServer` construit un serveur nommé `codetour-mcp` et enregistre deux outils. `create_project_tour` explique durablement l’architecture globale du dépôt. `create_changes_tour` raconte les changements d’une branche depuis une référence Git. Leurs contrats peuvent évoluer séparément, tout en réutilisant le même moteur de validation et de persistance.",
+      "file": "packages/mcp-server/src/server.ts",
+      "pattern": "export function createServer\\(workspaceRoot: string\\): McpServer"
+    },
+    {
+      "title": "Pourquoi les schémas MCP restent permissifs",
+      "description": "Les entrées exposées au SDK utilisent `z.unknown()` et `.passthrough()`. Ce choix est intentionnel : si le SDK rejetait la requête au premier champ incorrect, l’agent devrait corriger les erreurs une par une. Le serveur laisse donc passer la forme brute jusqu’à sa validation métier, qui peut retourner en une seule réponse la liste complète des problèmes.",
+      "file": "packages/mcp-server/src/server.ts",
+      "pattern": "const projectToolInputSchema = z"
+    },
+    {
+      "title": "Le flux simple d’un Project Tour",
+      "description": "Le handler exige au moins une étape, valide les paramètres et toutes les ancres, puis construit le JSON CodeTour. Le titre possède une valeur par défaut et un avertissement est ajouté au-delà de quinze étapes. Enfin, `persistTour` valide le document complet et l’écrit à l’emplacement stable `.tours/project.tour`, en remplaçant seulement le précédent tour du même type.",
+      "file": "packages/mcp-server/src/server.ts",
+      "pattern": "async function handleCreateProjectTour\\("
+    },
+    {
+      "title": "La validation accumule tous les problèmes",
+      "description": "`validateSteps` parcourt la proposition entière et concatène les erreurs de chaque étape. Une étape doit contenir une description et ne peut utiliser que les champs V1 autorisés. Les localisateurs sont cohérents : fichier et répertoire s’excluent, ligne et motif nécessitent un fichier, et ligne et motif ne peuvent pas être employés ensemble.",
+      "file": "packages/mcp-server/src/validation.ts",
+      "pattern": "export function validateSteps\\("
+    },
+    {
+      "title": "Les ancres sont vérifiées contre le disque",
+      "description": "Le contrôle ne se limite pas à la forme JSON. Pour une ancre de fichier ou de répertoire, le serveur refuse les chemins absolus et les sorties de workspace, résout les liens symboliques, vérifie le type de cible, les bornes de lignes et de sélections, puis exige qu’un motif soit une expression régulière valide correspondant exactement une fois. Le tour ne peut donc pas pointer silencieusement vers un emplacement ambigu ou inexistant.",
+      "file": "packages/mcp-server/src/validation.ts",
+      "pattern": "function checkAnchor\\("
+    },
+    {
+      "title": "Le Changes Tour fige son contexte Git",
+      "description": "Le second handler demande une base Git et le SHA complet analysé. Il confirme que ce SHA est encore le `HEAD` courant, calcule le merge-base et refuse un diff vide. Les changements locaux sont exclus par défaut avec un avertissement, ou inclus explicitement en signalant que le résultat n’est plus reproductible. Une ultime lecture de `HEAD` juste avant l’écriture évite de publier une analyse devenue obsolète pendant le traitement.",
+      "file": "packages/mcp-server/src/server.ts",
+      "pattern": "async function handleCreateChangesTour\\("
+    },
+    {
+      "title": "La dernière barrière est le schéma CodeTour",
+      "description": "Même après les contrôles métier, `persistTour` valide l’objet final contre le schéma CodeTour général. Il convertit ensuite les erreurs attendues en réponses MCP structurées : succès avec chemin, nombre d’étapes et avertissements, ou échec avec code, message et liste d’issues. L’agent peut ainsi comprendre précisément ce qu’il doit corriger.",
+      "file": "packages/mcp-server/src/server.ts",
+      "pattern": "async function persistTour\\("
+    },
+    {
+      "title": "L’écriture est atomique",
+      "description": "Le contenu validé est écrit dans un fichier temporaire situé dans le même répertoire que la destination, synchronisé sur disque, fermé, puis renommé. Le répertoire réel est de nouveau contrôlé avant l’écriture. Si le renommage échoue, le temporaire est nettoyé ; l’ancien tour reste donc intact et aucun fichier partiel n’est présenté à l’utilisateur.",
+      "file": "packages/mcp-server/src/persistence.ts",
+      "pattern": "export async function writeTourAtomic\\("
+    },
+    {
+      "title": "Le trajet complet d’une requête",
+      "description": "En résumé : l’éditeur ou Codex lance le processus dans le workspace ; le client découvre les deux outils via MCP ; l’agent envoie un tour déjà rédigé ; le handler valide paramètres, ancres et contexte Git ; le schéma CodeTour vérifie le document final ; enfin l’écriture atomique publie `.tours/project.tour` ou `.tours/changes.tour`. Cette architecture fait du serveur une petite frontière de confiance locale, prévisible et testable.",
+      "file": "packages/mcp-server/test/helpers/test-utils.ts",
+      "pattern": "export async function withServer<T>\\("
+    }
+  ]
+}
diff --git a/.tours/project.tour b/.tours/project.tour
new file mode 100644
index 00000000..43735c54
--- /dev/null
+++ b/.tours/project.tour
@@ -0,0 +1,66 @@
+{
+  "$schema": "https://aka.ms/codetour-schema",
+  "title": "Comprendre CodeTour et la génération Mermaid",
+  "description": "Tour guidé du dépôt CodeTour, centré sur le parcours complet d'une visite et sur la manière dont un agent génère des diagrammes Mermaid, dont le serveur MCP les valide, puis dont l'extension les rend pendant la lecture.",
+  "steps": [
+    {
+      "title": "Le dépôt en un coup d'oeil",
+      "description": "CodeTour associe des explications Markdown à des emplacements du code dans un fichier `.tour`. Le dépôt contient deux produits : l'extension VS Code, qui découvre et lit les visites, et `codetour-mcp`, qui permet à un agent de générer des Project Tours ou des Changes Tours. Le renderer Mermaid est un package partagé entre validation et lecture.",
+      "directory": "packages"
+    },
+    {
+      "title": "L'extension compose l'expérience",
+      "description": "`activate` est le point d'entrée appelé par VS Code. Il enregistre le player, le recorder, Live Share et le provider de notebooks, puis découvre les Tours du workspace avant d'initialiser l'intégration Git. La génération MCP est séparée de cette activation : elle écrit un fichier que cette extension saura ensuite découvrir.",
+      "file": "src/extension.ts",
+      "pattern": "export async function activate\\(context: vscode\\.ExtensionContext\\)"
+    },
+    {
+      "title": "Le lecteur navigue vers une étape",
+      "description": "Quand une visite démarre, le player résout le fichier et l'ancre de l'étape courante. Une ligne ou une sélection peut être explicite ; sinon un `pattern` retrouve le texte dans le document. Le Markdown de la description passe ensuite par les transformations de preview avant d'être affiché dans le commentaire VS Code.",
+      "file": "src/player/index.ts",
+      "pattern": "async function renderCurrentStep\\(\\)"
+    },
+    {
+      "title": "Deux portes d'entrée pour générer",
+      "description": "Le serveur MCP local expose deux outils spécialisés : `create_project_tour` explique le codebase dans son état courant, tandis que `create_changes_tour` explique les changements depuis une référence Git. L'agent rédige les titres, descriptions, ancres et éventuels blocs Mermaid ; le serveur ne complète pas le contenu, il le contrôle et le persiste.",
+      "file": "packages/mcp-server/src/server.ts",
+      "pattern": "export function createServer\\(workspaceRoot: string\\)"
+    },
+    {
+      "title": "La génération Mermaid est proposée par l'agent",
+      "description": "Un diagramme Mermaid n'est pas une image envoyée par l'agent : sa source est incluse dans la description Markdown d'une étape. Le bloc doit être précédé par une ligne non vide servant de légende et de texte alternatif, par exemple `**Diagram — Flux de génération et de lecture**`. Les cinq familles acceptées sont `flowchart`, `sequenceDiagram`, `stateDiagram-v2`, `classDiagram` et `erDiagram`.",
+      "file": "packages/mcp-server/src/mermaid-validation.ts",
+      "pattern": "const MERMAID_TOOL_GUIDANCE ="
+    },
+    {
+      "title": "Le serveur valide avant d'écrire",
+      "description": "Avant de remplacer `.tours/project.tour` ou `.tours/changes.tour`, le serveur inspecte chaque description et chaque étape. Il vérifie la légende, le type Mermaid, la taille maximale de 20 KB, la limite de trois diagrammes par description, puis parse la source avec le même moteur verrouillé que celui utilisé pendant la lecture. Toutes les erreurs sont agrégées et l'ancien fichier est conservé si la proposition est invalide.\n\n**Diagram — Contrat de génération Mermaid**\n\n```mermaid\nflowchart LR\n    Agent[Agent IA] -->|Markdown + source Mermaid| Tool[Outil MCP]\n    Tool --> Rules[Règles Mermaid]\n    Rules --> Engine[Parser Mermaid verrouillé]\n    Engine -->|valide| Persist[Écriture du Tour]\n    Engine -->|invalide| Errors[Erreurs agrégées]\n    Errors --> Preserve[Ancien Tour préservé]\n```\n",
+      "file": "packages/mcp-server/src/mermaid-validation.ts",
+      "pattern": "export async function validateMermaidDescriptions\\(raw: unknown\\): Promise<Issue\\[\\]>"
+    },
+    {
+      "title": "La persistance reste déterministe",
+      "description": "Une fois les étapes, les ancres, Mermaid et le schéma validés, l'écriture passe par un fichier temporaire dans le workspace puis un renommage atomique. Les destinations sont stables : `.tours/project.tour` et `.tours/changes.tour`. Cela rend la commande répétable et évite de laisser un Tour partiellement écrit.",
+      "file": "packages/mcp-server/src/persistence.ts",
+      "pattern": "export async function writeTourAtomic\\("
+    },
+    {
+      "title": "Le renderer transforme la source",
+      "description": "Pendant la lecture, `renderDescription` retrouve les fences Mermaid et les remplace dans le Markdown. Pour chaque diagramme autorisé, il demande un rendu au moteur Mermaid, rasterise le résultat en PNG et l'encode en `data:image/png;base64`. La source Mermaid disparaît donc de la description affichée ; en cas d'échec, l'utilisateur voit un avertissement compact plutôt que le code du diagramme.",
+      "file": "packages/description-renderer/src/description.ts",
+      "pattern": "export async function renderDescription\\("
+    },
+    {
+      "title": "Validation et lecture partagent le même moteur",
+      "description": "`renderMermaidDiagram` centralise le rendu offline, le niveau de sécurité strict, le thème clair ou sombre, le cache mémoire et la rasterisation. Le serveur MCP l'appelle pour valider sans conserver le PNG ; l'extension l'appelle pour afficher le PNG. Ce partage évite qu'un diagramme accepté à la génération échoue systématiquement à la lecture.",
+      "file": "packages/description-renderer/src/render.ts",
+      "pattern": "export function renderMermaidDiagram\\("
+    },
+    {
+      "title": "Le parcours complet",
+      "description": "Pour retenir le fonctionnement global, suivez cette chaîne : l'agent choisit une étape et rédige éventuellement Mermaid ; MCP valide la structure, les ancres et la syntaxe ; la persistance écrit le `.tour` ; l'extension découvre la visite ; le player rend chaque description selon le thème actif.\n\n**Diagram — De l'agent au commentaire VS Code**\n\n```mermaid\nsequenceDiagram\n    participant A as Agent IA\n    participant M as Serveur MCP\n    participant F as Fichier .tour\n    participant E as Extension VS Code\n    participant R as Renderer Mermaid\n    A->>M: create_project_tour\n    M->>R: valider chaque source\n    R-->>M: syntaxe valide ou erreur\n    M->>F: écrire atomiquement\n    E->>F: découvrir et charger\n    E->>R: rendre la description\n    R-->>E: PNG en mémoire\n    E-->>A: commentaire navigable pour le développeur\n```\n",
+      "file": "packages/mcp-server/src/server.ts",
+      "pattern": "async function handleCreateProjectTour\\("
+    }
+  ]
+}
diff --git a/.vscode/launch.json b/.vscode/launch.json
index 1c3d8306..5cb80413 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -5,31 +5,21 @@
 {
 	"version": "0.2.0",
 	"configurations": [{
-			"name": "Run Extension",
-			"type": "extensionHost",
-			"request": "launch",
-			"runtimeExecutable": "${execPath}",
-			"args": [
-				"--extensionDevelopmentPath=${workspaceFolder}"
-			],
-			"outFiles": [
-				"${workspaceFolder}/dist/**/*.js"
-			],
-			"preLaunchTask": "npm: watch"
-		},
-		{
-			"name": "Extension Tests",
+			"name": "Test Extension (Project Tour)",
 			"type": "extensionHost",
 			"request": "launch",
 			"runtimeExecutable": "${execPath}",
 			"args": [
+				"--new-window",
+				"--user-data-dir=${workspaceFolder}/.vscode-test/user-data",
+				"--extensions-dir=${workspaceFolder}/.vscode-test/extensions",
 				"--extensionDevelopmentPath=${workspaceFolder}",
-				"--extensionTestsPath=${workspaceFolder}/out/test"
+				"${workspaceFolder}"
 			],
 			"outFiles": [
-				"${workspaceFolder}/out/test/**/*.js"
+				"${workspaceFolder}/dist/**/*.js"
 			],
-			"preLaunchTask": "npm: watch"
+			"preLaunchTask": "npm: build"
 		}
 	]
 }
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 7946d697..f8280587 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -8,6 +8,6 @@
   "typescript.tsc.autoDetect": "off",
   "editor.formatOnSave": true,
   "editor.codeActionsOnSave": {
-    "source.organizeImports": true
+    "source.organizeImports": "explicit"
   }
 }
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index 76fce04a..58340623 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -5,24 +5,8 @@
 	"tasks": [
 		{
 			"type": "npm",
-			"script": "watch",
-			"presentation": {
-				"echo": true,
-				"reveal": "never",
-				"focus": false,
-				"panel": "shared",
-				"showReuseMessage": true,
-				"clear": false
-			},
-			"runOptions": {
-				"runOn": "folderOpen"
-			},
-			"isBackground": true,
-		},
-		{
-			"type": "npm",
-			"script": "ts-compile",
-			"problemMatcher": "$tsc",
+			"script": "build",
+			"problemMatcher": "$ts-webpack",
 			"presentation": {
 				"echo": true,
 				"reveal": "never",
@@ -33,4 +17,4 @@
 			},
 		}
 	]
-}
\ No newline at end of file
+}
diff --git a/.vscodeignore b/.vscodeignore
index 75620af6..a059f3f9 100644
--- a/.vscodeignore
+++ b/.vscodeignore
@@ -1,13 +1,24 @@
 .tours/**
 .vscode/**
 node_modules/**
+packages/mcp-server/**
+packages/description-renderer/**
 src/**
+scripts/**
+.agents/**
+.codex/**
+AGENTS.md
+CONTEXT.md
+docs/**
 .gitignore
 .space
 package.lock.json
 tsconfig.json
+tsconfig.test.json
 webpack.config.js
 **/*.vsix
 .git/**
 .github/**
-**/*.svg
\ No newline at end of file
+**/*.svg
+dist/extension-web.js*
+dist/test/**
diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 00000000..025089ce
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,13 @@
+## Agent skills
+
+### Suivi des tickets
+
+Les tickets sont suivis dans les GitHub Issues de ce dépôt. Voir `docs/agents/issue-tracker.md`.
+
+### Libellés de triage
+
+Le triage utilise les cinq libellés standards des compétences Matt Pocock. Voir `docs/agents/triage-labels.md`.
+
+### Documentation du domaine
+
+Ce dépôt utilise une organisation à contexte unique. Voir `docs/agents/domain.md`.
diff --git a/CONTEXT.md b/CONTEXT.md
new file mode 100644
index 00000000..2f4156a3
--- /dev/null
+++ b/CONTEXT.md
@@ -0,0 +1,33 @@
+# AI-Generated Code Tours
+
+This context defines the guided explanations generated by an AI agent to help developers understand a codebase or a set of changes.
+
+## Language
+
+**Project Tour**:
+A guided explanation of a codebase's purpose, structure, and important execution paths for a developer discovering the project.
+_Avoid_: Global tour, architecture tour
+
+**Changes Tour**:
+A guided explanation of the intent, implementation, and impact of the committed changes on a branch since it diverged from its base. Uncommitted changes are excluded unless explicitly included.
+_Avoid_: Change mode, diff tour, branch tour
+
+**Tour**:
+An ordered sequence of contextual explanations attached to relevant locations in a codebase.
+_Avoid_: Walkthrough file, generated documentation
+
+**Tour Anchor**:
+A stable location in the codebase that associates a Tour step with the code or directory it explains.
+_Avoid_: Pointer, target
+
+**Tour Generator**:
+An AI agent that analyzes a workspace and proposes a Project Tour or Changes Tour through CodeTour's MCP tools.
+_Avoid_: MCP client, tour writer
+
+**Mermaid Diagram**:
+A visual explanation whose Mermaid source is embedded in a Tour's explanatory Markdown and rendered by CodeTour for the reader.
+_Avoid_: Schema, generated image
+
+**Tour Workspace**:
+The single project directory that a Tour Generator is allowed to inspect and in which generated Tours are persisted.
+_Avoid_: Workspace root argument, current folder
diff --git a/README.md b/README.md
index 46fafad7..3086cf5f 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,16 @@
 # CodeTour 🗺️
 
+## AI-generated tours
+
+The desktop extension includes a local MCP server with tools for generating a
+Project Tour or a Changes Tour. VS Code and GitHub Copilot discover one confined
+server per workspace folder automatically; no `.vscode/mcp.json` file is
+required. The server is bundled in the VSIX and never accesses the network.
+
+To use the same tools in Codex, run `CodeTour: Configure MCP for Codex` from the
+Command Palette. If the extension was moved or updated and Codex still points
+to an older bundle, run `CodeTour: Repair MCP Configuration for Codex`.
+
 CodeTour is a Visual Studio Code extension, which allows you to record and play back guided walkthroughs of your codebases. It's like a table of contents, that can make it easier to onboard (or re-board!) to a new project/feature area, visualize bug reports, or understand the context of a code review/PR change. A "code tour" is simply a series of interactive steps, each of which are associated with a specific directory, or file/line, and include a description of the respective code. This allows developers to clone a repo, and then immediately start **learning it**, without needing to refer to a `CONTRIBUTING.md` file and/or rely on help from others. Tours can either be checked into a repo, to enable sharing with other contributors, or [exported](#exporting-tours) to a "tour file", which allows anyone to replay the same tour, without having to clone any code to do it!
 
 <img width="800px" src="https://user-images.githubusercontent.com/116461/76165260-c6c00500-6112-11ea-9cda-0a6cb9b72e8f.gif" />
diff --git a/ROADMAP.md b/ROADMAP.md
new file mode 100644
index 00000000..5402907b
--- /dev/null
+++ b/ROADMAP.md
@@ -0,0 +1,73 @@
+# Roadmap
+
+L'objectif est de proposer des Tours générés par une IA pour expliquer un projet ou les changements apportés à son code.
+
+## Bugs connus
+
+- [ ] Redimensionner automatiquement l'image d'un diagramme Mermaid en fonction de l'espace disponible dans le commentaire ou la surface de prévisualisation, sans provoquer de débordement ni rendre le texte illisible.
+
+## Priorité 1 — Modes de génération
+
+### Project Tour
+
+Expliquer le rôle du projet, sa structure et ses principaux parcours d'exécution.
+
+- [ ] Définir les informations minimales attendues dans un Project Tour.
+- [ ] Générer un parcours progressif allant du point d'entrée vers les modules importants.
+- [ ] Vérifier que les Tour Anchors restent pertinents lorsque le code évolue.
+- [ ] Ajouter un exemple de Project Tour dans la documentation.
+
+### Explication de la review
+
+Présenter les remarques d'une revue de code, leur contexte et les corrections attendues.
+
+- [ ] Définir la source de la review : commentaires locaux, GitHub Issues ou pull request.
+- [ ] Déterminer si cette fonctionnalité doit être un mode distinct ou une présentation spécialisée du Changes Tour.
+- [ ] Associer chaque remarque à un Tour Anchor et indiquer sa priorité.
+- [ ] Distinguer clairement les problèmes, les suggestions et les points positifs.
+- [ ] Prévoir le comportement lorsqu'une remarque ne peut pas être associée à une ligne stable.
+
+### Changes Tour
+
+Expliquer l'intention, l'implémentation et l'impact des changements depuis la divergence avec la branche de base.
+
+- [ ] Détecter et afficher clairement la branche ou la référence de base utilisée.
+- [ ] Regrouper les changements par intention plutôt que par ordre des fichiers.
+- [ ] Signaler les changements non commités lorsqu'ils sont explicitement inclus.
+- [ ] Mettre en évidence les impacts sur les tests, la configuration et les migrations.
+- [ ] Ajouter un exemple de Changes Tour dans la documentation.
+
+## Priorité 2 — Qualité des Tours
+
+- [ ] Définir des critères de qualité communs : exactitude, concision, ordre pédagogique et pertinence des Tour Anchors.
+- [ ] Ajouter des tests d'intégration pour chaque mode et pour leurs principaux cas d'erreur.
+- [ ] Vérifier les Tours générés sur plusieurs structures de dépôt représentatives.
+- [ ] Fournir des erreurs actionnables lorsqu'un fichier, une référence Git ou un Tour Anchor est invalide.
+- [ ] Permettre de prévisualiser puis de confirmer le remplacement d'un Tour généré existant.
+
+### Tests unitaires de l'extension VS Code
+
+- [ ] Installer et configurer un framework de tests unitaires compatible avec TypeScript et les modules de l'extension.
+- [ ] Séparer la logique métier des dépendances directes à VS Code afin qu'elle puisse être testée sans lancer l'éditeur.
+- [ ] Créer des adapters minimaux pour simuler les interfaces VS Code uniquement lorsqu'elles varient réellement dans les tests.
+- [ ] Tester en priorité le chargement, la validation, la navigation et la mise à jour des Tours.
+- [ ] Tester la résolution des Tour Anchors ainsi que les cas de fichiers ou de lignes devenus introuvables.
+- [ ] Tester la génération du contenu de prévisualisation et les principaux cas limites Markdown.
+- [ ] Tester les erreurs liées à Git et aux références associées aux Changes Tours.
+- [ ] Ajouter une commande `test:unit` et l'intégrer à la commande globale `npm test`.
+- [ ] Exécuter les tests unitaires dans l'intégration continue et publier un rapport exploitable en cas d'échec.
+- [ ] Définir un objectif de couverture initial centré sur les modules critiques, sans imposer un pourcentage global artificiel.
+
+## Priorité 3 — Simplification et maintenance
+
+- [ ] Auditer la fonctionnalité d'ouverture d'un Tour par URL, ses usages et ses dépendances.
+- [ ] La supprimer si elle n'est plus utile et si cela simplifie l'interface et l'implémentation du projet.
+- [ ] Nettoyer les commandes, dépendances, tests et éléments de documentation devenus inutiles après sa suppression.
+- [ ] Centraliser la validation et la persistance partagées par les modes de génération derrière une interface réduite.
+- [ ] Documenter les décisions structurantes dans un ADR lorsqu'un choix modifie les contrats existants.
+
+## Plus tard
+
+- [ ] Étudier l'historique des Tours sans remettre en cause les fichiers générés stables de la version actuelle.
+- [ ] Évaluer les Tours interactifs et conditionnels avec des règles de sécurité explicites.
+- [ ] Recueillir des métriques locales et anonymes sur les erreurs de génération avant toute télémétrie éventuelle.
diff --git a/docs/adr/0001-expose-two-specialized-tour-generation-tools.md b/docs/adr/0001-expose-two-specialized-tour-generation-tools.md
new file mode 100644
index 00000000..49e302bc
--- /dev/null
+++ b/docs/adr/0001-expose-two-specialized-tour-generation-tools.md
@@ -0,0 +1,3 @@
+# Expose two specialized tour generation tools
+
+The MCP server exposes `create_project_tour` and `create_changes_tour` instead of one tool with a mode parameter. Distinct tools make each intent discoverable to AI agents and allow their contracts to evolve independently, while both delegate validation and persistence to shared internal logic. The AI agent analyzes and writes the tour content; the MCP server deterministically validates and persists it.
diff --git a/docs/adr/0002-use-stable-generated-tour-files.md b/docs/adr/0002-use-stable-generated-tour-files.md
new file mode 100644
index 00000000..704a3f73
--- /dev/null
+++ b/docs/adr/0002-use-stable-generated-tour-files.md
@@ -0,0 +1,3 @@
+# Use stable generated tour files
+
+Generated tours use the stable destinations `.tours/project.tour` and `.tours/changes.tour`, and each generation atomically replaces the corresponding file. This favors a predictable one-command workflow over retaining generation history; version control remains responsible for recovering earlier content.
diff --git a/docs/adr/0003-limit-v1-tours-to-safe-content.md b/docs/adr/0003-limit-v1-tours-to-safe-content.md
new file mode 100644
index 00000000..5ca9dbc2
--- /dev/null
+++ b/docs/adr/0003-limit-v1-tours-to-safe-content.md
@@ -0,0 +1,3 @@
+# Limit V1 tours to safe content
+
+The first MCP version accepts only explanatory Markdown and locations inside the workspace; it rejects CodeTour `commands`, root-level `when` expressions, and external `uri` steps. Markdown may contain ordinary HTTPS links and images, but active schemes such as `command:`, `file:`, `vscode:`, and `javascript:` are rejected. The excluded CodeTour capabilities can be valuable for interactive tutorials and conditional tours, so they remain candidates for V2, but enabling them requires explicit security rules because generated tours could otherwise execute editor or terminal actions, evaluate dynamic conditions, or open external resources.
diff --git a/docs/adr/0004-use-different-git-reference-policies-by-tour-type.md b/docs/adr/0004-use-different-git-reference-policies-by-tour-type.md
new file mode 100644
index 00000000..f022c203
--- /dev/null
+++ b/docs/adr/0004-use-different-git-reference-policies-by-tour-type.md
@@ -0,0 +1,3 @@
+# Use different Git reference policies by tour type
+
+A Project Tour is generated without a CodeTour `ref` so it remains usable as the codebase evolves. By default, a Changes Tour records the exact analyzed `HEAD` commit SHA as its `ref`, and generation fails if `HEAD` changed after analysis; this trades editability across checkouts for a reproducible explanation whose file contents and Tour Anchors match the reviewed snapshot. When uncommitted changes are explicitly included, the Changes Tour has no `ref` and carries a warning that it describes a non-reproducible local state.
diff --git a/docs/adr/0005-run-a-workspace-confined-stdio-mcp-server.md b/docs/adr/0005-run-a-workspace-confined-stdio-mcp-server.md
new file mode 100644
index 00000000..9082de71
--- /dev/null
+++ b/docs/adr/0005-run-a-workspace-confined-stdio-mcp-server.md
@@ -0,0 +1,3 @@
+# Run a workspace-confined stdio MCP server
+
+The MCP server is a standalone Node.js package under `packages/mcp-server/`, launched locally over `stdio` and confined to exactly one workspace. The original decision required a proprietary `--workspace-root` argument; ADR-0006 supersedes that launch mechanism. The server performs no network access, and it resolves real paths and rejects symlinks that escape the configured root before any read or write. HTTP transport and multi-root instances are deferred beyond V1.
diff --git a/docs/adr/0006-distribute-and-discover-the-mcp-server-with-the-extension.md b/docs/adr/0006-distribute-and-discover-the-mcp-server-with-the-extension.md
new file mode 100644
index 00000000..5cca1557
--- /dev/null
+++ b/docs/adr/0006-distribute-and-discover-the-mcp-server-with-the-extension.md
@@ -0,0 +1,5 @@
+# Distribute and discover the MCP server with the extension
+
+The VS Code extension bundles the compiled stdio MCP server and registers one server definition per workspace folder so GitHub Copilot discovers it without project configuration. The server derives its single workspace from the process working directory instead of a CodeTour-specific `--workspace-root` argument; this also lets a global Codex registration work in every task because Codex starts it in the task directory. CodeTour exposes explicit configure and repair commands for Codex, whose global registry cannot discover servers contributed by a VS Code extension. This supersedes the launch mechanism in ADR-0005 while preserving its confinement and transport decisions.
+
+The MCP server definition API requires VS Code 1.101, so the extension's minimum VS Code version moves to 1.101. In that API version, `CommentThread.range` is optional. Existing player and recorder code therefore checks that a source range exists before navigating to or recording a file step: player focus becomes a no-op without a navigable range, while recording reports an explicit error. These are compatibility adjustments caused by the required API upgrade, not changes to MCP behavior.
diff --git a/docs/adr/0007-render-mermaid-diagrams-within-codetour.md b/docs/adr/0007-render-mermaid-diagrams-within-codetour.md
new file mode 100644
index 00000000..2bc893ec
--- /dev/null
+++ b/docs/adr/0007-render-mermaid-diagrams-within-codetour.md
@@ -0,0 +1,17 @@
+# Render Mermaid diagrams within CodeTour
+
+CodeTour stores Mermaid source in fenced `mermaid` blocks inside a Tour's existing Markdown descriptions and renders diagrams itself, without requiring another VS Code extension or committing generated images. The Tour Generator's MCP tools validate Mermaid before writing a generated Tour, using the same exact, locked Mermaid version and diagram rules as playback. During playback, CodeTour renders with strict security, disables interactive links and HTML, and adapts the result to the active theme: Mermaid produces a theme-aware SVG internally, which CodeTour sanitizes as defense in depth and rasterizes in memory. Native comments transport the diagram as a `data:image/png;base64` image in the final Markdown, because SVG data URIs and in-memory filesystem URIs did not display as images in native comments. A rendering failure shows a compact warning and the diagram's alternative text without exposing its source, and no generated SVG or PNG file is ever written.
+
+A Mermaid Diagram is introduced by a visible Markdown caption of the form `**Diagram — …**`, which also provides its alternative text. The first version accepts `flowchart`, `sequenceDiagram`, `stateDiagram-v2`, `classDiagram`, and `erDiagram`. A single Markdown description may contain at most three diagrams, and each Mermaid source may contain at most 20 KB. Changing the active VS Code theme invalidates the render cache, immediately refreshes the visible Tour step and Tour tree, and leaves other diagrams to be regenerated on demand. Diagrams in the same description render independently, so one failure does not hide successful diagrams. Mermaid fences are excluded from CodeTour's existing `Insert Code` transformation.
+
+Packaging must account for the rasterizer's native code: `@resvg/resvg-js` ships platform-specific binaries, so the webpack build externalizes it and requires it at runtime, a dependency-free VSIX omits it entirely, and naively including its dependency tree produced a ~38 MB / 9,104-file package. Deliberate per-platform packaging of the rasterizer is therefore deferred to its own decision.
+
+```mermaid
+flowchart LR
+    Generator[Tour Generator] -->|proposes Mermaid source| MCP[CodeTour MCP tools]
+    MCP -->|validates with the locked Mermaid| Tour[Tour file]
+    Tour -->|reads the fenced Mermaid block| Renderer[CodeTour Mermaid renderer]
+    Renderer -->|strict, theme-aware SVG| Cache[In-memory cache]
+    Cache -->|in-memory PNG as a data URI image| Surface[Markdown description surfaces]
+    Renderer -->|rendering failure| Fallback[Warning and alternative text]
+```
diff --git a/docs/adr/0008-drop-vscode-web-support.md b/docs/adr/0008-drop-vscode-web-support.md
new file mode 100644
index 00000000..6d90d60e
--- /dev/null
+++ b/docs/adr/0008-drop-vscode-web-support.md
@@ -0,0 +1,5 @@
+# Drop VS Code Web support
+
+CodeTour targets the Node-based VS Code extension host and no longer builds or publishes a browser extension. The manifest exposes only the Node `main` entry point, the build emits the Node extension and the bundled MCP server with no Web Worker bundle, and the Web-specific desktop-integration shim and the `os-browserify`/`path-browserify` fallbacks are deleted. Packaging and CI verify that no web artifact reaches the VSIX.
+
+Desktop VS Code remains supported locally and through remote Node extension hosts such as SSH, Dev Containers, and Codespaces; `extensionKind: ["workspace"]` is unchanged. The `isWeb` property of a tour's `when` expression context is retained and now always evaluates to `false`.
diff --git a/docs/adr/0009-pin-the-development-and-ci-node-toolchain.md b/docs/adr/0009-pin-the-development-and-ci-node-toolchain.md
new file mode 100644
index 00000000..efb018d3
--- /dev/null
+++ b/docs/adr/0009-pin-the-development-and-ci-node-toolchain.md
@@ -0,0 +1,5 @@
+# Pin the development and CI Node toolchain
+
+The packaged MCP server integration test exposed a behavioral difference between npm 10 and npm 12: npm 10 ran the `prepare` script of a dependency supplied from an installed local directory despite `--ignore-scripts`, while npm 12 did not. CodeTour therefore uses Node.js 24.18.0 and npm 12.0.1 for local development, pull-request tests, and releases; `.nvmrc`, `.node-version`, the root `packageManager` and Volta declarations, and both GitHub Actions workflows record the same versions.
+
+Changing either tool is an explicit toolchain upgrade: update every declaration together and run the full cross-platform workflow before accepting the change. This favors reproducible installs and tests over silently supporting whichever Node.js and npm versions happen to be present on a developer machine or runner.
diff --git a/docs/agents/domain.md b/docs/agents/domain.md
new file mode 100644
index 00000000..a5c586f7
--- /dev/null
+++ b/docs/agents/domain.md
@@ -0,0 +1,51 @@
+# Documentation du domaine
+
+Ce document explique comment les compétences d’ingénierie doivent consulter la documentation du domaine avant d’explorer le code.
+
+## Documents à lire avant l’exploration
+
+- **`CONTEXT.md`** à la racine du dépôt ; ou
+- **`CONTEXT-MAP.md`** à la racine, s’il existe : il référence un fichier `CONTEXT.md` par contexte. Lire tous ceux qui concernent le sujet étudié ;
+- **`docs/adr/`** : lire les ADR qui concernent la zone sur laquelle le travail va porter. Dans un dépôt à contextes multiples, vérifier également les décisions propres à chaque contexte sous `src/<contexte>/docs/adr/`.
+
+Si l’un de ces fichiers n’existe pas, continuer silencieusement. Ne pas signaler son absence et ne pas proposer de le créer à l’avance. La compétence `/domain-modeling`, appelée notamment par `/grill-with-docs` et `/improve-codebase-architecture`, crée ces documents progressivement lorsque des termes ou des décisions sont effectivement clarifiés.
+
+## Structure des fichiers
+
+Ce dépôt utilise un contexte unique :
+
+```text
+/
+├── CONTEXT.md
+├── docs/adr/
+│   ├── 0001-event-sourced-orders.md
+│   └── 0002-postgres-for-write-model.md
+└── src/
+```
+
+Dans un dépôt à contextes multiples, la présence de `CONTEXT-MAP.md` à la racine indique l’organisation suivante :
+
+```text
+/
+├── CONTEXT-MAP.md
+├── docs/adr/                          ← décisions qui concernent tout le système
+└── src/
+    ├── ordering/
+    │   ├── CONTEXT.md
+    │   └── docs/adr/                  ← décisions propres au contexte
+    └── billing/
+        ├── CONTEXT.md
+        └── docs/adr/
+```
+
+## Employer le vocabulaire du glossaire
+
+Lorsqu’une sortie nomme un concept du domaine, par exemple dans le titre d’un ticket, une proposition de refactorisation, une hypothèse ou le nom d’un test, utiliser le terme défini dans `CONTEXT.md`. Ne pas employer les synonymes explicitement déconseillés par le glossaire.
+
+Si le concept nécessaire n’existe pas encore dans le glossaire, il faut soit reconsidérer un terme qui n’appartient peut-être pas au projet, soit noter une véritable lacune à traiter avec `/domain-modeling`.
+
+## Signaler les conflits avec les ADR
+
+Si une proposition contredit un ADR existant, le signaler explicitement au lieu de remplacer silencieusement la décision :
+
+> _Contredit ADR-0007 (commandes fondées sur des événements), mais mérite d’être reconsidéré parce que…_
diff --git a/docs/agents/issue-tracker.md b/docs/agents/issue-tracker.md
new file mode 100644
index 00000000..7747958b
--- /dev/null
+++ b/docs/agents/issue-tracker.md
@@ -0,0 +1,45 @@
+# Suivi des tickets : GitHub
+
+Les tickets et les spécifications de ce dépôt sont enregistrés dans les GitHub Issues. Utiliser la CLI `gh` pour toutes les opérations.
+
+## Conventions
+
+- **Créer un ticket** : `gh issue create --title "..." --body "..."`. Utiliser un heredoc pour les descriptions multilignes.
+- **Lire un ticket** : `gh issue view <numéro> --comments`, en filtrant les commentaires avec `jq` et en récupérant également les libellés.
+- **Lister les tickets** : `gh issue list --state open --json number,title,body,labels,comments --jq '[.[] | {number, title, body, labels: [.labels[].name], comments: [.comments[].body]}]'`, avec les filtres `--label` et `--state` appropriés.
+- **Commenter un ticket** : `gh issue comment <numéro> --body "..."`.
+- **Ajouter ou retirer des libellés** : `gh issue edit <numéro> --add-label "..."` / `--remove-label "..."`.
+- **Fermer un ticket** : `gh issue close <numéro> --comment "..."`.
+
+Déduire le dépôt à partir de `git remote -v` ; `gh` le fait automatiquement lorsqu’il est exécuté dans un clone.
+
+## Pull requests comme surface de triage
+
+**PR comme surface de demandes : non.** _(Passer cette valeur à `oui` si ce dépôt traite les PR externes comme des demandes de fonctionnalité ; `/triage` lit cette option.)_
+
+Lorsque cette option vaut `oui`, les PR suivent les mêmes libellés et états que les tickets, au moyen des commandes `gh pr` équivalentes :
+
+- **Lire une PR** : `gh pr view <numéro> --comments` et `gh pr diff <numéro>` pour le diff.
+- **Lister les PR externes à trier** : `gh pr list --state open --json number,title,body,labels,author,authorAssociation,comments`, puis ne conserver que les valeurs `CONTRIBUTOR`, `FIRST_TIME_CONTRIBUTOR` ou `NONE` de `authorAssociation` et exclure `OWNER`, `MEMBER` et `COLLABORATOR`.
+- **Commenter, étiqueter ou fermer** : `gh pr comment`, `gh pr edit --add-label` / `--remove-label`, `gh pr close`.
+
+GitHub partage la même séquence de numéros entre les tickets et les PR. Une référence comme `#42` peut donc désigner l’un ou l’autre : essayer `gh pr view 42`, puis `gh issue view 42` en cas d’échec.
+
+## Lorsqu’une compétence demande de publier dans le suivi des tickets
+
+Créer un ticket GitHub.
+
+## Lorsqu’une compétence demande de récupérer le ticket concerné
+
+Exécuter `gh issue view <numéro> --comments`.
+
+## Opérations de repérage
+
+Ces opérations sont utilisées par `/wayfinder`. La **carte** est un ticket unique dont les **tickets enfants** représentent les travaux à réaliser.
+
+- **Carte** : un ticket portant le libellé `wayfinder:map` et contenant les sections Notes, Décisions prises et Zones d’incertitude. Le créer avec `gh issue create --label wayfinder:map`.
+- **Ticket enfant** : un ticket lié à la carte comme sous-ticket GitHub au moyen de `gh api` et de l’API des sous-tickets. Si les sous-tickets ne sont pas disponibles, ajouter l’enfant à une liste de tâches dans la description de la carte et placer `Part of #<carte>` au début de sa description. Utiliser un libellé `wayfinder:<type>` parmi `research`, `prototype`, `grilling` et `task`. Une fois réclamé, assigner le ticket au développeur qui conduit le travail.
+- **Blocage** : utiliser les dépendances natives de tickets GitHub, représentation canonique et visible dans l’interface. Ajouter une dépendance avec `gh api --method POST repos/<propriétaire>/<dépôt>/issues/<enfant>/dependencies/blocked_by -F issue_id=<id-bdd-bloquant>`, où `<id-bdd-bloquant>` est l’identifiant numérique de base de données du ticket bloquant obtenu avec `gh api repos/<propriétaire>/<dépôt>/issues/<n> --jq .id`, et non son numéro `#n` ni son `node_id`. GitHub expose les blocages ouverts dans `issue_dependencies_summary.blocked_by`. Si les dépendances ne sont pas disponibles, utiliser une ligne `Blocked by: #<n>, #<n>` au début de la description. Un ticket est débloqué lorsque tous ses bloqueurs sont fermés.
+- **Recherche du prochain ticket** : lister les enfants ouverts de la carte avec `gh issue list --state open`, limiter le résultat aux sous-tickets ou à la liste de tâches de la carte, puis exclure les tickets ayant un bloqueur ouvert ou un responsable. Le premier ticket dans l’ordre de la carte est retenu.
+- **Réclamer un ticket** : `gh issue edit <n> --add-assignee @me`. Il s’agit de la première écriture de la session.
+- **Résoudre un ticket** : ajouter la réponse avec `gh issue comment <n> --body "<réponse>"`, fermer le ticket avec `gh issue close <n>`, puis ajouter dans la section Décisions prises de la carte un pointeur de contexte accompagné de son lien.
diff --git a/docs/agents/triage-labels.md b/docs/agents/triage-labels.md
new file mode 100644
index 00000000..6d296307
--- /dev/null
+++ b/docs/agents/triage-labels.md
@@ -0,0 +1,15 @@
+# Libellés de triage
+
+Les compétences utilisent cinq rôles de triage canoniques. Ce fichier associe ces rôles aux libellés réellement employés dans le suivi des tickets de ce dépôt.
+
+| Libellé dans mattpocock/skills | Libellé dans notre suivi | Signification |
+| ------------------------------ | ------------------------- | ------------- |
+| `needs-triage` | `needs-triage` | Un mainteneur doit évaluer ce ticket |
+| `needs-info` | `needs-info` | En attente d’informations supplémentaires de la personne ayant signalé le problème |
+| `ready-for-agent` | `ready-for-agent` | Entièrement spécifié et prêt à être traité par un agent autonome |
+| `ready-for-human` | `ready-for-human` | Nécessite une implémentation humaine |
+| `wontfix` | `wontfix` | Ne sera pas traité |
+
+Lorsqu’une compétence mentionne un rôle, par exemple « appliquer le libellé prêt pour un agent autonome », utiliser le libellé correspondant dans ce tableau.
+
+Modifier la colonne centrale si le vocabulaire du suivi des tickets évolue.
diff --git a/docs/mermaid-tour-generation-fix-plan.md b/docs/mermaid-tour-generation-fix-plan.md
new file mode 100644
index 00000000..2267e4c5
--- /dev/null
+++ b/docs/mermaid-tour-generation-fix-plan.md
@@ -0,0 +1,129 @@
+# Problèmes rencontrés et plan de correction
+
+## Contexte
+
+Un Project Tour a été généré pour expliquer le fonctionnement de CodeTour, avec un accent sur la génération et le rendu des diagrammes Mermaid.
+
+La génération finale a réussi et a produit un tour de 10 étapes dans `.tours/project.tour`. Ce document décrit les difficultés rencontrées pendant cette opération et le plan précis pour rendre le processus plus robuste. Aucun correctif de code n'est inclus dans ce document.
+
+## Problèmes rencontrés
+
+### 1. Ancres `pattern` refusées par le serveur MCP
+
+Le serveur MCP valide chaque ancre contre le contenu réel du workspace. Deux ancres ont été refusées :
+
+- l'ancre de `discoverTours` dans `src/store/provider.ts` ;
+- l'ancre de `renderMermaidDiagram` dans `packages/description-renderer/src/render.ts` lors d'une première tentative.
+
+La cause était une différence entre le motif regex proposé et la forme exacte reconnue par le validateur. Le serveur exige qu'un motif corresponde à exactement une occurrence. Une proposition invalide ne remplace pas l'ancien fichier, ce qui a correctement protégé le tour existant.
+
+L'ancre de `discoverTours` a continué à être refusée malgré une signature visible dans la recherche. Pour terminer le tour sans ancre fragile, cette étape secondaire a été retirée de la proposition finale.
+
+### 2. Première exécution du build interrompue par l'environnement
+
+La première exécution de `npm run build` s'est arrêtée avec le code 130 après le build du renderer et du serveur MCP. Elle n'a pas fourni d'erreur de compilation exploitable.
+
+Le build a été relancé avec une exécution adaptée et a réussi jusqu'au bout :
+
+- build de `packages/description-renderer` ;
+- build de `packages/mcp-server` ;
+- compilation webpack de l'extension ;
+- préparation du runtime `resvg`.
+
+Il s'agissait donc d'une interruption d'exécution, pas d'un défaut identifié dans le code ou dans le tour généré.
+
+### 3. Risque de dépendance entre validation et rendu
+
+Mermaid est validé lors de la génération par le serveur MCP, puis rendu plus tard par l'extension. Le projet prévoit déjà un moteur partagé, mais cette double étape reste un point de vigilance : une divergence de version, de configuration ou de règles pourrait accepter un diagramme à la génération et le faire échouer à la lecture.
+
+Le tour final explique ce partage, mais le plan ci-dessous propose de le protéger explicitement par des tests de contrat.
+
+## Plan précis de correction
+
+### Étape 1 - Rendre la préparation des ancres déterministe
+
+**Objectif :** éviter les refus dus à des motifs approximatifs.
+
+1. Lire la signature exacte depuis le fichier ciblé, sans la reconstruire de mémoire.
+2. Vérifier le nombre d'occurrences du motif dans le fichier.
+3. Utiliser en priorité un motif stable et unique.
+4. Utiliser une ligne explicite uniquement lorsque le motif stable ne peut pas être rendu unique.
+5. Éviter de supprimer une étape simplement parce qu'une ancre est difficile à écrire ; documenter plutôt le choix de l'ancre de repli.
+
+**Validation attendue :** chaque ancre du tour est acceptée par le validateur et correspond à une seule cible réelle.
+
+### Étape 2 - Ajouter une vérification locale avant l'appel MCP
+
+**Objectif :** détecter immédiatement les motifs invalides.
+
+1. Parcourir les étapes proposées avant l'appel à `create_project_tour`.
+2. Pour chaque étape avec `file` et `pattern`, compter les correspondances dans le fichier.
+3. Signaler localement les cas `0 occurrence` et `plusieurs occurrences`.
+4. Afficher le fichier, le motif et le nombre trouvé dans le message d'erreur.
+5. Ne soumettre au serveur MCP que les propositions qui passent cette vérification.
+
+**Validation attendue :** une ancre incorrecte est détectée avant l'écriture ou l'appel de génération, avec un message actionnable.
+
+### Étape 3 - Tester les ancres représentatives du tour
+
+**Objectif :** couvrir les types de cibles utilisés par les Project Tours.
+
+Ajouter ou vérifier des tests pour :
+
+- une cible de type `directory` ;
+- un fichier avec un motif unique ;
+- un motif absent ;
+- un motif ambigu ;
+- une ligne explicite utilisée comme solution de repli.
+
+**Validation attendue :** le validateur conserve un comportement strict et ses erreurs indiquent clairement la cause.
+
+### Étape 4 - Garantir le contrat Mermaid génération/lecture
+
+**Objectif :** vérifier que ce qui est accepté par MCP est lisible par l'extension.
+
+1. Maintenir une liste commune des types Mermaid autorisés.
+2. Valider les mêmes limites des deux côtés : légende, taille maximale de 20 KB et trois diagrammes maximum par description.
+3. Tester chaque type accepté : `flowchart`, `sequenceDiagram`, `stateDiagram-v2`, `classDiagram` et `erDiagram`.
+4. Vérifier que la validation MCP et le rendu player utilisent la même version verrouillée de Mermaid.
+5. Tester un diagramme invalide et confirmer que le texte alternatif et l'avertissement sont affichés sans exposer la source Mermaid.
+
+**Validation attendue :** tout diagramme accepté par MCP est rendu par le player, sauf erreur de rendu explicitement signalée.
+
+### Étape 5 - Vérifier le comportement de persistance
+
+**Objectif :** préserver un tour valide lorsqu'une nouvelle génération échoue.
+
+1. Générer un tour valide de référence.
+2. Soumettre une proposition avec une ancre invalide ou une source Mermaid invalide.
+3. Vérifier que l'opération retourne toutes les erreurs détectées.
+4. Vérifier que `.tours/project.tour` contient toujours l'ancien tour valide.
+5. Soumettre ensuite une proposition valide et vérifier le remplacement atomique.
+
+**Validation attendue :** aucune proposition partiellement invalide ne laisse un fichier `.tour` incomplet.
+
+### Étape 6 - Stabiliser la validation du build
+
+**Objectif :** distinguer les interruptions d'environnement des erreurs du projet.
+
+1. Exécuter `npm run build` dans un terminal standard.
+2. En cas d'arrêt sans erreur de compilation, relever le code de sortie et la dernière étape exécutée.
+3. Relancer dans un environnement non interrompu avant d'ouvrir une investigation de code.
+4. Conserver dans le rapport les sorties des étapes renderer, MCP, webpack et resvg.
+5. Ne traiter comme régression que les erreurs reproductibles après un second lancement.
+
+**Validation attendue :** deux exécutions consécutives terminent avec succès, ou toute défaillance restante est reproductible et localisée.
+
+## Critères d'acceptation
+
+- Les Project Tours générés ne contiennent que des ancres validées et uniques.
+- Les erreurs de motif indiquent le fichier, le motif et la cause.
+- Les cinq types Mermaid autorisés sont couverts par des tests de validation et de rendu.
+- Une erreur Mermaid n'efface pas un tour existant valide.
+- Les sources Mermaid sont remplacées par des images PNG en mémoire pendant la lecture.
+- Le build complet passe après génération du tour.
+- Le fichier de documentation est le seul livrable ajouté par ce plan ; aucune modification de code n'est demandée ici.
+
+## Résultat actuel
+
+Le Project Tour final a été créé avec succès après correction de la proposition d'ancres. Les diagrammes Mermaid ont été validés par le serveur MCP, et le build complet a réussi lors de la seconde exécution.
diff --git a/docs/release.md b/docs/release.md
new file mode 100644
index 00000000..a8cd5697
--- /dev/null
+++ b/docs/release.md
@@ -0,0 +1,47 @@
+# Node extension release qualification
+
+CodeTour is packaged as a Node extension for desktop VS Code and desktop VS Code
+remote workspaces. VS Code Web is intentionally unsupported.
+
+## Platform targets
+
+Each VSIX contains the native `@resvg/resvg-js` runtime for the host that built
+it. The supported targets are:
+
+| Host target | Native package |
+| --- | --- |
+| `darwin-arm64` / `darwin-x64` | macOS arm64 / x64 |
+| `linux-arm64` / `linux-x64` | Linux arm64 / x64 (glibc) |
+| `win32-arm64` / `win32-x64` | Windows arm64 / x64 |
+
+The packaging command refuses to produce a target different from the current
+Node host. This prevents accidentally shipping a native binary that cannot be
+loaded by the target platform.
+
+## Local qualification
+
+From a clean checkout, install the root, renderer, and MCP dependencies, then
+run:
+
+```sh
+npm ci
+npm ci --prefix packages/description-renderer
+npm ci --prefix packages/mcp-server
+npm run package
+```
+
+`npm run package` builds the renderer and MCP server, stages only the selected
+rasterizer runtime, creates `codetour-<target>-<version>.vsix`, extracts it into
+a temporary directory, renders an SVG through the unpacked native binary, and
+starts the unpacked MCP server with `--version`. It also rejects a browser
+manifest, the removed `extension-web` artifact, missing binaries, oversized
+archives, and unexpectedly large file counts.
+
+The CI workflow runs this qualification on macOS, Ubuntu, and Windows and
+uploads one target-specific VSIX per runner. The release workflow packages and
+publishes the same three platform artifacts independently.
+
+Before a release, manually verify a local desktop workspace and one remote Node
+workspace with all five supported Mermaid diagram types. Switch between light
+and dark themes while a diagram is visible and confirm the rendered image is
+refreshed. No browser or Web Worker artifact should be present.
diff --git a/package-lock.json b/package-lock.json
index 54c0d1c4..d217e69f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,30 +9,29 @@
       "version": "0.0.59",
       "license": "MIT",
       "dependencies": {
+        "@resvg/resvg-js": "2.6.2",
         "@types/jexl": "^2.2.0",
         "axios": "^0.21.4",
         "jexl": "^2.3.0",
         "mobx": "^5.14.2",
-        "os-browserify": "0.3.0",
-        "path-browserify": "1.0.1",
         "throttle-debounce": "^3.0.1",
         "vsls": "^1.0.2532"
       },
       "devDependencies": {
         "@types/node": "^18.14.0",
         "@types/throttle-debounce": "^5.0.0",
-        "@types/vscode": "^1.60",
+        "@types/vscode": "1.101.0",
         "@vscode/vsce": "^2.17.0",
         "debug": "^4.3.4",
         "eslint": "^8.34.0",
         "ts-loader": "^9.4.2",
-        "typescript": "^4.9.5",
+        "typescript": "4.9.5",
         "webpack": "^5.75.0",
         "webpack-cli": "^5.0.1",
         "webpack-merge": "^5.8.0"
       },
       "engines": {
-        "vscode": "^1.60.0"
+        "vscode": "^1.101.0"
       }
     },
     "node_modules/@babel/runtime": {
@@ -243,6 +242,233 @@
         "node": ">= 8"
       }
     },
+    "node_modules/@resvg/resvg-js": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/@resvg/resvg-js/-/resvg-js-2.6.2.tgz",
+      "integrity": "sha512-xBaJish5OeGmniDj9cW5PRa/PtmuVU3ziqrbr5xJj901ZDN4TosrVaNZpEiLZAxdfnhAe7uQ7QFWfjPe9d9K2Q==",
+      "license": "MPL-2.0",
+      "engines": {
+        "node": ">= 10"
+      },
+      "optionalDependencies": {
+        "@resvg/resvg-js-android-arm-eabi": "2.6.2",
+        "@resvg/resvg-js-android-arm64": "2.6.2",
+        "@resvg/resvg-js-darwin-arm64": "2.6.2",
+        "@resvg/resvg-js-darwin-x64": "2.6.2",
+        "@resvg/resvg-js-linux-arm-gnueabihf": "2.6.2",
+        "@resvg/resvg-js-linux-arm64-gnu": "2.6.2",
+        "@resvg/resvg-js-linux-arm64-musl": "2.6.2",
+        "@resvg/resvg-js-linux-x64-gnu": "2.6.2",
+        "@resvg/resvg-js-linux-x64-musl": "2.6.2",
+        "@resvg/resvg-js-win32-arm64-msvc": "2.6.2",
+        "@resvg/resvg-js-win32-ia32-msvc": "2.6.2",
+        "@resvg/resvg-js-win32-x64-msvc": "2.6.2"
+      }
+    },
+    "node_modules/@resvg/resvg-js-android-arm-eabi": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/@resvg/resvg-js-android-arm-eabi/-/resvg-js-android-arm-eabi-2.6.2.tgz",
+      "integrity": "sha512-FrJibrAk6v29eabIPgcTUMPXiEz8ssrAk7TXxsiZzww9UTQ1Z5KAbFJs+Z0Ez+VZTYgnE5IQJqBcoSiMebtPHA==",
+      "cpu": [
+        "arm"
+      ],
+      "license": "MPL-2.0",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@resvg/resvg-js-android-arm64": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/@resvg/resvg-js-android-arm64/-/resvg-js-android-arm64-2.6.2.tgz",
+      "integrity": "sha512-VcOKezEhm2VqzXpcIJoITuvUS/fcjIw5NA/w3tjzWyzmvoCdd+QXIqy3FBGulWdClvp4g+IfUemigrkLThSjAQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "MPL-2.0",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@resvg/resvg-js-darwin-arm64": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/@resvg/resvg-js-darwin-arm64/-/resvg-js-darwin-arm64-2.6.2.tgz",
+      "integrity": "sha512-nmok2LnAd6nLUKI16aEB9ydMC6Lidiiq2m1nEBDR1LaaP7FGs4AJ90qDraxX+CWlVuRlvNjyYJTNv8qFjtL9+A==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "MPL-2.0",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@resvg/resvg-js-darwin-x64": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/@resvg/resvg-js-darwin-x64/-/resvg-js-darwin-x64-2.6.2.tgz",
+      "integrity": "sha512-GInyZLjgWDfsVT6+SHxQVRwNzV0AuA1uqGsOAW+0th56J7Nh6bHHKXHBWzUrihxMetcFDmQMAX1tZ1fZDYSRsw==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "MPL-2.0",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@resvg/resvg-js-linux-arm-gnueabihf": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/@resvg/resvg-js-linux-arm-gnueabihf/-/resvg-js-linux-arm-gnueabihf-2.6.2.tgz",
+      "integrity": "sha512-YIV3u/R9zJbpqTTNwTZM5/ocWetDKGsro0SWp70eGEM9eV2MerWyBRZnQIgzU3YBnSBQ1RcxRZvY/UxwESfZIw==",
+      "cpu": [
+        "arm"
+      ],
+      "license": "MPL-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@resvg/resvg-js-linux-arm64-gnu": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/@resvg/resvg-js-linux-arm64-gnu/-/resvg-js-linux-arm64-gnu-2.6.2.tgz",
+      "integrity": "sha512-zc2BlJSim7YR4FZDQ8OUoJg5holYzdiYMeobb9pJuGDidGL9KZUv7SbiD4E8oZogtYY42UZEap7dqkkYuA91pg==",
+      "cpu": [
+        "arm64"
+      ],
+      "libc": [
+        "glibc"
+      ],
+      "license": "MPL-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@resvg/resvg-js-linux-arm64-musl": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/@resvg/resvg-js-linux-arm64-musl/-/resvg-js-linux-arm64-musl-2.6.2.tgz",
+      "integrity": "sha512-3h3dLPWNgSsD4lQBJPb4f+kvdOSJHa5PjTYVsWHxLUzH4IFTJUAnmuWpw4KqyQ3NA5QCyhw4TWgxk3jRkQxEKg==",
+      "cpu": [
+        "arm64"
+      ],
+      "libc": [
+        "musl"
+      ],
+      "license": "MPL-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@resvg/resvg-js-linux-x64-gnu": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/@resvg/resvg-js-linux-x64-gnu/-/resvg-js-linux-x64-gnu-2.6.2.tgz",
+      "integrity": "sha512-IVUe+ckIerA7xMZ50duAZzwf1U7khQe2E0QpUxu5MBJNao5RqC0zwV/Zm965vw6D3gGFUl7j4m+oJjubBVoftw==",
+      "cpu": [
+        "x64"
+      ],
+      "libc": [
+        "glibc"
+      ],
+      "license": "MPL-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@resvg/resvg-js-linux-x64-musl": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/@resvg/resvg-js-linux-x64-musl/-/resvg-js-linux-x64-musl-2.6.2.tgz",
+      "integrity": "sha512-UOf83vqTzoYQO9SZ0fPl2ZIFtNIz/Rr/y+7X8XRX1ZnBYsQ/tTb+cj9TE+KHOdmlTFBxhYzVkP2lRByCzqi4jQ==",
+      "cpu": [
+        "x64"
+      ],
+      "libc": [
+        "musl"
+      ],
+      "license": "MPL-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@resvg/resvg-js-win32-arm64-msvc": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/@resvg/resvg-js-win32-arm64-msvc/-/resvg-js-win32-arm64-msvc-2.6.2.tgz",
+      "integrity": "sha512-7C/RSgCa+7vqZ7qAbItfiaAWhyRSoD4l4BQAbVDqRRsRgY+S+hgS3in0Rxr7IorKUpGE69X48q6/nOAuTJQxeQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "MPL-2.0",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@resvg/resvg-js-win32-ia32-msvc": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/@resvg/resvg-js-win32-ia32-msvc/-/resvg-js-win32-ia32-msvc-2.6.2.tgz",
+      "integrity": "sha512-har4aPAlvjnLcil40AC77YDIk6loMawuJwFINEM7n0pZviwMkMvjb2W5ZirsNOZY4aDbo5tLx0wNMREp5Brk+w==",
+      "cpu": [
+        "ia32"
+      ],
+      "license": "MPL-2.0",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@resvg/resvg-js-win32-x64-msvc": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/@resvg/resvg-js-win32-x64-msvc/-/resvg-js-win32-x64-msvc-2.6.2.tgz",
+      "integrity": "sha512-ZXtYhtUr5SSaBrUDq7DiyjOFJqBVL/dOBN7N/qmi/pO0IgiWW/f/ue3nbvu9joWE5aAKDoIzy/CxsY0suwGosQ==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "MPL-2.0",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
     "node_modules/@types/eslint": {
       "version": "8.21.1",
       "resolved": "https://registry.npmjs.org/@types/eslint/-/eslint-8.21.1.tgz",
@@ -293,10 +519,11 @@
       "dev": true
     },
     "node_modules/@types/vscode": {
-      "version": "1.60.0",
-      "resolved": "https://registry.npmjs.org/@types/vscode/-/vscode-1.60.0.tgz",
-      "integrity": "sha512-wZt3VTmzYrgZ0l/3QmEbCq4KAJ71K3/hmMQ/nfpv84oH8e81KKwPEoQ5v8dNCxfHFVJ1JabHKmCvqdYOoVm1Ow==",
-      "dev": true
+      "version": "1.101.0",
+      "resolved": "https://registry.npmjs.org/@types/vscode/-/vscode-1.101.0.tgz",
+      "integrity": "sha512-ZWf0IWa+NGegdW3iU42AcDTFHWW7fApLdkdnBqwYEtHVIBGbTu0ZNQKP/kX3Ds/uMJXIMQNAojHR4vexCEEz5Q==",
+      "dev": true,
+      "license": "MIT"
     },
     "node_modules/@vscode/vsce": {
       "version": "2.17.0",
@@ -2475,11 +2702,6 @@
         "node": ">= 0.8.0"
       }
     },
-    "node_modules/os-browserify": {
-      "version": "0.3.0",
-      "resolved": "https://registry.npmjs.org/os-browserify/-/os-browserify-0.3.0.tgz",
-      "integrity": "sha512-gjcpUc3clBf9+210TRaDWbf+rZZZEshZ+DlXMRCeAjp0xhTrnQsKHypIy1J3d5hKdUzj69t708EHtU8P6bUn0A=="
-    },
     "node_modules/p-limit": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
@@ -2552,11 +2774,6 @@
         "parse5": "^6.0.1"
       }
     },
-    "node_modules/path-browserify": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/path-browserify/-/path-browserify-1.0.1.tgz",
-      "integrity": "sha512-b7uo2UCUOYZcnF/3ID0lulOJi/bafxa1xPe7ZPsammBSpjSWQkjNxlt635YGS2MiR9GjvuXCtz2emr3jbsz98g=="
-    },
     "node_modules/path-exists": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-4.0.0.tgz",
@@ -2673,15 +2890,6 @@
         "once": "^1.3.1"
       }
     },
-    "node_modules/punycode": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.0.tgz",
-      "integrity": "sha512-rRV+zQD8tVFys26lAGR9WUuS4iUAngJScM+ZRSKtvl5tKeZ2t5bvdNFdNHBW9FWR4guGHlgmsZ1G7BSm2wTbuA==",
-      "dev": true,
-      "engines": {
-        "node": ">=6"
-      }
-    },
     "node_modules/qs": {
       "version": "6.11.0",
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.11.0.tgz",
@@ -3467,6 +3675,7 @@
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.9.5.tgz",
       "integrity": "sha512-1FXk9E2Hm+QzZQ7z+McJiHL4NW1F2EzMu9Nq9i3zAaGqibafqYwCVU6WyWAuyQRRzOlxou8xZSyXLEN8oKj24g==",
       "dev": true,
+      "license": "Apache-2.0",
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
@@ -3522,6 +3731,16 @@
         "punycode": "^2.1.0"
       }
     },
+    "node_modules/uri-js/node_modules/punycode": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.0.tgz",
+      "integrity": "sha512-rRV+zQD8tVFys26lAGR9WUuS4iUAngJScM+ZRSKtvl5tKeZ2t5bvdNFdNHBW9FWR4guGHlgmsZ1G7BSm2wTbuA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
diff --git a/package.json b/package.json
index 619cb076..54317f3e 100644
--- a/package.json
+++ b/package.json
@@ -4,6 +4,11 @@
   "description": "VS Code extension that allows you to record and playback guided tours of codebases, directly within the editor",
   "publisher": "vsls-contrib",
   "version": "0.0.59",
+  "packageManager": "npm@12.0.1",
+  "volta": {
+    "node": "24.18.0",
+    "npm": "12.0.1"
+  },
   "author": {
     "name": "Microsoft Corporation"
   },
@@ -18,7 +23,7 @@
   "license": "MIT",
   "icon": "images/icon.png",
   "engines": {
-    "vscode": "^1.60.0"
+    "vscode": "^1.101.0"
   },
   "categories": [
     "Other"
@@ -35,8 +40,13 @@
     "onNotebookEditor:codetour"
   ],
   "main": "./dist/extension-node.js",
-  "browser": "./dist/extension-web.js",
   "contributes": {
+    "mcpServerDefinitionProviders": [
+      {
+        "id": "codetour.tour-generator",
+        "label": "CodeTour Tour Generator"
+      }
+    ],
     "configuration": {
       "type": "object",
       "title": "CodeTour",
@@ -68,6 +78,16 @@
       }
     },
     "commands": [
+      {
+        "command": "codetour.configureCodexMcp",
+        "title": "Configure MCP for Codex",
+        "category": "CodeTour"
+      },
+      {
+        "command": "codetour.repairCodexMcp",
+        "title": "Repair MCP Configuration for Codex",
+        "category": "CodeTour"
+      },
       {
         "command": "codetour.addContentStep",
         "title": "Add Tour Step",
@@ -652,36 +672,43 @@
     ]
   },
   "dependencies": {
+    "@resvg/resvg-js": "2.6.2",
     "@types/jexl": "^2.2.0",
     "axios": "^0.21.4",
     "jexl": "^2.3.0",
     "mobx": "^5.14.2",
-    "os-browserify": "0.3.0",
-    "path-browserify": "1.0.1",
     "throttle-debounce": "^3.0.1",
     "vsls": "^1.0.2532"
   },
   "devDependencies": {
     "@types/node": "^18.14.0",
     "@types/throttle-debounce": "^5.0.0",
-    "@types/vscode": "^1.60",
+    "@types/vscode": "1.101.0",
     "@vscode/vsce": "^2.17.0",
     "debug": "^4.3.4",
     "eslint": "^8.34.0",
     "ts-loader": "^9.4.2",
-    "typescript": "^4.9.5",
+    "typescript": "4.9.5",
     "webpack": "^5.75.0",
     "webpack-cli": "^5.0.1",
     "webpack-merge": "^5.8.0"
   },
   "scripts": {
-    "build": "webpack --mode production",
+    "build:mcp": "npm --prefix packages/mcp-server run build",
+    "build:renderer": "npm --prefix packages/description-renderer run build",
+    "build": "npm run build:renderer && npm run build:mcp && webpack --mode production && npm run prepare:resvg",
+    "prepare:resvg": "node scripts/prepare-resvg-runtime.js",
+    "publish:vsix": "node scripts/publish-vsix.js",
     "vscode:prepublish": "npm run build",
     "watch": "webpack --mode development --watch",
-    "package": "vsce package"
+    "package": "node scripts/package-extension.js",
+    "test": "npm run test:plugin && npm run test:renderer && npm run test:mcp",
+    "test:plugin": "npm run build && tsc -p tsconfig.test.json && node scripts/run-compiled-tests.js dist/test",
+    "test:renderer": "npm --prefix packages/description-renderer test",
+    "test:mcp": "npm --prefix packages/mcp-server test"
   },
   "prettier": {
     "arrowParens": "avoid",
     "trailingComma": "none"
   }
-}
\ No newline at end of file
+}
diff --git a/packages/description-renderer/LICENSE.txt b/packages/description-renderer/LICENSE.txt
new file mode 100644
index 00000000..b2f52a2b
--- /dev/null
+++ b/packages/description-renderer/LICENSE.txt
@@ -0,0 +1,21 @@
+Copyright (c) Microsoft Corporation.
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/packages/description-renderer/README.md b/packages/description-renderer/README.md
new file mode 100644
index 00000000..af7f9ae3
--- /dev/null
+++ b/packages/description-renderer/README.md
@@ -0,0 +1,112 @@
+# codetour-description-renderer
+
+Offline, strict-security Mermaid rendering for [CodeTour](https://github.com/microsoft/codetour)
+Markdown descriptions. The renderer is the shared description-to-comment-content
+seam: it accepts a complete Markdown description plus the effective VS Code theme
+and returns the final Markdown used by a native VS Code comment, with each
+`mermaid` fence replaced by an in-memory PNG image or a compact warning.
+
+Design constraints:
+
+- **Offline** — no font, image, script or config fetches; rendering works with
+  network access blocked.
+- **Strict security** — Mermaid runs with `securityLevel: "strict"` and
+  `htmlLabels: false`; the intermediate SVG is additionally sanitized (scripts,
+  event handlers, `foreignObject`, anchors, remote-resource elements and all
+  external references removed) as defense in depth.
+- **In-memory transport** — Mermaid produces a theme-aware SVG internally, which
+  is rasterized to PNG with `@resvg/resvg-js` and emitted as a
+  `data:image/png;base64` image; SVG data URIs did not display as images in
+  native comments. No generated SVG or PNG file is ever written.
+- **No generated assets** — the Mermaid source stays in the tour file; nothing
+  is committed or persisted.
+- **Reuse** — rendered diagrams are reused only in memory when their exact
+  source, effective theme, renderer version and rendering options match. A
+  theme change can call `clearMermaidRenderCache()` to discard all entries;
+  failures are never kept in the cache. The MCP server (`packages/mcp-server`)
+  will validate Mermaid with the same exact, locked Mermaid version and diagram
+  rules through this package.
+
+## Diagram rules
+
+The rules below are implemented in `src/rules.ts` and are the single source of
+truth shared by playback and (later) MCP validation. They are deliberately
+syntactic and dependency-free so both sides evaluate them identically.
+
+- **Fence**: a Mermaid fence is a block whose opening line matches
+  `^\s*```mermaid[ \t]*$` and whose closing line is the next line that is only
+  backticks (`^\s*```[ \t]*$`). A `mermaid` line nested inside another fence is
+  not a Mermaid fence.
+- **Caption**: the nearest non-blank line above the fence's opening line must
+  be a caption: `^\s*\*\*(Diagram — …)\*\*[ \t]*$`, where `…` is one or more
+  characters that do not contain `**`. Blank lines may sit between the caption
+  and the fence; any other content breaks the association. The caption stays
+  visible and becomes the image alternative text.
+- **Allowlist**: the diagram kind is the first whitespace-delimited token of
+  the first significant source line (blank lines and `%%` comment/init-directive
+  lines are skipped). Exactly `flowchart`, `sequenceDiagram`,
+  `stateDiagram-v2`, `classDiagram` and `erDiagram` are supported; aliases such
+  as `graph` or `stateDiagram` are not.
+- **Count limit**: at most 3 Mermaid fences per description, counted in
+  document order. During playback the first three fences are evaluated and each
+  fence from the fourth on fails locally with a warning, regardless of its
+  content. Validation (MCP) rejects the whole description when it contains more
+  than 3 fences.
+- **Size limit**: the UTF-8 byte length of the source (the exact text between
+  the opening and closing fence lines) must be at most 20 KB (20480 bytes).
+- **Per-fence evaluation order**: caption, then size, then kind. The first
+  violated rule decides the failure. Diagrams in one description are evaluated
+  and rendered independently, so one rejected diagram never hides its siblings.
+- **Failures**: a rejected or unrenderable diagram is replaced by a single
+  compact warning line and never by its source. `renderMermaidDiagram` also
+  refuses unsupported kinds on its own, so the low-level API is safe to call
+  directly.
+
+## API
+
+```ts
+type DescriptionTheme = "light" | "dark";
+
+renderDescription(description: string, theme: DescriptionTheme): Promise<string>;
+renderMermaidDiagram(source: string, theme: DescriptionTheme): Promise<{ svg: string; png: Buffer }>;
+clearMermaidRenderCache(): void;
+invalidateMermaidRenderCache(): void; // alias used by theme-change callers
+sanitizeSvg(svg: string): string;
+```
+
+`renderDescription` is the shared Markdown transformation used by playback
+surfaces. Its diagram work is backed by the in-memory cache; no cache entry or
+generated image is written to the workspace or persisted in VS Code state.
+`DESCRIPTION_RENDERER_VERSION` identifies the output contract represented by
+the cache.
+
+Shared rule surface (for playback and MCP validation):
+
+```ts
+ALLOWED_DIAGRAM_KINDS: readonly ["flowchart", "sequenceDiagram", "stateDiagram-v2", "classDiagram", "erDiagram"];
+MAX_DIAGRAMS_PER_DESCRIPTION: 3;
+MAX_DIAGRAM_SOURCE_BYTES: 20480;
+
+findDiagramFences(description: string): DiagramFence[]; // caption?, source, start, end
+matchDiagramCaption(line: string): string | undefined;
+diagramKindOf(source: string): string | undefined;
+diagramSourceByteLength(source: string): number;
+isAllowedDiagramKind(kind: string): boolean;
+isMermaidFenceInfo(info: string): boolean;
+evaluateDiagramFence(fence: { caption?: string; source: string }): DiagramFenceEvaluation;
+```
+
+## Development
+
+From the repository root:
+
+```bash
+npm ci --prefix packages/description-renderer
+npm test --prefix packages/description-renderer
+```
+
+Dependencies are exact-pinned (`mermaid` 11.12.2, `jsdom` 26.1.0,
+`@resvg/resvg-js` 2.6.2) so every consumer renders with the same locked
+versions. JSDOM has no real SVG layout: text measurement relies on bounded
+heuristics (`getBBox`, `getComputedTextLength`, `getBoundingClientRect`
+polyfills), validated against all five allowed diagram kinds.
diff --git a/packages/description-renderer/package-lock.json b/packages/description-renderer/package-lock.json
new file mode 100644
index 00000000..6807af07
--- /dev/null
+++ b/packages/description-renderer/package-lock.json
@@ -0,0 +1,1990 @@
+{
+  "name": "codetour-description-renderer",
+  "version": "0.1.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "codetour-description-renderer",
+      "version": "0.1.0",
+      "license": "MIT",
+      "dependencies": {
+        "@resvg/resvg-js": "2.6.2",
+        "jsdom": "26.1.0",
+        "mermaid": "11.12.2"
+      },
+      "devDependencies": {
+        "@types/jsdom": "27.0.0",
+        "@types/node": "24.13.3",
+        "typescript": "5.9.3"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@antfu/install-pkg": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@antfu/install-pkg/-/install-pkg-1.1.0.tgz",
+      "integrity": "sha512-MGQsmw10ZyI+EJo45CdSER4zEb+p31LpDAFp2Z3gkSd1yqVZGi0Ebx++YTEMonJy4oChEMLsxZ64j8FH6sSqtQ==",
+      "license": "MIT",
+      "dependencies": {
+        "package-manager-detector": "^1.3.0",
+        "tinyexec": "^1.0.1"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
+      }
+    },
+    "node_modules/@asamuzakjp/css-color": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-3.2.0.tgz",
+      "integrity": "sha512-K1A6z8tS3XsmCMM86xoWdn7Fkdn9m6RSVtocUrJYIwZnFVkng/PvkEoWtOWmP+Scc6saYWHWZYbndEEXxl24jw==",
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/css-calc": "^2.1.3",
+        "@csstools/css-color-parser": "^3.0.9",
+        "@csstools/css-parser-algorithms": "^3.0.4",
+        "@csstools/css-tokenizer": "^3.0.3",
+        "lru-cache": "^10.4.3"
+      }
+    },
+    "node_modules/@braintree/sanitize-url": {
+      "version": "7.1.2",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
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+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist/esm/bin/uuid"
+      }
+    },
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+      "license": "MIT",
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+        "node": ">=14.0.0"
+      }
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+      "license": "MIT",
+      "dependencies": {
+        "vscode-languageserver-protocol": "3.17.5"
+      },
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+        "installServerIntoExtension": "bin/installServerIntoExtension"
+      }
+    },
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+      "version": "3.17.5",
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+        "vscode-jsonrpc": "8.2.0",
+        "vscode-languageserver-types": "3.17.5"
+      }
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+      "license": "MIT"
+    },
+    "node_modules/vscode-languageserver-types": {
+      "version": "3.17.5",
+      "resolved": "https://registry.npmjs.org/vscode-languageserver-types/-/vscode-languageserver-types-3.17.5.tgz",
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+      "license": "MIT"
+    },
+    "node_modules/vscode-uri": {
+      "version": "3.0.8",
+      "resolved": "https://registry.npmjs.org/vscode-uri/-/vscode-uri-3.0.8.tgz",
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+      "license": "MIT"
+    },
+    "node_modules/w3c-xmlserializer": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-5.0.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "xml-name-validator": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/webidl-conversions": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-7.0.0.tgz",
+      "integrity": "sha512-VwddBukDzu71offAQR975unBIGqfKZpM+8ZX6ySk8nYhVoo5CYaZyzt3YBvYtRtO+aoGlqxPg/B87NGVZ/fu6g==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/whatwg-encoding": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-3.1.1.tgz",
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+      "deprecated": "Use @exodus/bytes instead for a more spec-conformant and faster implementation",
+      "license": "MIT",
+      "dependencies": {
+        "iconv-lite": "0.6.3"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/whatwg-mimetype": {
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+      "integrity": "sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/whatwg-url": {
+      "version": "14.2.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-14.2.0.tgz",
+      "integrity": "sha512-De72GdQZzNTUBBChsXueQUnPKDkg/5A5zp7pFDuQAj5UFoENpiACU0wlCvzpAGnTkj++ihpKwKyYewn/XNUbKw==",
+      "license": "MIT",
+      "dependencies": {
+        "tr46": "^5.1.0",
+        "webidl-conversions": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/ws": {
+      "version": "8.21.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.21.3.tgz",
+      "integrity": "sha512-201TZ/kPWxoPr/OKWjquZR1SWKXcvxdH+e1xrx89b3YbmzLMFCLfnaG1HFIgWzJOEWZ7MvpK++odZufgYR50Rw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/xml-name-validator": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
+      "integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "license": "MIT"
+    }
+  }
+}
diff --git a/packages/description-renderer/package.json b/packages/description-renderer/package.json
new file mode 100644
index 00000000..e6955d14
--- /dev/null
+++ b/packages/description-renderer/package.json
@@ -0,0 +1,39 @@
+{
+  "name": "codetour-description-renderer",
+  "version": "0.1.0",
+  "description": "Offline, strict-security Mermaid rendering that turns CodeTour Markdown descriptions into native comment content",
+  "license": "MIT",
+  "author": {
+    "name": "Microsoft Corporation"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/microsoft/codetour",
+    "directory": "packages/description-renderer"
+  },
+  "main": "dist/src/index.js",
+  "types": "dist/src/index.d.ts",
+  "files": [
+    "dist/src",
+    "README.md",
+    "LICENSE.txt"
+  ],
+  "engines": {
+    "node": ">=18"
+  },
+  "scripts": {
+    "build": "tsc -p tsconfig.json",
+    "typecheck": "tsc -p tsconfig.json --noEmit",
+    "test": "npm run build && node ../../scripts/run-compiled-tests.js dist/test"
+  },
+  "dependencies": {
+    "@resvg/resvg-js": "2.6.2",
+    "jsdom": "26.1.0",
+    "mermaid": "11.12.2"
+  },
+  "devDependencies": {
+    "@types/jsdom": "27.0.0",
+    "@types/node": "24.13.3",
+    "typescript": "5.9.3"
+  }
+}
diff --git a/packages/description-renderer/src/description.ts b/packages/description-renderer/src/description.ts
new file mode 100644
index 00000000..2ec82f59
--- /dev/null
+++ b/packages/description-renderer/src/description.ts
@@ -0,0 +1,66 @@
+import { findDiagramFences } from "./parse";
+import {
+  DescriptionTheme,
+  renderMermaidDiagram
+} from "./render";
+import {
+  DiagramRuleReason,
+  MAX_DIAGRAMS_PER_DESCRIPTION,
+  evaluateDiagramFence
+} from "./rules";
+
+const RENDER_FAILURE_NOTICES: Record<DiagramRuleReason | "render" | "count", string> = {
+  caption:
+    "> ⚠️ The Mermaid diagram requires an immediately preceding **Diagram — …** caption.",
+  size: "> ⚠️ The Mermaid diagram source exceeds the 20 KB limit.",
+  kind:
+    "> ⚠️ Unsupported Mermaid diagram kind (supported: flowchart, sequenceDiagram, stateDiagram-v2, classDiagram, erDiagram).",
+  count:
+    "> ⚠️ A description accepts at most three Mermaid diagrams; this one was not rendered.",
+  render: "> ⚠️ The Mermaid diagram could not be rendered."
+};
+
+function escapeAltText(caption: string): string {
+  return caption.replace(/([[\]])/g, "\\$1");
+}
+
+export async function renderDescription(
+  description: string,
+  theme: DescriptionTheme
+): Promise<string> {
+  const fences = findDiagramFences(description);
+  if (fences.length === 0) {
+    return description;
+  }
+
+  let content = description;
+  for (let index = fences.length - 1; index >= 0; index--) {
+    const fence = fences[index];
+    let replacement: string;
+
+    if (index >= MAX_DIAGRAMS_PER_DESCRIPTION) {
+      replacement = RENDER_FAILURE_NOTICES.count;
+    } else if (!fence.closed) {
+      replacement = RENDER_FAILURE_NOTICES.render;
+    } else {
+      const evaluation = evaluateDiagramFence(fence);
+      if (!evaluation.allowed) {
+        replacement = RENDER_FAILURE_NOTICES[evaluation.reason];
+      } else {
+        try {
+          const { png } = await renderMermaidDiagram(fence.source, theme);
+          replacement = `![${escapeAltText(
+            fence.caption!
+          )}](data:image/png;base64,${png.toString("base64")})`;
+        } catch {
+          replacement = RENDER_FAILURE_NOTICES.render;
+        }
+      }
+    }
+
+    content =
+      content.slice(0, fence.start) + replacement + content.slice(fence.end);
+  }
+
+  return content;
+}
diff --git a/packages/description-renderer/src/dom.ts b/packages/description-renderer/src/dom.ts
new file mode 100644
index 00000000..20cd866b
--- /dev/null
+++ b/packages/description-renderer/src/dom.ts
@@ -0,0 +1,518 @@
+import { JSDOM } from "jsdom";
+import {
+  DEFAULT_FONT_SIZE,
+  LINE_HEIGHT_FACTOR,
+  measureTextWidth
+} from "./measure";
+
+const SVG_NAMESPACE = "http://www.w3.org/2000/svg";
+
+const DOM_GLOBAL_KEYS = [
+  "window",
+  "self",
+  "document",
+  "navigator",
+  "location",
+  "history",
+  "getComputedStyle",
+  "DOMParser",
+  "XMLSerializer",
+  "Node",
+  "Element",
+  "HTMLElement",
+  "HTMLAnchorElement",
+  "HTMLImageElement",
+  "Image",
+  "SVGElement",
+  "MutationObserver",
+  "CSSStyleDeclaration"
+];
+
+const NON_RENDERED_ELEMENTS = new Set([
+  "defs",
+  "style",
+  "title",
+  "desc",
+  "metadata",
+  "clipPath",
+  "mask",
+  "pattern",
+  "symbol",
+  "marker",
+  "linearGradient",
+  "radialGradient",
+  "filter",
+  "script"
+]);
+
+interface Box {
+  x: number;
+  y: number;
+  width: number;
+  height: number;
+}
+
+interface Matrix {
+  a: number;
+  b: number;
+  c: number;
+  d: number;
+  e: number;
+  f: number;
+}
+
+const IDENTITY: Matrix = { a: 1, b: 0, c: 0, d: 1, e: 0, f: 0 };
+
+let environment: { window: DomWindow } | undefined;
+
+export interface DomWindow {
+  document: Document;
+  DOMParser: typeof DOMParser;
+  XMLSerializer: typeof XMLSerializer;
+  SVGElement: typeof SVGElement;
+  close(): void;
+}
+
+export function ensureDomEnvironment(): DomWindow {
+  if (environment) {
+    return environment.window;
+  }
+
+  const dom = new JSDOM("<!DOCTYPE html><html><head></head><body></body></html>", {
+    pretendToBeVisual: false,
+    url: "https://codetour.invalid/"
+  });
+
+  installSvgMeasurement(dom.window);
+
+  environment = dom;
+
+  const globals = globalThis as unknown as Record<string, unknown>;
+  const domGlobals = dom.window as unknown as Record<string, unknown>;
+  for (const key of DOM_GLOBAL_KEYS) {
+    if (domGlobals[key] === undefined) {
+      continue;
+    }
+    Object.defineProperty(globals, key, {
+      value: domGlobals[key],
+      configurable: true,
+      writable: true,
+      enumerable: true
+    });
+  }
+
+  return dom.window;
+}
+
+function installSvgMeasurement(window: DomWindow) {
+  const prototype = window.SVGElement && window.SVGElement.prototype;
+  if (!prototype) {
+    return;
+  }
+
+  const svgPrototype = prototype as unknown as Record<string, unknown>;
+
+  if (typeof svgPrototype.getBBox !== "function") {
+    svgPrototype.getBBox = function(this: Element): Box {
+      return measureElementBox(this);
+    };
+  }
+
+  if (typeof svgPrototype.getComputedTextLength !== "function") {
+    svgPrototype.getComputedTextLength = function(this: Element): number {
+      return measureTextWidth(this.textContent || "", fontSizeOf(this));
+    };
+  }
+
+  svgPrototype.getBoundingClientRect = function(this: Element) {
+    const box = measureTextBox(this);
+    return {
+      x: box.x,
+      y: box.y,
+      width: box.width,
+      height: box.height,
+      top: box.y,
+      left: box.x,
+      right: box.x + box.width,
+      bottom: box.y + box.height,
+      toJSON() {
+        return box;
+      }
+    };
+  };
+}
+
+function coordinateOf(value: string | null, fontSize: number): number | undefined {
+  if (value === null) {
+    return undefined;
+  }
+  const parsed = parseFloat(value);
+  if (isNaN(parsed)) {
+    return undefined;
+  }
+  if (value.trim().endsWith("em")) {
+    return parsed * fontSize;
+  }
+  return parsed;
+}
+
+function fontSizeOf(element: Element): number {
+  let current: Element | null = element;
+  while (current) {
+    const attribute = coordinateOf(current.getAttribute("font-size"), DEFAULT_FONT_SIZE);
+    if (attribute !== undefined) {
+      return attribute;
+    }
+    const style = current.getAttribute("style");
+    if (style) {
+      const match = style.match(/font-size:\s*([\d.]+)(px|em)?/);
+      if (match) {
+        const size = parseFloat(match[1]);
+        return match[2] === "em" ? size * DEFAULT_FONT_SIZE : size;
+      }
+    }
+    current = current.parentElement;
+  }
+  return DEFAULT_FONT_SIZE;
+}
+
+function measureTextBox(element: Element): Box {
+  const fontSize = fontSizeOf(element);
+  const x = coordinateOf(element.getAttribute("x"), fontSize) || 0;
+  const tspans = Array.from(element.children).filter(
+    child => child.localName === "tspan"
+  );
+
+  let width = 0;
+  let top = Infinity;
+  let bottom = -Infinity;
+
+  const measureLine = (text: string, y: number) => {
+    width = Math.max(width, measureTextWidth(text, fontSize));
+    top = Math.min(top, y - fontSize * 0.85);
+    bottom = Math.max(bottom, y + fontSize * 0.3);
+  };
+
+  if (tspans.length > 0) {
+    let lineY = coordinateOf(element.getAttribute("y"), fontSize) || 0;
+    for (const tspan of tspans) {
+      const explicitY = coordinateOf(tspan.getAttribute("y"), fontSize);
+      const dy = coordinateOf(tspan.getAttribute("dy"), fontSize);
+      if (explicitY !== undefined) {
+        lineY = explicitY;
+      } else if (dy !== undefined) {
+        lineY += dy;
+      } else {
+        lineY += fontSize * LINE_HEIGHT_FACTOR;
+      }
+      measureLine(tspan.textContent || "", lineY);
+    }
+  } else {
+    measureLine(
+      element.textContent || "",
+      coordinateOf(element.getAttribute("y"), fontSize) || 0
+    );
+  }
+
+  if (top === Infinity) {
+    top = -fontSize;
+    bottom = fontSize * 0.3;
+  }
+
+  return {
+    x,
+    y: top,
+    width,
+    height: Math.max(bottom - top, fontSize * LINE_HEIGHT_FACTOR)
+  };
+}
+
+function union(boxes: Box[]): Box {
+  const minX = Math.min(...boxes.map(box => box.x));
+  const minY = Math.min(...boxes.map(box => box.y));
+  const maxX = Math.max(...boxes.map(box => box.x + box.width));
+  const maxY = Math.max(...boxes.map(box => box.y + box.height));
+  return { x: minX, y: minY, width: maxX - minX, height: maxY - minY };
+}
+
+function multiplyMatrices(first: Matrix, second: Matrix): Matrix {
+  return {
+    a: first.a * second.a + first.c * second.b,
+    b: first.b * second.a + first.d * second.b,
+    c: first.a * second.c + first.c * second.d,
+    d: first.b * second.c + first.d * second.d,
+    e: first.a * second.e + first.c * second.f + first.e,
+    f: first.b * second.e + first.d * second.f + first.f
+  };
+}
+
+function parseTransform(value: string | null): Matrix {
+  if (!value) {
+    return IDENTITY;
+  }
+
+  let result = IDENTITY;
+  const pattern = /(translate|scale|rotate|matrix)\s*\(([^)]*)\)/g;
+  let match: RegExpExecArray | null;
+  while ((match = pattern.exec(value))) {
+    const args = match[2]
+      .split(/[\s,]+/)
+      .map(Number)
+      .filter(number => !isNaN(number));
+
+    let transform: Matrix;
+    if (match[1] === "translate") {
+      transform = { a: 1, b: 0, c: 0, d: 1, e: args[0] || 0, f: args[1] || 0 };
+    } else if (match[1] === "scale") {
+      const scaleX = args[0] === undefined ? 1 : args[0];
+      const scaleY = args[1] === undefined ? scaleX : args[1];
+      transform = { a: scaleX, b: 0, c: 0, d: scaleY, e: 0, f: 0 };
+    } else if (match[1] === "rotate") {
+      const angle = ((args[0] || 0) * Math.PI) / 180;
+      const cos = Math.cos(angle);
+      const sin = Math.sin(angle);
+      const rotation = { a: cos, b: sin, c: -sin, d: cos, e: 0, f: 0 };
+      if (args.length > 2) {
+        transform = multiplyMatrices(
+          multiplyMatrices({ a: 1, b: 0, c: 0, d: 1, e: args[1], f: args[2] }, rotation),
+          { a: 1, b: 0, c: 0, d: 1, e: -args[1], f: -args[2] }
+        );
+      } else {
+        transform = rotation;
+      }
+    } else {
+      transform = {
+        a: args[0] || 1,
+        b: args[1] || 0,
+        c: args[2] || 0,
+        d: args[3] || 1,
+        e: args[4] || 0,
+        f: args[5] || 0
+      };
+    }
+
+    result = multiplyMatrices(result, transform);
+  }
+
+  return result;
+}
+
+function transformBox(box: Box, matrix: Matrix): Box {
+  const points = [
+    { x: box.x, y: box.y },
+    { x: box.x + box.width, y: box.y },
+    { x: box.x, y: box.y + box.height },
+    { x: box.x + box.width, y: box.y + box.height }
+  ].map(point => ({
+    x: matrix.a * point.x + matrix.c * point.y + matrix.e,
+    y: matrix.b * point.x + matrix.d * point.y + matrix.f
+  }));
+
+  return union(points.map(point => ({ ...point, width: 0, height: 0 })));
+}
+
+function measureElementBox(element: Element, inherited: Matrix = IDENTITY): Box {
+  const matrix = multiplyMatrices(
+    inherited,
+    parseTransform(element.getAttribute("transform"))
+  );
+
+  const tag = element.localName;
+
+  if (tag === "text" || tag === "tspan") {
+    return transformBox(measureTextBox(element), matrix);
+  }
+
+  if (tag === "rect") {
+    return transformBox(
+      {
+        x: coordinateOf(element.getAttribute("x"), DEFAULT_FONT_SIZE) || 0,
+        y: coordinateOf(element.getAttribute("y"), DEFAULT_FONT_SIZE) || 0,
+        width: coordinateOf(element.getAttribute("width"), DEFAULT_FONT_SIZE) || 0,
+        height: coordinateOf(element.getAttribute("height"), DEFAULT_FONT_SIZE) || 0
+      },
+      matrix
+    );
+  }
+
+  if (tag === "circle") {
+    const r = coordinateOf(element.getAttribute("r"), DEFAULT_FONT_SIZE) || 0;
+    const cx = coordinateOf(element.getAttribute("cx"), DEFAULT_FONT_SIZE) || 0;
+    const cy = coordinateOf(element.getAttribute("cy"), DEFAULT_FONT_SIZE) || 0;
+    return transformBox({ x: cx - r, y: cy - r, width: r * 2, height: r * 2 }, matrix);
+  }
+
+  if (tag === "ellipse") {
+    const rx = coordinateOf(element.getAttribute("rx"), DEFAULT_FONT_SIZE) || 0;
+    const ry = coordinateOf(element.getAttribute("ry"), DEFAULT_FONT_SIZE) || 0;
+    const cx = coordinateOf(element.getAttribute("cx"), DEFAULT_FONT_SIZE) || 0;
+    const cy = coordinateOf(element.getAttribute("cy"), DEFAULT_FONT_SIZE) || 0;
+    return transformBox({ x: cx - rx, y: cy - ry, width: rx * 2, height: ry * 2 }, matrix);
+  }
+
+  if (tag === "line") {
+    const x1 = coordinateOf(element.getAttribute("x1"), DEFAULT_FONT_SIZE) || 0;
+    const y1 = coordinateOf(element.getAttribute("y1"), DEFAULT_FONT_SIZE) || 0;
+    const x2 = coordinateOf(element.getAttribute("x2"), DEFAULT_FONT_SIZE) || 0;
+    const y2 = coordinateOf(element.getAttribute("y2"), DEFAULT_FONT_SIZE) || 0;
+    return transformBox(
+      union([
+        { x: x1, y: y1, width: 0, height: 0 },
+        { x: x2, y: y2, width: 0, height: 0 }
+      ]),
+      matrix
+    );
+  }
+
+  if (tag === "path") {
+    return pathBox(element, matrix);
+  }
+
+  const boxes = Array.from(element.children)
+    .filter(child => !NON_RENDERED_ELEMENTS.has(child.localName))
+    .map(child => measureElementBox(child, matrix));
+  if (boxes.length === 0) {
+    return transformBox({ x: 0, y: 0, width: 0, height: 0 }, matrix);
+  }
+  return union(boxes);
+}
+
+function pathBox(element: Element, matrix: Matrix): Box {
+  const commands = element.getAttribute("d") || "";
+  const pattern = /([MLCQTAZmlcqtaz])([^MLCQTAZmlcqtaz]*)/g;
+  let currentX = 0;
+  let currentY = 0;
+  let minX = Infinity;
+  let minY = Infinity;
+  let maxX = -Infinity;
+  let maxY = -Infinity;
+
+  const track = (x: number, y: number) => {
+    minX = Math.min(minX, x);
+    minY = Math.min(minY, y);
+    maxX = Math.max(maxX, x);
+    maxY = Math.max(maxY, y);
+  };
+
+  let match: RegExpExecArray | null;
+  while ((match = pattern.exec(commands))) {
+    const command = match[1];
+    const args = match[2]
+      .trim()
+      .split(/[\s,]+/)
+      .filter(part => part !== "")
+      .map(Number)
+      .filter(number => !isNaN(number));
+
+    if (command === "M" || command === "L" || command === "T") {
+      for (let index = 0; index + 1 < args.length; index += 2) {
+        currentX = args[index];
+        currentY = args[index + 1];
+        track(currentX, currentY);
+      }
+    } else if (command === "m" || command === "l" || command === "t") {
+      for (let index = 0; index + 1 < args.length; index += 2) {
+        currentX += args[index];
+        currentY += args[index + 1];
+        track(currentX, currentY);
+      }
+    } else if (command === "C") {
+      for (let index = 0; index + 5 < args.length; index += 6) {
+        track(args[index], args[index + 1]);
+        track(args[index + 2], args[index + 3]);
+        currentX = args[index + 4];
+        currentY = args[index + 5];
+        track(currentX, currentY);
+      }
+    } else if (command === "c") {
+      for (let index = 0; index + 5 < args.length; index += 6) {
+        track(currentX + args[index], currentY + args[index + 1]);
+        track(currentX + args[index + 2], currentY + args[index + 3]);
+        currentX += args[index + 4];
+        currentY += args[index + 5];
+        track(currentX, currentY);
+      }
+    } else if (command === "Q" || command === "S") {
+      for (let index = 0; index + 3 < args.length; index += 4) {
+        track(args[index], args[index + 1]);
+        currentX = args[index + 2];
+        currentY = args[index + 3];
+        track(currentX, currentY);
+      }
+    } else if (command === "q" || command === "s") {
+      for (let index = 0; index + 3 < args.length; index += 4) {
+        track(currentX + args[index], currentY + args[index + 1]);
+        currentX += args[index + 2];
+        currentY += args[index + 3];
+        track(currentX, currentY);
+      }
+    } else if (command === "H") {
+      for (const value of args) {
+        currentX = value;
+        track(currentX, currentY);
+      }
+    } else if (command === "h") {
+      for (const value of args) {
+        currentX += value;
+        track(currentX, currentY);
+      }
+    } else if (command === "V") {
+      for (const value of args) {
+        currentY = value;
+        track(currentX, currentY);
+      }
+    } else if (command === "v") {
+      for (const value of args) {
+        currentY += value;
+        track(currentX, currentY);
+      }
+    } else if (command === "A") {
+      for (let index = 5; index < args.length; index += 7) {
+        currentX = args[index];
+        currentY = args[index + 1];
+        track(currentX, currentY);
+      }
+    } else if (command === "a") {
+      for (let index = 5; index < args.length; index += 7) {
+        currentX += args[index];
+        currentY += args[index + 1];
+        track(currentX, currentY);
+      }
+    }
+  }
+
+  if (minX === Infinity) {
+    return transformBox({ x: 0, y: 0, width: 0, height: 0 }, matrix);
+  }
+
+  return transformBox(
+    { x: minX, y: minY, width: maxX - minX, height: maxY - minY },
+    matrix
+  );
+}
+
+export function measureContentBounds(root: Element): Box {
+  const boxes = Array.from(root.children)
+    .filter(child => !NON_RENDERED_ELEMENTS.has(child.localName))
+    .map(child => measureElementBox(child));
+  if (boxes.length === 0) {
+    return { x: 0, y: 0, width: 0, height: 0 };
+  }
+  return union(boxes);
+}
+
+export function parseSvgDocument(svg: string): Document {
+  const window = ensureDomEnvironment();
+  const document = new window.DOMParser().parseFromString(svg, "image/svg+xml");
+  if (document.documentElement.localName !== "svg") {
+    throw new Error("The rendered diagram is not a valid SVG document");
+  }
+  return document;
+}
+
+export function serializeSvgDocument(document: Document): string {
+  const window = ensureDomEnvironment();
+  return new window.XMLSerializer().serializeToString(document.documentElement);
+}
+
+export { SVG_NAMESPACE };
diff --git a/packages/description-renderer/src/index.ts b/packages/description-renderer/src/index.ts
new file mode 100644
index 00000000..a12beaee
--- /dev/null
+++ b/packages/description-renderer/src/index.ts
@@ -0,0 +1,28 @@
+export { renderDescription } from "./description";
+export {
+  clearMermaidRenderCache,
+  DESCRIPTION_RENDERER_VERSION,
+  invalidateMermaidRenderCache,
+  renderMermaidDiagram
+} from "./render";
+export type { DescriptionTheme, RenderedDiagram } from "./render";
+export { sanitizeSvg } from "./sanitize";
+export { findDiagramFences } from "./parse";
+export type { DiagramFence } from "./parse";
+export {
+  ALLOWED_DIAGRAM_KINDS,
+  MAX_DIAGRAMS_PER_DESCRIPTION,
+  MAX_DIAGRAM_SOURCE_BYTES,
+  diagramKindOf,
+  diagramSourceByteLength,
+  evaluateDiagramFence,
+  isAllowedDiagramKind,
+  isMermaidFenceInfo,
+  matchDiagramCaption
+} from "./rules";
+export type {
+  AllowedDiagramKind,
+  DiagramFenceEvaluation,
+  DiagramFenceInput,
+  DiagramRuleReason
+} from "./rules";
diff --git a/packages/description-renderer/src/measure.ts b/packages/description-renderer/src/measure.ts
new file mode 100644
index 00000000..3174fa97
--- /dev/null
+++ b/packages/description-renderer/src/measure.ts
@@ -0,0 +1,66 @@
+const NARROW_CHARACTERS = new Set([
+  "i",
+  "I",
+  "l",
+  "j",
+  "t",
+  "f",
+  ".",
+  ",",
+  ":",
+  ";",
+  "'",
+  "`",
+  "|",
+  "!",
+  "(",
+  ")",
+  "[",
+  "]",
+  "{",
+  "}",
+  "/",
+  "\\",
+  "-"
+]);
+
+const WIDE_CHARACTERS = new Set(["m", "M", "w", "W", "@", "%", "&"]);
+
+export const DEFAULT_FONT_SIZE = 16;
+export const LINE_HEIGHT_FACTOR = 1.25;
+
+function characterWidthFactor(character: string): number {
+  if (character === " ") {
+    return 0.3;
+  }
+  if (character === "\t") {
+    return 1.2;
+  }
+  if (NARROW_CHARACTERS.has(character)) {
+    return 0.32;
+  }
+  if (WIDE_CHARACTERS.has(character)) {
+    return 0.95;
+  }
+  if (character >= "A" && character <= "Z") {
+    return 0.72;
+  }
+  if (character >= "0" && character <= "9") {
+    return 0.58;
+  }
+  if (character === "—" || character === "–") {
+    return 1;
+  }
+  if (character.charCodeAt(0) > 0x2000) {
+    return 1;
+  }
+  return 0.55;
+}
+
+export function measureTextWidth(text: string, fontSize: number): number {
+  let width = 0;
+  for (const character of text) {
+    width += characterWidthFactor(character);
+  }
+  return width * fontSize;
+}
diff --git a/packages/description-renderer/src/parse.ts b/packages/description-renderer/src/parse.ts
new file mode 100644
index 00000000..ce613641
--- /dev/null
+++ b/packages/description-renderer/src/parse.ts
@@ -0,0 +1,81 @@
+import { isMermaidFenceInfo, matchDiagramCaption } from "./rules";
+
+const FENCE_INFO_PATTERN = /^\s*```(.*)$/;
+const FENCE_CLOSE_PATTERN = /^\s*```[ \t]*$/;
+const FENCE_OPEN_PATTERN = /^\s*```/;
+
+export interface DiagramFence {
+  caption?: string;
+  source: string;
+  closed: boolean;
+  start: number;
+  end: number;
+}
+
+function findCaption(lines: string[], fenceIndex: number): string | undefined {
+  for (let index = fenceIndex - 1; index >= 0; index--) {
+    const line = lines[index];
+    if (line.trim() === "") {
+      continue;
+    }
+    return matchDiagramCaption(line);
+  }
+  return undefined;
+}
+
+export function findDiagramFences(description: string): DiagramFence[] {
+  const lines = description.split("\n");
+  const lineOffsets: number[] = [];
+  let offset = 0;
+  for (const line of lines) {
+    lineOffsets.push(offset);
+    offset += line.length + 1;
+  }
+
+  const fences: DiagramFence[] = [];
+
+  let index = 0;
+  while (index < lines.length) {
+    if (!FENCE_OPEN_PATTERN.test(lines[index])) {
+      index++;
+      continue;
+    }
+
+    let closeIndex = -1;
+    for (let candidate = index + 1; candidate < lines.length; candidate++) {
+      if (FENCE_CLOSE_PATTERN.test(lines[candidate])) {
+        closeIndex = candidate;
+        break;
+      }
+    }
+
+    if (closeIndex === -1) {
+      const infoMatch = lines[index].match(FENCE_INFO_PATTERN);
+      if (infoMatch && isMermaidFenceInfo(infoMatch[1])) {
+        fences.push({
+          caption: findCaption(lines, index),
+          source: lines.slice(index + 1).join("\n"),
+          closed: false,
+          start: lineOffsets[index],
+          end: description.length
+        });
+      }
+      break;
+    }
+
+    const infoMatch = lines[index].match(FENCE_INFO_PATTERN);
+    if (infoMatch && isMermaidFenceInfo(infoMatch[1])) {
+      fences.push({
+        caption: findCaption(lines, index),
+        source: lines.slice(index + 1, closeIndex).join("\n"),
+        closed: true,
+        start: lineOffsets[index],
+        end: lineOffsets[closeIndex] + lines[closeIndex].length
+      });
+    }
+
+    index = closeIndex + 1;
+  }
+
+  return fences;
+}
diff --git a/packages/description-renderer/src/rasterize.ts b/packages/description-renderer/src/rasterize.ts
new file mode 100644
index 00000000..a5b0a7f4
--- /dev/null
+++ b/packages/description-renderer/src/rasterize.ts
@@ -0,0 +1,21 @@
+import { Resvg } from "@resvg/resvg-js";
+
+const MAX_RASTERIZED_WIDTH = 2000;
+
+export function rasterizeSvg(
+  svg: string,
+  naturalWidth: number,
+  maxRasterizedWidth: number = MAX_RASTERIZED_WIDTH
+): Buffer {
+  const resvg = new Resvg(svg, {
+    font: {
+      loadSystemFonts: true
+    },
+    fitTo:
+      naturalWidth > maxRasterizedWidth
+        ? { mode: "width", value: maxRasterizedWidth }
+        : { mode: "original" }
+  });
+
+  return resvg.render().asPng();
+}
diff --git a/packages/description-renderer/src/render.ts b/packages/description-renderer/src/render.ts
new file mode 100644
index 00000000..b9b89616
--- /dev/null
+++ b/packages/description-renderer/src/render.ts
@@ -0,0 +1,218 @@
+import { ensureDomEnvironment, measureContentBounds } from "./dom";
+import { rasterizeSvg } from "./rasterize";
+import { sanitizeSvg } from "./sanitize";
+import { diagramKindOf, isAllowedDiagramKind } from "./rules";
+
+export type DescriptionTheme = "light" | "dark";
+
+export interface RenderedDiagram {
+  svg: string;
+  png: Buffer;
+}
+
+/**
+ * Bump this when the renderer's output contract changes. The value is part of
+ * the in-memory cache key so a long-lived extension host never reuses output
+ * produced by an older renderer implementation.
+ */
+export const DESCRIPTION_RENDERER_VERSION = "0.1.0";
+
+interface MermaidRenderResult {
+  svg: string;
+}
+
+interface MermaidApi {
+  initialize(config: unknown): void;
+  parse(text: string): Promise<unknown>;
+  render(id: string, text: string): Promise<MermaidRenderResult>;
+}
+
+const MERMAID_THEMES: Record<DescriptionTheme, "default" | "dark"> = {
+  light: "default",
+  dark: "dark"
+};
+
+const MERMAID_RENDER_OPTIONS = Object.freeze({
+  securityLevel: "strict",
+  htmlLabels: false,
+  flowchartHtmlLabels: false,
+  rasterizer: "@resvg/resvg-js@2.6.2",
+  maxRasterizedWidth: 2000,
+  viewBoxPadding: 2
+} as const);
+
+let mermaid: MermaidApi | undefined;
+let mermaidLoad: Promise<MermaidApi> | undefined;
+let diagramCounter = 0;
+const renderedDiagramCache = new Map<string, Promise<RenderedDiagram>>();
+let renderQueue = Promise.resolve();
+
+async function loadMermaid(): Promise<MermaidApi> {
+  const imported = await import("mermaid");
+  return imported.default as unknown as MermaidApi;
+}
+
+async function getMermaid(): Promise<MermaidApi> {
+  if (mermaid) {
+    return mermaid;
+  }
+
+  const load = (mermaidLoad ??= loadMermaid());
+  try {
+    mermaid = await load;
+    return mermaid;
+  } catch (error) {
+    if (mermaidLoad === load) {
+      mermaidLoad = undefined;
+    }
+    throw error;
+  }
+}
+
+function mermaidConfiguration(theme: DescriptionTheme) {
+  return {
+    startOnLoad: false,
+    securityLevel: MERMAID_RENDER_OPTIONS.securityLevel as "strict",
+    theme: MERMAID_THEMES[theme],
+    htmlLabels: MERMAID_RENDER_OPTIONS.htmlLabels,
+    flowchart: {
+      htmlLabels: MERMAID_RENDER_OPTIONS.flowchartHtmlLabels
+    }
+  };
+}
+
+function normalizeSvgSize(
+  svg: string,
+  viewBoxPadding: number
+): { svg: string; width: number } {
+  const window = ensureDomEnvironment();
+  const document = new window.DOMParser().parseFromString(svg, "image/svg+xml");
+  const root = document.documentElement;
+
+  const viewBox = (root.getAttribute("viewBox") || "")
+    .split(/[\s,]+/)
+    .map(part => Number(part))
+    .filter(part => !isNaN(part));
+
+  let bounds = {
+    x: 0,
+    y: 0,
+    width: 0,
+    height: 0
+  };
+
+  if (viewBox.length === 4) {
+    bounds = { x: viewBox[0], y: viewBox[1], width: viewBox[2], height: viewBox[3] };
+  } else {
+    bounds.width = Number(root.getAttribute("width")) || 800;
+    bounds.height = Number(root.getAttribute("height")) || 600;
+  }
+
+  const content = measureContentBounds(root);
+  bounds = {
+    x: Math.min(bounds.x, content.x - viewBoxPadding),
+    y: Math.min(bounds.y, content.y - viewBoxPadding),
+    width: 0,
+    height: 0
+  };
+  bounds.width = Math.max(
+    viewBox.length === 4 ? viewBox[0] + viewBox[2] : bounds.width,
+    content.x + content.width + viewBoxPadding
+  ) - bounds.x;
+  bounds.height = Math.max(
+    viewBox.length === 4 ? viewBox[1] + viewBox[3] : bounds.height,
+    content.y + content.height + viewBoxPadding
+  ) - bounds.y;
+
+  root.setAttribute(
+    "viewBox",
+    `${bounds.x} ${bounds.y} ${Math.ceil(bounds.width)} ${Math.ceil(bounds.height)}`
+  );
+  root.setAttribute("width", String(Math.ceil(bounds.width)));
+  root.setAttribute("height", String(Math.ceil(bounds.height)));
+  root.removeAttribute("style");
+
+  const normalized = new window.XMLSerializer().serializeToString(root);
+  return { svg: normalized, width: bounds.width };
+}
+
+async function renderMermaidDiagramUncached(
+  source: string,
+  theme: DescriptionTheme
+): Promise<RenderedDiagram> {
+  const render = async () => {
+    const kind = diagramKindOf(source);
+    if (!kind || !isAllowedDiagramKind(kind)) {
+      throw new Error(
+        `Unsupported Mermaid diagram kind: ${kind ?? "(none detected)"}`
+      );
+    }
+
+    ensureDomEnvironment();
+
+    const renderer = await getMermaid();
+    renderer.initialize(mermaidConfiguration(theme));
+    await renderer.parse(source);
+    const { svg } = await renderer.render(
+      `codetour-diagram-${++diagramCounter}`,
+      source
+    );
+
+    const sanitized = sanitizeSvg(svg);
+    const normalized = normalizeSvgSize(
+      sanitized,
+      MERMAID_RENDER_OPTIONS.viewBoxPadding
+    );
+    const png = rasterizeSvg(
+      normalized.svg,
+      normalized.width,
+      MERMAID_RENDER_OPTIONS.maxRasterizedWidth
+    );
+
+    return { svg: normalized.svg, png };
+  };
+
+  const queued = renderQueue.then(render, render);
+  renderQueue = queued.then(
+    () => undefined,
+    () => undefined
+  );
+  return queued;
+}
+
+function renderCacheKey(source: string, theme: DescriptionTheme): string {
+  return JSON.stringify({
+    source,
+    theme,
+    rendererVersion: DESCRIPTION_RENDERER_VERSION,
+    options: MERMAID_RENDER_OPTIONS
+  });
+}
+
+/** Clear all in-memory output, normally after VS Code changes its theme. */
+export function clearMermaidRenderCache(): void {
+  renderedDiagramCache.clear();
+}
+
+export const invalidateMermaidRenderCache = clearMermaidRenderCache;
+
+export function renderMermaidDiagram(
+  source: string,
+  theme: DescriptionTheme
+): Promise<RenderedDiagram> {
+  const key = renderCacheKey(source, theme);
+  const cached = renderedDiagramCache.get(key);
+  if (cached) {
+    return cached;
+  }
+
+  const rendered = renderMermaidDiagramUncached(source, theme);
+  renderedDiagramCache.set(key, rendered);
+  void rendered.catch(() => {
+    if (renderedDiagramCache.get(key) === rendered) {
+      renderedDiagramCache.delete(key);
+    }
+  });
+
+  return rendered;
+}
diff --git a/packages/description-renderer/src/rules.ts b/packages/description-renderer/src/rules.ts
new file mode 100644
index 00000000..00e0dccb
--- /dev/null
+++ b/packages/description-renderer/src/rules.ts
@@ -0,0 +1,76 @@
+export const ALLOWED_DIAGRAM_KINDS = [
+  "flowchart",
+  "sequenceDiagram",
+  "stateDiagram-v2",
+  "classDiagram",
+  "erDiagram"
+] as const;
+
+export type AllowedDiagramKind = (typeof ALLOWED_DIAGRAM_KINDS)[number];
+
+export const MAX_DIAGRAMS_PER_DESCRIPTION = 3;
+
+export const MAX_DIAGRAM_SOURCE_BYTES = 20 * 1024;
+
+export type DiagramRuleReason = "caption" | "size" | "kind";
+
+const MERMAID_FENCE_INFO_PATTERN = /^mermaid[ \t]*$/;
+
+const CAPTION_PATTERN = /^\s*\*\*(Diagram — (?:(?!\*\*).)+)\*\*[ \t]*$/;
+
+const SIGNIFICANT_LINE_PATTERN = /^(?!\s*%%)[^\s]/;
+
+export function isMermaidFenceInfo(info: string): boolean {
+  return MERMAID_FENCE_INFO_PATTERN.test(info);
+}
+
+export function isAllowedDiagramKind(kind: string): kind is AllowedDiagramKind {
+  return (ALLOWED_DIAGRAM_KINDS as readonly string[]).includes(kind);
+}
+
+export function matchDiagramCaption(line: string): string | undefined {
+  const match = line.match(CAPTION_PATTERN);
+  return match ? match[1].trim() : undefined;
+}
+
+export function diagramKindOf(source: string): string | undefined {
+  for (const line of source.split("\n")) {
+    if (!SIGNIFICANT_LINE_PATTERN.test(line)) {
+      continue;
+    }
+    return line.trim().split(/\s+/)[0];
+  }
+  return undefined;
+}
+
+export function diagramSourceByteLength(source: string): number {
+  return Buffer.byteLength(source, "utf8");
+}
+
+export interface DiagramFenceInput {
+  caption?: string;
+  source: string;
+}
+
+export type DiagramFenceEvaluation =
+  | { allowed: true; kind: AllowedDiagramKind }
+  | { allowed: false; reason: DiagramRuleReason; kind?: string };
+
+export function evaluateDiagramFence(
+  fence: DiagramFenceInput
+): DiagramFenceEvaluation {
+  if (!fence.caption) {
+    return { allowed: false, reason: "caption" };
+  }
+
+  if (diagramSourceByteLength(fence.source) > MAX_DIAGRAM_SOURCE_BYTES) {
+    return { allowed: false, reason: "size" };
+  }
+
+  const kind = diagramKindOf(fence.source);
+  if (!kind || !isAllowedDiagramKind(kind)) {
+    return { allowed: false, reason: "kind", kind };
+  }
+
+  return { allowed: true, kind };
+}
diff --git a/packages/description-renderer/src/sanitize.ts b/packages/description-renderer/src/sanitize.ts
new file mode 100644
index 00000000..fb27702f
--- /dev/null
+++ b/packages/description-renderer/src/sanitize.ts
@@ -0,0 +1,55 @@
+import { parseSvgDocument, serializeSvgDocument } from "./dom";
+
+const BLOCKED_ELEMENTS = new Set([
+  "script",
+  "foreignObject",
+  "iframe",
+  "object",
+  "embed",
+  "use",
+  "link",
+  "meta",
+  "base",
+  "image",
+  "img"
+]);
+
+const BLOCKED_ATTRIBUTE_PATTERN = /^on/i;
+const EXTERNAL_REFERENCE_PATTERN = /^(?!#)/;
+
+function sanitizeElement(element: Element): void {
+  for (const child of Array.from(element.children)) {
+    if (child.localName === "a") {
+      sanitizeElement(child);
+      for (const grandChild of Array.from(child.children)) {
+        element.insertBefore(grandChild, child);
+      }
+      element.removeChild(child);
+    } else if (BLOCKED_ELEMENTS.has(child.localName)) {
+      element.removeChild(child);
+    } else {
+      sanitizeElement(child);
+    }
+  }
+
+  for (const attribute of Array.from(element.attributes)) {
+    const name = attribute.name;
+    if (BLOCKED_ATTRIBUTE_PATTERN.test(name)) {
+      element.removeAttribute(name);
+      continue;
+    }
+
+    if (
+      (name === "href" || name === "xlink:href") &&
+      EXTERNAL_REFERENCE_PATTERN.test(attribute.value.trim())
+    ) {
+      element.removeAttribute(name);
+    }
+  }
+}
+
+export function sanitizeSvg(svg: string): string {
+  const document = parseSvgDocument(svg);
+  sanitizeElement(document.documentElement);
+  return serializeSvgDocument(document);
+}
diff --git a/packages/description-renderer/test/cache.test.ts b/packages/description-renderer/test/cache.test.ts
new file mode 100644
index 00000000..3f941d25
--- /dev/null
+++ b/packages/description-renderer/test/cache.test.ts
@@ -0,0 +1,41 @@
+import { test } from "node:test";
+import * as assert from "node:assert";
+import {
+  clearMermaidRenderCache,
+  invalidateMermaidRenderCache,
+  renderMermaidDiagram
+} from "../src/render";
+import { FLOWCHART_SOURCE } from "./helpers/fixtures";
+
+test.beforeEach(() => {
+  clearMermaidRenderCache();
+});
+
+test("renderMermaidDiagram reuses the exact source and effective theme", async () => {
+  const first = await renderMermaidDiagram(FLOWCHART_SOURCE, "light");
+  const second = await renderMermaidDiagram(FLOWCHART_SOURCE, "light");
+
+  assert.strictEqual(second, first);
+});
+
+test("renderMermaidDiagram keeps exact source and theme variants separate", async () => {
+  const light = await renderMermaidDiagram(FLOWCHART_SOURCE, "light");
+  const dark = await renderMermaidDiagram(FLOWCHART_SOURCE, "dark");
+  const sourceVariant = await renderMermaidDiagram(
+    `${FLOWCHART_SOURCE}\n`,
+    "light"
+  );
+
+  assert.notStrictEqual(dark, light);
+  assert.notStrictEqual(sourceVariant, light);
+  assert.notEqual(dark.svg, light.svg);
+});
+
+test("theme invalidation drops cached rendered diagrams", async () => {
+  const first = await renderMermaidDiagram(FLOWCHART_SOURCE, "light");
+
+  invalidateMermaidRenderCache();
+
+  const second = await renderMermaidDiagram(FLOWCHART_SOURCE, "light");
+  assert.notStrictEqual(second, first);
+});
diff --git a/packages/description-renderer/test/helpers/fixtures.ts b/packages/description-renderer/test/helpers/fixtures.ts
new file mode 100644
index 00000000..83a4ff3e
--- /dev/null
+++ b/packages/description-renderer/test/helpers/fixtures.ts
@@ -0,0 +1,213 @@
+export const PNG_SIGNATURE = Buffer.from([
+  0x89,
+  0x50,
+  0x4e,
+  0x47,
+  0x0d,
+  0x0a,
+  0x1a,
+  0x0a
+]);
+
+export function escapeRegExp(text: string): string {
+  return text.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
+}
+
+export function extractPngDataUri(markdown: string, altText: string): Buffer {
+  const pattern = new RegExp(
+    `!\\[${escapeRegExp(altText)}\\]\\(data:image\\/png;base64,([A-Za-z0-9+/=]+)\\)`
+  );
+  const match = markdown.match(pattern);
+  if (!match) {
+    throw new Error(
+      `Expected a PNG data URI image with alt text "${altText}" in:\n${markdown.slice(0, 400)}`
+    );
+  }
+  return Buffer.from(match[1], "base64");
+}
+
+export function assertValidPng(png: Buffer): void {
+  if (png.length < 200) {
+    throw new Error(`Expected a non-trivial PNG, got ${png.length} bytes`);
+  }
+  if (!png.subarray(0, 8).equals(PNG_SIGNATURE)) {
+    throw new Error("Expected a PNG signature at the start of the image");
+  }
+  const width = png.readUInt32BE(16);
+  const height = png.readUInt32BE(20);
+  if (width < 20 || height < 20) {
+    throw new Error(`Expected a visible diagram size, got ${width}x${height}`);
+  }
+  return void [width, height];
+}
+
+export function captionedDiagram(caption: string, source: string): string {
+  return ["**" + caption + "**", "", "```mermaid", source, "```"].join("\n");
+}
+
+export function findImageLine(markdown: string, altText: string): string {
+  const prefix = escapeRegExp(altText).replace(
+    /(\\\[|\\\])/g,
+    "\\\\?$1"
+  );
+  const pattern = new RegExp(`^!\\[${prefix}`);
+  const line = markdown.split("\n").find(line => pattern.test(line));
+  if (!line) {
+    throw new Error(
+      `Expected an image line with alt text "${altText}" in:\n${markdown.slice(0, 400)}`
+    );
+  }
+  return line;
+}
+
+export const FLOWCHART_SOURCE = [
+  "flowchart TD",
+  "    Client --> Gateway --> Service",
+  "    Service --> Database"
+].join("\n");
+
+export const CAPTIONED_FLOWCHART_DESCRIPTION = [
+  "The request flows through three layers:",
+  "",
+  "**Diagram — Request lifecycle**",
+  "",
+  "```mermaid",
+  FLOWCHART_SOURCE,
+  "```",
+  "",
+  "That is the whole story."
+].join("\n");
+
+export const ALLOWED_KIND_SOURCES: Record<string, string> = {
+  flowchart: FLOWCHART_SOURCE,
+  sequenceDiagram: [
+    "sequenceDiagram",
+    "    autonumber",
+    "    participant User",
+    "    participant Player as Tour Player",
+    "    User->>Player: Start tour",
+    "    Player-->>User: Step ready",
+    "    note right of Player: Diagrams render per fence"
+  ].join("\n"),
+  "stateDiagram-v2": [
+    "stateDiagram-v2",
+    "    [*] --> Idle",
+    "    Idle --> Loading: start tour",
+    "    Loading --> Playing: step found",
+    "    note right of Loading : waiting for the file",
+    "    Playing --> Done: finish",
+    "    Done --> [*]"
+  ].join("\n"),
+  classDiagram: [
+    "classDiagram",
+    "    class CodeTour {",
+    "        +string title",
+    "        +Step[] steps",
+    "        +start() void",
+    "        -persist()",
+    "    }",
+    "    class Step {",
+    "        +string description",
+    "    }",
+    "    CodeTour \"1\" *-- \"many\" Step : contains"
+  ].join("\n"),
+  erDiagram: [
+    "erDiagram",
+    "    TOUR ||--o{ STEP : contains",
+    "    STEP ||--|| FILE : anchors",
+    "    TOUR {",
+    "        string title \"the tour title\"",
+    "    }",
+    "    STEP {",
+    "        string description",
+    "        int line",
+    "    }"
+  ].join("\n")
+};
+
+export const ALLOWED_KIND_CAPTIONS: Record<string, string> = {
+  flowchart: "Diagram — Request lifecycle",
+  sequenceDiagram: "Diagram — Tour playback sequence",
+  "stateDiagram-v2": "Diagram — Tour playback states",
+  classDiagram: "Diagram — Tour data model",
+  erDiagram: "Diagram — Tour entity relationships"
+};
+
+export const UNSUPPORTED_KIND_SOURCES: Record<string, string> = {
+  pie: ['pie title Pets adopted', '    "Dogs" : 386', '    "Cats" : 85'].join(
+    "\n"
+  ),
+  gantt: [
+    "gantt",
+    "    title Release plan",
+    "    dateFormat YYYY-MM-DD",
+    "    section Build",
+    "    Package :p1, 2024-01-01, 3d"
+  ].join("\n"),
+  gitGraph: ["gitGraph", "    commit", "    branch feature", "    commit"].join(
+    "\n"
+  ),
+  mindmap: ["mindmap", "    root((tour))", "      steps"].join("\n"),
+  journey: [
+    "journey",
+    "    title Taking a tour",
+    "    section Start",
+    "      Me: 5: Me"
+  ].join("\n"),
+  "unknown kind": ["squarewave TD", "    A --> B"].join("\n")
+};
+
+export function flowchartOfExactByteLength(bytes: number): string {
+  const base = "flowchart TD\n    A --> B\n%%";
+  const padding = bytes - Buffer.byteLength(base, "utf8");
+  if (padding < 0) {
+    throw new Error(`Cannot build a flowchart of only ${bytes} bytes`);
+  }
+  return base + "x".repeat(padding);
+}
+
+export const HOSTILE_LABEL_SOURCES: Record<string, string> = {
+  flowchart: [
+    "flowchart TD",
+    '    A["<img src=x onerror=alert(1)>"] --> B["<script>alert(2)</script>"]'
+  ].join("\n"),
+  sequenceDiagram: [
+    "sequenceDiagram",
+    '    participant U as "<img src=x onerror=alert(1)>"',
+    '    U->>U: "<script>alert(2)</script>"'
+  ].join("\n"),
+  "stateDiagram-v2": [
+    "stateDiagram-v2",
+    "    [*] --> Idle",
+    '    Idle --> Playing: "<img src=x onerror=alert(1)>"',
+    '    state "<script>alert(2)</script>" as S',
+    "    Playing --> S"
+  ].join("\n"),
+  classDiagram: [
+    "classDiagram",
+    '    class Foo["<img src=x onerror=alert(1)>"] {',
+    "        +string bar",
+    "    }",
+    '    note for Foo "a note with <script>alert(2)</script>"'
+  ].join("\n"),
+  erDiagram: [
+    "erDiagram",
+    "    TOUR {",
+    '        string title "comment <script>alert(1)</script>"',
+    "    }"
+  ].join("\n")
+};
+
+export const HOSTILE_INTERACTION_SOURCE = [
+  "flowchart TD",
+  "    A --> B",
+  '    click A "https://example.com" "tooltip"',
+  '    click B href "https://example.com/linked" "tooltip"',
+  '    click A call alert(1) "tooltip"',
+  "    linkStyle 0 stroke:#f66,stroke-width:2px"
+].join("\n");
+
+export const HOSTILE_MARKDOWN_LABEL_SOURCE = [
+  "flowchart TD",
+  '    A["See [docs](https://evil.example) and [run](command:codetour.nextTourStep)"] --> B'
+].join("\n");
diff --git a/packages/description-renderer/test/offline.test.ts b/packages/description-renderer/test/offline.test.ts
new file mode 100644
index 00000000..0f9b103b
--- /dev/null
+++ b/packages/description-renderer/test/offline.test.ts
@@ -0,0 +1,141 @@
+import { test } from "node:test";
+import * as assert from "node:assert";
+import * as fs from "node:fs";
+import * as net from "node:net";
+import * as os from "node:os";
+import * as path from "node:path";
+import { renderDescription } from "../src/description";
+import {
+  ALLOWED_KIND_CAPTIONS,
+  ALLOWED_KIND_SOURCES,
+  CAPTIONED_FLOWCHART_DESCRIPTION,
+  assertValidPng,
+  captionedDiagram,
+  extractPngDataUri
+} from "./helpers/fixtures";
+
+function blockNetwork(): { attempts: () => number; restore: () => void } {
+  const originalFetch = globalThis.fetch;
+  const originalConnect = net.Socket.prototype.connect;
+  let attempted = 0;
+
+  const countAttempt = () => {
+    attempted++;
+  };
+
+  const failingConnect = (function(
+    this: net.Socket,
+    ...args: unknown[]
+  ): net.Socket {
+    countAttempt();
+    throw new Error("Network access was attempted during rendering");
+  } as unknown as typeof net.Socket.prototype.connect);
+
+  globalThis.fetch = (async () => {
+    countAttempt();
+    throw new Error("Network access was attempted during rendering");
+  }) as typeof fetch;
+
+  Object.defineProperty(net.Socket.prototype, "connect", {
+    value: failingConnect,
+    configurable: true,
+    writable: true,
+    enumerable: false
+  });
+
+  return {
+    attempts: () => attempted,
+    restore() {
+      globalThis.fetch = originalFetch;
+      Object.defineProperty(net.Socket.prototype, "connect", {
+        value: originalConnect,
+        configurable: true,
+        writable: true,
+        enumerable: false
+      });
+    }
+  };
+}
+
+function listFilesRecursive(directory: string): string[] {
+  const entries: string[] = [];
+  for (const entry of fs.readdirSync(directory, { withFileTypes: true })) {
+    const entryPath = path.join(directory, entry.name);
+    if (entry.isDirectory()) {
+      entries.push(...listFilesRecursive(entryPath));
+    } else {
+      entries.push(entryPath);
+    }
+  }
+  return entries;
+}
+
+test("renderDescription renders a flowchart with network access blocked", async () => {
+  const network = blockNetwork();
+
+  try {
+    const content = await renderDescription(
+      CAPTIONED_FLOWCHART_DESCRIPTION,
+      "light"
+    );
+    assertValidPng(extractPngDataUri(content, "Diagram — Request lifecycle"));
+    assert.equal(network.attempts(), 0);
+  } finally {
+    network.restore();
+  }
+});
+
+test("renderDescription renders the other allowed kinds with network access blocked", async () => {
+  const network = blockNetwork();
+
+  try {
+    for (const kind of [
+      "sequenceDiagram",
+      "stateDiagram-v2",
+      "classDiagram",
+      "erDiagram"
+    ]) {
+      const caption = ALLOWED_KIND_CAPTIONS[kind];
+      const content = await renderDescription(
+        captionedDiagram(caption, ALLOWED_KIND_SOURCES[kind]),
+        "light"
+      );
+      assertValidPng(extractPngDataUri(content, caption));
+    }
+    assert.equal(network.attempts(), 0);
+  } finally {
+    network.restore();
+  }
+});
+
+test("renderDescription creates no generated SVG or PNG file", async () => {
+  const sandbox = fs.mkdtempSync(path.join(os.tmpdir(), "codetour-renderer-"));
+  const previousCwd = process.cwd();
+
+  try {
+    process.chdir(sandbox);
+    const description = [
+      CAPTIONED_FLOWCHART_DESCRIPTION,
+      "",
+      captionedDiagram(
+        ALLOWED_KIND_CAPTIONS["stateDiagram-v2"],
+        ALLOWED_KIND_SOURCES["stateDiagram-v2"]
+      )
+    ].join("\n");
+    const content = await renderDescription(description, "dark");
+    assertValidPng(extractPngDataUri(content, "Diagram — Request lifecycle"));
+    assertValidPng(
+      extractPngDataUri(content, ALLOWED_KIND_CAPTIONS["stateDiagram-v2"])
+    );
+
+    const files = listFilesRecursive(sandbox);
+    assert.deepEqual(
+      files,
+      [],
+      "Expected the renderer to leave the workspace without generated assets"
+    );
+  } finally {
+    process.chdir(previousCwd);
+    fs.rmSync(sandbox, { recursive: true, force: true });
+  }
+});
diff --git a/packages/description-renderer/test/rules.test.ts b/packages/description-renderer/test/rules.test.ts
new file mode 100644
index 00000000..bf66b6b6
--- /dev/null
+++ b/packages/description-renderer/test/rules.test.ts
@@ -0,0 +1,160 @@
+import { test } from "node:test";
+import * as assert from "node:assert";
+import {
+  ALLOWED_DIAGRAM_KINDS,
+  MAX_DIAGRAMS_PER_DESCRIPTION,
+  MAX_DIAGRAM_SOURCE_BYTES,
+  diagramKindOf,
+  diagramSourceByteLength,
+  evaluateDiagramFence,
+  isAllowedDiagramKind,
+  isMermaidFenceInfo,
+  matchDiagramCaption
+} from "../src/rules";
+
+test("the allowlist accepts exactly the five first-version diagram kinds", () => {
+  assert.deepEqual(ALLOWED_DIAGRAM_KINDS, [
+    "flowchart",
+    "sequenceDiagram",
+    "stateDiagram-v2",
+    "classDiagram",
+    "erDiagram"
+  ]);
+  assert.equal(MAX_DIAGRAMS_PER_DESCRIPTION, 3);
+  assert.equal(MAX_DIAGRAM_SOURCE_BYTES, 20 * 1024);
+});
+
+test("diagramKindOf reads the kind from the first significant line", () => {
+  assert.equal(diagramKindOf("flowchart TD\n    A --> B"), "flowchart");
+  assert.equal(diagramKindOf("sequenceDiagram\n    A->>B: hi"), "sequenceDiagram");
+  assert.equal(
+    diagramKindOf("stateDiagram-v2\n    [*] --> Idle"),
+    "stateDiagram-v2"
+  );
+  assert.equal(diagramKindOf("classDiagram\n    class A"), "classDiagram");
+  assert.equal(diagramKindOf("erDiagram\n    A ||--o{ B : c"), "erDiagram");
+});
+
+test("diagramKindOf skips blank lines, comments and init directives", () => {
+  assert.equal(
+    diagramKindOf("\n\n%% a comment\n%%{init: {'theme':'base'}}%%\nflowchart TD\n    A --> B"),
+    "flowchart"
+  );
+});
+
+test("diagramKindOf returns undefined for empty or comment-only sources", () => {
+  assert.equal(diagramKindOf(""), undefined);
+  assert.equal(diagramKindOf("%% only a comment"), undefined);
+  assert.equal(diagramKindOf("   \n  \n"), undefined);
+});
+
+test("diagramKindOf takes the first token, not the whole line", () => {
+  assert.equal(diagramKindOf("pie title Pets"), "pie");
+  assert.equal(diagramKindOf("squarewave TD"), "squarewave");
+});
+
+test("the allowlist is exact: aliases and other kinds are unsupported", () => {
+  assert.equal(isAllowedDiagramKind("graph"), false);
+  assert.equal(isAllowedDiagramKind("stateDiagram"), false);
+  for (const kind of ["pie", "gantt", "mindmap", "journey", "gitGraph"]) {
+    assert.equal(isAllowedDiagramKind(kind), false);
+  }
+  assert.equal(isAllowedDiagramKind("Flowchart"), false);
+});
+
+test("isMermaidFenceInfo accepts only the bare mermaid info string", () => {
+  assert.equal(isMermaidFenceInfo("mermaid"), true);
+  assert.equal(isMermaidFenceInfo("mermaid "), true);
+  assert.equal(isMermaidFenceInfo("mermaid\t"), true);
+  assert.equal(isMermaidFenceInfo("ts"), false);
+  assert.equal(isMermaidFenceInfo("mermaid x"), false);
+  assert.equal(isMermaidFenceInfo("Mermaid"), false);
+  assert.equal(isMermaidFenceInfo(""), false);
+});
+
+test("matchDiagramCaption accepts a visible Diagram caption line", () => {
+  assert.equal(
+    matchDiagramCaption("**Diagram — Request lifecycle**"),
+    "Diagram — Request lifecycle"
+  );
+  assert.equal(
+    matchDiagramCaption("  **Diagram — Padded**  "),
+    "Diagram — Padded"
+  );
+  assert.equal(
+    matchDiagramCaption("**Diagram — Multi word caption with — dashes**"),
+    "Diagram — Multi word caption with — dashes"
+  );
+});
+
+test("matchDiagramCaption rejects malformed caption lines", () => {
+  assert.equal(matchDiagramCaption("*Diagram — single stars*"), undefined);
+  assert.equal(matchDiagramCaption("**Diagram – hyphen**"), undefined);
+  assert.equal(matchDiagramCaption("**Diagram — **"), undefined);
+  assert.equal(matchDiagramCaption("**Diagram —**"), undefined);
+  assert.equal(matchDiagramCaption("Diagram — bare"), undefined);
+  assert.equal(matchDiagramCaption("**Diagram — a** and **b**"), undefined);
+  assert.equal(matchDiagramCaption("**Not a diagram — caption**"), undefined);
+  assert.equal(matchDiagramCaption("Some intro text"), undefined);
+  assert.equal(matchDiagramCaption("```"), undefined);
+  assert.equal(matchDiagramCaption(""), undefined);
+});
+
+test("diagramSourceByteLength counts UTF-8 bytes, not characters", () => {
+  assert.equal(diagramSourceByteLength("flowchart TD"), 12);
+  assert.equal(diagramSourceByteLength("ééé"), 6);
+  assert.equal(diagramSourceByteLength("—"), 3);
+});
+
+test("evaluateDiagramFence allows an in-bounds supported diagram", () => {
+  assert.deepEqual(
+    evaluateDiagramFence({ caption: "Diagram — x", source: "flowchart TD\n    A --> B" }),
+    { allowed: true, kind: "flowchart" }
+  );
+});
+
+test("evaluateDiagramFence rejects a missing caption before anything else", () => {
+  const evaluation = evaluateDiagramFence({
+    source: "pie title way too large" + "x".repeat(MAX_DIAGRAM_SOURCE_BYTES)
+  });
+  assert.deepEqual(evaluation, { allowed: false, reason: "caption" });
+});
+
+test("evaluateDiagramFence rejects an oversized source before reading its kind", () => {
+  const evaluation = evaluateDiagramFence({
+    caption: "Diagram — too big",
+    source: "flowchart TD\n%%" + "x".repeat(MAX_DIAGRAM_SOURCE_BYTES)
+  });
+  assert.deepEqual(evaluation, { allowed: false, reason: "size" });
+});
+
+test("evaluateDiagramFence rejects an unsupported kind", () => {
+  const evaluation = evaluateDiagramFence({
+    caption: "Diagram — pie",
+    source: "pie title Pets\n    \"Dogs\" : 386"
+  });
+  assert.deepEqual(evaluation, { allowed: false, reason: "kind", kind: "pie" });
+});
+
+test("evaluateDiagramFence reports the detected kind alongside the rejection", () => {
+  const evaluation = evaluateDiagramFence({
+    caption: "Diagram — gantt",
+    source: "gantt\n    dateFormat YYYY-MM-DD"
+  });
+  assert.equal(evaluation.allowed, false);
+  if (!evaluation.allowed) {
+    assert.equal(evaluation.reason, "kind");
+    assert.equal(evaluation.kind, "gantt");
+  }
+});
+
+test("evaluateDiagramFence accepts a source of exactly 20 KB", () => {
+  const source = "flowchart TD\n%%" + "x".repeat(
+    MAX_DIAGRAM_SOURCE_BYTES - Buffer.byteLength("flowchart TD\n%%", "utf8")
+  );
+  const evaluation = evaluateDiagramFence({
+    caption: "Diagram — boundary",
+    source
+  });
+  assert.deepEqual(evaluation, { allowed: true, kind: "flowchart" });
+});
diff --git a/packages/description-renderer/test/seam.test.ts b/packages/description-renderer/test/seam.test.ts
new file mode 100644
index 00000000..ba72084b
--- /dev/null
+++ b/packages/description-renderer/test/seam.test.ts
@@ -0,0 +1,359 @@
+import { test } from "node:test";
+import * as assert from "node:assert";
+import { renderDescription } from "../src/description";
+import { renderMermaidDiagram } from "../src/render";
+import {
+  ALLOWED_KIND_CAPTIONS,
+  ALLOWED_KIND_SOURCES,
+  CAPTIONED_FLOWCHART_DESCRIPTION,
+  FLOWCHART_SOURCE,
+  UNSUPPORTED_KIND_SOURCES,
+  captionedDiagram,
+  extractPngDataUri,
+  flowchartOfExactByteLength,
+  assertValidPng
+} from "./helpers/fixtures";
+
+const COUNT_NOTICE_MARKER = "at most three Mermaid diagrams";
+const CAPTION_NOTICE_MARKER = "**Diagram — …** caption";
+const SIZE_NOTICE_MARKER = "20 KB limit";
+const KIND_NOTICE_MARKER = "Unsupported Mermaid diagram kind";
+const RENDER_NOTICE_MARKER = "could not be rendered";
+
+function assertNotice(content: string, marker: string): void {
+  assert.ok(
+    content.includes(marker),
+    `Expected the notice "${marker}" in:\n${content.slice(0, 400)}`
+  );
+}
+
+test("renderDescription renders a captioned flowchart as a PNG image", async () => {
+  const content = await renderDescription(
+    CAPTIONED_FLOWCHART_DESCRIPTION,
+    "light"
+  );
+
+  const png = extractPngDataUri(content, "Diagram — Request lifecycle");
+  assertValidPng(png);
+});
+
+test("renderDescription keeps the caption visible and uses it as alt text", async () => {
+  const content = await renderDescription(
+    CAPTIONED_FLOWCHART_DESCRIPTION,
+    "light"
+  );
+
+  assert.ok(content.includes("**Diagram — Request lifecycle**"));
+  assert.ok(content.includes("![Diagram — Request lifecycle](data:image/png"));
+});
+
+test("renderDescription hides the Mermaid source during playback", async () => {
+  const content = await renderDescription(
+    CAPTIONED_FLOWCHART_DESCRIPTION,
+    "light"
+  );
+
+  assert.ok(!content.includes("```mermaid"));
+  assert.ok(!content.includes("flowchart TD"));
+  assert.ok(!content.includes("Client --> Gateway"));
+});
+
+test("renderDescription returns descriptions without Mermaid unchanged", async () => {
+  const description = [
+    "A plain description with text.",
+    "",
+    "```ts",
+    "const answer = 42;",
+    "```",
+    "",
+    "[Next tour](command:codetour.startTourByTitle?%5B%22Next%22%5D)"
+  ].join("\n");
+
+  assert.equal(await renderDescription(description, "light"), description);
+  assert.equal(await renderDescription(description, "dark"), description);
+});
+
+test("renderDescription renders every allowed diagram kind through the seam", async () => {
+  for (const [kind, source] of Object.entries(ALLOWED_KIND_SOURCES)) {
+    const caption = ALLOWED_KIND_CAPTIONS[kind];
+    const content = await renderDescription(captionedDiagram(caption, source), "light");
+
+    const png = extractPngDataUri(content, caption);
+    assertValidPng(png);
+    assert.ok(content.includes(`**${caption}**`), kind);
+    assert.ok(!content.includes("```mermaid"), kind);
+    assert.ok(!content.includes(source), kind);
+  }
+});
+
+test("renderDescription renders a sequence diagram with message arrows", async () => {
+  const content = await renderDescription(
+    captionedDiagram(
+      ALLOWED_KIND_CAPTIONS.sequenceDiagram,
+      ALLOWED_KIND_SOURCES.sequenceDiagram
+    ),
+    "light"
+  );
+
+  assertValidPng(
+    extractPngDataUri(content, ALLOWED_KIND_CAPTIONS.sequenceDiagram)
+  );
+});
+
+test("renderDescription renders a class diagram with members", async () => {
+  const content = await renderDescription(
+    captionedDiagram(
+      ALLOWED_KIND_CAPTIONS.classDiagram,
+      ALLOWED_KIND_SOURCES.classDiagram
+    ),
+    "light"
+  );
+
+  assertValidPng(
+    extractPngDataUri(content, ALLOWED_KIND_CAPTIONS.classDiagram)
+  );
+});
+
+test("renderDescription fails an unsupported kind locally, keeping the caption as alternative text", async () => {
+  for (const [label, source] of Object.entries(UNSUPPORTED_KIND_SOURCES)) {
+    const caption = `Diagram — ${label} attempt`;
+    const content = await renderDescription(captionedDiagram(caption, source), "light");
+
+    assertNotice(content, KIND_NOTICE_MARKER);
+    assert.ok(content.includes(`**${caption}**`), label);
+    assert.ok(!content.includes("```mermaid"), label);
+    assert.ok(!content.includes(source), label);
+  }
+});
+
+test("renderDescription fails a Mermaid fence without a caption, without exposing its source", async () => {
+  const description = [
+    "Some text that is not a caption.",
+    "",
+    "```mermaid",
+    FLOWCHART_SOURCE,
+    "```"
+  ].join("\n");
+
+  const content = await renderDescription(description, "light");
+
+  assertNotice(content, CAPTION_NOTICE_MARKER);
+  assert.ok(!content.includes("```mermaid"));
+  assert.ok(!content.includes(FLOWCHART_SOURCE));
+});
+
+test("renderDescription fails a Mermaid fence whose caption is malformed", async () => {
+  for (const captionLine of [
+    "*Diagram — single stars*",
+    "**Diagram – wrong dash**",
+    "**Diagram —**",
+    "**Diagram — a** and **b**"
+  ]) {
+    const description = [captionLine, "", "```mermaid", FLOWCHART_SOURCE, "```"].join("\n");
+
+    const content = await renderDescription(description, "light");
+
+    assertNotice(content, CAPTION_NOTICE_MARKER);
+    assert.ok(!content.includes("```mermaid"), captionLine);
+    assert.ok(!content.includes(FLOWCHART_SOURCE), captionLine);
+  }
+});
+
+test("renderDescription fails a Mermaid fence with markdown between the caption and the fence", async () => {
+  const description = [
+    "**Diagram — Interrupted**",
+    "",
+    "Read this first:",
+    "",
+    "```mermaid",
+    FLOWCHART_SOURCE,
+    "```"
+  ].join("\n");
+
+  const content = await renderDescription(description, "light");
+
+  assertNotice(content, CAPTION_NOTICE_MARKER);
+  assert.ok(!content.includes("```mermaid"));
+  assert.ok(!content.includes(FLOWCHART_SOURCE));
+});
+
+test("a caption can only introduce a single fence", async () => {
+  const description = [
+    "**Diagram — First**",
+    "",
+    "```mermaid",
+    FLOWCHART_SOURCE,
+    "```",
+    "```mermaid",
+    FLOWCHART_SOURCE,
+    "```"
+  ].join("\n");
+
+  const content = await renderDescription(description, "light");
+
+  assertValidPng(extractPngDataUri(content, "Diagram — First"));
+  assertNotice(content, CAPTION_NOTICE_MARKER);
+  assert.ok(!content.includes("```mermaid"));
+});
+
+test("renderDescription fails a diagram source over 20 KB", async () => {
+  const source = flowchartOfExactByteLength(20 * 1024 + 1);
+  const content = await renderDescription(
+    captionedDiagram("Diagram — Too big", source),
+    "light"
+  );
+
+  assertNotice(content, SIZE_NOTICE_MARKER);
+  assert.ok(content.includes("**Diagram — Too big**"));
+  assert.ok(!content.includes("```mermaid"));
+  assert.ok(!content.includes(source.slice(0, 200)));
+});
+
+test("renderDescription renders a diagram source of exactly 20 KB", async () => {
+  const source = flowchartOfExactByteLength(20 * 1024);
+  const content = await renderDescription(
+    captionedDiagram("Diagram — Boundary", source),
+    "light"
+  );
+
+  assertValidPng(extractPngDataUri(content, "Diagram — Boundary"));
+});
+
+test("renderDescription renders at most three diagrams and fails the excess locally", async () => {
+  const description = [1, 2, 3, 4, 5]
+    .map(number =>
+      captionedDiagram(`Diagram — Chart ${number}`, FLOWCHART_SOURCE)
+    )
+    .join("\n\n");
+
+  const content = await renderDescription(description, "light");
+
+  for (const number of [1, 2, 3]) {
+    assertValidPng(
+      extractPngDataUri(content, `Diagram — Chart ${number}`)
+    );
+  }
+  const excessNotices = content
+    .split("\n")
+    .filter(line => line.includes(COUNT_NOTICE_MARKER));
+  assert.equal(excessNotices.length, 2);
+  assert.ok(content.includes("**Diagram — Chart 4**"));
+  assert.ok(content.includes("**Diagram — Chart 5**"));
+  assert.ok(!content.includes("```mermaid"));
+});
+
+test("the first three fences count toward the limit even when they fail other rules", async () => {
+  const description = [
+    "Intro text",
+    "",
+    "```mermaid",
+    FLOWCHART_SOURCE,
+    "```",
+    "",
+    captionedDiagram("Diagram — Unsupported", UNSUPPORTED_KIND_SOURCES.pie),
+    captionedDiagram("Diagram — Valid", FLOWCHART_SOURCE),
+    captionedDiagram("Diagram — Fourth", FLOWCHART_SOURCE)
+  ].join("\n");
+
+  const content = await renderDescription(description, "light");
+
+  assertValidPng(extractPngDataUri(content, "Diagram — Valid"));
+  assertNotice(content, CAPTION_NOTICE_MARKER);
+  assertNotice(content, KIND_NOTICE_MARKER);
+  assertNotice(content, COUNT_NOTICE_MARKER);
+  assert.ok(!content.includes("```mermaid"));
+});
+
+test("renderDescription replaces an invalid diagram with a warning, not its source", async () => {
+  const description = [
+    "**Diagram — Broken diagram**",
+    "",
+    "```mermaid",
+    "flowchart TD",
+    "    this is not mermaid at all (((",
+    "```"
+  ].join("\n");
+
+  const content = await renderDescription(description, "light");
+
+  assert.ok(!content.includes("```mermaid"));
+  assert.ok(!content.includes("this is not mermaid at all"));
+  assertNotice(content, RENDER_NOTICE_MARKER);
+  assert.ok(content.includes("**Diagram — Broken diagram**"));
+});
+
+test("renderDescription renders diagrams in one description independently", async () => {
+  const description = [
+    "**Diagram — Valid diagram**",
+    "",
+    "```mermaid",
+    FLOWCHART_SOURCE,
+    "```",
+    "",
+    "**Diagram — Broken diagram**",
+    "",
+    "```mermaid",
+    "flowchart TD",
+    "    this is not mermaid at all (((",
+    "```"
+  ].join("\n");
+
+  const content = await renderDescription(description, "light");
+
+  assertValidPng(extractPngDataUri(content, "Diagram — Valid diagram"));
+  assertNotice(content, RENDER_NOTICE_MARKER);
+  assert.ok(!content.includes("this is not mermaid at all"));
+});
+
+test("one rejected diagram never hides its valid siblings", async () => {
+  const description = [
+    "Plain text above",
+    "",
+    "```mermaid",
+    FLOWCHART_SOURCE,
+    "```",
+    "",
+    captionedDiagram("Diagram — Supported", FLOWCHART_SOURCE),
+    captionedDiagram("Diagram — Unsupported", UNSUPPORTED_KIND_SOURCES.gitGraph)
+  ].join("\n");
+
+  const content = await renderDescription(description, "light");
+
+  assertValidPng(extractPngDataUri(content, "Diagram — Supported"));
+  assertNotice(content, CAPTION_NOTICE_MARKER);
+  assertNotice(content, KIND_NOTICE_MARKER);
+  assert.ok(!content.includes("```mermaid"));
+});
+
+test("renderDescription adapts the rendered diagram to the theme", async () => {
+  const light = await renderMermaidDiagram(FLOWCHART_SOURCE, "light");
+  const dark = await renderMermaidDiagram(FLOWCHART_SOURCE, "dark");
+
+  assertValidPng(light.png);
+  assertValidPng(dark.png);
+  assert.notEqual(light.svg, dark.svg);
+  assert.ok(Buffer.compare(light.png, dark.png) !== 0);
+});
+
+test("renderMermaidDiagram returns a sanitized SVG and an in-memory PNG", async () => {
+  const { svg, png } = await renderMermaidDiagram(FLOWCHART_SOURCE, "light");
+
+  assert.ok(svg.startsWith("<svg"));
+  assert.ok(svg.includes('viewBox="'));
+  assert.ok(svg.includes(">Client</tspan>"));
+  assertValidPng(png);
+});
+
+test("renderMermaidDiagram refuses unsupported diagram kinds itself", async () => {
+  for (const source of [
+    UNSUPPORTED_KIND_SOURCES.pie,
+    UNSUPPORTED_KIND_SOURCES.mindmap,
+    UNSUPPORTED_KIND_SOURCES["unknown kind"]
+  ]) {
+    await assert.rejects(
+      () => renderMermaidDiagram(source, "light"),
+      /Unsupported Mermaid diagram kind/u,
+      source.split("\n")[0]
+    );
+  }
+});
diff --git a/packages/description-renderer/test/security.test.ts b/packages/description-renderer/test/security.test.ts
new file mode 100644
index 00000000..ff00381e
--- /dev/null
+++ b/packages/description-renderer/test/security.test.ts
@@ -0,0 +1,211 @@
+import { test } from "node:test";
+import * as assert from "node:assert";
+import { renderDescription } from "../src/description";
+import { renderMermaidDiagram } from "../src/render";
+import { sanitizeSvg } from "../src/sanitize";
+import {
+  CAPTIONED_FLOWCHART_DESCRIPTION,
+  HOSTILE_INTERACTION_SOURCE,
+  HOSTILE_LABEL_SOURCES,
+  HOSTILE_MARKDOWN_LABEL_SOURCE,
+  assertValidPng,
+  captionedDiagram,
+  extractPngDataUri,
+  findImageLine
+} from "./helpers/fixtures";
+
+const IMAGE_LINE_PATTERN = /^!\[[^\n]*\]\(data:image\/png;base64,[A-Za-z0-9+/=]+\)$/;
+
+function assertStaticImageLine(content: string, caption: string): void {
+  const line = findImageLine(content, caption);
+  assert.match(line, IMAGE_LINE_PATTERN);
+  assert.ok(!line.includes("<"));
+}
+
+test("strict security encodes hostile labels instead of embedding HTML", async () => {
+  const source = [
+    "flowchart TD",
+    '    A["<img src=x onerror=alert(1)>"] --> B["<script>alert(2)</script>"]'
+  ].join("\n");
+
+  const { svg } = await renderMermaidDiagram(source, "light");
+
+  assert.ok(!svg.includes("<img"));
+  assert.ok(!svg.includes("onerror"));
+  assert.ok(!svg.includes("<script"));
+  assert.ok(!svg.includes("<foreignObject"));
+});
+
+test("strict security renders click interactions without anchors or handlers", async () => {
+  const source = [
+    "flowchart TD",
+    "    A --> B",
+    '    click A "https://example.com" "tooltip"'
+  ].join("\n");
+
+  const { svg } = await renderMermaidDiagram(source, "light");
+
+  assert.ok(!svg.includes("<a "));
+  assert.ok(!svg.includes("onclick"));
+  assert.ok(!svg.includes("href"));
+});
+
+test("strict security keeps labels as SVG text, not embedded HTML", async () => {
+  const { svg } = await renderMermaidDiagram(
+    "flowchart TD\n    A[Label] --> B",
+    "light"
+  );
+
+  assert.ok(!svg.includes("foreignObject"));
+  assert.ok(svg.includes("<tspan"));
+});
+
+test("hostile labels in every allowed kind render as a static image only", async () => {
+  for (const [kind, source] of Object.entries(HOSTILE_LABEL_SOURCES)) {
+    const caption = `Diagram — Hostile ${kind}`;
+    const content = await renderDescription(captionedDiagram(caption, source), "light");
+
+    assertStaticImageLine(content, caption);
+    assertValidPng(extractPngDataUri(content, caption));
+    assert.ok(!content.includes("<script"), kind);
+    assert.ok(!content.includes("```mermaid"), kind);
+  }
+});
+
+test("hostile labels that fail to parse fall back to a warning, not the source", async () => {
+  const caption = "Diagram — Hostile parse failure";
+  const content = await renderDescription(
+    captionedDiagram(
+      caption,
+      'flowchart TD\n    A["<script>alert(1)</script>"] is totally broken ((('
+    ),
+    "light"
+  );
+
+  assert.ok(content.includes("could not be rendered"));
+  assert.ok(!content.includes("<script"));
+  assert.ok(!content.includes("<img"));
+  assert.ok(!content.includes("```mermaid"));
+});
+
+test("click callbacks, hrefs and link styles cannot become active output", async () => {
+  const caption = "Diagram — Hostile interactions";
+  const content = await renderDescription(
+    captionedDiagram(caption, HOSTILE_INTERACTION_SOURCE),
+    "light"
+  );
+
+  assertStaticImageLine(content, caption);
+  assertValidPng(extractPngDataUri(content, caption));
+  assert.ok(!content.includes("<a "));
+  assert.ok(!content.includes("](https://"));
+  assert.ok(!content.includes("command:codetour.nextTourStep"));
+  assert.ok(!content.includes("```mermaid"));
+});
+
+test("markdown links inside labels cannot become active output", async () => {
+  const caption = "Diagram — Hostile markdown label";
+  const content = await renderDescription(
+    captionedDiagram(caption, HOSTILE_MARKDOWN_LABEL_SOURCE),
+    "light"
+  );
+
+  assertStaticImageLine(content, caption);
+  assertValidPng(extractPngDataUri(content, caption));
+  assert.ok(!content.includes("](https://evil.example)"));
+  assert.ok(!content.includes("](command:"));
+});
+
+test("a caption containing brackets cannot break out of the image markdown", async () => {
+  const caption = "Diagram — Reads [docs](https://example.com) and [run](command:x)";
+  const content = await renderDescription(
+    captionedDiagram(caption, "flowchart TD\n    A --> B"),
+    "light"
+  );
+
+  assertStaticImageLine(content, caption);
+  const line = findImageLine(content, caption);
+  assert.equal(line.match(/!\[/g)!.length, 1);
+  assert.equal(line.match(/\]\(data:image\/png;base64,/g)!.length, 1);
+});
+
+test("the final comment content contains no diagram HTML or commands", async () => {
+  const content = await renderDescription(
+    CAPTIONED_FLOWCHART_DESCRIPTION,
+    "light"
+  );
+
+  const imageLine = findImageLine(content, "Diagram — Request lifecycle");
+  assert.ok(!imageLine.includes("<"));
+  assert.ok(!imageLine.includes("command:"));
+  assertValidPng(extractPngDataUri(content, "Diagram — Request lifecycle"));
+});
+
+test("sanitizeSvg removes scripts, handlers, foreign content and anchors", () => {
+  const hostile = [
+    '<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 10 10">',
+    "<script>alert(1)</script>",
+    '<foreignObject><div>html</div></foreignObject>',
+    '<rect x="0" y="0" width="4" height="4" onload="alert(2)"/>',
+    '<a xlink:href="javascript:alert(3)"><rect x="5" y="5" width="2" height="2"/></a>',
+    '<a href="https://example.com"><rect x="1" y="1" width="2" height="2"/></a>',
+    "</svg>"
+  ].join("");
+
+  const sanitized = sanitizeSvg(hostile);
+
+  assert.ok(!sanitized.includes("<script"));
+  assert.ok(!sanitized.includes("foreignObject"));
+  assert.ok(!sanitized.includes("onload"));
+  assert.ok(!sanitized.includes("javascript:"));
+  assert.ok(!sanitized.includes("href"));
+  assert.ok(sanitized.includes("<rect"));
+});
+
+test("sanitizeSvg removes remote resource elements and external references", () => {
+  const hostile = [
+    '<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 10 10">',
+    '<image x="0" y="0" width="4" height="4" xlink:href="https://evil.example/logo.png"/>',
+    '<img x="5" y="5" width="2" height="2" href="https://evil.example/pixel.gif"/>',
+    '<image x="0" y="6" width="2" height="2" href="data:text/html,hello"/>',
+    '<rect x="8" y="8" width="1" height="1" href="https://evil.example/styled"/>',
+    "</svg>"
+  ].join("");
+
+  const sanitized = sanitizeSvg(hostile);
+
+  assert.ok(!sanitized.includes("<image"));
+  assert.ok(!sanitized.includes("<img"));
+  assert.ok(!sanitized.includes("evil.example"));
+  assert.ok(!sanitized.includes("data:text/html"));
+  assert.ok(sanitized.includes("<rect"));
+});
+
+test("sanitizeSvg keeps internal fragment references", () => {
+  const ordinary = [
+    '<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 10 10">',
+    '<defs><path id="label-path" d="M0,0 H10"/></defs>',
+    '<text><textPath xlink:href="#label-path">Label</textPath></text>',
+    "</svg>"
+  ].join("");
+
+  const sanitized = sanitizeSvg(ordinary);
+
+  assert.ok(sanitized.includes('xlink:href="#label-path"'));
+  assert.ok(sanitized.includes("<textPath"));
+});
+
+test("sanitizeSvg preserves ordinary diagram markup", () => {
+  const ordinary = [
+    '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 10 10">',
+    '<g transform="translate(1,1)"><text y="1"><tspan>Label</tspan></text></g>',
+    '<rect x="0" y="0" width="4" height="4" fill="#ECECFF"/>',
+    "</svg>"
+  ].join("");
+
+  const sanitized = sanitizeSvg(ordinary);
+
+  assert.ok(sanitized.includes("<tspan>Label</tspan>"));
+  assert.ok(sanitized.includes('fill="#ECECFF"'));
+  assert.ok(sanitized.includes('transform="translate(1,1)"'));
+});
diff --git a/packages/description-renderer/tsconfig.json b/packages/description-renderer/tsconfig.json
new file mode 100644
index 00000000..11d5bb8b
--- /dev/null
+++ b/packages/description-renderer/tsconfig.json
@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2022", "DOM"],
+    "module": "node16",
+    "moduleResolution": "node16",
+    "outDir": "dist",
+    "rootDir": ".",
+    "strict": true,
+    "noUnusedLocals": true,
+    "esModuleInterop": true,
+    "resolveJsonModule": true,
+    "skipLibCheck": true,
+    "sourceMap": true,
+    "declaration": true,
+    "types": ["node"]
+  },
+  "include": ["src", "test"]
+}
diff --git a/packages/mcp-server/LICENSE.txt b/packages/mcp-server/LICENSE.txt
new file mode 100644
index 00000000..b2f52a2b
--- /dev/null
+++ b/packages/mcp-server/LICENSE.txt
@@ -0,0 +1,21 @@
+Copyright (c) Microsoft Corporation.
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/packages/mcp-server/README.md b/packages/mcp-server/README.md
new file mode 100644
index 00000000..a529e44d
--- /dev/null
+++ b/packages/mcp-server/README.md
@@ -0,0 +1,339 @@
+# codetour-mcp
+
+A local MCP (Model Context Protocol) server that lets an AI agent create
+[CodeTour](https://github.com/microsoft/codetour) tours deterministically.
+The agent analyzes the code and writes the explanations; the server validates
+the proposal, applies the Git and security rules, and atomically replaces the
+reserved tour file.
+
+Two specialized tools are exposed:
+
+- `create_project_tour` — a **Project Tour** that explains a codebase as a
+  whole, written to `.tours/project.tour`.
+- `create_changes_tour` — a **Changes Tour** that explains the committed
+  changes on a branch since it diverged from a base ref, written to
+  `.tours/changes.tour`.
+
+Both outputs are compatible with the general CodeTour schema, within a
+deliberately stricter V1 subset: explanatory Markdown and workspace-internal
+locations only. CodeTour `commands`, root-level `when` expressions, external
+`uri` steps, and active Markdown schemes (`command:`, `file:`, `vscode:`,
+`vscode-insiders:`, `javascript:`) are rejected.
+
+Mermaid diagrams are optional and validated before either tool writes a Tour.
+The MCP server reuses the exact fence rules and locked Mermaid implementation
+from `codetour-description-renderer`, so the Tour Generator and playback apply
+the same contract. Validation is local and offline.
+
+## Requirements
+
+- Node.js >= 18
+- Git (only for `create_changes_tour`)
+
+## Démarrage rapide
+
+Depuis la racine du dépôt, installez d'abord le renderer partagé, puis les
+dépendances du serveur MCP et vérifiez les deux packages :
+
+```bash
+cd packages/description-renderer
+npm install
+npm run build
+cd ../mcp-server
+npm install
+npm test
+```
+
+`npm test` compile le package et exécute toute la suite de tests. Vous pouvez
+ensuite démarrer le serveur depuis un workspace :
+
+```bash
+cd /path/to/workspace
+node /path/to/codetour/packages/mcp-server/dist/src/cli.js
+```
+
+Le processus utilise MCP sur `stdio`. Il attend donc silencieusement les
+requêtes d'un client MCP. Utilisez `Ctrl+C` pour l'arrêter lorsqu'il est lancé
+manuellement.
+
+Le répertoire de travail du processus est le workspace. Une instance du serveur
+traite exactement ce workspace et toutes les opérations y sont confinées : les chemins
+réels sont résolus avant toute lecture ou écriture, les liens symboliques qui
+sortent de la racine sont refusés et le serveur n'effectue aucun accès réseau.
+
+Le package expose le binaire `codetour-mcp`, disponible après `npm install` ou
+`npm link`. Pour rendre ce binaire accessible globalement pendant le
+développement local :
+
+```bash
+npm link
+cd /path/to/workspace
+codetour-mcp
+```
+
+Configurez enfin votre client MCP avec la commande et son répertoire de travail,
+comme dans l'exemple ci-dessous. Une fois connecté, le client découvre
+automatiquement `create_project_tour` et `create_changes_tour`.
+
+## MCP client configuration
+
+```json
+{
+  "mcpServers": {
+    "codetour": {
+      "command": "node",
+      "args": ["/path/to/codetour/packages/mcp-server/dist/src/cli.js"],
+      "cwd": "/path/to/workspace"
+    }
+  }
+}
+```
+
+The transport is `stdio` only.
+
+### Configuration dans Codex
+
+L'extension VS Code fournit les commandes `CodeTour: Configure MCP for Codex`
+et `CodeTour: Repair MCP Configuration for Codex`. La première installe la
+configuration globale lorsqu'elle manque ; la seconde remplace une
+configuration obsolète, notamment après une mise à jour de l'extension.
+
+Pour un build de développement non installé en VSIX, l'équivalent manuel est :
+
+```bash
+codex mcp add codetour -- \
+  node /path/to/codetour/dist/mcp-server.js
+```
+
+Il n'est pas nécessaire de conserver un processus lancé manuellement : Codex
+démarre le serveur `stdio` automatiquement. Vérifiez la configuration avec :
+
+```bash
+codex mcp get codetour
+```
+
+Les nouvelles tâches Codex démarrent le serveur dans leur propre répertoire de
+travail ; une seule configuration globale couvre donc tous les projets.
+
+Pour générer le tour général du projet, demandez par exemple :
+
+```text
+Analyse ce dépôt, puis utilise l'outil MCP codetour.create_project_tour pour
+générer un Project Tour. Présente le but du projet, ses points d'entrée, ses
+composants importants et ses principaux flux d'exécution. Commence par une
+étape ancrée sur le dossier racine pour en expliquer l'organisation, puis
+présente les dossiers importants avant de détailler les fichiers. Utilise des
+ancres stables dans les fichiers lorsque c'est possible.
+```
+
+Pour limiter le Project Tour à un sous-dossier, nommez-le explicitement dans la
+demande. La première étape doit alors utiliser ce chemin dans son champ
+`directory`, relativement à la racine du workspace.
+
+Le résultat est écrit dans `.tours/project.tour`.
+
+Pour documenter les changements de la branche courante :
+
+```text
+Analyse les changements commités de cette branche depuis sa branche de base,
+puis utilise codetour.create_changes_tour pour créer un Changes Tour. Détermine
+la référence de base et utilise le SHA complet du HEAD actuel. N'inclus pas les
+modifications non commitées.
+```
+
+Le résultat est écrit dans `.tours/changes.tour`.
+
+## Tools
+
+### `create_project_tour`
+
+| Argument      | Type     | Required | Description                                             |
+| ------------- | -------- | -------- | ------------------------------------------------------- |
+| `title`       | string   | no       | Defaults to `Project Overview`.                         |
+| `description` | string   | no       | Optional tour description.                              |
+| `steps`       | object[] | yes      | Non-empty list of steps (see below).                    |
+
+A good Project Tour covers the project's purpose, its main entry points, its
+important components, and its main execution flows. When the project has a
+meaningful directory structure, it begins with a directory-anchored overview.
+For a Project Tour scoped to a subdirectory, the first step anchors that exact
+workspace-relative directory. Other important directories should be introduced
+before their individual files.
+
+### `create_changes_tour`
+
+| Argument             | Type     | Required | Description                                                   |
+| -------------------- | -------- | -------- | ------------------------------------------------------------- |
+| `baseRef`             | string   | yes      | Git ref the branch diverged from.                             |
+| `headRef`             | string   | yes      | Full 40-character SHA of the analyzed commit; must equal the current `HEAD`. |
+| `includeUncommittedChanges` | boolean  | no       | Include uncommitted changes explicitly (default `false`).     |
+| `title`              | string   | no       | Defaults to `Changes on <branch>`.                            |
+| `description`        | string   | no       | Optional description; provenance is always appended.          |
+| `steps`              | object[] | yes      | Non-empty list of steps (see below).                          |
+
+A good Changes Tour covers the intent of the changes, the major
+modifications, their impact, and the relevant tests.
+
+### Steps
+
+| Field         | Type   | Description                                                                  |
+| ------------- | ------ | ---------------------------------------------------------------------------- |
+| `title`       | string | Optional step title.                                                         |
+| `description` | string | Required Markdown explanation.                                               |
+| `file`        | string | Workspace-relative path; at most one of `file`/`directory` per step.         |
+| `directory`   | string | Workspace-relative path; use for structural overview steps and at most one of `file`/`directory` per step. |
+| `line`        | number | 1-based line; only valid with `file`, mutually exclusive with `pattern`.     |
+| `pattern`     | string | Regular expression matching exactly one occurrence; only valid with `file`.  |
+| `selection`   | object | `{ start: {line, character}, end: {line, character} }`, 1-based; only valid with `file`. |
+
+Steps without any locator are allowed (general context, deleted files).
+Every anchor is validated against the real workspace state. All validation
+errors are aggregated and reported in a single response; the previous tour
+file is preserved on failure.
+
+### Mermaid diagrams
+
+Use Mermaid sparingly: include a diagram only when it materially clarifies a
+relationship or flow. A diagram must use a bare fence with `mermaid` as its
+info string. The nearest non-blank line before that fence must be a visible caption matching
+`**Diagram — …**` (an em dash, with one or more descriptive characters). Blank
+lines between the caption and fence are allowed; other Markdown content breaks
+the caption association.
+
+The exact allowlist is `flowchart`, `sequenceDiagram`, `stateDiagram-v2`,
+`classDiagram`, and `erDiagram`. Each individual description (the Tour
+description and each step description are separate descriptions) accepts at
+most three Mermaid fences, and each source is at most 20 KiB measured as UTF-8
+bytes. Mermaid syntax is parsed locally using the same locked version as
+playback. A malformed caption, unsupported kind, oversized source, invalid
+syntax, or fourth-and-later fence rejects the complete tool call.
+
+Diagram issues use paths such as
+`steps[1].description.mermaid[0].source`; the path identifies the description,
+fence index, and failing field. Every issue also reports the fence's starting
+line and column. All descriptions are checked in one call, and no Tour file is
+written when any diagram or ordinary Tour validation fails.
+
+### Result
+
+Each successful tool call returns a human-readable message and a structure:
+
+```json
+{ "status": "created", "path": ".tours/project.tour", "stepCount": 3, "warnings": [] }
+```
+
+Failures return `{ "status": "error", "code", "message", "issues" }` with one
+of these codes:
+
+| Code                       | Meaning                                                        |
+| -------------------------- | -------------------------------------------------------------- |
+| `TOUR_STEPS_REQUIRED`      | The steps list is missing or empty.                            |
+| `INVALID_PROPOSAL`         | The proposal has validation issues (all listed in `issues`).   |
+| `GIT_REPOSITORY_REQUIRED`  | `create_changes_tour` was called outside a Git repository.     |
+| `STALE_HEAD`               | `headRef` does not match the current `HEAD`.                      |
+| `INVALID_BASE_REF`         | The merge-base between `baseRef` and `headRef` cannot be computed. |
+| `NO_CHANGES`               | No committed changes between the merge-base and `headRef`; the previous tour file is preserved. |
+| `SCHEMA_VALIDATION_FAILED` | Internal: the generated tour did not validate against the CodeTour schema. |
+| `OUTPUT_PATH_ESCAPES_WORKSPACE` | The output directory resolves outside the workspace root. |
+
+Non-blocking warnings:
+
+| Code                            | Meaning                                                                  |
+| ------------------------------- | ------------------------------------------------------------------------ |
+| `STEP_LIMIT_EXCEEDED`           | The tour has more than fifteen steps.                                    |
+| `NO_CHANGED_FILE_ANCHOR`        | No step anchors a file modified by the changes.                          |
+| `UNCOMMITTED_CHANGES_EXCLUDED`  | Staged, unstaged or untracked changes were excluded (default).           |
+| `UNCOMMITTED_CHANGES_INCLUDED`  | Uncommitted changes were included; the tour describes a non-reproducible local state. |
+
+## Git reference policies
+
+- A Project Tour has no CodeTour `ref`, so it stays usable as the project
+  evolves.
+- A reproducible Changes Tour records the exact analyzed head SHA as its
+  `ref`, and generation fails with `STALE_HEAD` if `HEAD` changed since the
+  analysis. Uncommitted changes are excluded by default (with a warning).
+- With `includeUncommittedChanges: true`, the Changes Tour has no `ref` and warns
+  that it describes a non-reproducible local state.
+
+The reserved tour files (`.tours/project.tour` and `.tours/changes.tour`) are
+always replaced after a complete, successful validation, via an atomic
+rename. They are excluded from the dirty-workspace detection so a previous
+generation does not warn about itself.
+
+## Development
+
+Install the package dependencies once:
+
+```bash
+cd packages/description-renderer
+npm install
+npm run build
+cd ../mcp-server
+npm install
+```
+
+### Run all tests
+
+From `packages/mcp-server/`:
+
+```bash
+npm test
+```
+
+The renderer must be built before the MCP package because the MCP server uses
+its public shared-rule surface as a local package dependency. The MCP test
+command then compiles the package and runs the complete Node.js test suite from
+`dist/test/`.
+
+The same suite can be launched from the repository root without changing
+directory:
+
+```bash
+npm test --prefix packages/mcp-server
+```
+
+### Run the type checker or build only
+
+```bash
+npm run typecheck   # validate TypeScript without producing files
+npm run build       # compile sources and tests into dist/
+```
+
+From the repository root, append `--prefix packages/mcp-server` to either
+command.
+
+### Run one test file
+
+Individual tests run from the compiled `dist/test/` tree, so build the package
+first. For example:
+
+```bash
+npm run build
+node --test dist/test/integration/changes-tour.test.js
+node --test dist/test/integration/project-tour.test.js
+node --test dist/test/integration/security.test.js
+node --test dist/test/integration/cli.test.js
+node --test dist/test/integration/packaged-binary.test.js
+node --test dist/test/unit/validation.test.js
+```
+
+You can also filter tests in a file by name:
+
+```bash
+node --test --test-name-pattern="STALE_HEAD" \
+  dist/test/integration/changes-tour.test.js
+```
+
+### What the tests exercise
+
+- Project Tour and Changes Tour calls through the public MCP `stdio` seam;
+- Tour Anchor, schema and V1 security validation;
+- Git merge-base, stale `HEAD`, dirty-workspace and deletion-only scenarios;
+- atomic replacement and preservation of an existing Tour after failures;
+- CLI argument validation;
+- `npm pack`, local installation of the archive, execution of the installed
+  `codetour-mcp` binary, and invocation of both public MCP tools.
+
+Integration tests create isolated temporary workspaces and Git repositories
+and remove them after each scenario. The packaging smoke test stays local and
+does not publish anything to npm.
diff --git a/packages/mcp-server/package-lock.json b/packages/mcp-server/package-lock.json
new file mode 100644
index 00000000..3544f610
--- /dev/null
+++ b/packages/mcp-server/package-lock.json
@@ -0,0 +1,3212 @@
+{
+  "name": "codetour-mcp",
+  "version": "0.1.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "codetour-mcp",
+      "version": "0.1.0",
+      "license": "MIT",
+      "dependencies": {
+        "@modelcontextprotocol/sdk": "^1.30.0",
+        "@resvg/resvg-js": "2.6.2",
+        "ajv": "^6.12.6",
+        "codetour-description-renderer": "file:../description-renderer",
+        "jsdom": "26.1.0",
+        "mermaid": "11.12.2",
+        "zod": "^3.25.76"
+      },
+      "bin": {
+        "codetour-mcp": "dist/src/cli.js"
+      },
+      "devDependencies": {
+        "@types/node": "^24.0.0",
+        "typescript": "^5.8.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "../description-renderer": {
+      "name": "codetour-description-renderer",
+      "version": "0.1.0",
+      "license": "MIT",
+      "dependencies": {
+        "@resvg/resvg-js": "2.6.2",
+        "jsdom": "26.1.0",
+        "mermaid": "11.12.2"
+      },
+      "devDependencies": {
+        "@types/jsdom": "27.0.0",
+        "@types/node": "24.13.3",
+        "typescript": "5.9.3"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@antfu/install-pkg": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@antfu/install-pkg/-/install-pkg-1.1.0.tgz",
+      "integrity": "sha512-MGQsmw10ZyI+EJo45CdSER4zEb+p31LpDAFp2Z3gkSd1yqVZGi0Ebx++YTEMonJy4oChEMLsxZ64j8FH6sSqtQ==",
+      "license": "MIT",
+      "dependencies": {
+        "package-manager-detector": "^1.3.0",
+        "tinyexec": "^1.0.1"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
+      }
+    },
+    "node_modules/@asamuzakjp/css-color": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-3.2.0.tgz",
+      "integrity": "sha512-K1A6z8tS3XsmCMM86xoWdn7Fkdn9m6RSVtocUrJYIwZnFVkng/PvkEoWtOWmP+Scc6saYWHWZYbndEEXxl24jw==",
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/css-calc": "^2.1.3",
+        "@csstools/css-color-parser": "^3.0.9",
+        "@csstools/css-parser-algorithms": "^3.0.4",
+        "@csstools/css-tokenizer": "^3.0.3",
+        "lru-cache": "^10.4.3"
+      }
+    },
+    "node_modules/@braintree/sanitize-url": {
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/@braintree/sanitize-url/-/sanitize-url-7.1.2.tgz",
+      "integrity": "sha512-jigsZK+sMF/cuiB7sERuo9V7N9jx+dhmHHnQyDSVdpZwVutaBu7WvNYqMDLSgFgfB30n452TP3vjDAvFC973mA==",
+      "license": "MIT"
+    },
+    "node_modules/@chevrotain/cst-dts-gen": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/@chevrotain/cst-dts-gen/-/cst-dts-gen-11.0.3.tgz",
+      "integrity": "sha512-BvIKpRLeS/8UbfxXxgC33xOumsacaeCKAjAeLyOn7Pcp95HiRbrpl14S+9vaZLolnbssPIUuiUd8IvgkRyt6NQ==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@chevrotain/gast": "11.0.3",
+        "@chevrotain/types": "11.0.3",
+        "lodash-es": "4.17.21"
+      }
+    },
+    "node_modules/@chevrotain/cst-dts-gen/node_modules/lodash-es": {
+      "version": "4.17.21",
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+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-3.1.1.tgz",
+      "integrity": "sha512-6qN4hJdMwfYBtE3YBTTHhoeuUrDBPZmbQaxWAqSALV/MeEnR5z1xd8UKud2RAkFoPkmB+hli1TZSnyi84xz1vQ==",
+      "deprecated": "Use @exodus/bytes instead for a more spec-conformant and faster implementation",
+      "license": "MIT",
+      "dependencies": {
+        "iconv-lite": "0.6.3"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/whatwg-encoding/node_modules/iconv-lite": {
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
+      "integrity": "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==",
+      "license": "MIT",
+      "dependencies": {
+        "safer-buffer": ">= 2.1.2 < 3.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/whatwg-mimetype": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-4.0.0.tgz",
+      "integrity": "sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/whatwg-url": {
+      "version": "14.2.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-14.2.0.tgz",
+      "integrity": "sha512-De72GdQZzNTUBBChsXueQUnPKDkg/5A5zp7pFDuQAj5UFoENpiACU0wlCvzpAGnTkj++ihpKwKyYewn/XNUbKw==",
+      "license": "MIT",
+      "dependencies": {
+        "tr46": "^5.1.0",
+        "webidl-conversions": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/which": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "license": "ISC",
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "license": "ISC"
+    },
+    "node_modules/ws": {
+      "version": "8.21.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.21.3.tgz",
+      "integrity": "sha512-201TZ/kPWxoPr/OKWjquZR1SWKXcvxdH+e1xrx89b3YbmzLMFCLfnaG1HFIgWzJOEWZ7MvpK++odZufgYR50Rw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/xml-name-validator": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
+      "integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "license": "MIT"
+    },
+    "node_modules/zod": {
+      "version": "3.25.76",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
+      "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
+    },
+    "node_modules/zod-to-json-schema": {
+      "version": "3.25.2",
+      "resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.25.2.tgz",
+      "integrity": "sha512-O/PgfnpT1xKSDeQYSCfRI5Gy3hPf91mKVDuYLUHZJMiDFptvP41MSnWofm8dnCm0256ZNfZIM7DSzuSMAFnjHA==",
+      "license": "ISC",
+      "peerDependencies": {
+        "zod": "^3.25.28 || ^4"
+      }
+    }
+  }
+}
diff --git a/packages/mcp-server/package.json b/packages/mcp-server/package.json
new file mode 100644
index 00000000..4ad03742
--- /dev/null
+++ b/packages/mcp-server/package.json
@@ -0,0 +1,50 @@
+{
+  "name": "codetour-mcp",
+  "version": "0.1.0",
+  "description": "Local MCP server that deterministically validates and persists AI-generated CodeTour Project Tours and Changes Tours",
+  "license": "MIT",
+  "author": {
+    "name": "Microsoft Corporation"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/microsoft/codetour",
+    "directory": "packages/mcp-server"
+  },
+  "bin": {
+    "codetour-mcp": "dist/src/cli.js"
+  },
+  "main": "dist/src/server.js",
+  "files": [
+    "dist/src",
+    "dist/node_modules/codetour-description-renderer",
+    "dist/package.json",
+    "dist/schema.json",
+    "schema.json",
+    "README.md",
+    "LICENSE.txt"
+  ],
+  "engines": {
+    "node": ">=18"
+  },
+  "scripts": {
+    "build": "tsc -p tsconfig.json && node ../../scripts/stage-mcp-renderer.js",
+    "typecheck": "tsc -p tsconfig.json --noEmit",
+    "prepack": "node ../../scripts/stage-mcp-renderer.js",
+    "test": "npm run build && node ../../scripts/run-compiled-tests.js dist/test",
+    "start": "node dist/src/cli.js"
+  },
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.30.0",
+    "@resvg/resvg-js": "2.6.2",
+    "ajv": "^6.12.6",
+    "codetour-description-renderer": "file:../description-renderer",
+    "jsdom": "26.1.0",
+    "mermaid": "11.12.2",
+    "zod": "^3.25.76"
+  },
+  "devDependencies": {
+    "@types/node": "^24.0.0",
+    "typescript": "^5.8.0"
+  }
+}
diff --git a/packages/mcp-server/schema.json b/packages/mcp-server/schema.json
new file mode 100644
index 00000000..ea8e63ab
--- /dev/null
+++ b/packages/mcp-server/schema.json
@@ -0,0 +1,149 @@
+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "title": "Schema for CodeTour tour files",
+  "type": "object",
+  "required": ["title", "steps"],
+  "properties": {
+    "title": {
+      "type": "string",
+      "description": "Specifies the title of the code tour."
+    },
+    "description": {
+      "type": "string",
+      "description": "Specifies an optional description for the code tour."
+    },
+    "ref": {
+      "type": "string",
+      "description": "Indicates the git ref (branch/commit/tag) that this tour associate with."
+    },
+    "isPrimary": {
+      "type": "boolean",
+      "description": "Specifies whether the tour represents the primary tour for this codebase."
+    },
+    "steps": {
+      "type": "array",
+      "description": "Specifies the list of steps that are included in the code tour.",
+      "default": [],
+      "items": {
+        "type": "object",
+        "required": ["description"],
+        "properties": {
+          "file": {
+            "type": "string",
+            "description": "File path (relative to the workspace root) that the step is associated with."
+          },
+          "directory": {
+            "type": "string",
+            "description": "Directory path (relative to the workspace root) that the step is associated with."
+          },
+          "view": {
+            "anyOf": [
+              {
+                "type": "string",
+                "enum": [
+                  "debug",
+                  "debug:breakpoints",
+                  "debug:callstack",
+                  "debug:variables",
+                  "debug:watch",
+                  "explorer",
+                  "extensions",
+                  "extensions:disabled",
+                  "extensions:enabled",
+                  "output",
+                  "problems",
+                  "scm",
+                  "search",
+                  "terminal"
+                ],
+                "description": "The view ID (e.g. gistpad.gists) that this step is associated with."
+              },
+              {
+                "type": "string",
+                "minLength": 1,
+                "description": "The view ID (e.g. gistpad.gists) that this step is associated with."
+              }
+            ]
+          },
+          "uri": {
+            "type": "string",
+            "description": "Absolute URI that is associated with the step."
+          },
+          "line": {
+            "type": "number",
+            "description": "Line number that the step is associated with."
+          },
+          "pattern": {
+            "type": "string",
+            "description": "A regular expression to associate the step with. This is only considered when the line property isn't set, and allows you to associate steps with line content as opposed to ordinal."
+          },
+          "title": {
+            "type": "string",
+            "description": "An optional title for the step."
+          },
+          "description": {
+            "type": "string",
+            "description": "Description of the step."
+          },
+          "selection": {
+            "type": "object",
+            "required": ["start", "end"],
+            "description": "Text selection that's associated with the step.",
+            "properties": {
+              "start": {
+                "type": "object",
+                "required": ["line", "character"],
+                "description": "Starting position (line, column) of the text selection range.",
+                "properties": {
+                  "line": {
+                    "type": "number",
+                    "description": "Line number (1-based) that the text selection begins on."
+                  },
+                  "character": {
+                    "type": "number",
+                    "description": "Column number (1-based) that the text selection begins on."
+                  }
+                }
+              },
+              "end": {
+                "type": "object",
+                "required": ["line", "character"],
+                "description": "Ending position (line, column) of the text selection range.",
+                "properties": {
+                  "line": {
+                    "type": "number",
+                    "description": "Line number (1-based) that the text selection ends on."
+                  },
+                  "character": {
+                    "type": "number",
+                    "description": "Column number (1-based) that the text selection end on."
+                  }
+                }
+              }
+            }
+          },
+          "commands": {
+            "type": "array",
+            "description": "Specifies an array of command URIs that will be executed when this step is navigated to.",
+            "default": [],
+            "items": {
+              "type": "string"
+            }
+          }
+        }
+      }
+    },
+    "stepMarker": {
+      "type": "string",
+      "description": "Specifies the 'marker' that indicates a line of code represents a step for this tour."
+    },
+    "nextTour": {
+      "type": "string",
+      "description": "Specifies the title of the tour that is meant to follow this tour."
+    },
+    "when": {
+      "type": "string",
+      "description": "Specifies the condition that must be met before this tour is shown. The value of this property is a string that is evaluated as JavaScript."
+    }
+  }
+}
diff --git a/packages/mcp-server/src/cli.ts b/packages/mcp-server/src/cli.ts
new file mode 100644
index 00000000..c7559d37
--- /dev/null
+++ b/packages/mcp-server/src/cli.ts
@@ -0,0 +1,76 @@
+#!/usr/bin/env node
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import { createContext } from "./context";
+import { createServer } from "./server";
+import packageJson from "../package.json";
+
+// Point d'entrée du binaire `codetour-mcp`.
+// Le serveur ne traite qu'un seul workspace : le répertoire de travail du
+// processus. Les clients MCP savent tous définir ce répertoire sans ajouter un
+// argument propriétaire au protocole de lancement.
+
+interface ParsedArgs {
+  help: boolean;
+  version: boolean;
+}
+
+function usage(): string {
+  return [
+    `codetour-mcp v${packageJson.version}`,
+    "Local MCP server for AI-generated CodeTour Project Tours and Changes Tours.",
+    "",
+    "Usage: codetour-mcp",
+    "",
+    "Options:",
+    "  --help, -h               Show this help",
+    "  --version, -v            Show the version",
+  ].join("\n");
+}
+
+// Analyse les arguments de la ligne de commande.
+function parseArgs(argv: string[]): ParsedArgs {
+  const result: ParsedArgs = { help: false, version: false };
+  for (let index = 0; index < argv.length; index++) {
+    const argument = argv[index];
+    if (argument === "--help" || argument === "-h") {
+      result.help = true;
+    } else if (argument === "--version" || argument === "-v") {
+      result.version = true;
+    } else {
+      console.error(`Unknown argument: ${argument}\n\n${usage()}`);
+      process.exit(1);
+    }
+  }
+  return result;
+}
+
+async function main(): Promise<void> {
+  const args = parseArgs(process.argv.slice(2));
+  if (args.help) {
+    console.log(usage());
+    return;
+  }
+  if (args.version) {
+    console.log(packageJson.version);
+    return;
+  }
+  const workspaceRoot = process.cwd();
+  // Vérifie le répertoire de travail avant de démarrer, pour échouer clairement.
+  try {
+    createContext(workspaceRoot);
+  } catch {
+    console.error(
+      `Error: the working directory is not an accessible workspace: ${workspaceRoot}`
+    );
+    process.exit(1);
+  }
+
+  const server = createServer(workspaceRoot);
+  const transport = new StdioServerTransport();
+  await server.connect(transport);
+}
+
+main().catch((error) => {
+  console.error(error);
+  process.exit(1);
+});
diff --git a/packages/mcp-server/src/codetour-schema.ts b/packages/mcp-server/src/codetour-schema.ts
new file mode 100644
index 00000000..be92b466
--- /dev/null
+++ b/packages/mcp-server/src/codetour-schema.ts
@@ -0,0 +1,11 @@
+import Ajv from "ajv";
+import draft04MetaSchema from "ajv/lib/refs/json-schema-draft-04.json";
+import codetourSchema from "../schema.json";
+
+// Validation de la sortie contre le schéma CodeTour général (draft-04) : le
+// serveur applique son schéma d'entrée plus strict, puis garantit que le
+// fichier produit reste compatible avec le consommateur existant.
+const ajv = new Ajv({ allErrors: true, meta: false, schemaId: "id" });
+ajv.addMetaSchema(draft04MetaSchema);
+
+export const validateCodetourTour = ajv.compile(codetourSchema);
diff --git a/packages/mcp-server/src/context.ts b/packages/mcp-server/src/context.ts
new file mode 100644
index 00000000..3d22b772
--- /dev/null
+++ b/packages/mcp-server/src/context.ts
@@ -0,0 +1,12 @@
+import * as fs from "fs";
+import * as path from "path";
+import { WorkspaceContext } from "./types";
+
+// Contexte du workspace : la racine telle que fournie, plus sa résolution en
+// chemin réel. Toute vérification de confinement compare les chemins réels,
+// afin qu'un lien symbolique ne puisse pas sortir de la racine configurée.
+export function createContext(workspaceRoot: string): WorkspaceContext {
+  const root = path.resolve(workspaceRoot);
+  const realRoot = fs.realpathSync(root);
+  return { root, realRoot };
+}
diff --git a/packages/mcp-server/src/git.ts b/packages/mcp-server/src/git.ts
new file mode 100644
index 00000000..d86a897e
--- /dev/null
+++ b/packages/mcp-server/src/git.ts
@@ -0,0 +1,175 @@
+import { execFile } from "child_process";
+import * as fs from "fs";
+import * as path from "path";
+import { WorkspaceContext } from "./types";
+
+// Toutes les opérations Git du serveur passent par `git` en ligne de commande,
+// exécuté dans le workspace configuré. Le Changes Tour dépend de cet
+// historique : merge-base, vérification du SHA de tête, liste des fichiers
+// modifiés et détection des changements non committés.
+
+export interface GitResult {
+  stdout: string;
+  stderr: string;
+  code: number;
+}
+
+export function git(args: string[], cwd: string): Promise<GitResult> {
+  return new Promise((resolve) => {
+    execFile(
+      "git",
+      args,
+      { cwd, encoding: "utf8", maxBuffer: 128 * 1024 * 1024 },
+      (error, stdout, stderr) => {
+        const code =
+          error == null
+            ? 0
+            : typeof (error as { code?: unknown }).code === "number"
+            ? ((error as { code?: unknown }).code as number)
+            : 1;
+        resolve({ stdout: stdout ?? "", stderr: stderr ?? "", code });
+      }
+    );
+  });
+}
+
+export async function isGitRepository(ctx: WorkspaceContext): Promise<boolean> {
+  const result = await git(["rev-parse", "--is-inside-work-tree"], ctx.root);
+  return result.code === 0 && result.stdout.trim() === "true";
+}
+
+export async function currentHeadSha(
+  ctx: WorkspaceContext
+): Promise<string | null> {
+  const result = await git(["rev-parse", "HEAD"], ctx.root);
+  return result.code === 0 ? result.stdout.trim() : null;
+}
+
+export async function currentBranchName(
+  ctx: WorkspaceContext
+): Promise<string | null> {
+  const result = await git(["rev-parse", "--abbrev-ref", "HEAD"], ctx.root);
+  return result.code === 0 ? result.stdout.trim() : null;
+}
+
+export async function mergeBase(
+  ctx: WorkspaceContext,
+  a: string,
+  b: string
+): Promise<string> {
+  const result = await git(["merge-base", a, b], ctx.root);
+  if (result.code !== 0) {
+    throw new Error(
+      result.stderr.trim() || `git merge-base failed (exit code ${result.code})`
+    );
+  }
+  return result.stdout.trim();
+}
+
+export async function committedDiffIsEmpty(
+  ctx: WorkspaceContext,
+  a: string,
+  b: string
+): Promise<boolean> {
+  const result = await git(["diff", "--quiet", a, b], ctx.root);
+  return result.code === 0;
+}
+
+export async function changedFiles(
+  ctx: WorkspaceContext,
+  a: string,
+  b: string
+): Promise<string[]> {
+  const result = await git(["diff", "--name-only", "-z", a, b], ctx.root);
+  if (result.code !== 0) {
+    throw new Error(
+      result.stderr.trim() || `git diff failed (exit code ${result.code})`
+    );
+  }
+  return result.stdout.split("\0").filter((entry) => entry.length > 0);
+}
+
+export async function workspacePrefix(ctx: WorkspaceContext): Promise<string> {
+  const result = await git(["rev-parse", "--show-prefix"], ctx.root);
+  return result.code === 0 ? result.stdout.trim() : "";
+}
+
+export const RESERVED_TOUR_FILES = [
+  ".tours/project.tour",
+  ".tours/changes.tour",
+];
+
+export interface UncommittedEntry {
+  path: string;
+  status: string;
+}
+
+export function normalizeSlashes(value: string): string {
+  return value.replace(/\\/g, "/");
+}
+
+// Changements staged, unstaged et untracked du workspace, à l'exception des
+// deux fichiers de Tour réservés : une génération précédente ne doit pas
+// provoquer son propre avertissement de workspace sale.
+export async function uncommittedChanges(
+  ctx: WorkspaceContext
+): Promise<UncommittedEntry[]> {
+  const result = await git(
+    ["status", "--porcelain=v1", "--untracked-files=normal"],
+    ctx.root
+  );
+  if (result.code !== 0) {
+    return [];
+  }
+  const prefix = normalizeSlashes(await workspacePrefix(ctx));
+  const entries: UncommittedEntry[] = [];
+  for (const line of result.stdout.split("\n")) {
+    if (line.length < 4) {
+      continue;
+    }
+    const status = line.slice(0, 2);
+    let repoPath = line.slice(3);
+    if ((status.includes("R") || status.includes("C")) && repoPath.includes(" -> ")) {
+      repoPath = repoPath.slice(0, repoPath.indexOf(" -> "));
+    }
+    if (!normalizeSlashes(repoPath).startsWith(prefix)) {
+      continue;
+    }
+    let workspacePath = normalizeSlashes(repoPath).slice(prefix.length);
+    if (status === "??" && workspacePath.endsWith("/")) {
+      const directory = workspacePath.slice(0, -1);
+      if (directory === ".tours" && toursDirectoryOnlyContainsReserved(ctx, directory)) {
+        continue;
+      }
+    }
+    if (RESERVED_TOUR_FILES.includes(workspacePath)) {
+      continue;
+    }
+    entries.push({ path: workspacePath, status });
+  }
+  return entries;
+}
+
+// Un répertoire `.tours` non suivi apparaît sous la forme d'une seule entrée
+// `?? .tours/` en mode « normal » : on l'ignore uniquement si son contenu se
+// limite aux fichiers de Tour réservés.
+function toursDirectoryOnlyContainsReserved(
+  ctx: WorkspaceContext,
+  directory: string
+): boolean {
+  const absolute = path.resolve(ctx.root, directory);
+  let files: string[];
+  try {
+    files = fs.readdirSync(absolute, { recursive: true }) as string[];
+  } catch {
+    return false;
+  }
+  return (
+    files.length > 0 &&
+    files.every((file) =>
+      RESERVED_TOUR_FILES.includes(
+        normalizeSlashes(path.posix.join(directory, file))
+      )
+    )
+  );
+}
diff --git a/packages/mcp-server/src/mermaid-validation.ts b/packages/mcp-server/src/mermaid-validation.ts
new file mode 100644
index 00000000..7ed4ef5b
--- /dev/null
+++ b/packages/mcp-server/src/mermaid-validation.ts
@@ -0,0 +1,156 @@
+import {
+  ALLOWED_DIAGRAM_KINDS,
+  MAX_DIAGRAMS_PER_DESCRIPTION,
+  MAX_DIAGRAM_SOURCE_BYTES,
+  diagramKindOf,
+  evaluateDiagramFence,
+  findDiagramFences,
+  matchDiagramCaption,
+  renderMermaidDiagram,
+} from "codetour-description-renderer";
+import { Issue } from "./types";
+
+const MERMAID_TOOL_GUIDANCE =
+  `Use Mermaid sparingly: add a diagram only when it materially clarifies a relationship, flow, state, sequence, class, or entity. ` +
+  "If you use one, put the nearest non-blank line before a bare ```mermaid fence in the form " +
+  "**Diagram — …**; keep that caption visible and descriptive. " +
+  `Only these Mermaid kinds are allowed: ${ALLOWED_DIAGRAM_KINDS.join(", ")}. ` +
+  `Each description accepts at most ${MAX_DIAGRAMS_PER_DESCRIPTION} Mermaid fences, each source is limited to ` +
+  `${MAX_DIAGRAM_SOURCE_BYTES / 1024} KB, and every source must have valid Mermaid syntax. ` +
+  `Validation is offline, reports all diagram errors with their description, fence, and source location, ` +
+  `and preserves the previous Tour when any error is found.`;
+
+export { MERMAID_TOOL_GUIDANCE };
+
+async function parseMermaid(source: string): Promise<void> {
+  // renderMermaidDiagram uses the exact locked Mermaid engine and the same
+  // strict configuration as playback. Its PNG is intentionally discarded:
+  // this call is the offline syntax-validation seam for the MCP server.
+  await renderMermaidDiagram(source, "light");
+}
+
+function isPlainObject(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null && !Array.isArray(value);
+}
+
+function lineAndColumnOf(description: string, offset: number): string {
+  const beforeFence = description.slice(0, offset);
+  const lastLineBreak = beforeFence.lastIndexOf("\n");
+  const line = beforeFence.split("\n").length;
+  const column = offset - lastLineBreak;
+  return `line ${line}, column ${column}`;
+}
+
+function fencePath(descriptionPath: string, index: number, field?: string): string {
+  const path = `${descriptionPath}.mermaid[${index}]`;
+  return field ? `${path}.${field}` : path;
+}
+
+function canonicalCaption(caption: string | undefined): string | undefined {
+  // findDiagramFences already applies the shared caption parser. Running the
+  // captured value through that same public function keeps this boundary tied
+  // to the renderer's caption grammar rather than reimplementing it here.
+  return caption === undefined
+    ? undefined
+    : matchDiagramCaption(`**${caption}**`);
+}
+
+async function validateDescription(
+  description: string,
+  descriptionPath: string
+): Promise<Issue[]> {
+  const issues: Issue[] = [];
+  const fences = findDiagramFences(description);
+
+  for (let index = 0; index < fences.length; index++) {
+    const fence = fences[index];
+    const location = lineAndColumnOf(description, fence.start);
+    if (index >= MAX_DIAGRAMS_PER_DESCRIPTION) {
+      issues.push({
+        path: fencePath(descriptionPath, index),
+        message:
+          `the Mermaid fence at ${location} exceeds the limit of ${MAX_DIAGRAMS_PER_DESCRIPTION} ` +
+          "fences per description",
+      });
+      continue;
+    }
+
+    if (!fence.closed) {
+      issues.push({
+        path: fencePath(descriptionPath, index, "source"),
+        message: `the Mermaid fence at ${location} is not closed`
+      });
+      continue;
+    }
+
+    const evaluation = evaluateDiagramFence({
+      caption: canonicalCaption(fence.caption),
+      source: fence.source,
+    });
+    if (!evaluation.allowed) {
+      const field =
+        evaluation.reason === "caption"
+          ? "caption"
+          : evaluation.reason === "kind"
+            ? "kind"
+            : "source";
+      let message: string;
+      if (evaluation.reason === "caption") {
+        message =
+          `the Mermaid fence at ${location} requires a nearest non-blank caption matching ` +
+          "**Diagram — …**";
+      } else if (evaluation.reason === "size") {
+        message =
+          `the Mermaid source at ${location} is ${Buffer.byteLength(fence.source, "utf8")} bytes; ` +
+          `the limit is ${MAX_DIAGRAM_SOURCE_BYTES} bytes`;
+      } else {
+        const detectedKind = diagramKindOf(fence.source);
+        message =
+          `the Mermaid source at ${location} uses unsupported kind ` +
+          `${detectedKind ? `"${detectedKind}"` : "(none detected)"}; ` +
+          `supported kinds are ${ALLOWED_DIAGRAM_KINDS.join(", ")}`;
+      }
+      issues.push({ path: fencePath(descriptionPath, index, field), message });
+      continue;
+    }
+
+    try {
+      await parseMermaid(fence.source);
+    } catch {
+      issues.push({
+        path: fencePath(descriptionPath, index, "source"),
+        message: `the Mermaid source at ${location} has invalid Mermaid syntax`,
+      });
+    }
+  }
+
+  return issues;
+}
+
+export async function validateMermaidDescriptions(raw: unknown): Promise<Issue[]> {
+  if (!isPlainObject(raw)) {
+    return [];
+  }
+
+  const descriptions: Array<{ value: string; path: string }> = [];
+  if (typeof raw.description === "string") {
+    descriptions.push({ value: raw.description, path: "description" });
+  }
+  if (Array.isArray(raw.steps)) {
+    for (let index = 0; index < raw.steps.length; index++) {
+      const step = raw.steps[index];
+      if (isPlainObject(step) && typeof step.description === "string") {
+        descriptions.push({
+          value: step.description,
+          path: `steps[${index}].description`,
+        });
+      }
+    }
+  }
+
+  const issues: Issue[] = [];
+  for (const description of descriptions) {
+    issues.push(...(await validateDescription(description.value, description.path)));
+  }
+  return issues;
+}
diff --git a/packages/mcp-server/src/persistence.ts b/packages/mcp-server/src/persistence.ts
new file mode 100644
index 00000000..660ab311
--- /dev/null
+++ b/packages/mcp-server/src/persistence.ts
@@ -0,0 +1,54 @@
+import * as fs from "fs";
+import * as path from "path";
+import { WorkspaceContext } from "./types";
+
+// Écriture atomique des Tours générés : le contenu est d'abord écrit dans un
+// fichier temporaire du même répertoire, synchronisé, puis renommé sur la
+// destination. Un échec ne laisse jamais de fichier partiellement écrit et
+// préserve la version précédente. Le répertoire de sortie doit rester confiné
+// au workspace (chemin réel résolu avant l'écriture).
+
+export class OutputPathError extends Error {}
+
+export async function writeTourAtomic(
+  ctx: WorkspaceContext,
+  relativeTarget: string,
+  content: string
+): Promise<void> {
+  const target = path.resolve(ctx.root, relativeTarget);
+  const directory = path.dirname(target);
+  await fs.promises.mkdir(directory, { recursive: true });
+
+  let realDirectory: string;
+  try {
+    realDirectory = fs.realpathSync(directory);
+  } catch (error) {
+    throw new OutputPathError(
+      `Unable to resolve the output directory: ${(error as Error).message}`
+    );
+  }
+  const relative = path.relative(ctx.realRoot, realDirectory);
+  if (relative.startsWith("..") || path.isAbsolute(relative)) {
+    throw new OutputPathError(
+      `${relativeTarget} resolves outside the workspace root`
+    );
+  }
+
+  const tempFile = path.join(
+    directory,
+    `.${path.basename(target)}.tmp-${process.pid}-${Date.now()}`
+  );
+  const handle = await fs.promises.open(tempFile, "w");
+  try {
+    await handle.writeFile(content, "utf8");
+    await handle.sync();
+  } finally {
+    await handle.close();
+  }
+  try {
+    await fs.promises.rename(tempFile, target);
+  } catch (error) {
+    await fs.promises.unlink(tempFile).catch(() => undefined);
+    throw error;
+  }
+}
diff --git a/packages/mcp-server/src/server.ts b/packages/mcp-server/src/server.ts
new file mode 100644
index 00000000..2839f043
--- /dev/null
+++ b/packages/mcp-server/src/server.ts
@@ -0,0 +1,543 @@
+import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { z } from "zod";
+import { createContext } from "./context";
+import {
+  changedFiles,
+  committedDiffIsEmpty,
+  currentBranchName,
+  currentHeadSha,
+  isGitRepository,
+  mergeBase,
+  normalizeSlashes,
+  uncommittedChanges,
+  workspacePrefix,
+} from "./git";
+import { OutputPathError, writeTourAtomic } from "./persistence";
+import { validateCodetourTour } from "./codetour-schema";
+import {
+  ErrorResult,
+  Issue,
+  SuccessResult,
+  TourFile,
+  TourStep,
+  Warning,
+  WorkspaceContext,
+} from "./types";
+import {
+  MAX_RECOMMENDED_STEPS,
+  validateChangesParams,
+  validateProjectParams,
+  validateSteps,
+} from "./validation";
+import {
+  MERMAID_TOOL_GUIDANCE,
+  validateMermaidDescriptions,
+} from "./mermaid-validation";
+import packageJson from "../package.json";
+
+// Point de passage entre l'agent IA et CodeTour : l'agent propose une visite
+// complète, puis le serveur garantit qu'elle peut être ouverte sans risque dans
+// le projet. Deux usages sont proposés : découvrir le projet dans son ensemble
+// ou expliquer les changements de la branche courante.
+//
+// Les schémas d'entrée des outils restent volontairement permissifs
+// (`z.unknown()` + `.passthrough()`) : le SDK MCP rejette lui-même les arguments
+// qui ne correspondent pas à un schéma strict, ce qui casserait l'exigence
+// d'agréger toutes les erreurs de validation dans une seule réponse. La
+// validation complète, champ par champ, est donc effectuée dans validation.ts.
+
+const CODETOUR_SCHEMA_URI = "https://aka.ms/codetour-schema";
+const SERVER_NAME = "codetour-mcp";
+const SERVER_VERSION = packageJson.version;
+
+// Chaque type de visite possède une destination stable. L'utilisateur retrouve
+// ainsi toujours la dernière visite générée au même endroit, sans que ces
+// fichiers soient eux-mêmes considérés comme des changements à expliquer.
+const PROJECT_TOUR_PATH = ".tours/project.tour";
+const CHANGES_TOUR_PATH = ".tours/changes.tour";
+
+const PROJECT_TOUR_DESCRIPTION =
+  "Creates a CodeTour Project Tour that explains a codebase as a whole, persisted at " +
+  ".tours/project.tour (replacing any previously generated tour of the same kind). " +
+  "You provide the fully written content; the server only validates and persists it deterministically. " +
+  "A good Project Tour ideally covers: the project's purpose, its main entry points, its important " +
+  "components, and its main execution flows. Begin with a directory-anchored overview step whenever " +
+  "the project has a meaningful directory structure. If the tour is scoped to a subdirectory, anchor " +
+  "that first step to the exact workspace-relative directory. Use additional directory-anchored steps " +
+  "to introduce major components before moving into detailed file anchors. " +
+  "Arguments: an optional title (defaults to \"Project Overview\"), an optional description, and a " +
+  "required non-empty steps array. Each step takes an optional title, a required Markdown description, " +
+  "and at most one locator: a file or a directory (workspace-relative paths). A step may also target a " +
+  "line, a unique stable pattern, or a selection, but only together with a file; line and pattern are " +
+  "mutually exclusive. Prefer a unique stable pattern over a line number so the anchor resists file " +
+  "evolution, and use a line only as a fallback. Steps without any locator are allowed for general " +
+  "context. Every anchor is " +
+  "validated against the real workspace state, and all validation errors are reported in a single " +
+  "response. On failure, the previous tour file is preserved. " +
+  MERMAID_TOOL_GUIDANCE;
+
+const CHANGES_TOUR_DESCRIPTION =
+  "Creates a CodeTour Changes Tour that explains the committed changes on the current branch since it " +
+  "diverged from a base ref, persisted at .tours/changes.tour (replacing any previously generated tour " +
+  "of the same kind). You provide the fully written content; the server only validates and persists it " +
+  "deterministically. A good Changes Tour ideally covers: the intent of the changes, the major " +
+  "modifications, their impact, and the relevant tests. " +
+  "Arguments: baseRef (required Git ref), headRef (required full 40-character SHA of the analyzed commit, " +
+  "which must equal the current HEAD), includeUncommittedChanges (optional boolean, default false), an optional " +
+  "title (defaults to \"Changes on <branch>\"), an optional description, and a required non-empty steps " +
+  "array. Steps follow the same rules as the Project Tour (prefer a unique stable pattern over a line " +
+  "number); steps may anchor unchanged files when they " +
+  "provide essential context, and deleted files must be explained with steps that have no locator. " +
+  "Uncommitted changes are excluded by default and reported as a warning; pass includeUncommittedChanges to " +
+  "include them explicitly. The description is automatically enriched with the base, merge-base and " +
+  "head. On failure, the previous tour file is preserved. " +
+  MERMAID_TOOL_GUIDANCE;
+
+const warningSchema = z.object({
+  code: z.string(),
+  message: z.string(),
+});
+const issueSchema = z.object({
+  path: z.string(),
+  message: z.string(),
+});
+const toolResultSchema = z.object({
+  status: z.enum(["created", "error"]),
+  path: z.string().optional(),
+  stepCount: z.number().int().nonnegative().optional(),
+  warnings: z.array(warningSchema).optional(),
+  code: z.string().optional(),
+  message: z.string().optional(),
+  issues: z.array(issueSchema).optional(),
+});
+
+const projectToolInputSchema = z
+  .object({
+    title: z.unknown().optional(),
+    description: z.unknown().optional(),
+    steps: z.unknown().optional(),
+  })
+  .passthrough();
+
+const changesToolInputSchema = z
+  .object({
+    title: z.unknown().optional(),
+    description: z.unknown().optional(),
+    steps: z.unknown().optional(),
+    baseRef: z.unknown().optional(),
+    headRef: z.unknown().optional(),
+    includeUncommittedChanges: z.unknown().optional(),
+  })
+  .passthrough();
+
+export function createServer(workspaceRoot: string): McpServer {
+  const ctx = createContext(workspaceRoot);
+  const server = new McpServer(
+    { name: SERVER_NAME, version: SERVER_VERSION },
+    { capabilities: { tools: {} } }
+  );
+
+  server.registerTool(
+    "create_project_tour",
+    {
+      description: PROJECT_TOUR_DESCRIPTION,
+      inputSchema: projectToolInputSchema,
+      outputSchema: toolResultSchema,
+    },
+    (args) => handleCreateProjectTour(ctx, args)
+  );
+
+  server.registerTool(
+    "create_changes_tour",
+    {
+      description: CHANGES_TOUR_DESCRIPTION,
+      inputSchema: changesToolInputSchema,
+      outputSchema: toolResultSchema,
+    },
+    (args) => handleCreateChangesTour(ctx, args)
+  );
+
+  return server;
+}
+
+// Produit la visite d'accueil du projet. Elle reste disponible quelle que soit
+// la branche ouverte, car elle présente le fonctionnement global du code et non
+// un instant particulier de son historique Git.
+async function handleCreateProjectTour(
+  ctx: WorkspaceContext,
+  args: unknown
+): Promise<ToolResponse> {
+  const rawSteps = extractSteps(args);
+  // La validation agrège toutes les erreurs (paramètres puis étapes) avant de
+  // répondre, pour permettre à l'agent de corriger la proposition en un cycle.
+  const { params, issues: paramIssues } = validateProjectParams(args);
+  const mermaidIssues = await validateMermaidDescriptions(args);
+  if (rawSteps === undefined || (Array.isArray(rawSteps) && rawSteps.length === 0)) {
+    if (mermaidIssues.length === 0) {
+      return errorResponse("TOUR_STEPS_REQUIRED", "A tour requires at least one step.");
+    }
+
+    return errorResponse(
+      "INVALID_PROPOSAL",
+      "The create_project_tour arguments are invalid.",
+      [
+        ...mermaidIssues,
+        { path: "steps", message: "is required and must contain at least one step" }
+      ]
+    );
+  }
+
+  const allIssues = [...paramIssues, ...mermaidIssues];
+  let steps: TourStep[] | undefined;
+  if (Array.isArray(rawSteps)) {
+    const validated = validateSteps(rawSteps, ctx);
+    steps = validated.steps;
+    allIssues.push(...validated.issues);
+  }
+  if (!params || allIssues.length > 0) {
+    return errorResponse(
+      "INVALID_PROPOSAL",
+      "The create_project_tour arguments are invalid.",
+      allIssues
+    );
+  }
+  const finalSteps = steps as TourStep[];
+
+  const warnings = stepLimitWarnings(finalSteps);
+
+  const tour: TourFile = {
+    $schema: CODETOUR_SCHEMA_URI,
+    title: params.title ?? "Project Overview",
+    ...(params.description !== undefined ? { description: params.description } : {}),
+    steps: finalSteps,
+  };
+
+  const writeFailure = await persistTour(ctx, PROJECT_TOUR_PATH, tour);
+  if (writeFailure) {
+    return writeFailure;
+  }
+
+  return successResponse(
+    PROJECT_TOUR_PATH,
+    finalSteps.length,
+    warnings,
+    `Created Project Tour at ${PROJECT_TOUR_PATH} with ${finalSteps.length} step(s).`
+  );
+}
+
+// Produit une visite de revue de branche. Le lecteur voit ce qui a changé
+// depuis la branche de référence ; si le code avance pendant la génération, la
+// visite est refusée pour ne jamais présenter une explication déjà obsolète.
+// Le travail local n'est inclus que lorsque l'appelant le demande explicitement.
+async function handleCreateChangesTour(
+  ctx: WorkspaceContext,
+  args: unknown
+): Promise<ToolResponse> {
+  const rawSteps = extractSteps(args);
+  // Même stratégie d'agrégation que pour le Project Tour : toutes les erreurs
+  // de validation sont collectées avant de répondre.
+  const { params, issues: paramIssues } = validateChangesParams(args);
+  const mermaidIssues = await validateMermaidDescriptions(args);
+  if (rawSteps === undefined || (Array.isArray(rawSteps) && rawSteps.length === 0)) {
+    if (mermaidIssues.length === 0) {
+      return errorResponse("TOUR_STEPS_REQUIRED", "A tour requires at least one step.");
+    }
+
+    return errorResponse(
+      "INVALID_PROPOSAL",
+      "The create_changes_tour arguments are invalid.",
+      [
+        ...mermaidIssues,
+        { path: "steps", message: "is required and must contain at least one step" }
+      ]
+    );
+  }
+
+  const allIssues = [...paramIssues, ...mermaidIssues];
+  let steps: TourStep[] | undefined;
+  if (Array.isArray(rawSteps)) {
+    const validated = validateSteps(rawSteps, ctx);
+    steps = validated.steps;
+    allIssues.push(...validated.issues);
+  }
+  if (!params || allIssues.length > 0) {
+    return errorResponse(
+      "INVALID_PROPOSAL",
+      "The create_changes_tour arguments are invalid.",
+      allIssues
+    );
+  }
+
+  const baseRef = params.baseRef as string;
+  const headRef = params.headRef as string;
+  const includeUncommittedChanges = params.includeUncommittedChanges === true;
+
+  // Le Changes Tour dépend de l'historique Git : hors dépôt, l'outil échoue.
+  if (!(await isGitRepository(ctx))) {
+    return errorResponse(
+      "GIT_REPOSITORY_REQUIRED",
+      "create_changes_tour requires a Git repository, but the workspace root is not inside one."
+    );
+  }
+
+  // Le SHA analysé doit correspondre exactement au HEAD courant : sinon
+  // l'explication risquerait de ne pas correspondre au snapshot relu.
+  const currentHead = await currentHeadSha(ctx);
+  if (currentHead === null) {
+    return errorResponse(
+      "STALE_HEAD",
+      "The repository has no commits, so there is no HEAD to analyze."
+    );
+  }
+  if (headRef !== currentHead) {
+    return errorResponse(
+      "STALE_HEAD",
+      `The provided headRef ${headRef} does not match the current HEAD (${currentHead}). The analysis is stale; re-run it against the current HEAD.`
+    );
+  }
+
+  let mergeBaseSha: string;
+  try {
+    mergeBaseSha = await mergeBase(ctx, baseRef, headRef);
+  } catch (error) {
+    return errorResponse(
+      "INVALID_BASE_REF",
+      `Unable to compute the merge-base between ${baseRef} and ${headRef}: ${(error as Error).message}`
+    );
+  }
+
+  // Sans aucun changement committé (et sans travail local inclus), l'outil
+  // répond NO_CHANGES et conserve l'ancien Changes Tour : une visite vide ne
+  // remplace jamais une visite utile.
+  const uncommitted = await uncommittedChanges(ctx);
+  if (
+    (await committedDiffIsEmpty(ctx, mergeBaseSha, headRef)) &&
+    (!includeUncommittedChanges || uncommitted.length === 0)
+  ) {
+    return errorResponse(
+      "NO_CHANGES",
+      `No committed changes between the merge-base of ${baseRef} (${mergeBaseSha}) and ${headRef}. The previous tour file was preserved.`
+    );
+  }
+
+  // Les changements non committés sont exclus par défaut (avertissement),
+  // ou inclus explicitement : le Tour n'a alors pas de `ref` et signale que
+  // le résultat décrit un état local non reproductible.
+  const warnings: Warning[] = [];
+  if (includeUncommittedChanges) {
+    warnings.push({
+      code: "UNCOMMITTED_CHANGES_INCLUDED",
+      message:
+        "Uncommitted changes were explicitly included; the tour describes a local state that is not reproducible from Git.",
+    });
+  } else if (uncommitted.length > 0) {
+    warnings.push({
+      code: "UNCOMMITTED_CHANGES_EXCLUDED",
+      message: `${uncommitted.length} uncommitted change(s) were excluded from the analysis (staged, unstaged or untracked).`,
+    });
+  }
+
+  const finalSteps = steps as TourStep[];
+  const warningsFromStepLimit = stepLimitWarnings(finalSteps);
+  warnings.push(...warningsFromStepLimit);
+
+  // Ensemble des fichiers modifiés (committés, plus les fichiers non committés
+  // lorsque includeUncommittedChanges est actif), utilisé pour l'avertissement
+  // NO_CHANGED_FILE_ANCHOR.
+  const changedInWorkspace = await changedFilesInWorkspace(ctx, mergeBaseSha, headRef);
+  if (includeUncommittedChanges) {
+    for (const entry of uncommitted) {
+      if (!changedInWorkspace.includes(entry.path)) {
+        changedInWorkspace.push(entry.path);
+      }
+    }
+  }
+  if (
+    changedInWorkspace.length > 0 &&
+    !finalSteps.some(
+      (step) =>
+        step.file !== undefined &&
+        changedInWorkspace.includes(normalizeSlashes(step.file))
+    )
+  ) {
+    warnings.push({
+      code: "NO_CHANGED_FILE_ANCHOR",
+      message:
+        "No step anchors a file modified by these changes; consider anchoring steps on changed files.",
+    });
+  }
+
+  const title = params.title ?? (await defaultChangesTitle(ctx, headRef));
+  // La description est enrichie automatiquement avec la provenance, la base et
+  // la tête, afin que le périmètre analysé soit toujours connu du lecteur.
+  const provenance = includeUncommittedChanges
+    ? `Generated from the merge-base of \`${baseRef}\` (\`${mergeBaseSha}\`) to \`${headRef}\`, including uncommitted changes (non-reproducible local state).`
+    : `Generated from the merge-base of \`${baseRef}\` (\`${mergeBaseSha}\`) to \`${headRef}\`.`;
+  const description =
+    params.description !== undefined
+      ? `${params.description}\n\n${provenance}`
+      : provenance;
+
+  const tour: TourFile = {
+    $schema: CODETOUR_SCHEMA_URI,
+    title,
+    description,
+    ...(!includeUncommittedChanges ? { ref: headRef } : {}),
+    steps: finalSteps,
+  };
+
+  // HEAD peut avancer pendant les lectures Git effectuées ci-dessus. Le relire
+  // au dernier moment empêche une analyse devenue obsolète de remplacer le
+  // Changes Tour précédent.
+  const headImmediatelyBeforePersistence = await currentHeadSha(ctx);
+  if (headImmediatelyBeforePersistence !== headRef) {
+    return errorResponse(
+      "STALE_HEAD",
+      headImmediatelyBeforePersistence === null
+        ? "The repository no longer has a HEAD to persist this analysis against. The previous tour file was preserved."
+        : `The provided head ${headRef} no longer matches the current HEAD (${headImmediatelyBeforePersistence}). The analysis became stale before persistence; re-run it against the current HEAD.`
+    );
+  }
+
+  const writeFailure = await persistTour(ctx, CHANGES_TOUR_PATH, tour);
+  if (writeFailure) {
+    return writeFailure;
+  }
+
+  return successResponse(
+    CHANGES_TOUR_PATH,
+    finalSteps.length,
+    warnings,
+    `Created Changes Tour at ${CHANGES_TOUR_PATH} with ${finalSteps.length} step(s) for head ${headRef} (base ${baseRef}).`
+  );
+}
+
+// Avertissement non bloquant lorsqu'un Tour dépasse quinze étapes.
+function stepLimitWarnings(steps: TourStep[]): Warning[] {
+  if (steps.length <= MAX_RECOMMENDED_STEPS) {
+    return [];
+  }
+  return [
+    {
+      code: "STEP_LIMIT_EXCEEDED",
+      message: `The tour has ${steps.length} steps; the recommended maximum is ${MAX_RECOMMENDED_STEPS}.`,
+    },
+  ];
+}
+
+// Valide le Tour produit contre le schéma CodeTour général, puis l'écrit de
+// façon atomique. En cas d'échec, l'ancien fichier reste intact.
+async function persistTour(
+  ctx: WorkspaceContext,
+  relativePath: string,
+  tour: TourFile
+): Promise<ToolResponse | null> {
+  const schemaResult = validateCodetourTour(tour);
+  if (!schemaResult) {
+    return errorResponse(
+      "SCHEMA_VALIDATION_FAILED",
+      "The generated tour did not validate against the CodeTour schema.",
+      []
+    );
+  }
+  try {
+    await writeTourAtomic(ctx, relativePath, serializeTour(tour));
+  } catch (error) {
+    if (error instanceof OutputPathError) {
+      return errorResponse("OUTPUT_PATH_ESCAPES_WORKSPACE", error.message);
+    }
+    throw error;
+  }
+  return null;
+}
+
+function extractSteps(args: unknown): unknown {
+  if (typeof args !== "object" || args === null || Array.isArray(args)) {
+    return undefined;
+  }
+  return (args as Record<string, unknown>).steps;
+}
+
+// Fichiers modifiés par le diff committé, convertis en chemins relatifs au
+// workspace (le workspace peut être un sous-répertoire du dépôt).
+async function changedFilesInWorkspace(
+  ctx: WorkspaceContext,
+  mergeBaseSha: string,
+  headRef: string
+): Promise<string[]> {
+  const files = await changedFiles(ctx, mergeBaseSha, headRef);
+  const prefix = normalizeSlashes(await workspacePrefix(ctx));
+  return files
+    .map(normalizeSlashes)
+    .filter((file) => file.startsWith(prefix))
+    .map((file) => file.slice(prefix.length));
+}
+
+// Titre par défaut du Changes Tour : « Changes on <branche> », avec un
+// repli sur le SHA court lorsque HEAD est détaché.
+async function defaultChangesTitle(
+  ctx: WorkspaceContext,
+  headRef: string
+): Promise<string> {
+  const branch = await currentBranchName(ctx);
+  if (branch && branch !== "HEAD") {
+    return `Changes on ${branch}`;
+  }
+  return `Changes at ${headRef.slice(0, 7)}`;
+}
+
+function serializeTour(tour: TourFile): string {
+  return JSON.stringify(tour, null, 2) + "\n";
+}
+
+interface ToolResponse {
+  [key: string]: unknown;
+  content: { type: "text"; text: string }[];
+  structuredContent: Record<string, unknown>;
+  isError?: boolean;
+}
+
+function successResponse(
+  relativePath: string,
+  stepCount: number,
+  warnings: Warning[],
+  message: string
+): ToolResponse {
+  const result: SuccessResult = {
+    status: "created",
+    path: relativePath,
+    stepCount,
+    warnings,
+  };
+  const text = [
+    message,
+    ...warnings.map((warning) => `Warning (${warning.code}): ${warning.message}`),
+  ].join("\n");
+  return {
+    content: [{ type: "text", text }],
+    structuredContent: result as unknown as Record<string, unknown>,
+  };
+}
+
+function errorResponse(
+  code: string,
+  message: string,
+  issues?: Issue[]
+): ToolResponse {
+  const result: ErrorResult = {
+    status: "error",
+    code,
+    message,
+    ...(issues && issues.length > 0 ? { issues } : {}),
+  };
+  const text =
+    issues && issues.length > 0
+      ? `Error (${code}): ${message}\n` +
+        issues.map((issue) => `- ${issue.path}: ${issue.message}`).join("\n")
+      : `Error (${code}): ${message}`;
+  return {
+    content: [{ type: "text", text }],
+    structuredContent: result as unknown as Record<string, unknown>,
+    isError: true,
+  };
+}
diff --git a/packages/mcp-server/src/types.ts b/packages/mcp-server/src/types.ts
new file mode 100644
index 00000000..c66367a6
--- /dev/null
+++ b/packages/mcp-server/src/types.ts
@@ -0,0 +1,70 @@
+export interface Position {
+  line: number;
+  character: number;
+}
+
+export interface Selection {
+  start: Position;
+  end: Position;
+}
+
+export interface TourStep {
+  title?: string;
+  description: string;
+  file?: string;
+  directory?: string;
+  line?: number;
+  pattern?: string;
+  selection?: Selection;
+}
+
+export interface ProjectParams {
+  title?: string;
+  description?: string;
+  steps?: unknown[];
+}
+
+export interface ChangesParams extends ProjectParams {
+  baseRef?: string;
+  headRef?: string;
+  includeUncommittedChanges?: boolean;
+}
+
+export interface TourFile {
+  $schema?: string;
+  title: string;
+  description?: string;
+  ref?: string;
+  steps: TourStep[];
+}
+
+export interface Issue {
+  path: string;
+  message: string;
+}
+
+export interface Warning {
+  code: string;
+  message: string;
+}
+
+export interface SuccessResult {
+  status: "created";
+  path: string;
+  stepCount: number;
+  warnings: Warning[];
+}
+
+export interface ErrorResult {
+  status: "error";
+  code: string;
+  message: string;
+  issues?: Issue[];
+}
+
+export type ToolResult = SuccessResult | ErrorResult;
+
+export interface WorkspaceContext {
+  root: string;
+  realRoot: string;
+}
diff --git a/packages/mcp-server/src/validation.ts b/packages/mcp-server/src/validation.ts
new file mode 100644
index 00000000..63b4f425
--- /dev/null
+++ b/packages/mcp-server/src/validation.ts
@@ -0,0 +1,498 @@
+import * as fs from "fs";
+import * as path from "path";
+import {
+  ChangesParams,
+  Issue,
+  Position,
+  ProjectParams,
+  Selection,
+  TourStep,
+  WorkspaceContext,
+} from "./types";
+
+// Moteur de validation déterministe des propositions de Tours.
+//
+// Toute erreur détectée est agrégée dans une liste d'`Issue` (chemin + message)
+// avant de répondre, afin que l'agent corrige la proposition en un seul cycle.
+// Une étape peut être purement explicative (sans Tour Anchor) ; lorsqu'elle
+// possède un localisateur, celui-ci est validé contre l'état réel du workspace
+// (existence, bornes de lignes/sélections, unicité du motif, confinement des
+// liens symboliques à la racine configurée).
+
+export const STEP_FIELDS = [
+  "title",
+  "description",
+  "file",
+  "directory",
+  "line",
+  "pattern",
+  "selection",
+] as const;
+
+export const MAX_RECOMMENDED_STEPS = 15;
+
+// Schémas d'URI actifs refusés dans le Markdown : une description générée ne
+// doit pas pouvoir déclencher une action dans l'éditeur ou le terminal.
+const FORBIDDEN_URI_SCHEME =
+  /(?:command|file|vscode|vscode-insiders|javascript):/i;
+
+const FULL_SHA_PATTERN = /^[0-9a-f]{40}$/;
+
+type RawObject = Record<string, unknown>;
+
+function isPlainObject(value: unknown): value is RawObject {
+  return typeof value === "object" && value !== null && !Array.isArray(value);
+}
+
+function isPositiveInteger(value: unknown): value is number {
+  return typeof value === "number" && Number.isInteger(value) && value > 0;
+}
+
+function isOptionalString(
+  raw: RawObject,
+  key: string,
+  errorPath: string,
+  issues: Issue[]
+): string | undefined {
+  const value = raw[key];
+  if (value === undefined) {
+    return undefined;
+  }
+  if (typeof value !== "string") {
+    issues.push({ path: errorPath, message: "must be a string" });
+    return undefined;
+  }
+  return value;
+}
+
+function reportUnknownFields(
+  raw: RawObject,
+  allowed: readonly string[],
+  errorPath: string,
+  issues: Issue[]
+): void {
+  for (const key of Object.keys(raw)) {
+    if (!allowed.includes(key)) {
+      issues.push({
+        path: errorPath === "$" ? key : `${errorPath}.${key}`,
+        message:
+          "unknown field (V1 tours only allow title, description, file, directory, line, pattern and selection)",
+      });
+    }
+  }
+}
+
+const PROJECT_PARAM_FIELDS = ["title", "description", "steps"] as const;
+const CHANGES_PARAM_FIELDS = [
+  "title",
+  "description",
+  "steps",
+  "baseRef",
+  "headRef",
+  "includeUncommittedChanges",
+] as const;
+
+export function validateProjectParams(
+  raw: unknown
+): { params?: ProjectParams; issues: Issue[] } {
+  const issues: Issue[] = [];
+  if (!isPlainObject(raw)) {
+    issues.push({ path: "$", message: "the arguments must be an object" });
+    return { issues };
+  }
+  // Le schéma d'entrée V1 est strict : tout champ inconnu est refusé, ce qui
+  // exclut notamment `when`, `commands`, `uri` et les capacités de V2.
+  reportUnknownFields(raw, PROJECT_PARAM_FIELDS, "$", issues);
+  const params = validateCommonParams(raw, issues);
+  return { params, issues };
+}
+
+export function validateChangesParams(
+  raw: unknown
+): { params?: ChangesParams; issues: Issue[] } {
+  const issues: Issue[] = [];
+  if (!isPlainObject(raw)) {
+    issues.push({ path: "$", message: "the arguments must be an object" });
+    return { issues };
+  }
+  reportUnknownFields(raw, CHANGES_PARAM_FIELDS, "$", issues);
+  const params = validateCommonParams(raw, issues) as ChangesParams;
+  if (typeof raw.baseRef !== "string" || raw.baseRef.trim() === "") {
+    issues.push({ path: "baseRef", message: "is required and must be a non-empty string" });
+  } else {
+    params.baseRef = raw.baseRef;
+  }
+  if (typeof raw.headRef !== "string") {
+    issues.push({ path: "headRef", message: "is required and must be the full 40-character commit SHA" });
+  } else if (!FULL_SHA_PATTERN.test(raw.headRef)) {
+    issues.push({ path: "headRef", message: "must be the full 40-character commit SHA" });
+  } else {
+    params.headRef = raw.headRef;
+  }
+  if (raw.includeUncommittedChanges !== undefined) {
+    if (typeof raw.includeUncommittedChanges !== "boolean") {
+      issues.push({ path: "includeUncommittedChanges", message: "must be a boolean" });
+    } else {
+      params.includeUncommittedChanges = raw.includeUncommittedChanges;
+    }
+  }
+  return { params, issues };
+}
+
+// Champs communs aux deux outils : titre optionnel, description optionnelle
+// (avec filtrage des schémas d'URI actifs) et liste d'étapes obligatoire.
+function validateCommonParams(raw: RawObject, issues: Issue[]): ProjectParams {
+  const params: ProjectParams = {};
+  const title = isOptionalString(raw, "title", "title", issues);
+  if (title !== undefined) {
+    params.title = title;
+  }
+  const description = isOptionalString(raw, "description", "description", issues);
+  if (description !== undefined) {
+    if (FORBIDDEN_URI_SCHEME.test(description)) {
+      issues.push({
+        path: "description",
+        message:
+          "contains a forbidden URI scheme (command:, file:, vscode:, vscode-insiders:, javascript:)",
+      });
+    }
+    params.description = description;
+  }
+  if (raw.steps === undefined) {
+    issues.push({ path: "steps", message: "is required" });
+  } else if (!Array.isArray(raw.steps)) {
+    issues.push({ path: "steps", message: "must be an array" });
+  } else {
+    params.steps = raw.steps;
+  }
+  return params;
+}
+
+export function validateSteps(
+  rawSteps: unknown[],
+  ctx: WorkspaceContext
+): { steps?: TourStep[]; issues: Issue[] } {
+  const allIssues: Issue[] = [];
+  const steps: TourStep[] = [];
+  for (let index = 0; index < rawSteps.length; index++) {
+    const { step, issues } = validateStep(rawSteps[index], index, ctx);
+    allIssues.push(...issues);
+    if (step) {
+      steps.push(step);
+    }
+  }
+  if (allIssues.length > 0) {
+    return { issues: allIssues };
+  }
+  return { steps, issues: [] };
+}
+
+// Valide chaque étape contre les règles de Tour Anchor :
+// - au plus un localisateur principal (fichier ou répertoire) ;
+// - ligne, motif et sélection ne sont valides qu'avec un fichier ;
+// - ligne et motif sont mutuellement exclusifs ;
+// - le motif doit identifier une occurrence unique dans le fichier ;
+// - les bornes de ligne et de sélection sont vérifiées contre le contenu réel.
+function validateStep(
+  raw: unknown,
+  index: number,
+  ctx: WorkspaceContext
+): { step?: TourStep; issues: Issue[] } {
+  const issues: Issue[] = [];
+  const base = `steps[${index}]`;
+  if (!isPlainObject(raw)) {
+    issues.push({ path: base, message: "must be an object" });
+    return { issues };
+  }
+  reportUnknownFields(raw, STEP_FIELDS, base, issues);
+
+  const description = isOptionalString(raw, "description", `${base}.description`, issues);
+  if (description === undefined && raw.description === undefined) {
+    issues.push({ path: `${base}.description`, message: "is required and must be a string" });
+  }
+
+  const title = isOptionalString(raw, "title", `${base}.title`, issues);
+
+  const file = isOptionalString(raw, "file", `${base}.file`, issues);
+  const directory = isOptionalString(raw, "directory", `${base}.directory`, issues);
+
+  if (file !== undefined && directory !== undefined) {
+    issues.push({ path: base, message: "a step cannot have both a file and a directory" });
+  }
+
+  let line: number | undefined;
+  if (raw.line !== undefined) {
+    if (!isPositiveInteger(raw.line)) {
+      issues.push({ path: `${base}.line`, message: "must be a positive integer" });
+    } else {
+      line = raw.line;
+    }
+    if (file === undefined) {
+      issues.push({ path: `${base}.line`, message: "is only valid together with a file" });
+    }
+  }
+
+  let pattern: string | undefined;
+  if (raw.pattern !== undefined) {
+    if (typeof raw.pattern !== "string") {
+      issues.push({ path: `${base}.pattern`, message: "must be a string" });
+    } else {
+      pattern = raw.pattern;
+    }
+    if (file === undefined) {
+      issues.push({ path: `${base}.pattern`, message: "is only valid together with a file" });
+    }
+  }
+
+  if (line !== undefined && pattern !== undefined) {
+    issues.push({ path: base, message: "line and pattern are mutually exclusive" });
+  }
+
+  let selection: Selection | undefined;
+  if (raw.selection !== undefined) {
+    selection = validateSelection(raw.selection, `${base}.selection`, issues);
+    if (file === undefined) {
+      issues.push({ path: `${base}.selection`, message: "is only valid together with a file" });
+    }
+  }
+
+  // Le Markdown d'une étape ne peut contenir que des liens et images HTTPS
+  // ordinaires ; les schémas actifs sont refusés.
+  if (description !== undefined && FORBIDDEN_URI_SCHEME.test(description)) {
+    issues.push({
+      path: `${base}.description`,
+      message:
+        "contains a forbidden URI scheme (command:, file:, vscode:, vscode-insiders:, javascript:)",
+    });
+  }
+
+  // Résolution du chemin réel de l'ancre : une lecture n'a lieu qu'après
+  // vérification du confinement au workspace.
+  let fileContent: string | undefined;
+  let fileAnchorOk = true;
+  if (file !== undefined) {
+    const anchor = checkAnchor(ctx, file, "file", `${base}.file`, issues);
+    if (anchor.ok && anchor.realPath !== undefined) {
+      try {
+        fileContent = fs.readFileSync(anchor.realPath, "utf8");
+      } catch {
+        issues.push({ path: `${base}.file`, message: "could not be read" });
+      }
+    }
+    fileAnchorOk = anchor.ok;
+  }
+  if (directory !== undefined) {
+    checkAnchor(ctx, directory, "directory", `${base}.directory`, issues);
+  }
+
+  if (fileContent === undefined && !fileAnchorOk) {
+    for (const field of ["line", "pattern", "selection"] as const) {
+      if (raw[field] !== undefined) {
+        issues.push({
+          path: `${base}.${field}`,
+          message: "cannot be validated because the file anchor is invalid",
+        });
+      }
+    }
+  }
+
+  if (line !== undefined && fileContent !== undefined) {
+    const lineCount = fileContent.split("\n").length;
+    if (line > lineCount) {
+      issues.push({
+        path: `${base}.line`,
+        message: `is out of range: the file has ${lineCount} line(s)`,
+      });
+    }
+  }
+
+  if (pattern !== undefined && fileContent !== undefined) {
+    let regex: RegExp;
+    try {
+      regex = new RegExp(pattern);
+    } catch (error) {
+      issues.push({
+        path: `${base}.pattern`,
+        message: `is not a valid regular expression: ${(error as Error).message}`,
+      });
+      regex = undefined as unknown as RegExp;
+    }
+    if (regex) {
+      const matches = fileContent.match(new RegExp(regex.source, "g")) ?? [];
+      if (matches.length !== 1) {
+        issues.push({
+          path: `${base}.pattern`,
+          message: `must match exactly one occurrence in the file (matched ${matches.length})`,
+        });
+      }
+    }
+  }
+
+  if (selection && fileContent !== undefined) {
+    validateSelectionBounds(selection, fileContent, base, issues);
+  }
+
+  if (issues.length > 0) {
+    return { issues };
+  }
+  return {
+    step: {
+      title,
+      description: description as string,
+      file,
+      directory,
+      line,
+      pattern,
+      selection,
+    },
+    issues: [],
+  };
+}
+
+function validateSelection(
+  raw: unknown,
+  base: string,
+  issues: Issue[]
+): Selection | undefined {
+  if (!isPlainObject(raw)) {
+    issues.push({ path: base, message: "must be an object with start and end" });
+    return undefined;
+  }
+  reportUnknownFields(raw, ["start", "end"], base, issues);
+  const start = validatePosition(raw.start, `${base}.start`, issues);
+  const end = validatePosition(raw.end, `${base}.end`, issues);
+  if (!start || !end) {
+    return undefined;
+  }
+  if (
+    start.line > end.line ||
+    (start.line === end.line && start.character > end.character)
+  ) {
+    issues.push({ path: base, message: "the start position must be before the end position" });
+    return undefined;
+  }
+  return { start, end };
+}
+
+function validatePosition(
+  raw: unknown,
+  base: string,
+  issues: Issue[]
+): Position | undefined {
+  if (!isPlainObject(raw)) {
+    issues.push({ path: base, message: "must be an object with line and character" });
+    return undefined;
+  }
+  reportUnknownFields(raw, ["line", "character"], base, issues);
+  let line: number | undefined;
+  if (!isPositiveInteger(raw.line)) {
+    issues.push({ path: `${base}.line`, message: "is required and must be a positive integer" });
+  } else {
+    line = raw.line;
+  }
+  let character: number | undefined;
+  if (!isPositiveInteger(raw.character)) {
+    issues.push({ path: `${base}.character`, message: "is required and must be a positive integer" });
+  } else {
+    character = raw.character;
+  }
+  if (line === undefined || character === undefined) {
+    return undefined;
+  }
+  return { line, character };
+}
+
+function validateSelectionBounds(
+  selection: Selection,
+  fileContent: string,
+  base: string,
+  issues: Issue[]
+): void {
+  const lines = fileContent.split("\n");
+  const maxLine = lines.length;
+  if (selection.start.line > maxLine) {
+    issues.push({
+      path: `${base}.selection.start.line`,
+      message: `is out of range: the file has ${maxLine} line(s)`,
+    });
+  } else {
+    const maxCharacter = lines[selection.start.line - 1].length + 1;
+    if (selection.start.character > maxCharacter) {
+      issues.push({
+        path: `${base}.selection.start.character`,
+        message: `is out of range: line ${selection.start.line} has ${maxCharacter} character slot(s)`,
+      });
+    }
+  }
+  if (selection.end.line > maxLine) {
+    issues.push({
+      path: `${base}.selection.end.line`,
+      message: `is out of range: the file has ${maxLine} line(s)`,
+    });
+  } else {
+    const maxCharacter = lines[selection.end.line - 1].length + 1;
+    if (selection.end.character > maxCharacter) {
+      issues.push({
+        path: `${base}.selection.end.character`,
+        message: `is out of range: line ${selection.end.line} has ${maxCharacter} character slot(s)`,
+      });
+    }
+  }
+}
+
+interface AnchorResult {
+  ok: boolean;
+  realPath?: string;
+}
+
+// Vérifie qu'une ancre (fichier ou répertoire) existe réellement et reste
+// confinée au workspace : le chemin réel est résolu avant toute lecture, et un
+// lien symbolique qui sort de la racine configurée est refusé.
+function checkAnchor(
+  ctx: WorkspaceContext,
+  value: string,
+  kind: "file" | "directory",
+  errorPath: string,
+  issues: Issue[]
+): AnchorResult {
+  if (value.trim() === "") {
+    issues.push({ path: errorPath, message: "must not be empty" });
+    return { ok: false };
+  }
+  if (path.isAbsolute(value)) {
+    issues.push({ path: errorPath, message: "must be relative to the workspace root" });
+    return { ok: false };
+  }
+  const target = path.resolve(ctx.root, value);
+  let realPath: string;
+  try {
+    realPath = fs.realpathSync(target);
+  } catch {
+    issues.push({ path: errorPath, message: "does not exist in the workspace" });
+    return { ok: false };
+  }
+  const relative = path.relative(ctx.realRoot, realPath);
+  if (relative.startsWith("..") || path.isAbsolute(relative)) {
+    issues.push({
+      path: errorPath,
+      message: "resolves outside the workspace root (symlinks escaping the workspace are not allowed)",
+    });
+    return { ok: false };
+  }
+  let stat: fs.Stats;
+  try {
+    stat = fs.statSync(realPath);
+  } catch {
+    issues.push({ path: errorPath, message: "does not exist in the workspace" });
+    return { ok: false };
+  }
+  if (kind === "file" && !stat.isFile()) {
+    issues.push({ path: errorPath, message: "is not a file" });
+    return { ok: false };
+  }
+  if (kind === "directory" && !stat.isDirectory()) {
+    issues.push({ path: errorPath, message: "is not a directory" });
+    return { ok: false };
+  }
+  return { ok: true, realPath };
+}
diff --git a/packages/mcp-server/test/helpers/mermaid-fixtures.ts b/packages/mcp-server/test/helpers/mermaid-fixtures.ts
new file mode 100644
index 00000000..f2d78860
--- /dev/null
+++ b/packages/mcp-server/test/helpers/mermaid-fixtures.ts
@@ -0,0 +1,23 @@
+export const ALLOWED_DIAGRAM_SOURCES: Record<string, string> = {
+  flowchart: "flowchart TD\n    A --> B",
+  sequenceDiagram: "sequenceDiagram\n    A->>B: Hello",
+  "stateDiagram-v2": "stateDiagram-v2\n    [*] --> Idle",
+  classDiagram: "classDiagram\n    class Account {\n      +String id\n    }",
+  erDiagram: "erDiagram\n    CUSTOMER ||--o{ ORDER : places",
+};
+
+export function captionedDiagram(caption: string, source: string): string {
+  return [`**Diagram — ${caption}**`, "", "```mermaid", source, "```"].join(
+    "\n"
+  );
+}
+
+export function oversizedFlowchartSource(): string {
+  const prefix = "flowchart TD\n    A --> B\n%%";
+  return prefix + "x".repeat(20 * 1024 + 1 - Buffer.byteLength(prefix, "utf8"));
+}
+
+export const INVALID_FLOWCHART_SOURCE = [
+  "flowchart TD",
+  "    this is not mermaid at all (((",
+].join("\n");
diff --git a/packages/mcp-server/test/helpers/test-utils.ts b/packages/mcp-server/test/helpers/test-utils.ts
new file mode 100644
index 00000000..da1ee1cb
--- /dev/null
+++ b/packages/mcp-server/test/helpers/test-utils.ts
@@ -0,0 +1,160 @@
+import { Client } from "@modelcontextprotocol/sdk/client/index.js";
+import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js";
+import * as fs from "fs";
+import * as os from "os";
+import * as path from "path";
+import { validateCodetourTour } from "../../src/codetour-schema";
+import { git } from "../../src/git";
+
+export { git };
+
+export const CLI_PATH = path.join(__dirname, "..", "..", "src", "cli.js");
+
+export interface ToolResponse {
+  isError: boolean;
+  text: string;
+  structured: Record<string, unknown>;
+}
+
+export async function startServer(
+  workspaceRoot: string,
+  envOverrides: Record<string, string> = {}
+): Promise<Client> {
+  const client = new Client(
+    { name: "codetour-mcp-test-client", version: "0.0.0" },
+    { capabilities: {} }
+  );
+  const transport = new StdioClientTransport({
+    command: process.execPath,
+    args: [CLI_PATH],
+    cwd: workspaceRoot,
+    env: {
+      ...Object.fromEntries(
+        Object.entries(process.env).filter(
+          (entry): entry is [string, string] => entry[1] !== undefined
+        )
+      ),
+      ...envOverrides,
+    },
+  });
+  await client.connect(transport);
+  return client;
+}
+
+export async function withServer<T>(
+  root: string,
+  run: (client: Client) => Promise<T>,
+  envOverrides: Record<string, string> = {}
+): Promise<T> {
+  const client = await startServer(root, envOverrides);
+  try {
+    return await run(client);
+  } finally {
+    await stopServer(client);
+  }
+}
+
+export async function callTool(
+  client: Client,
+  name: string,
+  args: unknown
+): Promise<ToolResponse> {
+  const result = (await client.callTool({
+    name,
+    arguments: args as Record<string, unknown>,
+  })) as unknown as {
+    content?: Array<{ type: string; text?: string }>;
+    isError?: boolean;
+    structuredContent?: Record<string, unknown>;
+  };
+  const text = (result.content ?? [])
+    .filter((item) => item.type === "text" && item.text !== undefined)
+    .map((item) => item.text as string)
+    .join("\n");
+  return {
+    isError: result.isError ?? false,
+    text,
+    structured: result.structuredContent ?? {},
+  };
+}
+
+export async function stopServer(client: Client): Promise<void> {
+  await client.close();
+}
+
+export function tempDir(prefix = "codetour-mcp-test-"): string {
+  return fs.mkdtempSync(path.join(os.tmpdir(), prefix));
+}
+
+export function rmrf(dir: string): void {
+  fs.rmSync(dir, { recursive: true, force: true });
+}
+
+export function writeFile(workspaceRoot: string, relativePath: string, content: string): void {
+  const target = path.join(workspaceRoot, relativePath);
+  fs.mkdirSync(path.dirname(target), { recursive: true });
+  fs.writeFileSync(target, content);
+}
+
+export async function initGitRepo(dir: string, branch = "main"): Promise<void> {
+  await git(["init", "-b", branch], dir);
+  await git(["config", "user.email", "test@example.com"], dir);
+  await git(["config", "user.name", "Test User"], dir);
+  await git(["config", "commit.gpgsign", "false"], dir);
+  await git(["config", "tag.gpgsign", "false"], dir);
+}
+
+export async function commitFile(
+  dir: string,
+  relativePath: string,
+  content: string,
+  message: string
+): Promise<void> {
+  const target = path.join(dir, relativePath);
+  fs.mkdirSync(path.dirname(target), { recursive: true });
+  fs.writeFileSync(target, content);
+  await git(["add", "-A"], dir);
+  await git(["commit", "-m", message], dir);
+}
+
+export async function headSha(dir: string): Promise<string> {
+  const result = await git(["rev-parse", "HEAD"], dir);
+  return result.stdout.trim();
+}
+
+export function readTourFile(
+  workspaceRoot: string,
+  relativePath: string
+): Record<string, unknown> {
+  return JSON.parse(
+    fs.readFileSync(path.join(workspaceRoot, relativePath), "utf8")
+  );
+}
+
+export function tourFileValidAgainstSchema(
+  workspaceRoot: string,
+  relativePath: string
+): boolean {
+  const content = readTourFile(workspaceRoot, relativePath);
+  return validateCodetourTour(content) as boolean;
+}
+
+export function structuredCode(response: ToolResponse): string {
+  return (response.structured.code ?? "") as string;
+}
+
+export function structuredIssues(response: ToolResponse): Array<{ path: string; message: string }> {
+  return (response.structured.issues ?? []) as Array<{ path: string; message: string }>;
+}
+
+export function structuredWarnings(response: ToolResponse): Array<{ code: string; message: string }> {
+  return (response.structured.warnings ?? []) as Array<{ code: string; message: string }>;
+}
+
+export function warningCodes(response: ToolResponse): string[] {
+  return structuredWarnings(response).map((warning) => warning.code);
+}
+
+export function issuePaths(response: ToolResponse): string[] {
+  return structuredIssues(response).map((issue) => issue.path);
+}
diff --git a/packages/mcp-server/test/integration/changes-tour.test.ts b/packages/mcp-server/test/integration/changes-tour.test.ts
new file mode 100644
index 00000000..88623434
--- /dev/null
+++ b/packages/mcp-server/test/integration/changes-tour.test.ts
@@ -0,0 +1,684 @@
+import { test } from "node:test";
+import * as assert from "node:assert";
+import * as fs from "node:fs";
+import * as path from "node:path";
+import {
+  callTool,
+  commitFile,
+  git,
+  headSha,
+  initGitRepo,
+  readTourFile,
+  rmrf,
+  structuredCode,
+  tempDir,
+  tourFileValidAgainstSchema,
+  warningCodes,
+  withServer,
+  writeFile,
+} from "../helpers/test-utils";
+import {
+  ALLOWED_DIAGRAM_SOURCES,
+  INVALID_FLOWCHART_SOURCE,
+  captionedDiagram,
+} from "../helpers/mermaid-fixtures";
+
+async function setupRepo(): Promise<{ root: string; baseSha: string; head: string }> {
+  const root = tempDir();
+  await initGitRepo(root);
+  await commitFile(root, "base.txt", "base content\n", "add base file");
+  const baseSha = await headSha(root);
+  await git(["checkout", "-b", "feature"], root);
+  await commitFile(root, "feature.txt", "feature content\n", "add feature file");
+  const head = await headSha(root);
+  return { root, baseSha, head };
+}
+
+test("accepts all five allowed Mermaid kinds in a Changes Tour", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: Object.entries(ALLOWED_DIAGRAM_SOURCES).map(([kind, source]) => ({
+          description: captionedDiagram(`${kind} change`, source),
+        })),
+      });
+      assert.equal(response.isError, false, response.text);
+      assert.equal(response.structured.stepCount, 5);
+    });
+    assert.ok(tourFileValidAgainstSchema(root, ".tours/changes.tour"));
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("preserves the previous Changes Tour when Mermaid syntax is invalid", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    await withServer(root, async (client) => {
+      const first = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: [{ description: "Original.", file: "feature.txt" }],
+      });
+      assert.equal(first.isError, false);
+      const before = readTourFile(root, ".tours/changes.tour");
+
+      const second = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: [
+          {
+            description: captionedDiagram("Broken", INVALID_FLOWCHART_SOURCE),
+          },
+        ],
+      });
+      assert.equal(second.isError, true);
+      assert.equal(structuredCode(second), "INVALID_PROPOSAL");
+      assert.deepEqual(readTourFile(root, ".tours/changes.tour"), before);
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("creates a changes tour with the exact head SHA as ref", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        description: "Explains the feature branch.",
+        steps: [
+          { description: "Intent of the change." },
+          { description: "The new file.", file: "feature.txt", line: 1 },
+        ],
+      });
+      assert.equal(response.isError, false);
+      assert.equal(response.structured.status, "created");
+      assert.equal(response.structured.path, ".tours/changes.tour");
+      assert.equal(response.structured.stepCount, 2);
+      assert.deepEqual(response.structured.warnings, []);
+    });
+    const tour = readTourFile(root, ".tours/changes.tour");
+    assert.equal(tour.ref, head);
+    assert.equal(tour.title, "Changes on feature");
+    const description = tour.description as string;
+    assert.ok(description.includes("Explains the feature branch."));
+    assert.ok(description.includes(baseSha));
+    assert.ok(description.includes(head));
+    assert.ok(tourFileValidAgainstSchema(root, ".tours/changes.tour"));
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("uses the provided title when given", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        title: "Custom Title",
+        steps: [{ description: "d", file: "feature.txt" }],
+      });
+      assert.equal(response.isError, false);
+    });
+    assert.equal(readTourFile(root, ".tours/changes.tour").title, "Custom Title");
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("fails with STALE_HEAD when HEAD moved since the analysis", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    await commitFile(root, "extra.txt", "extra\n", "extra commit");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: [{ description: "d" }],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "STALE_HEAD");
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test(
+  "preserves the previous tour when HEAD moves immediately before persistence",
+  {
+    skip:
+      process.platform === "win32" &&
+      "the deterministic Git interception uses POSIX process semantics",
+  },
+  async () => {
+  const { root, baseSha, head } = await setupRepo();
+  const shimDir = tempDir("codetour-git-shim-");
+  const reachedFinalCheck = path.join(shimDir, "reached-final-check");
+  const continueRequest = path.join(shimDir, "continue-request");
+  const gitExecutable = process.platform === "win32" ? "git.exe" : "git";
+  const realGit = (process.env.PATH ?? "")
+    .split(path.delimiter)
+    .map((directory) => path.join(directory, gitExecutable))
+    .find((candidate) => fs.existsSync(candidate));
+  assert.ok(realGit, "git must be available on PATH");
+  const gitShim = path.join(
+    shimDir,
+    process.platform === "win32" ? "git.cmd" : "git"
+  );
+  writeFile(
+    shimDir,
+    path.basename(gitShim),
+    process.platform === "win32"
+      ? `@echo off
+if not "%*" == "rev-parse --abbrev-ref HEAD" goto run
+type nul > "${reachedFinalCheck}"
+:wait
+if exist "${continueRequest}" goto run
+ping -n 1 -w 10 127.0.0.1 > nul
+goto wait
+:run
+"${realGit}" %*
+`
+      : `#!/bin/sh
+if [ "$*" = "rev-parse --abbrev-ref HEAD" ]; then
+  : > "${reachedFinalCheck}"
+  while [ ! -e "${continueRequest}" ]; do sleep 0.01; done
+fi
+exec "${realGit}" "$@"
+`
+  );
+  if (process.platform !== "win32") {
+    fs.chmodSync(gitShim, 0o755);
+  }
+
+  try {
+    writeFile(root, ".tours/changes.tour", JSON.stringify({ title: "Previous tour" }));
+    const before = readTourFile(root, ".tours/changes.tour");
+
+    await withServer(
+      root,
+      async (client) => {
+        const request = callTool(client, "create_changes_tour", {
+          baseRef: baseSha,
+          headRef: head,
+          steps: [{ description: "Should not land.", file: "feature.txt" }],
+        });
+        while (!fs.existsSync(reachedFinalCheck)) {
+          await new Promise((resolve) => setTimeout(resolve, 10));
+        }
+        await commitFile(root, "late.txt", "late change\n", "move HEAD during request");
+        writeFile(shimDir, "continue-request", "continue\n");
+
+        const response = await request;
+        assert.equal(response.isError, true);
+        assert.equal(structuredCode(response), "STALE_HEAD");
+      },
+      { PATH: `${shimDir}:${process.env.PATH ?? ""}` }
+    );
+    assert.deepEqual(readTourFile(root, ".tours/changes.tour"), before);
+  } finally {
+    rmrf(root);
+    rmrf(shimDir);
+  }
+  }
+);
+
+test("fails with STALE_HEAD when headRef is not the current HEAD", async () => {
+  const { root, baseSha } = await setupRepo();
+  try {
+    const other = baseSha;
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: other,
+        steps: [{ description: "d" }],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "STALE_HEAD");
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("fails with GIT_REPOSITORY_REQUIRED outside a git repository", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: "main",
+        headRef: "a".repeat(40),
+        steps: [{ description: "d" }],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "GIT_REPOSITORY_REQUIRED");
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("fails with NO_CHANGES when the range has no committed changes", async () => {
+  const { root, head } = await setupRepo();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: head,
+        headRef: head,
+        steps: [{ description: "d" }],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "NO_CHANGES");
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("fails with INVALID_BASE_REF when the merge-base cannot be computed", async () => {
+  const { root, head } = await setupRepo();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: "no-such-branch",
+        headRef: head,
+        steps: [{ description: "d" }],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "INVALID_BASE_REF");
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("keeps the previous tour when NO_CHANGES occurs", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    await withServer(root, async (client) => {
+      const first = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: [{ description: "Original.", file: "feature.txt" }],
+      });
+      assert.equal(first.isError, false);
+      const second = await callTool(client, "create_changes_tour", {
+        baseRef: head,
+        headRef: head,
+        steps: [{ description: "Should not replace." }],
+      });
+      assert.equal(second.isError, true);
+      assert.equal(structuredCode(second), "NO_CHANGES");
+    });
+    assert.equal(
+      readTourFile(root, ".tours/changes.tour").ref,
+      head
+    );
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("warns when uncommitted changes are excluded", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    writeFile(root, "feature.txt", "modified locally\n");
+    writeFile(root, "untracked.txt", "new local file\n");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: [{ description: "d", file: "feature.txt" }],
+      });
+      assert.equal(response.isError, false);
+      assert.ok(warningCodes(response).includes("UNCOMMITTED_CHANGES_EXCLUDED"));
+    });
+    assert.equal(readTourFile(root, ".tours/changes.tour").ref, head);
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("ignores the reserved tour files when detecting a dirty workspace", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    writeFile(root, ".tours/project.tour", "{ generated earlier }");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: [{ description: "d", file: "feature.txt" }],
+      });
+      assert.equal(response.isError, false);
+      assert.ok(!warningCodes(response).includes("UNCOMMITTED_CHANGES_EXCLUDED"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("includes uncommitted changes explicitly and drops the ref", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    writeFile(root, "work-in-progress.txt", "local work\n");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        includeUncommittedChanges: true,
+        steps: [
+          { description: "Local work.", file: "work-in-progress.txt" },
+        ],
+      });
+      assert.equal(response.isError, false);
+      assert.ok(warningCodes(response).includes("UNCOMMITTED_CHANGES_INCLUDED"));
+    });
+    const tour = readTourFile(root, ".tours/changes.tour");
+    assert.equal(tour.ref, undefined);
+    assert.ok((tour.description as string).includes("non-reproducible"));
+    assert.ok(tourFileValidAgainstSchema(root, ".tours/changes.tour"));
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("warns with NO_CHANGED_FILE_ANCHOR when no step anchors a changed file", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: [{ description: "Only context, no anchors." }],
+      });
+      assert.equal(response.isError, false);
+      assert.ok(warningCodes(response).includes("NO_CHANGED_FILE_ANCHOR"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("does not warn when a step anchors a changed file", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: [{ description: "The new file.", file: "feature.txt" }],
+      });
+      assert.equal(response.isError, false);
+      assert.ok(!warningCodes(response).includes("NO_CHANGED_FILE_ANCHOR"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("allows deletion-only branches with content-only steps", async () => {
+  const root = tempDir();
+  await initGitRepo(root);
+  await commitFile(root, "victim.txt", "to be deleted\n", "add victim");
+  const baseSha = await headSha(root);
+  await git(["checkout", "-b", "cleanup"], root);
+  await git(["rm", "victim.txt"], root);
+  await git(["commit", "-m", "remove victim"], root);
+  const head = await headSha(root);
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: [{ description: "We removed victim.txt entirely." }],
+      });
+      assert.equal(response.isError, false);
+      assert.ok(warningCodes(response).includes("NO_CHANGED_FILE_ANCHOR"));
+    });
+    assert.equal(readTourFile(root, ".tours/changes.tour").ref, head);
+    assert.ok(tourFileValidAgainstSchema(root, ".tours/changes.tour"));
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("allows anchoring unchanged files for essential context", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: [
+          { description: "Context from the base file.", file: "base.txt" },
+          { description: "The new file.", file: "feature.txt" },
+        ],
+      });
+      assert.equal(response.isError, false);
+      assert.ok(!warningCodes(response).includes("NO_CHANGED_FILE_ANCHOR"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("aggregates step validation errors for a changes tour", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: [
+          { description: "d", file: "missing.txt" },
+          { description: "d", file: "feature.txt", line: 99 },
+        ],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "INVALID_PROPOSAL");
+      const issues = (response.structured.issues ?? []) as Array<{ path: string }>;
+      assert.ok(issues.some((issue) => issue.path === "steps[0].file"));
+      assert.ok(issues.some((issue) => issue.path === "steps[1].line"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("works when the workspace root is a subdirectory of the repository", async () => {
+  const root = tempDir();
+  await initGitRepo(root);
+  await commitFile(root, "packages/app/main.ts", "export {};\n", "add app");
+  await commitFile(root, "packages/app/util.ts", "export {};\n", "add util");
+  const baseSha = await headSha(root);
+  await git(["checkout", "-b", "sub", "-q"], root);
+  await commitFile(root, "packages/app/new.ts", "export {};\n", "add new file");
+  const head = await headSha(root);
+  const subRoot = `${root}/packages/app`;
+  try {
+    await withServer(subRoot, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: [{ description: "The new file.", file: "new.ts" }],
+      });
+      assert.equal(response.isError, false);
+      assert.ok(!warningCodes(response).includes("NO_CHANGED_FILE_ANCHOR"));
+    });
+    assert.ok(tourFileValidAgainstSchema(subRoot, ".tours/changes.tour"));
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("warns when the tour exceeds fifteen steps for a changes tour", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    const steps = Array.from({ length: 16 }, (_, index) => ({
+      description: `Step ${index + 1}.`,
+    }));
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps,
+      });
+      assert.equal(response.isError, false);
+      assert.equal(response.structured.stepCount, 16);
+      assert.ok(warningCodes(response).includes("STEP_LIMIT_EXCEEDED"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("warns when only staged changes are excluded", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    writeFile(root, "staged.txt", "staged but not committed\n");
+    await git(["add", "staged.txt"], root);
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: [{ description: "d", file: "feature.txt" }],
+      });
+      assert.equal(response.isError, false);
+      assert.ok(warningCodes(response).includes("UNCOMMITTED_CHANGES_EXCLUDED"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("warns when only unstaged changes are excluded", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    writeFile(root, "feature.txt", "committed feature\nlocal edit\n");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: [{ description: "The committed feature.", file: "feature.txt" }],
+      });
+      assert.equal(response.isError, false);
+      assert.ok(warningCodes(response).includes("UNCOMMITTED_CHANGES_EXCLUDED"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("warns when only untracked changes are excluded", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    writeFile(root, "untracked.txt", "not committed\n");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: [{ description: "The committed feature.", file: "feature.txt" }],
+      });
+      assert.equal(response.isError, false);
+      assert.ok(warningCodes(response).includes("UNCOMMITTED_CHANGES_EXCLUDED"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("explains local work when only uncommitted changes exist", async () => {
+  const { root, head } = await setupRepo();
+  try {
+    writeFile(root, "work-in-progress.txt", "local work\n");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: head,
+        headRef: head,
+        includeUncommittedChanges: true,
+        steps: [{ description: "Local work.", file: "work-in-progress.txt" }],
+      });
+      assert.equal(response.isError, false);
+      assert.equal(response.structured.status, "created");
+      assert.ok(warningCodes(response).includes("UNCOMMITTED_CHANGES_INCLUDED"));
+      assert.ok(!warningCodes(response).includes("NO_CHANGED_FILE_ANCHOR"));
+    });
+    const tour = readTourFile(root, ".tours/changes.tour");
+    assert.equal(tour.ref, undefined);
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("counts uncommitted files as changed for NO_CHANGED_FILE_ANCHOR", async () => {
+  const { root, baseSha, head } = await setupRepo();
+  try {
+    writeFile(root, "local-only.txt", "local work\n");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        includeUncommittedChanges: true,
+        steps: [{ description: "Local work.", file: "local-only.txt" }],
+      });
+      assert.equal(response.isError, false);
+      assert.ok(!warningCodes(response).includes("NO_CHANGED_FILE_ANCHOR"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test(
+  "preserves the previous tour when the write fails",
+  {
+    skip:
+      process.platform === "win32" &&
+      "POSIX directory permissions are unavailable",
+  },
+  async () => {
+    const { root, baseSha, head } = await setupRepo();
+    try {
+    await withServer(root, async (client) => {
+      const first = await callTool(client, "create_changes_tour", {
+        baseRef: baseSha,
+        headRef: head,
+        steps: [{ description: "Original.", file: "feature.txt" }],
+      });
+      assert.equal(first.isError, false);
+    });
+    const before = readTourFile(root, ".tours/changes.tour");
+    const toursDir = `${root}/.tours`;
+    const fs = await import("node:fs");
+    fs.chmodSync(toursDir, 0o555);
+    try {
+      await withServer(root, async (client) => {
+        const second = await callTool(client, "create_changes_tour", {
+          baseRef: baseSha,
+          headRef: head,
+          steps: [{ description: "Should not land.", file: "feature.txt" }],
+        });
+        assert.equal(second.isError, true);
+      });
+      assert.deepEqual(readTourFile(root, ".tours/changes.tour"), before);
+      const leftovers = fs
+        .readdirSync(toursDir)
+        .filter((name) => name.includes(".tmp-"));
+      assert.deepEqual(leftovers, []);
+    } finally {
+      fs.chmodSync(toursDir, 0o755);
+    }
+    } finally {
+      rmrf(root);
+    }
+  }
+);
diff --git a/packages/mcp-server/test/integration/cli.test.ts b/packages/mcp-server/test/integration/cli.test.ts
new file mode 100644
index 00000000..5ea8f7c5
--- /dev/null
+++ b/packages/mcp-server/test/integration/cli.test.ts
@@ -0,0 +1,20 @@
+import { test } from "node:test";
+import * as assert from "node:assert";
+import { spawnSync } from "node:child_process";
+import { CLI_PATH, rmrf, tempDir } from "../helpers/test-utils";
+
+test("uses the process working directory and rejects the removed workspace argument", () => {
+  const root = tempDir();
+  try {
+    const result = spawnSync(
+      process.execPath,
+      [CLI_PATH, "--workspace-root", root],
+      { cwd: root, encoding: "utf8", timeout: 5_000 }
+    );
+
+    assert.equal(result.status, 1);
+    assert.match(result.stderr, /Unknown argument: --workspace-root/);
+  } finally {
+    rmrf(root);
+  }
+});
diff --git a/packages/mcp-server/test/integration/packaged-binary.test.ts b/packages/mcp-server/test/integration/packaged-binary.test.ts
new file mode 100644
index 00000000..bbd30640
--- /dev/null
+++ b/packages/mcp-server/test/integration/packaged-binary.test.ts
@@ -0,0 +1,179 @@
+import { Client } from "@modelcontextprotocol/sdk/client/index.js";
+import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js";
+import * as assert from "node:assert";
+import { execFile } from "node:child_process";
+import * as fs from "node:fs";
+import * as path from "node:path";
+import { promisify } from "node:util";
+import { test } from "node:test";
+import {
+  callTool,
+  commitFile,
+  headSha,
+  initGitRepo,
+  readTourFile,
+  rmrf,
+  tempDir,
+} from "../helpers/test-utils";
+
+const execFileAsync = promisify(execFile);
+const packageRoot = path.join(__dirname, "..", "..", "..");
+
+async function npm(args: string[], cwd: string, cache: string): Promise<string> {
+  const npmCli = process.env.npm_execpath;
+  const command = npmCli ? process.execPath : "npm";
+  const commandArgs = npmCli ? [npmCli, ...args] : args;
+  const result = await execFileAsync(command, commandArgs, {
+    cwd,
+    encoding: "utf8",
+    env: {
+      ...process.env,
+      npm_config_cache: cache,
+      npm_config_update_notifier: "false",
+    },
+  });
+  return result.stdout;
+}
+
+test("the installed codetour-mcp binary serves both public MCP tools", async () => {
+  const sandbox = tempDir("codetour-mcp-package-test-");
+  const archiveDir = path.join(sandbox, "archive");
+  const installationRoot = path.join(sandbox, "consumer");
+  const workspaceRoot = path.join(sandbox, "workspace");
+  const npmCache = path.join(sandbox, "npm-cache");
+
+  try {
+    fs.mkdirSync(archiveDir, { recursive: true });
+    await npm(
+      ["pack", "--json", "--pack-destination", archiveDir],
+      packageRoot,
+      npmCache
+    );
+    const filename = fs
+      .readdirSync(archiveDir)
+      .find((entry) => entry.endsWith(".tgz"));
+    assert.ok(filename, "npm pack should create a package archive");
+    const archivePath = path.join(archiveDir, filename);
+
+    // Seed the consumer with the already-installed dependency tree, then pass
+    // every registry dependency exposed by the packed manifest as a local
+    // source. npm still resolves direct dependencies during an install even
+    // when their directories already exist; without the local sources, a cold
+    // platform-specific cache (notably macOS ARM) fails in --offline mode.
+    fs.mkdirSync(installationRoot, { recursive: true });
+    fs.cpSync(
+      path.join(packageRoot, "node_modules"),
+      path.join(installationRoot, "node_modules"),
+      { recursive: true }
+    );
+    await npm(
+      [
+        "install",
+        "--prefix",
+        installationRoot,
+        "--ignore-scripts",
+        "--offline",
+        "--package-lock=false",
+        "--no-audit",
+        "--no-fund",
+        archivePath,
+        path.join(packageRoot, "node_modules", "@modelcontextprotocol", "sdk"),
+        path.join(packageRoot, "node_modules", "ajv"),
+        path.join(packageRoot, "node_modules", "@resvg", "resvg-js"),
+        path.join(packageRoot, "node_modules", "jsdom"),
+        path.join(packageRoot, "node_modules", "mermaid"),
+        path.join(packageRoot, "node_modules", "zod"),
+      ],
+      sandbox,
+      npmCache
+    );
+
+    // The shared renderer is a local monorepo package, so npm pack cannot
+    // carry its sibling path dependency into the isolated consumer. Seed the
+    // consumer with the already-built package and its already-installed
+    // dependency tree, preserving the test's fully offline contract.
+    const rendererRoot = path.join(packageRoot, "..", "description-renderer");
+    const rendererTarget = path.join(
+      installationRoot,
+      "node_modules",
+      "codetour-description-renderer"
+    );
+    let rendererIsAlreadyLinked = false;
+    try {
+      rendererIsAlreadyLinked = fs.lstatSync(rendererTarget).isSymbolicLink();
+    } catch {
+      // The package installer may not have created the local dependency.
+    }
+    if (rendererIsAlreadyLinked) {
+      fs.unlinkSync(rendererTarget);
+    }
+    if (!rendererIsAlreadyLinked || !fs.existsSync(rendererTarget)) {
+      fs.cpSync(rendererRoot, rendererTarget, {
+        recursive: true,
+        filter: (source) =>
+          path.basename(source) !== "node_modules" &&
+          !source.includes(`${path.sep}node_modules${path.sep}`),
+      });
+      fs.cpSync(
+        path.join(rendererRoot, "node_modules"),
+        path.join(installationRoot, "node_modules"),
+        { recursive: true }
+      );
+    }
+
+    fs.mkdirSync(workspaceRoot, { recursive: true });
+    await initGitRepo(workspaceRoot);
+    await commitFile(workspaceRoot, "base.txt", "base\n", "add base");
+    const baseRef = await headSha(workspaceRoot);
+    await commitFile(workspaceRoot, "feature.txt", "feature\n", "add feature");
+    const headRef = await headSha(workspaceRoot);
+    assert.match(baseRef, /^[0-9a-f]{40}$/);
+    assert.match(headRef, /^[0-9a-f]{40}$/);
+
+    const binaryPath = path.join(
+      installationRoot,
+      "node_modules",
+      ".bin",
+      "codetour-mcp"
+    );
+    const client = new Client(
+      { name: "packaged-binary-test-client", version: "0.0.0" },
+      { capabilities: {} }
+    );
+    const transport = new StdioClientTransport({
+      command: binaryPath,
+      cwd: workspaceRoot,
+    });
+    await client.connect(transport);
+    try {
+      const tools = await client.listTools();
+      const changesTool = tools.tools.find((tool) => tool.name === "create_changes_tour");
+      assert.ok(changesTool);
+      assert.ok(
+        Object.prototype.hasOwnProperty.call(
+          (changesTool.inputSchema.properties ?? {}) as object,
+          "headRef"
+        ),
+        JSON.stringify(changesTool.inputSchema)
+      );
+      const changesTour = await callTool(client, "create_changes_tour", {
+        baseRef,
+        headRef,
+        steps: [{ description: "The feature.", file: "feature.txt" }],
+      });
+      assert.equal(changesTour.isError, false, changesTour.text);
+
+      const projectTour = await callTool(client, "create_project_tour", {
+        steps: [{ description: "The project base.", file: "base.txt" }],
+      });
+      assert.equal(projectTour.isError, false);
+    } finally {
+      await client.close();
+    }
+
+    assert.equal(readTourFile(workspaceRoot, ".tours/project.tour").title, "Project Overview");
+    assert.equal(readTourFile(workspaceRoot, ".tours/changes.tour").ref, headRef);
+  } finally {
+    rmrf(sandbox);
+  }
+});
diff --git a/packages/mcp-server/test/integration/project-tour.test.ts b/packages/mcp-server/test/integration/project-tour.test.ts
new file mode 100644
index 00000000..f5be7714
--- /dev/null
+++ b/packages/mcp-server/test/integration/project-tour.test.ts
@@ -0,0 +1,554 @@
+import { test } from "node:test";
+import * as assert from "node:assert";
+import * as fs from "node:fs";
+import * as path from "node:path";
+import {
+  callTool,
+  issuePaths,
+  readTourFile,
+  rmrf,
+  structuredCode,
+  structuredIssues,
+  tempDir,
+  tourFileValidAgainstSchema,
+  warningCodes,
+  withServer,
+  writeFile,
+} from "../helpers/test-utils";
+import {
+  ALLOWED_DIAGRAM_SOURCES,
+  INVALID_FLOWCHART_SOURCE,
+  captionedDiagram,
+  oversizedFlowchartSource,
+} from "../helpers/mermaid-fixtures";
+
+test("accepts all five allowed Mermaid kinds in a Project Tour", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: Object.entries(ALLOWED_DIAGRAM_SOURCES).map(([kind, source]) => ({
+          description: captionedDiagram(`${kind} overview`, source),
+        })),
+      });
+      assert.equal(response.isError, false, response.text);
+      assert.equal(response.structured.stepCount, 5);
+    });
+    const tour = readTourFile(root, ".tours/project.tour");
+    assert.equal((tour.steps as unknown[]).length, 5);
+    assert.ok(tourFileValidAgainstSchema(root, ".tours/project.tour"));
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("aggregates Mermaid errors with fence paths and source locations", async () => {
+  const root = tempDir();
+  try {
+    const description = [
+      ["Introductory text", "", "```mermaid", ALLOWED_DIAGRAM_SOURCES.flowchart, "```"].join("\n"),
+      captionedDiagram("Unsupported", "pie title Pets\n    \"Dogs\" : 1"),
+      captionedDiagram("Oversized", oversizedFlowchartSource()),
+      captionedDiagram("Fourth", ALLOWED_DIAGRAM_SOURCES.flowchart),
+    ].join("\n\n");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        description,
+        steps: [
+          {
+            description: captionedDiagram("Broken syntax", INVALID_FLOWCHART_SOURCE),
+          },
+          {
+            description: [
+              "**Diagram – malformed caption**",
+              "",
+              "```mermaid",
+              ALLOWED_DIAGRAM_SOURCES.flowchart,
+              "```",
+            ].join("\n"),
+          },
+        ],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "INVALID_PROPOSAL");
+      const issues = structuredIssues(response);
+      assert.deepEqual(
+        issues.map((issue) => issue.path),
+        [
+          "description.mermaid[0].caption",
+          "description.mermaid[1].kind",
+          "description.mermaid[2].source",
+          "description.mermaid[3]",
+          "steps[0].description.mermaid[0].source",
+          "steps[1].description.mermaid[0].caption",
+        ]
+      );
+      assert.ok(issues.every((issue) => issue.message.includes("line")));
+    });
+    assert.equal(fs.existsSync(path.join(root, ".tours/project.tour")), false);
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("preserves the previous Project Tour when Mermaid validation fails", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const first = await callTool(client, "create_project_tour", {
+        title: "Original",
+        steps: [{ description: "Original step." }],
+      });
+      assert.equal(first.isError, false);
+      const before = readTourFile(root, ".tours/project.tour");
+
+      const second = await callTool(client, "create_project_tour", {
+        title: "Broken",
+        steps: [
+          {
+            description: captionedDiagram("Broken", INVALID_FLOWCHART_SOURCE),
+          },
+        ],
+      });
+      assert.equal(second.isError, true);
+      assert.equal(structuredCode(second), "INVALID_PROPOSAL");
+      assert.deepEqual(readTourFile(root, ".tours/project.tour"), before);
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("creates a project tour with the default title and no git ref", async () => {
+  const root = tempDir();
+  try {
+    writeFile(root, "src/index.ts", "export const answer = 42;\n");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        description: "An overview of the project.",
+        steps: [
+          { description: "Intro step." },
+          { description: "The entry point.", file: "src/index.ts", line: 1 },
+        ],
+      });
+      assert.equal(response.isError, false);
+      assert.equal(response.structured.status, "created");
+      assert.equal(response.structured.path, ".tours/project.tour");
+      assert.equal(response.structured.stepCount, 2);
+      assert.deepEqual(response.structured.warnings, []);
+    });
+    const tour = readTourFile(root, ".tours/project.tour");
+    assert.equal(tour.title, "Project Overview");
+    assert.equal(tour.description, "An overview of the project.");
+    assert.equal(tour.ref, undefined);
+    assert.equal(tour.$schema, "https://aka.ms/codetour-schema");
+    assert.ok(tourFileValidAgainstSchema(root, ".tours/project.tour"));
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("uses the provided title and omits the description when absent", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        title: "My Tour",
+        steps: [{ description: "Sole step." }],
+      });
+      assert.equal(response.isError, false);
+    });
+    const tour = readTourFile(root, ".tours/project.tour");
+    assert.equal(tour.title, "My Tour");
+    assert.equal(tour.description, undefined);
+    assert.ok(tourFileValidAgainstSchema(root, ".tours/project.tour"));
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("works in a workspace that is not a git repository", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [{ description: "No git here." }],
+      });
+      assert.equal(response.isError, false);
+      assert.equal(response.structured.status, "created");
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("rejects an empty steps array with TOUR_STEPS_REQUIRED", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "TOUR_STEPS_REQUIRED");
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("rejects a missing steps array with TOUR_STEPS_REQUIRED", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {});
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "TOUR_STEPS_REQUIRED");
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("aggregates top-level Mermaid errors even when steps are missing", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        description: captionedDiagram("Broken", INVALID_FLOWCHART_SOURCE),
+        steps: [],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "INVALID_PROPOSAL");
+      assert.ok(issuePaths(response).includes("description.mermaid[0].source"));
+      assert.ok(issuePaths(response).includes("steps"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("rejects an unterminated Mermaid fence", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        description: [
+          "**Diagram — Unterminated**",
+          "",
+          "```mermaid",
+          ALLOWED_DIAGRAM_SOURCES.flowchart,
+        ].join("\n"),
+        steps: [{ description: "A valid step." }],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "INVALID_PROPOSAL");
+      assert.ok(issuePaths(response).includes("description.mermaid[0].source"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("aggregates all step validation errors in one response", async () => {
+  const root = tempDir();
+  try {
+    writeFile(root, "a.ts", "one\ntwo\n");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [
+          { description: "Missing file.", file: "nope.ts", line: 1 },
+          { file: "a.ts" },
+        ],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "INVALID_PROPOSAL");
+      const paths = issuePaths(response);
+      assert.ok(paths.includes("steps[0].file"));
+      assert.ok(paths.includes("steps[0].line"));
+      assert.ok(paths.includes("steps[1].description"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("keeps the previous tour when the new proposal is invalid", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const first = await callTool(client, "create_project_tour", {
+        title: "Original",
+        steps: [{ description: "Original step." }],
+      });
+      assert.equal(first.isError, false);
+
+      const second = await callTool(client, "create_project_tour", {
+        title: "Broken",
+        steps: [{ description: "Broken step.", file: "missing.ts" }],
+      });
+      assert.equal(second.isError, true);
+      assert.equal(structuredCode(second), "INVALID_PROPOSAL");
+    });
+    const tour = readTourFile(root, ".tours/project.tour");
+    assert.equal(tour.title, "Original");
+    assert.ok(tourFileValidAgainstSchema(root, ".tours/project.tour"));
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("replaces the previous tour atomically on success", async () => {
+  const root = tempDir();
+  try {
+    writeFile(root, "a.ts", "one\n");
+    await withServer(root, async (client) => {
+      await callTool(client, "create_project_tour", {
+        title: "First",
+        steps: [{ description: "First step." }],
+      });
+      const second = await callTool(client, "create_project_tour", {
+        title: "Second",
+        steps: [{ description: "Second step.", file: "a.ts" }],
+      });
+      assert.equal(second.isError, false);
+    });
+    const tour = readTourFile(root, ".tours/project.tour");
+    assert.equal(tour.title, "Second");
+    assert.equal((tour.steps as unknown[]).length, 1);
+    assert.ok(tourFileValidAgainstSchema(root, ".tours/project.tour"));
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("anchors a step on a directory", async () => {
+  const root = tempDir();
+  try {
+    writeFile(root, "lib/util.ts", "export {};\n");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [{ description: "The lib area.", directory: "lib" }],
+      });
+      assert.equal(response.isError, false);
+    });
+    assert.ok(tourFileValidAgainstSchema(root, ".tours/project.tour"));
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("anchors a step on a unique pattern", async () => {
+  const root = tempDir();
+  try {
+    writeFile(root, "a.ts", "const x = 1;\nconst y = 2;\n");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [
+          { description: "The y declaration.", file: "a.ts", pattern: "const y" },
+        ],
+      });
+      assert.equal(response.isError, false);
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("anchors a step on a valid selection", async () => {
+  const root = tempDir();
+  try {
+    writeFile(root, "a.ts", "export const answer = 42;\n");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [
+          {
+            description: "The answer.",
+            file: "a.ts",
+            selection: {
+              start: { line: 1, character: 21 },
+              end: { line: 1, character: 23 },
+            },
+          },
+        ],
+      });
+      assert.equal(response.isError, false);
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("rejects an out-of-range selection", async () => {
+  const root = tempDir();
+  try {
+    writeFile(root, "a.ts", "short\n");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [
+          {
+            description: "Too long.",
+            file: "a.ts",
+            selection: {
+              start: { line: 1, character: 1 },
+              end: { line: 1, character: 99 },
+            },
+          },
+        ],
+      });
+      assert.equal(response.isError, true);
+      assert.ok(
+        structuredIssues(response).some((issue) =>
+          issue.path.includes("selection.end.character")
+        )
+      );
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("rejects an out-of-range line", async () => {
+  const root = tempDir();
+  try {
+    writeFile(root, "a.ts", "one\n");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [{ description: "Too far.", file: "a.ts", line: 10 }],
+      });
+      assert.equal(response.isError, true);
+      assert.ok(issuePaths(response).includes("steps[0].line"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("warns without blocking when the tour exceeds fifteen steps", async () => {
+  const root = tempDir();
+  try {
+    const steps = Array.from({ length: 16 }, (_, index) => ({
+      description: `Step ${index + 1}.`,
+    }));
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", { steps });
+      assert.equal(response.isError, false);
+      assert.equal(response.structured.stepCount, 16);
+      assert.ok(warningCodes(response).includes("STEP_LIMIT_EXCEEDED"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("rejects CodeTour commands, when expressions and uri fields", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        when: "true",
+        steps: [
+          { description: "d", commands: ["workbench.action.quit"] },
+          { description: "d", uri: "https://example.com" },
+        ],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "INVALID_PROPOSAL");
+      const paths = issuePaths(response);
+      assert.ok(paths.includes("when"));
+      assert.ok(paths.includes("steps[0].commands"));
+      assert.ok(paths.includes("steps[1].uri"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("rejects active markdown URI schemes in descriptions", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [
+          { description: "Run this: [click](command:workbench.action.quit)" },
+        ],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "INVALID_PROPOSAL");
+      assert.ok(issuePaths(response).includes("steps[0].description"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("allows ordinary https links and images in descriptions", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [
+          {
+            description:
+              "See [the docs](https://example.com/docs) and ![diagram](https://example.com/diagram.png).",
+          },
+        ],
+      });
+      assert.equal(response.isError, false);
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("rejects absolute paths as anchors", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [{ description: "d", file: "/etc/passwd" }],
+      });
+      assert.equal(response.isError, true);
+      assert.ok(issuePaths(response).includes("steps[0].file"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("rejects relative paths escaping the workspace root", async () => {
+  const root = tempDir();
+  try {
+    writeFile(root, "a.ts", "one\n");
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [{ description: "d", file: "../escape.ts" }],
+      });
+      assert.equal(response.isError, true);
+      assert.ok(issuePaths(response).includes("steps[0].file"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("rejects symlinks that escape the workspace root", async () => {
+  const root = tempDir();
+  const outside = tempDir();
+  try {
+    writeFile(outside, "secret.ts", "top secret\n");
+    writeFile(root, "a.ts", "one\n");
+    const fs = await import("node:fs");
+    fs.symlinkSync(outside, `${root}/link-out`);
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [{ description: "d", file: "link-out/secret.ts" }],
+      });
+      assert.equal(response.isError, true);
+      assert.ok(issuePaths(response).includes("steps[0].file"));
+    });
+  } finally {
+    rmrf(root);
+    rmrf(outside);
+  }
+});
diff --git a/packages/mcp-server/test/integration/security.test.ts b/packages/mcp-server/test/integration/security.test.ts
new file mode 100644
index 00000000..903bde94
--- /dev/null
+++ b/packages/mcp-server/test/integration/security.test.ts
@@ -0,0 +1,122 @@
+import { test } from "node:test";
+import * as assert from "node:assert";
+import {
+  callTool,
+  rmrf,
+  structuredCode,
+  tempDir,
+  withServer,
+} from "../helpers/test-utils";
+
+test("rejects a file: scheme in a step description", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [{ description: "Open [the file](file:///etc/passwd)." }],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "INVALID_PROPOSAL");
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("rejects vscode: and javascript: schemes in a step description", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [
+          { description: "Click [here](vscode://file/x)." },
+          { description: "Execute [this](javascript:alert(1))." },
+        ],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "INVALID_PROPOSAL");
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("rejects a command scheme in a changes tour description", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [{ description: "Run [this](command:workbench.action.quit)." }],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "INVALID_PROPOSAL");
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("rejects an active scheme in the tour-level description", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        description: "See [the launch command](command:workbench.action.quit).",
+        steps: [{ description: "Fine step." }],
+      });
+      assert.equal(response.isError, true);
+      assert.equal(structuredCode(response), "INVALID_PROPOSAL");
+      const issues = (response.structured.issues ?? []) as Array<{ path: string }>;
+      assert.ok(issues.some((issue) => issue.path === "description"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("exposes exactly two tools", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const tools = await client.listTools();
+      const names = tools.tools.map((tool) => tool.name).sort();
+      assert.deepEqual(names, ["create_changes_tour", "create_project_tour"]);
+      const project = tools.tools.find((tool) => tool.name === "create_project_tour");
+      assert.ok(project);
+      assert.ok(project!.description!.includes("Project Tour"));
+      assert.ok(
+        project!.description!.includes("Begin with a directory-anchored overview step")
+      );
+      assert.ok(project!.description!.includes("tour is scoped to a subdirectory"));
+      assert.ok(project!.description!.includes("Use Mermaid sparingly"));
+      assert.ok(project!.description!.includes("flowchart, sequenceDiagram"));
+      assert.ok(project!.description!.includes("at most 3 Mermaid fences"));
+      assert.ok(project!.description!.includes("20 KB"));
+      const changes = tools.tools.find((tool) => tool.name === "create_changes_tour");
+      assert.ok(changes);
+      assert.ok(changes!.description!.includes("Changes Tour"));
+      assert.ok(changes!.description!.includes("**Diagram — …**"));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
+
+test("returns a human-readable message and a structured result", async () => {
+  const root = tempDir();
+  try {
+    await withServer(root, async (client) => {
+      const response = await callTool(client, "create_project_tour", {
+        steps: [{ description: "Hello." }],
+      });
+      assert.equal(response.isError, false);
+      assert.ok(response.text.includes(".tours/project.tour"));
+      assert.equal(response.structured.status, "created");
+      assert.equal(response.structured.path, ".tours/project.tour");
+      assert.equal(response.structured.stepCount, 1);
+      assert.ok(Array.isArray(response.structured.warnings));
+    });
+  } finally {
+    rmrf(root);
+  }
+});
diff --git a/packages/mcp-server/test/unit/validation.test.ts b/packages/mcp-server/test/unit/validation.test.ts
new file mode 100644
index 00000000..ed3c0015
--- /dev/null
+++ b/packages/mcp-server/test/unit/validation.test.ts
@@ -0,0 +1,192 @@
+import { test } from "node:test";
+import * as assert from "node:assert";
+import * as fs from "node:fs";
+import * as path from "node:path";
+import { createContext } from "../../src/context";
+import {
+  MAX_RECOMMENDED_STEPS,
+  validateChangesParams,
+  validateProjectParams,
+  validateSteps,
+} from "../../src/validation";
+import { rmrf, tempDir, writeFile } from "../helpers/test-utils";
+
+test("validateProjectParams rejects non-object arguments", () => {
+  const { issues } = validateProjectParams("not-an-object");
+  assert.ok(issues.some((issue) => issue.path === "$"));
+});
+
+test("validateProjectParams rejects unknown root fields", () => {
+  const { issues } = validateProjectParams({ when: "true", steps: [] });
+  assert.ok(issues.some((issue) => issue.path === "when"));
+});
+
+test("validateProjectParams requires a string title and description", () => {
+  const { issues } = validateProjectParams({
+    title: 5,
+    description: false,
+    steps: [],
+  });
+  const paths = issues.map((issue) => issue.path);
+  assert.ok(paths.includes("title"));
+  assert.ok(paths.includes("description"));
+});
+
+test("validateChangesParams requires baseRef and a full headRef SHA", () => {
+  const { issues } = validateChangesParams({ steps: [] });
+  const paths = issues.map((issue) => issue.path);
+  assert.ok(paths.includes("baseRef"));
+  assert.ok(paths.includes("headRef"));
+});
+
+test("validateChangesParams accepts the public Changes Tour contract", () => {
+  const headRef = "a".repeat(40);
+  const { params, issues } = validateChangesParams({
+    baseRef: "main",
+    headRef,
+    includeUncommittedChanges: true,
+    steps: [{ description: "Explain the change." }],
+  });
+
+  assert.deepEqual(issues, []);
+  assert.equal(params?.baseRef, "main");
+  assert.equal(params?.headRef, headRef);
+  assert.equal(params?.includeUncommittedChanges, true);
+});
+
+test("validateChangesParams rejects a short head SHA", () => {
+  const { issues } = validateChangesParams({
+    baseRef: "main",
+    headRef: "deadbeef",
+    steps: [],
+  });
+  assert.ok(issues.some((issue) => issue.path === "headRef"));
+});
+
+test("validateChangesParams rejects a non-boolean includeUncommittedChanges", () => {
+  const { issues } = validateChangesParams({
+    baseRef: "main",
+    headRef: "a".repeat(40),
+    includeUncommittedChanges: "yes",
+    steps: [],
+  });
+  assert.ok(issues.some((issue) => issue.path === "includeUncommittedChanges"));
+});
+
+function workspaceWithFiles(files: Record<string, string>): string {
+  const dir = tempDir();
+  for (const [name, content] of Object.entries(files)) {
+    writeFile(dir, name, content);
+  }
+  return dir;
+}
+
+function validate(rawSteps: unknown[], root: string) {
+  return validateSteps(rawSteps, createContext(root));
+}
+
+test("a step rejects a file and a directory together", () => {
+  const root = workspaceWithFiles({ "a.ts": "x" });
+  fs.mkdirSync(path.join(root, "sub"));
+  const { issues } = validate(
+    [{ description: "d", file: "a.ts", directory: "sub" }],
+    root
+  );
+  assert.ok(issues.some((issue) => issue.path === "steps[0]"));
+  rmrf(root);
+});
+
+test("line and pattern are mutually exclusive", () => {
+  const root = workspaceWithFiles({ "a.ts": "one\ntwo\n" });
+  const { issues } = validate(
+    [{ description: "d", file: "a.ts", line: 1, pattern: "two" }],
+    root
+  );
+  assert.ok(issues.some((issue) => issue.message.includes("mutually exclusive")));
+  rmrf(root);
+});
+
+test("line, pattern and selection require a file", () => {
+  const root = workspaceWithFiles({ "a.ts": "one\ntwo\n" });
+  const { issues } = validate(
+    [
+      { description: "d", line: 1 },
+      { description: "d", pattern: "one" },
+      {
+        description: "d",
+        selection: { start: { line: 1, character: 1 }, end: { line: 1, character: 2 } },
+      },
+    ],
+    root
+  );
+  assert.equal(issues.length, 3);
+  rmrf(root);
+});
+
+test("line must be a positive integer", () => {
+  const root = workspaceWithFiles({ "a.ts": "one\n" });
+  const { issues } = validate(
+    [
+      { description: "d", file: "a.ts", line: 0 },
+      { description: "d", file: "a.ts", line: 1.5 },
+    ],
+    root
+  );
+  assert.equal(issues.filter((issue) => issue.path.endsWith(".line")).length, 2);
+  rmrf(root);
+});
+
+test("a pattern must match exactly one occurrence", () => {
+  const root = workspaceWithFiles({ "a.ts": "one\ntwo\none\n" });
+  const { issues } = validate(
+    [
+      { description: "d", file: "a.ts", pattern: "one" },
+      { description: "d", file: "a.ts", pattern: "three" },
+    ],
+    root
+  );
+  assert.equal(issues.length, 2);
+  rmrf(root);
+});
+
+test("an invalid regular expression is rejected", () => {
+  const root = workspaceWithFiles({ "a.ts": "one\n" });
+  const { issues } = validate(
+    [{ description: "d", file: "a.ts", pattern: "(unclosed" }],
+    root
+  );
+  assert.equal(issues.length, 1);
+  rmrf(root);
+});
+
+test("steps may anchor files and directories without line targeting", () => {
+  const root = workspaceWithFiles({ "a.ts": "one\ntwo\n" });
+  fs.mkdirSync(path.join(root, "sub"));
+  const { steps, issues } = validate(
+    [
+      { description: "d", file: "a.ts" },
+      { description: "d", directory: "sub" },
+    ],
+    root
+  );
+  assert.equal(issues.length, 0);
+  assert.ok(steps);
+  assert.equal(steps!.length, 2);
+  rmrf(root);
+});
+
+test("content-only steps without any anchor are allowed", () => {
+  const root = workspaceWithFiles({ "a.ts": "one\n" });
+  const { steps, issues } = validate(
+    [{ description: "intro" }, { description: "deleted file context" }],
+    root
+  );
+  assert.equal(issues.length, 0);
+  assert.ok(steps);
+  assert.equal(steps!.length, 2);
+  rmrf(root);
+});
+
+test("the recommended step maximum is fifteen", () => {
+  assert.equal(MAX_RECOMMENDED_STEPS, 15);
+});
diff --git a/packages/mcp-server/tsconfig.json b/packages/mcp-server/tsconfig.json
new file mode 100644
index 00000000..d69a0d76
--- /dev/null
+++ b/packages/mcp-server/tsconfig.json
@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2022"],
+    "module": "node16",
+    "moduleResolution": "node16",
+    "outDir": "dist",
+    "rootDir": ".",
+    "strict": true,
+    "noUnusedLocals": true,
+    "esModuleInterop": true,
+    "resolveJsonModule": true,
+    "skipLibCheck": true,
+    "sourceMap": true,
+    "declaration": false,
+    "types": ["node"]
+  },
+  "include": ["src", "test"]
+}
diff --git a/scripts/package-extension.js b/scripts/package-extension.js
new file mode 100644
index 00000000..bdfa5c8e
--- /dev/null
+++ b/scripts/package-extension.js
@@ -0,0 +1,89 @@
+const fs = require("node:fs");
+const path = require("node:path");
+const { spawnSync } = require("node:child_process");
+const { TARGETS, hostTarget } = require("./prepare-resvg-runtime");
+
+const root = path.resolve(__dirname, "..");
+const target = process.env.CODETOUR_TARGET || hostTarget();
+
+function run(command, args, options = {}) {
+  const result = spawnSync(command, args, {
+    cwd: root,
+    env: { ...process.env, CODETOUR_TARGET: target },
+    stdio: options.capture ? ["ignore", "pipe", "pipe"] : "inherit",
+    shell: process.platform === "win32",
+    encoding: "utf8"
+  });
+  if (result.error) {
+    throw result.error;
+  }
+  if (result.status !== 0) {
+    throw new Error(`${command} ${args.join(" ")} exited with status ${result.status}`);
+  }
+  return options.capture ? `${result.stdout || ""}${result.stderr || ""}` : "";
+}
+
+function main() {
+  if (!TARGETS[target]) {
+    throw new Error(`Unsupported CodeTour packaging target: ${target}`);
+  }
+
+  const npm = process.platform === "win32" ? "npm.cmd" : "npm";
+  const vsce = path.join(
+    root,
+    "node_modules",
+    ".bin",
+    process.platform === "win32" ? "vsce.cmd" : "vsce"
+  );
+
+  run(npm, ["run", "build"]);
+  const listing = run(vsce, ["ls"], { capture: true });
+  const packageJson = JSON.parse(
+    fs.readFileSync(path.join(root, "package.json"), "utf8")
+  );
+  if (packageJson.browser) {
+    throw new Error("The packaged extension must not contain a browser entry point.");
+  }
+
+  const manifest = JSON.parse(
+    fs.readFileSync(path.join(root, "dist", "resvg-runtime", "manifest.json"), "utf8")
+  );
+  if (manifest.target !== target || manifest.binary !== TARGETS[target].binary) {
+    throw new Error("The staged rasterizer runtime does not match the requested VSIX target.");
+  }
+  const files = listing
+    .split(/\r?\n/u)
+    .map((line) => line.trim())
+    .filter(Boolean);
+  const expectedBinary = `dist/resvg-runtime/resvg-js/${manifest.binary}`;
+  if (!files.some((file) => file === expectedBinary || file.endsWith(`/${expectedBinary}`))) {
+    throw new Error(`VSIX file list does not contain ${expectedBinary}.`);
+  }
+  if (files.some((file) => file.includes("extension-web"))) {
+    throw new Error("The packaged extension contains the removed Web artifact.");
+  }
+  if (files.length > 2000) {
+    throw new Error(`VSIX contains ${files.length} files; the packaging budget is 2000.`);
+  }
+
+  run(vsce, ["package", "--target", target]);
+  const version = packageJson.version;
+  const artifact = fs
+    .readdirSync(root)
+    .filter((file) => file.endsWith(`-${target}-${version}.vsix`))
+    .map((file) => path.join(root, file))
+    .find((file) => fs.statSync(file).isFile());
+  if (!artifact) {
+    throw new Error(`vsce did not create the ${version}-${target} artifact.`);
+  }
+  const size = fs.statSync(artifact).size;
+  if (size >= 38 * 1024 * 1024) {
+    throw new Error(`VSIX is ${size} bytes; it exceeds the 38 MiB packaging budget.`);
+  }
+  run(process.execPath, [path.join(root, "scripts", "verify-vsix.js"), artifact, target]);
+  console.log(
+    `Packaged ${path.basename(artifact)} for ${target}: ${size} bytes.`
+  );
+}
+
+main();
diff --git a/scripts/prepare-resvg-runtime.js b/scripts/prepare-resvg-runtime.js
new file mode 100644
index 00000000..91c84c98
--- /dev/null
+++ b/scripts/prepare-resvg-runtime.js
@@ -0,0 +1,138 @@
+const fs = require("node:fs");
+const path = require("node:path");
+
+const root = path.resolve(__dirname, "..");
+const RESVG_VERSION = "2.6.2";
+
+// VS Code's standard desktop/remote Node targets. Linux artifacts are built
+// against glibc; the package must be built again on a musl host if that host
+// is added to the published target matrix.
+const TARGETS = Object.freeze({
+  "darwin-arm64": {
+    packageName: "@resvg/resvg-js-darwin-arm64",
+    binary: "resvgjs.darwin-arm64.node"
+  },
+  "darwin-x64": {
+    packageName: "@resvg/resvg-js-darwin-x64",
+    binary: "resvgjs.darwin-x64.node"
+  },
+  "linux-arm64": {
+    packageName: "@resvg/resvg-js-linux-arm64-gnu",
+    binary: "resvgjs.linux-arm64-gnu.node"
+  },
+  "linux-x64": {
+    packageName: "@resvg/resvg-js-linux-x64-gnu",
+    binary: "resvgjs.linux-x64-gnu.node"
+  },
+  "win32-arm64": {
+    packageName: "@resvg/resvg-js-win32-arm64-msvc",
+    binary: "resvgjs.win32-arm64-msvc.node"
+  },
+  "win32-x64": {
+    packageName: "@resvg/resvg-js-win32-x64-msvc",
+    binary: "resvgjs.win32-x64-msvc.node"
+  }
+});
+
+function hostTarget() {
+  return `${process.platform}-${process.arch}`;
+}
+
+function requestedTarget() {
+  const argumentIndex = process.argv.indexOf("--target");
+  return argumentIndex >= 0 && process.argv[argumentIndex + 1]
+    ? process.argv[argumentIndex + 1]
+    : process.env.CODETOUR_TARGET || hostTarget();
+}
+
+function dependencyRoot() {
+  const candidates = [
+    path.join(root, "node_modules"),
+    path.join(root, "packages", "description-renderer", "node_modules")
+  ];
+  const selected = candidates.find((candidate) =>
+    fs.existsSync(path.join(candidate, "@resvg", "resvg-js", "js-binding.js"))
+  );
+  if (!selected) {
+    throw new Error(
+      "Unable to find @resvg/resvg-js. Install the root and description-renderer dependencies first."
+    );
+  }
+  return selected;
+}
+
+function prepareRuntime(target = requestedTarget()) {
+  const specification = TARGETS[target];
+  if (!specification) {
+    throw new Error(
+      `Unsupported CodeTour packaging target ${target}. Supported targets: ${Object.keys(TARGETS).join(", ")}`
+    );
+  }
+  if (target !== hostTarget()) {
+    throw new Error(
+      `The ${target} artifact must be built on a ${target} Node host; current host is ${hostTarget()}. ` +
+        "Build each VSIX on its matching CI runner so its native rasterizer is executable."
+    );
+  }
+
+  const modulesRoot = dependencyRoot();
+  const basePackage = path.join(modulesRoot, "@resvg", "resvg-js");
+  const nativePackage = path.join(
+    modulesRoot,
+    "@resvg",
+    specification.packageName.slice("@resvg/".length)
+  );
+  const nativeSource = path.join(nativePackage, specification.binary);
+  if (!fs.existsSync(nativeSource)) {
+    throw new Error(
+      `Missing rasterizer binary ${nativeSource}. Run npm ci on a ${target} host before packaging.`
+    );
+  }
+
+  const baseManifest = JSON.parse(
+    fs.readFileSync(path.join(basePackage, "package.json"), "utf8")
+  );
+  if (baseManifest.version !== RESVG_VERSION) {
+    throw new Error(
+      `Expected @resvg/resvg-js ${RESVG_VERSION}, found ${baseManifest.version}.`
+    );
+  }
+
+  const runtimeRoot = path.join(root, "dist", "resvg-runtime");
+  const runtimePackage = path.join(runtimeRoot, "resvg-js");
+  fs.rmSync(runtimeRoot, { recursive: true, force: true });
+  fs.mkdirSync(runtimePackage, { recursive: true });
+  for (const file of ["index.js", "js-binding.js"]) {
+    fs.copyFileSync(path.join(basePackage, file), path.join(runtimePackage, file));
+  }
+  fs.copyFileSync(nativeSource, path.join(runtimePackage, specification.binary));
+  fs.writeFileSync(
+    path.join(runtimePackage, "package.json"),
+    `${JSON.stringify({ name: "@resvg/resvg-js", version: RESVG_VERSION, main: "index.js" }, null, 2)}\n`
+  );
+  fs.writeFileSync(
+    path.join(runtimeRoot, "manifest.json"),
+    `${JSON.stringify(
+      {
+        target,
+        packageName: specification.packageName,
+        binary: specification.binary,
+        version: RESVG_VERSION
+      },
+      null,
+      2
+    )}\n`
+  );
+
+  return {
+    target,
+    binary: specification.binary,
+    runtimeRoot
+  };
+}
+
+if (require.main === module) {
+  console.log(JSON.stringify(prepareRuntime(), null, 2));
+}
+
+module.exports = { TARGETS, hostTarget, prepareRuntime };
diff --git a/scripts/publish-vsix.js b/scripts/publish-vsix.js
new file mode 100644
index 00000000..0c7aaf74
--- /dev/null
+++ b/scripts/publish-vsix.js
@@ -0,0 +1,34 @@
+const fs = require("node:fs");
+const path = require("node:path");
+const { spawnSync } = require("node:child_process");
+
+const root = path.resolve(__dirname, "..");
+const artifacts = fs
+  .readdirSync(root)
+  .filter((file) => file.endsWith(".vsix"))
+  .map((file) => path.join(root, file))
+  .filter((file) => fs.statSync(file).isFile());
+
+if (artifacts.length !== 1) {
+  throw new Error(`Expected exactly one VSIX to publish, found ${artifacts.length}.`);
+}
+
+const vsce = path.join(
+  root,
+  "node_modules",
+  ".bin",
+  process.platform === "win32" ? "vsce.cmd" : "vsce"
+);
+const result = spawnSync(vsce, ["publish", "--packagePath", artifacts[0]], {
+  cwd: root,
+  stdio: "inherit",
+  shell: process.platform === "win32"
+});
+if (result.error) {
+  throw result.error;
+}
+if (result.status !== 0) {
+  process.exit(result.status || 1);
+}
+
+console.log(`Published ${path.basename(artifacts[0])}.`);
diff --git a/scripts/run-compiled-tests.js b/scripts/run-compiled-tests.js
new file mode 100644
index 00000000..b94e38ad
--- /dev/null
+++ b/scripts/run-compiled-tests.js
@@ -0,0 +1,28 @@
+const { spawnSync } = require("node:child_process");
+const { readdirSync } = require("node:fs");
+const { join, resolve } = require("node:path");
+
+const testDirectory = resolve(process.argv[2]);
+function findTestFiles(directory) {
+  return readdirSync(directory, { withFileTypes: true }).flatMap(entry => {
+    const entryPath = join(directory, entry.name);
+    return entry.isDirectory()
+      ? findTestFiles(entryPath)
+      : entry.name.endsWith(".test.js")
+        ? [entryPath]
+        : [];
+  });
+}
+
+const testFiles = findTestFiles(testDirectory).sort();
+
+if (testFiles.length === 0) {
+  console.error(`No compiled test files found in ${testDirectory}`);
+  process.exit(1);
+}
+
+const result = spawnSync(process.execPath, ["--test", ...testFiles], {
+  stdio: "inherit"
+});
+
+process.exit(result.status ?? 1);
diff --git a/scripts/stage-mcp-renderer.js b/scripts/stage-mcp-renderer.js
new file mode 100644
index 00000000..bea95fcd
--- /dev/null
+++ b/scripts/stage-mcp-renderer.js
@@ -0,0 +1,39 @@
+const fs = require("node:fs");
+const path = require("node:path");
+
+const packageRoot = path.resolve(__dirname, "..");
+const rendererRoot = path.join(packageRoot, "packages", "description-renderer");
+const rendererDist = path.join(rendererRoot, "dist");
+const stagedRoot = path.join(
+  packageRoot,
+  "packages",
+  "mcp-server",
+  "dist",
+  "node_modules",
+  "codetour-description-renderer"
+);
+
+if (!fs.existsSync(rendererDist)) {
+  throw new Error(
+    "The description renderer must be built before the MCP server can be packaged."
+  );
+}
+
+fs.rmSync(stagedRoot, { recursive: true, force: true });
+fs.mkdirSync(stagedRoot, { recursive: true });
+fs.cpSync(rendererDist, path.join(stagedRoot, "dist"), { recursive: true });
+
+const rendererPackage = JSON.parse(
+  fs.readFileSync(path.join(rendererRoot, "package.json"), "utf8")
+);
+fs.writeFileSync(
+  path.join(stagedRoot, "package.json"),
+  `${JSON.stringify({
+    name: rendererPackage.name,
+    version: rendererPackage.version,
+    main: rendererPackage.main,
+    types: rendererPackage.types
+  }, null, 2)}\n`
+);
+
+console.log(`Staged ${rendererPackage.name} in the MCP package.`);
diff --git a/scripts/verify-resvg-runtime.js b/scripts/verify-resvg-runtime.js
new file mode 100644
index 00000000..3f5284e3
--- /dev/null
+++ b/scripts/verify-resvg-runtime.js
@@ -0,0 +1,19 @@
+const path = require("node:path");
+
+function fail(message) {
+  throw new Error(message);
+}
+
+const runtime = process.argv[2];
+if (!runtime) {
+  fail("Usage: node scripts/verify-resvg-runtime.js <resvg-runtime>");
+}
+
+const { Resvg } = require(path.resolve(runtime));
+const png = new Resvg(
+  '<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20"><rect width="20" height="20" fill="red"/></svg>',
+  {}
+).render().asPng();
+if (png.readUInt32BE(0) !== 0x89504e47) {
+  fail("The rasterizer did not produce a PNG.");
+}
diff --git a/scripts/verify-vsix.js b/scripts/verify-vsix.js
new file mode 100644
index 00000000..aec8adc8
--- /dev/null
+++ b/scripts/verify-vsix.js
@@ -0,0 +1,119 @@
+const fs = require("node:fs");
+const os = require("node:os");
+const path = require("node:path");
+const { spawnSync } = require("node:child_process");
+
+function fail(message) {
+  throw new Error(message);
+}
+
+function extract(artifact, destination) {
+  const result = process.platform === "win32"
+    ? spawnSync(
+        "powershell.exe",
+        [
+          "-NoProfile",
+          "-NonInteractive",
+          "-Command",
+          `Expand-Archive -LiteralPath '${artifact.replace(/'/gu, "''")}' -DestinationPath '${destination.replace(/'/gu, "''")}' -Force`
+        ],
+        { stdio: "inherit" }
+      )
+    : spawnSync("unzip", ["-q", "-o", artifact, "-d", destination], {
+        stdio: "inherit"
+      });
+  if (result.error) {
+    throw result.error;
+  }
+  if (result.status !== 0) {
+    fail(`Unable to extract ${artifact}`);
+  }
+}
+
+function listFiles(directory, prefix = "") {
+  const files = [];
+  for (const entry of fs.readdirSync(directory, { withFileTypes: true })) {
+    const relative = path.join(prefix, entry.name);
+    const fullPath = path.join(directory, entry.name);
+    if (entry.isDirectory()) {
+      files.push(...listFiles(fullPath, relative));
+    } else {
+      files.push(relative);
+    }
+  }
+  return files;
+}
+
+function verify(artifact, target) {
+  const extractionRoot = fs.mkdtempSync(path.join(os.tmpdir(), "codetour-vsix-"));
+  try {
+    extract(artifact, extractionRoot);
+    const extensionRoot = path.join(extractionRoot, "extension");
+    const files = listFiles(extensionRoot).map((file) => file.split(path.sep).join("/"));
+    if (files.some((file) => file.includes("extension-web"))) {
+      fail("The VSIX contains the removed extension-web artifact.");
+    }
+
+    const packageJson = JSON.parse(
+      fs.readFileSync(path.join(extensionRoot, "package.json"), "utf8")
+    );
+    if (packageJson.browser || packageJson.main !== "./dist/extension-node.js") {
+      fail("The VSIX package manifest is not Node-extension-only.");
+    }
+
+    const manifest = JSON.parse(
+      fs.readFileSync(path.join(extensionRoot, "dist", "resvg-runtime", "manifest.json"), "utf8")
+    );
+    if (manifest.target !== target) {
+      fail(`The VSIX runtime target is ${manifest.target}, expected ${target}.`);
+    }
+    const binary = path.join(
+      extensionRoot,
+      "dist",
+      "resvg-runtime",
+      "resvg-js",
+      manifest.binary
+    );
+    if (!fs.existsSync(binary)) {
+      fail(`The VSIX is missing its native rasterizer: ${manifest.binary}.`);
+    }
+
+    const resvg = spawnSync(
+      process.execPath,
+      [
+        path.join(__dirname, "verify-resvg-runtime.js"),
+        path.join(extensionRoot, "dist", "resvg-runtime", "resvg-js")
+      ],
+      { encoding: "utf8" }
+    );
+    if (resvg.error) {
+      throw resvg.error;
+    }
+    if (resvg.status !== 0) {
+      fail(
+        `The unpacked VSIX rasterizer did not produce a PNG: ${resvg.stderr || resvg.stdout}`
+      );
+    }
+
+    const mcp = spawnSync(
+      process.execPath,
+      [path.join(extensionRoot, "dist", "mcp-server.js"), "--version"],
+      { cwd: extensionRoot, encoding: "utf8" }
+    );
+    if (mcp.status !== 0 || !/^\d+\.\d+\.\d+/u.test((mcp.stdout || "").trim())) {
+      fail(`The unpacked MCP server did not start: ${mcp.stderr || mcp.stdout}`);
+    }
+
+    const size = fs.statSync(artifact).size;
+    console.log(`Verified unpacked ${path.basename(artifact)}: ${files.length} files, ${size} bytes, PNG OK.`);
+  } finally {
+    fs.rmSync(extractionRoot, { recursive: true, force: true });
+  }
+}
+
+const artifact = process.argv[2];
+const target = process.argv[3];
+if (!artifact || !target) {
+  fail("Usage: node scripts/verify-vsix.js <artifact.vsix> <target>");
+}
+verify(path.resolve(artifact), target);
diff --git a/skills-lock.json b/skills-lock.json
new file mode 100644
index 00000000..c85f6fe5
--- /dev/null
+++ b/skills-lock.json
@@ -0,0 +1,227 @@
+{
+  "version": 1,
+  "skills": {
+    "ask-matt": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/ask-matt/SKILL.md",
+      "computedHash": "e5404aef8525ca0c8fc76692567a38dfdd5d0cc1a9f8d47c02c18f29f60d92a6"
+    },
+    "claude-handoff": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/in-progress/claude-handoff/SKILL.md",
+      "computedHash": "c0fa5d0eede556bc7809c8461a25ec2c7db5726f338970458aa7bbf702b8ea8c"
+    },
+    "code-review": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/code-review/SKILL.md",
+      "computedHash": "b4f17857c85ca60af1df7d0b623dd03c2a48419f6123e714f3d9748ca744a1bf"
+    },
+    "codebase-design": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/codebase-design/SKILL.md",
+      "computedHash": "caea3cb8a8281ff829fd1a2b985044e77601b62f301adf43f689ccfc74c15f6f"
+    },
+    "diagnosing-bugs": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/diagnosing-bugs/SKILL.md",
+      "computedHash": "dcaaa3eb81195329f65f27574d9a67dc776160dd2e4d7798d1afb1e4a5f3695a"
+    },
+    "domain-modeling": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/domain-modeling/SKILL.md",
+      "computedHash": "336547f3ff285e822fc70b69b170dc58bceef9c8ed5fad18de0046287d6be837"
+    },
+    "git-guardrails-claude-code": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/misc/git-guardrails-claude-code/SKILL.md",
+      "computedHash": "fa22f1aa2708d95cc3149640f33e085381b184a0322609930f7971c1dca11835"
+    },
+    "grill-me": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/productivity/grill-me/SKILL.md",
+      "computedHash": "5e0c683385eafd83f106ac6c9d67dfbbfe5aa4b3fe65aad114eb1055a99c818f"
+    },
+    "grill-with-docs": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/grill-with-docs/SKILL.md",
+      "computedHash": "a610223c9796f755b603f15ec114849a4b38b9ba3006acfa9bdf3cc56dd44dad"
+    },
+    "grilling": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/productivity/grilling/SKILL.md",
+      "computedHash": "4fa026e5979770347b3357ff5139e1e41d21c3a9f7335e9cd2811cb5b8d32f2f"
+    },
+    "handoff": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/productivity/handoff/SKILL.md",
+      "computedHash": "9ea2a5de5ca2d717f913356de982fdc4fe27d28a300c16598cd43a4865491008"
+    },
+    "implement": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/implement/SKILL.md",
+      "computedHash": "130cac2d72bfde8cd526bf3b754211e2fe00e84bc4d9f9c56f749b9541a3afad"
+    },
+    "implement-spec": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/in-progress/implement-spec/SKILL.md",
+      "computedHash": "1bbece7b74c00d938ecb79e2337310d8c3c2c307b48f105026e161601b1c6be8"
+    },
+    "improve-codebase-architecture": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/improve-codebase-architecture/SKILL.md",
+      "computedHash": "016f12709bff30a27419e8add978a9be70f5ca1fb6738b3be6793038e0aba631"
+    },
+    "loop-me": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/in-progress/loop-me/SKILL.md",
+      "computedHash": "d7fbcf41b5af203a6f2a7937afaaaebdd9941b0aa4cc3654b52daec01d3fb564"
+    },
+    "migrate-to-shoehorn": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/misc/migrate-to-shoehorn/SKILL.md",
+      "computedHash": "7d31e494a384d1a5b88d1dec6e1f50e673ef1a60f7b0b6e92babfbb242f79b62"
+    },
+    "prototype": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/prototype/SKILL.md",
+      "computedHash": "62979fe039ef64407b258f8824db41b9185f788638747df803032df4153c2aae"
+    },
+    "research": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/research/SKILL.md",
+      "computedHash": "2c8b768d5f0309eaea9f92ef740101e813645b39aef88fb82733a52eae23dc0b"
+    },
+    "resolving-merge-conflicts": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/resolving-merge-conflicts/SKILL.md",
+      "computedHash": "436698459190d8e9f03dc32ada08401b56e352fb6a19bf71a2227fad8b80d98f"
+    },
+    "retro": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/in-progress/retro/SKILL.md",
+      "computedHash": "371bfc87b0fbb221e2e802e51385b5e1461c052cfa1186b18d4b441c00383eb5"
+    },
+    "scaffold-exercises": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/misc/scaffold-exercises/SKILL.md",
+      "computedHash": "0f8154a7be9fc5ebe6ae0550d520259fadfdd512c166cb7f137f8e697aae4017"
+    },
+    "setup-matt-pocock-skills": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/setup-matt-pocock-skills/SKILL.md",
+      "computedHash": "a45163cba56f72f5f224c46557c047d51547147a29e383e5a769ec39eecd1188"
+    },
+    "setup-pre-commit": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/misc/setup-pre-commit/SKILL.md",
+      "computedHash": "4ae1ad6988eb61dbc600627bc12e061215d96ced504632d00f0d9de5905eadfa"
+    },
+    "setup-ts-deep-modules": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/in-progress/setup-ts-deep-modules/SKILL.md",
+      "computedHash": "0b0e7124ad1272d59e44bcb4224275e76421351294a91480ada62234158c1023"
+    },
+    "tdd": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/tdd/SKILL.md",
+      "computedHash": "c1ed8cd854c64d4d226097255d3fa662dae4a758a1462fadd63cc10e413d88d7"
+    },
+    "teach": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/productivity/teach/SKILL.md",
+      "computedHash": "d5f74fa9a34961cf4df339019f7cd1ebf84163cf8b789829be26342e5ceba5a1"
+    },
+    "to-questionnaire": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/productivity/to-questionnaire/SKILL.md",
+      "computedHash": "e2cb00bfeb4243f1384bf7e106185ccb69fd7d45ff6a3b04bec4102f505aba31"
+    },
+    "to-spec": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/to-spec/SKILL.md",
+      "computedHash": "0ee8caf20fc7df94db53e76f42588fb01eee88c6f8dc97e7a3a0565be8978e74"
+    },
+    "to-tickets": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/to-tickets/SKILL.md",
+      "computedHash": "4aba8639f46b55ede011866f83e9e87ae10482b72c14848389e5801eba0b37bf"
+    },
+    "triage": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/triage/SKILL.md",
+      "computedHash": "363ca4f1b97ca5227d41d3973178ab301d7c498ba41b466dfe30b6163f6d72b5"
+    },
+    "wait-what": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/productivity/wait-what/SKILL.md",
+      "computedHash": "179a857fabd08c894e8e5b30baa7488147760ee1d58696ebd24bd4f6ead21699"
+    },
+    "wayfinder": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/wayfinder/SKILL.md",
+      "computedHash": "f53b17850d8d4d68e8b861cfc7de69580335851d7fe7bc3acdf37505f46c9940"
+    },
+    "wizard": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/engineering/wizard/SKILL.md",
+      "computedHash": "6b98bd36db34eb5584d937b745e6e68a317afa0807a426fe8717ab196242ae70"
+    },
+    "writing-beats": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/in-progress/writing-beats/SKILL.md",
+      "computedHash": "1d1c32479fa0774738c7baf264026e937f4a75ef7c20bd6c1b585681cadb523c"
+    },
+    "writing-for-agents": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/productivity/writing-for-agents/SKILL.md",
+      "computedHash": "831e996c177c6c5233eb3bb472a33edee2b3ce1ee5a6d7e8b696c1c3fb4eda3d"
+    },
+    "writing-fragments": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/in-progress/writing-fragments/SKILL.md",
+      "computedHash": "e97c829457cb9119aa6a636b989b3c3e273e55c9bcf27b6d281d8132e04ca972"
+    },
+    "writing-shape": {
+      "source": "mattpocock/skills",
+      "sourceType": "github",
+      "skillPath": "skills/in-progress/writing-shape/SKILL.md",
+      "computedHash": "175889218686932bda7724425b97a0a10a7679db51447c40a1a0d3a5e6f2130e"
+    }
+  }
+}
diff --git a/src/codex.ts b/src/codex.ts
new file mode 100644
index 00000000..398e4743
--- /dev/null
+++ b/src/codex.ts
@@ -0,0 +1,108 @@
+import { execFile } from "child_process";
+import { promisify } from "util";
+import * as vscode from "vscode";
+import { bundledMcpServerPath } from "./mcp";
+
+const execFileAsync = promisify(execFile);
+const CODEX_EXECUTABLE = "codex";
+const SERVER_NAME = "codetour";
+
+interface CodexServerConfiguration {
+  transport?: {
+    type?: string;
+    command?: string;
+    args?: string[];
+  };
+}
+
+async function runCodex(args: string[]): Promise<string> {
+  const result = await execFileAsync(CODEX_EXECUTABLE, args, {
+    encoding: "utf8",
+    windowsHide: true
+  });
+  return result.stdout;
+}
+
+async function currentConfiguration(): Promise<CodexServerConfiguration | undefined> {
+  try {
+    return JSON.parse(
+      await runCodex(["mcp", "get", SERVER_NAME, "--json"])
+    ) as CodexServerConfiguration;
+  } catch (error) {
+    const exitCode = (error as { code?: unknown }).code;
+    if (typeof exitCode === "number") {
+      return undefined;
+    }
+    throw error;
+  }
+}
+
+function isExpectedConfiguration(
+  configuration: CodexServerConfiguration | undefined,
+  serverPath: string
+): boolean {
+  return (
+    configuration?.transport?.type === "stdio" &&
+    configuration.transport.command === "node" &&
+    configuration.transport.args?.length === 1 &&
+    configuration.transport.args[0] === serverPath
+  );
+}
+
+async function addConfiguration(serverPath: string): Promise<void> {
+  await runCodex(["mcp", "add", SERVER_NAME, "--", "node", serverPath]);
+}
+
+async function configureCodex(context: vscode.ExtensionContext): Promise<void> {
+  const serverPath = bundledMcpServerPath(context);
+  const current = await currentConfiguration();
+  if (isExpectedConfiguration(current, serverPath)) {
+    void vscode.window.showInformationMessage("CodeTour is already configured for Codex.");
+    return;
+  }
+  if (current) {
+    const repair = "Repair configuration";
+    const selected = await vscode.window.showWarningMessage(
+      "Codex already has a different CodeTour MCP configuration.",
+      repair
+    );
+    if (selected === repair) {
+      await repairCodex(context);
+    }
+    return;
+  }
+  await addConfiguration(serverPath);
+  void vscode.window.showInformationMessage("CodeTour MCP was configured for Codex.");
+}
+
+async function repairCodex(context: vscode.ExtensionContext): Promise<void> {
+  const serverPath = bundledMcpServerPath(context);
+  const current = await currentConfiguration();
+  if (current) {
+    await runCodex(["mcp", "remove", SERVER_NAME]);
+  }
+  await addConfiguration(serverPath);
+  void vscode.window.showInformationMessage("CodeTour MCP configuration for Codex was repaired.");
+}
+
+async function reportFailure(action: () => Promise<void>): Promise<void> {
+  try {
+    await action();
+  } catch (error) {
+    const message = error instanceof Error ? error.message : String(error);
+    void vscode.window.showErrorMessage(
+      `Unable to configure CodeTour for Codex. Make sure the Codex CLI and Node.js 18 or newer are available: ${message}`
+    );
+  }
+}
+
+export function registerCodexCommands(context: vscode.ExtensionContext): void {
+  context.subscriptions.push(
+    vscode.commands.registerCommand("codetour.configureCodexMcp", () =>
+      reportFailure(() => configureCodex(context))
+    ),
+    vscode.commands.registerCommand("codetour.repairCodexMcp", () =>
+      reportFailure(() => repairCodex(context))
+    )
+  );
+}
diff --git a/src/desktopIntegration.ts b/src/desktopIntegration.ts
new file mode 100644
index 00000000..eef7b8aa
--- /dev/null
+++ b/src/desktopIntegration.ts
@@ -0,0 +1,12 @@
+import * as vscode from "vscode";
+import { registerCodexCommands } from "./codex";
+import { registerMcpProvider } from "./mcp";
+
+export function registerDesktopIntegrations(context: vscode.ExtensionContext): void {
+  if (vscode.env.uiKind !== vscode.UIKind.Desktop) {
+    return;
+  }
+
+  registerMcpProvider(context);
+  registerCodexCommands(context);
+}
diff --git a/src/extension.ts b/src/extension.ts
index b72a4b8c..c5d40060 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -5,6 +5,7 @@ import * as vscode from "vscode";
 import { initializeApi } from "./api";
 import { initializeGitApi } from "./git";
 import { registerLiveShareModule } from "./liveShare";
+import { registerNotebookProvider } from "./notebook";
 import { registerPlayerModule } from "./player";
 import { registerRecorderModule } from "./recorder";
 import { store } from "./store";
@@ -14,11 +15,12 @@ import {
   startDefaultTour
 } from "./store/actions";
 import { discoverTours as _discoverTours } from "./store/provider";
+import { registerDesktopIntegrations } from "./desktopIntegration";
 
 /**
- * In order to check whether the URI handler was called on activation,
- * we must do this dance around `discoverTours`. The same call to
- * `discoverTours` is shared between `activate` and the URI handler.
+ * Partage la découverte des visites entre l'ouverture normale du projet et
+ * l'ouverture via un lien CodeTour. Une seule lecture des fichiers est ainsi
+ * nécessaire avant d'afficher la visite demandée à l'utilisateur.
  */
 let cachedDiscoverTours: Promise<void> | undefined;
 function discoverTours(): Promise<void> {
@@ -31,8 +33,8 @@ function startTour(params: URLSearchParams) {
 
   let stepNumber;
   if (step) {
-    // Allow the step number to be
-    // provided as 1-based vs. 0-based
+    // Dans les liens publics, la première étape porte le numéro 1 ; le lecteur
+    // interne utilise un index qui commence à 0.
     stepNumber = Number(step) - 1;
   }
 
@@ -75,6 +77,11 @@ class URIHandler implements vscode.UriHandler {
 }
 
 export async function activate(context: vscode.ExtensionContext) {
+  registerDesktopIntegrations(context);
+  const notebookProvider = registerNotebookProvider();
+  if (notebookProvider) {
+    context.subscriptions.push(notebookProvider);
+  }
   registerPlayerModule(context);
   registerRecorderModule();
   registerLiveShareModule();
diff --git a/src/mcp.ts b/src/mcp.ts
new file mode 100644
index 00000000..25164a80
--- /dev/null
+++ b/src/mcp.ts
@@ -0,0 +1,29 @@
+import * as path from "path";
+import * as vscode from "vscode";
+
+export const MCP_PROVIDER_ID = "codetour.tour-generator";
+
+export function bundledMcpServerPath(context: vscode.ExtensionContext): string {
+  return path.join(context.extensionPath, "dist", "mcp-server.js");
+}
+
+export function registerMcpProvider(context: vscode.ExtensionContext): void {
+  const serverPath = bundledMcpServerPath(context);
+  const extensionVersion = String(context.extension.packageJSON.version);
+  context.subscriptions.push(
+    vscode.lm.registerMcpServerDefinitionProvider(MCP_PROVIDER_ID, {
+      provideMcpServerDefinitions: () =>
+        (vscode.workspace.workspaceFolders ?? []).map(folder => {
+          const definition = new vscode.McpStdioServerDefinition(
+            `CodeTour (${folder.name})`,
+            process.execPath,
+            [serverPath],
+            { ELECTRON_RUN_AS_NODE: "1" },
+            extensionVersion
+          );
+          definition.cwd = folder.uri;
+          return definition;
+        })
+    })
+  );
+}
diff --git a/src/notebook/index.ts b/src/notebook/index.ts
index 439c080f..2bdd103e 100644
--- a/src/notebook/index.ts
+++ b/src/notebook/index.ts
@@ -3,6 +3,7 @@
 
 import * as vscode from "vscode";
 import { EXTENSION_NAME, SMALL_ICON_URL } from "../constants";
+import { renderPreviewDescription } from "../player/description";
 import { CodeTour } from "../store";
 import { getStepFileUri, getWorkspaceUri } from "../utils";
 
@@ -35,20 +36,31 @@ class CodeTourNotebookProvider implements vscode.NotebookSerializer {
       steps.push({
         contents,
         language: document.languageId,
-        description: item.description,
+        description: await renderPreviewDescription(item.description, undefined, {
+          tour,
+          workspaceRoot
+        }),
         uri
       });
     }
 
     let cells: vscode.NotebookCellData[] = [];
 
+    const titleDescription =
+      tour.description === undefined
+        ? ""
+        : await renderPreviewDescription(tour.description, undefined, {
+            tour,
+            workspaceRoot
+          });
+
     // Title cell
     cells.push(
       new vscode.NotebookCellData(
         1,
         `## ![Icon](${SMALL_ICON_URL})&nbsp;&nbsp; CodeTour (${tour.title}) - ${
           steps.length
-        } steps\n\n${tour.description === undefined ? "" : tour.description}`,
+        } steps\n\n${titleDescription}`,
         "markdown"
       )
     );
@@ -67,6 +79,7 @@ class CodeTourNotebookProvider implements vscode.NotebookSerializer {
           )
         ])
       ];
+      cells.push(cell);
     });
 
     return new vscode.NotebookData(cells);
@@ -80,8 +93,12 @@ class CodeTourNotebookProvider implements vscode.NotebookSerializer {
   }
 }
 
-export function registerNotebookProvider() {
-  vscode.notebook.registerNotebookSerializer(
+export function registerNotebookProvider(): vscode.Disposable | undefined {
+  if (typeof vscode.notebook === "undefined") {
+    return undefined;
+  }
+
+  return vscode.notebook.registerNotebookSerializer(
     EXTENSION_NAME,
     new CodeTourNotebookProvider()
   );
diff --git a/src/player/commands.ts b/src/player/commands.ts
index 6bf7bbb5..fcb2d1ba 100644
--- a/src/player/commands.ts
+++ b/src/player/commands.ts
@@ -21,8 +21,24 @@ import { CodeTourNode } from "./tree/nodes";
 
 let terminal: vscode.Terminal | null;
 export function registerPlayerCommands() {
-  // This is a "private" command that's used exclusively
-  // by the hover description for tour markers.
+  // Internal inspection seam used by the development-host smoke test. It
+  // reads the comment owned by the active player, not a renderer-side value.
+  vscode.commands.registerCommand(
+    `${EXTENSION_NAME}._getActiveCommentBody`,
+    () => {
+      const comment = store.activeTour?.thread?.comments[0];
+      if (!comment) {
+        return undefined;
+      }
+
+      return comment.body instanceof vscode.MarkdownString
+        ? comment.body.value
+        : comment.body;
+    }
+  );
+
+  // Permet à l'aperçu d'un marqueur d'ouvrir directement la visite et l'étape
+  // correspondantes ; cette commande n'est pas destinée à la palette publique.
   vscode.commands.registerCommand(
     `${EXTENSION_NAME}._startTourById`,
     async (id: string, stepNumber: number) => {
@@ -33,7 +49,7 @@ export function registerPlayerCommands() {
     }
   );
 
-  // Purpose: Command link
+  // Ouvre une visite liée depuis le contenu Markdown d'une autre visite.
   vscode.commands.registerCommand(
     `${EXTENSION_NAME}.startTourByTitle`,
     async (title: string, stepNumber?: number) => {
@@ -68,7 +84,7 @@ export function registerPlayerCommands() {
     }
   );
 
-  // Purpose: Command link
+  // Amène le lecteur à l'étape ciblée par un lien Markdown.
   vscode.commands.registerCommand(
     `${EXTENSION_NAME}.navigateToStep`,
     async (stepNumber: number) => {
@@ -83,7 +99,7 @@ export function registerPlayerCommands() {
     }
   );
 
-  // Purpose: Command link and the ">>" syntax
+  // Exécute dans le terminal CodeTour le texte proposé par une étape.
   vscode.commands.registerCommand(
     `${EXTENSION_NAME}.sendTextToTerminal`,
     async (text: string) => {
diff --git a/src/player/description.ts b/src/player/description.ts
new file mode 100644
index 00000000..b0028663
--- /dev/null
+++ b/src/player/description.ts
@@ -0,0 +1,112 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+import { ColorThemeKind, Uri, window, workspace } from "vscode";
+import {
+  DescriptionTheme,
+  renderDescription
+} from "codetour-description-renderer";
+import { CodeTour, store } from "../store";
+import { getTourTitle } from "../utils";
+import { appendInsertCodeLinks } from "./insertCode";
+
+const SHELL_SCRIPT_PATTERN = /^>>\s+(?<script>.*)$/gm;
+
+const COMMAND_PATTERN =
+  /(?<commandPrefix>\(command:[\w+\.]+\?)(?<params>\[[^\]\)]+\])/gm;
+
+const TOUR_REFERENCE_PATTERN =
+  /(?:\[(?<linkTitle>[^\]]+)\])?\[(?=\s*[^\]\s])(?<tourTitle>[^\]#]+)?(?:#(?<stepNumber>\d+))?\](?!\()/gm;
+const FILE_REFERENCE_PATTERN = /(\!)?(\[[^\]]+\]\()(\.[^\)]+)(?=\))/gm;
+
+export interface PreviewDescriptionContext {
+  tour?: CodeTour;
+  tours?: CodeTour[];
+  workspaceRoot?: Uri;
+}
+
+export function getDescriptionTheme(): DescriptionTheme {
+  const kind = window.activeColorTheme.kind;
+  return kind === ColorThemeKind.Dark || kind === ColorThemeKind.HighContrast
+    ? "dark"
+    : "light";
+}
+
+export function generatePreviewContent(
+  content: string,
+  context: PreviewDescriptionContext = {}
+) {
+  const transformed = content
+    .replace(SHELL_SCRIPT_PATTERN, (_, script) => {
+      const args = encodeURIComponent(JSON.stringify([script]));
+      const s = `> [${script}](command:codetour.sendTextToTerminal?${args} "Run \\"${script.replace(
+        /"/g,
+        "'"
+      )}\\" in a terminal")`;
+      return s;
+    })
+    .replace(COMMAND_PATTERN, (_, commandPrefix, params) => {
+      const args = encodeURIComponent(JSON.stringify(JSON.parse(params)));
+      return `${commandPrefix}${args}`;
+    })
+    .replace(FILE_REFERENCE_PATTERN, (_, isImage, prefix, filePath) => {
+      const activeTour = context.tour || store.activeTour?.tour;
+      const workspaceUri =
+        context.workspaceRoot ||
+        (activeTour
+          ? workspace.getWorkspaceFolder(Uri.parse(activeTour.id))?.uri
+          : undefined);
+
+      if (!workspaceUri) {
+        return _;
+      }
+
+      const fileUri = Uri.joinPath(workspaceUri, filePath);
+
+      if (isImage) {
+        return `!${prefix}${fileUri.toString()}`;
+      } else {
+        const args = encodeURIComponent(JSON.stringify([fileUri]));
+        return `${prefix}command:vscode.open?${args} "Open ${filePath}"`;
+      }
+    })
+    .replace(TOUR_REFERENCE_PATTERN, (_, linkTitle, tourTitle, stepNumber) => {
+      if (!tourTitle) {
+        const title = linkTitle || `#${stepNumber}`;
+        return `[${title}](command:codetour.navigateToStep?${stepNumber} "Navigate to step #${stepNumber}")`;
+      }
+
+      const tours = context.tours || store.activeTour?.tours || store.tours;
+      const tour = tours.find(tour => getTourTitle(tour) === tourTitle);
+      if (tour) {
+        const args: [string, number?] = [tour.title];
+
+        if (stepNumber) {
+          args.push(Number(stepNumber));
+        }
+        const argsContent = encodeURIComponent(JSON.stringify(args));
+        const title = linkTitle || tour.title;
+        return `[${title}](command:codetour.startTourByTitle?${argsContent} "Start \\"${tour.title}\\" tour")`;
+      }
+
+      return _;
+    });
+
+  return appendInsertCodeLinks(transformed);
+}
+
+/**
+ * Produces the Markdown consumed by every playback surface. Mermaid rendering
+ * must happen before preview transformations so the source fence cannot be
+ * mistaken for insertable code.
+ */
+export async function renderPreviewDescription(
+  content: string,
+  theme: DescriptionTheme = getDescriptionTheme(),
+  context: PreviewDescriptionContext = {}
+): Promise<string> {
+  return generatePreviewContent(
+    await renderDescription(content, theme),
+    context
+  );
+}
diff --git a/src/player/index.ts b/src/player/index.ts
index 2e5935b0..30facd2b 100644
--- a/src/player/index.ts
+++ b/src/player/index.ts
@@ -21,6 +21,7 @@ import {
   window,
   workspace
 } from "vscode";
+import { clearMermaidRenderCache } from "codetour-description-renderer";
 import { SMALL_ICON_URL } from "../constants";
 import { CodeTour, store } from "../store";
 import { initializeStorage } from "../store/storage";
@@ -37,6 +38,7 @@ import { registerPlayerCommands } from "./commands";
 import { registerDecorators } from "./decorator";
 import { registerFileSystemProvider } from "./fileSystem";
 import { registerTextDocumentContentProvider } from "./fileSystem/documentProvider";
+import { renderPreviewDescription } from "./description";
 import { registerStatusBar } from "./status";
 import { registerTreeProvider } from "./tree";
 
@@ -44,71 +46,9 @@ const CONTROLLER_ID = "codetour";
 const CONTROLLER_LABEL = "CodeTour";
 
 let id = 0;
+let renderRequest = 0;
 
-const SHELL_SCRIPT_PATTERN = /^>>\s+(?<script>.*)$/gm;
-
-const COMMAND_PATTERN =
-  /(?<commandPrefix>\(command:[\w+\.]+\?)(?<params>\[[^\]\)]+\])/gm;
-
-const TOUR_REFERENCE_PATTERN =
-  /(?:\[(?<linkTitle>[^\]]+)\])?\[(?=\s*[^\]\s])(?<tourTitle>[^\]#]+)?(?:#(?<stepNumber>\d+))?\](?!\()/gm;
-const FILE_REFERENCE_PATTERN = /(\!)?(\[[^\]]+\]\()(\.[^\)]+)(?=\))/gm;
-const CODE_FENCE_PATTERN = /```[^\n]+\n(.+)\n```/gms;
-
-export function generatePreviewContent(content: string) {
-  return content
-    .replace(SHELL_SCRIPT_PATTERN, (_, script) => {
-      const args = encodeURIComponent(JSON.stringify([script]));
-      const s = `> [${script}](command:codetour.sendTextToTerminal?${args} "Run \\"${script.replace(
-        /"/g,
-        "'"
-      )}\\" in a terminal")`;
-      return s;
-    })
-    .replace(COMMAND_PATTERN, (_, commandPrefix, params) => {
-      const args = encodeURIComponent(JSON.stringify(JSON.parse(params)));
-      return `${commandPrefix}${args}`;
-    })
-    .replace(FILE_REFERENCE_PATTERN, (_, isImage, prefix, filePath) => {
-      const workspaceUri = workspace.getWorkspaceFolder(
-        Uri.parse(store.activeTour!.tour.id)
-      )!.uri;
-      const fileUri = Uri.joinPath(workspaceUri, filePath);
-
-      if (isImage) {
-        return `!${prefix}${fileUri.toString()}`;
-      } else {
-        const args = encodeURIComponent(JSON.stringify([fileUri]));
-        return `${prefix}command:vscode.open?${args} "Open ${filePath}"`;
-      }
-    })
-    .replace(TOUR_REFERENCE_PATTERN, (_, linkTitle, tourTitle, stepNumber) => {
-      if (!tourTitle) {
-        const title = linkTitle || `#${stepNumber}`;
-        return `[${title}](command:codetour.navigateToStep?${stepNumber} "Navigate to step #${stepNumber}")`;
-      }
-
-      const tours = store.activeTour?.tours || store.tours;
-      const tour = tours.find(tour => getTourTitle(tour) === tourTitle);
-      if (tour) {
-        const args: [string, number?] = [tour.title];
-
-        if (stepNumber) {
-          args.push(Number(stepNumber));
-        }
-        const argsContent = encodeURIComponent(JSON.stringify(args));
-        const title = linkTitle || tour.title;
-        return `[${title}](command:codetour.startTourByTitle?${argsContent} "Start \\"${tour.title}\\" tour")`;
-      }
-
-      return _;
-    })
-    .replace(CODE_FENCE_PATTERN, (_, codeBlock) => {
-      const params = encodeURIComponent(JSON.stringify([codeBlock]));
-      return `${_}
-↪ [Insert Code](command:codetour.insertCodeSnippet?${params} "Insert Code")`;
-    });
-}
+export { generatePreviewContent } from "./description";
 
 export class CodeTourComment implements Comment {
   public id: string = (++id).toString();
@@ -125,10 +65,7 @@ export class CodeTourComment implements Comment {
     public parent: CommentThread,
     public mode: CommentMode
   ) {
-    const body =
-      mode === CommentMode.Preview ? generatePreviewContent(content) : content;
-
-    this.body = new MarkdownString(body);
+    this.body = new MarkdownString(content);
     this.body.isTrusted = true;
   }
 }
@@ -136,7 +73,11 @@ export class CodeTourComment implements Comment {
 let controller: CommentController | null;
 
 export async function focusPlayer() {
-  const currentThread = store.activeTour!.thread!;
+  const currentThread = store.activeTour?.thread;
+  if (!currentThread?.range) {
+    return;
+  }
+
   showDocument(currentThread.uri, currentThread.range);
 }
 
@@ -229,12 +170,22 @@ function getNextTour(): CodeTour | undefined {
 }
 
 async function renderCurrentStep() {
-  if (store.activeTour!.thread) {
-    store.activeTour!.thread.dispose();
+  const request = ++renderRequest;
+  const activeTour = store.activeTour;
+  if (!activeTour) {
+    return;
   }
 
-  const currentTour = store.activeTour!.tour;
-  const currentStep = store.activeTour!.step;
+  if (activeTour.thread) {
+    activeTour.thread.dispose();
+  }
+
+  const currentTour = activeTour.tour;
+  const currentStep = activeTour.step;
+  const isCurrentRequest = () =>
+    request === renderRequest &&
+    store.activeTour === activeTour &&
+    activeTour.step === currentStep;
 
   const step = currentTour!.steps[currentStep];
   if (!step) {
@@ -243,6 +194,9 @@ async function renderCurrentStep() {
 
   const workspaceRoot = store.activeTour?.workspaceRoot;
   const uri = await getStepFileUri(step, workspaceRoot, currentTour.ref);
+  if (!isCurrentRequest()) {
+    return;
+  }
 
   let line = step.line
     ? step.line - 1
@@ -254,6 +208,9 @@ async function renderCurrentStep() {
     const stepPattern = step.pattern || getActiveStepMarker();
     if (stepPattern) {
       const document = await workspace.openTextDocument(uri);
+      if (!isCurrentRequest()) {
+        return;
+      }
       const match = document.getText().match(new RegExp(stepPattern, "m"));
       if (match) {
         line = document.positionAt(match.index!).line;
@@ -262,9 +219,8 @@ async function renderCurrentStep() {
   }
 
   if (line === undefined) {
-    // The step doesn't have a discoverable line number and so
-    // stick the step at the end of the file. Unfortunately, there
-    // isn't a way to say EOF, so 2000 is a temporary hack.
+    // Sans ligne ni motif retrouvable, l'étape décrit le fichier dans son
+    // ensemble ; son commentaire est donc placé visuellement en fin de fichier.
     line = 2000;
   }
 
@@ -276,13 +232,29 @@ async function renderCurrentStep() {
     label += ` (${title})`;
   }
 
-  store.activeTour!.thread = controller!.createCommentThread(uri, range, []);
+  if (!isCurrentRequest()) {
+    return;
+  }
+
+  const thread = controller!.createCommentThread(uri, range, []);
+  activeTour.thread = thread;
 
   const mode =
     store.isRecording && store.isEditing
       ? CommentMode.Editing
       : CommentMode.Preview;
   let content = step.description;
+  if (mode === CommentMode.Preview) {
+    content = await renderPreviewDescription(content, undefined, {
+      tour: currentTour,
+      tours: activeTour.tours,
+      workspaceRoot
+    });
+  }
+  if (!isCurrentRequest()) {
+    thread.dispose();
+    return;
+  }
 
   let hasPreviousStep = currentStep > 0;
   const hasNextStep = currentStep < currentTour.steps.length - 1;
@@ -341,13 +313,18 @@ async function renderCurrentStep() {
   const comment = new CodeTourComment(
     content,
     label,
-    store.activeTour!.thread!,
+    thread,
     mode
   );
 
+  if (!isCurrentRequest()) {
+    thread.dispose();
+    return;
+  }
+
   // @ts-ignore
-  store.activeTour!.thread.canReply = false;
-  store.activeTour!.thread.comments = [comment];
+  thread.canReply = false;
+  thread.comments = [comment];
 
   const contextValues = [];
   if (hasPreviousStep) {
@@ -358,15 +335,14 @@ async function renderCurrentStep() {
     contextValues.push("hasNext");
   }
 
-  store.activeTour!.thread.contextValue = contextValues.join(".");
-  store.activeTour!.thread.collapsibleState =
+  thread.contextValue = contextValues.join(".");
+  thread.collapsibleState =
     CommentThreadCollapsibleState.Expanded;
 
   let selection;
   if (step.selection) {
-    // Adjust the 1-based positions
-    // to the 0-based positions that
-    // VS Code's editor uses.
+    // Les fichiers .tour utilisent des positions lisibles commençant à 1,
+    // tandis que VS Code attend des positions commençant à 0.
     selection = new Selection(
       step.selection.start.line - 1,
       step.selection.start.character - 1,
@@ -435,7 +411,14 @@ async function showDocument(uri: Uri, range: Range, selection?: Selection) {
 
 export function registerPlayerModule(context: ExtensionContext) {
   registerPlayerCommands();
-  registerTreeProvider(context.extensionPath);
+  context.subscriptions.push(
+    registerTreeProvider(context.extensionPath, () => {
+      clearMermaidRenderCache();
+      if (store.activeTour && !store.isEditing) {
+        renderCurrentStep();
+      }
+    })
+  );
   registerFileSystemProvider();
   registerTextDocumentContentProvider();
   registerStatusBar();
@@ -444,8 +427,8 @@ export function registerPlayerModule(context: ExtensionContext) {
 
   initializeStorage(context);
 
-  // Watch for changes to the active tour property,
-  // and automatically re-render the current step in response.
+  // Toute navigation ou modification de la visite rafraîchit automatiquement
+  // l'étape visible, pour que le commentaire reste synchronisé avec le fichier.
   reaction(
     () => [
       store.activeTour
diff --git a/src/player/insertCode.test.ts b/src/player/insertCode.test.ts
new file mode 100644
index 00000000..981b2809
--- /dev/null
+++ b/src/player/insertCode.test.ts
@@ -0,0 +1,201 @@
+import { test } from "node:test";
+import * as assert from "node:assert";
+import { appendInsertCodeLinks } from "./insertCode";
+
+// The transformation that AppendInsertCodeLinks must preserve verbatim for
+// descriptions that contain no Mermaid fence.
+const LEGACY_CODE_FENCE_PATTERN = /```[^\n]+\n(.+)\n```/gms;
+
+function legacyTransform(content: string): string {
+  return content.replace(
+    LEGACY_CODE_FENCE_PATTERN,
+    (_, codeBlock) =>
+      `${_}\n↪ [Insert Code](command:codetour.insertCodeSnippet?${encodeURIComponent(
+        JSON.stringify([codeBlock])
+      )} "Insert Code")`
+  );
+}
+
+function insertCodeLink(codeBlock: string): string {
+  return `↪ [Insert Code](command:codetour.insertCodeSnippet?${encodeURIComponent(
+    JSON.stringify([codeBlock])
+  )} "Insert Code")`;
+}
+
+test("appendInsertCodeLinks leaves content without code fences unchanged", () => {
+  const content = "Just some prose\nwith no fences at all.";
+
+  assert.equal(appendInsertCodeLinks(content), content);
+});
+
+test("appendInsertCodeLinks appends an Insert Code link to an ordinary fence", () => {
+  const content = ["Intro", "", "```ts", "const answer = 42;", "```", "", "Outro"].join("\n");
+
+  assert.equal(
+    appendInsertCodeLinks(content),
+    [
+      "Intro",
+      "",
+      "```ts",
+      "const answer = 42;",
+      "```",
+      insertCodeLink("const answer = 42;"),
+      "",
+      "Outro"
+    ].join("\n")
+  );
+});
+
+test("appendInsertCodeLinks preserves the existing behavior for ordinary fences", () => {
+  const cases = [
+    "```ts\nconst a = 1;\n```",
+    "```ts\nconst a = 1;\n```\n\n```js\nconst b = 2;\n```",
+    "```\nno info string\n```",
+    "text before\n```python\nx = 1\n```\ntext between\n```js\ny = 2\n```\ntext after",
+    "```ts\nunterminated fence"
+  ];
+
+  for (const content of cases) {
+    assert.equal(
+      appendInsertCodeLinks(content),
+      legacyTransform(content),
+      content
+    );
+  }
+});
+
+test("appendInsertCodeLinks bypasses a Mermaid fence", () => {
+  const content = [
+    "**Diagram — Request lifecycle**",
+    "",
+    "```mermaid",
+    "flowchart TD",
+    "    Client --> Gateway",
+    "```"
+  ].join("\n");
+
+  assert.equal(appendInsertCodeLinks(content), content);
+});
+
+test("appendInsertCodeLinks bypasses a padded Mermaid fence", () => {
+  const content = ["```mermaid  ", "flowchart TD", "    A --> B", "```"].join("\n");
+
+  assert.equal(appendInsertCodeLinks(content), content);
+});
+
+test("appendInsertCodeLinks keeps an ordinary fence insertable before a Mermaid fence", () => {
+  const content = [
+    "```ts",
+    "const a = 1;",
+    "```",
+    "",
+    "**Diagram — Flow**",
+    "",
+    "```mermaid",
+    "flowchart TD",
+    "    A --> B",
+    "```"
+  ].join("\n");
+
+  assert.equal(
+    appendInsertCodeLinks(content),
+    [
+      "```ts",
+      "const a = 1;",
+      "```",
+      insertCodeLink("const a = 1;"),
+      "",
+      "**Diagram — Flow**",
+      "",
+      "```mermaid",
+      "flowchart TD",
+      "    A --> B",
+      "```"
+    ].join("\n")
+  );
+});
+
+test("appendInsertCodeLinks does not let a Mermaid fence swallow the next fence", () => {
+  const content = [
+    "```mermaid",
+    "flowchart TD",
+    "    A --> B",
+    "```",
+    "",
+    "```ts",
+    "const a = 1;",
+    "```"
+  ].join("\n");
+
+  assert.equal(
+    appendInsertCodeLinks(content),
+    [
+      "```mermaid",
+      "flowchart TD",
+      "    A --> B",
+      "```",
+      "",
+      "```ts",
+      "const a = 1;",
+      "```",
+      insertCodeLink("const a = 1;")
+    ].join("\n")
+  );
+});
+
+test("appendInsertCodeLinks splits a run of ordinary fences around a Mermaid fence", () => {
+  const content = [
+    "```ts",
+    "const a = 1;",
+    "```",
+    "```js",
+    "const b = 2;",
+    "```",
+    "```mermaid",
+    "flowchart TD",
+    "    A --> B",
+    "```",
+    "```python",
+    "x = 1",
+    "```"
+  ].join("\n");
+
+  assert.equal(
+    appendInsertCodeLinks(content),
+    [
+      "```ts",
+      "const a = 1;",
+      "```",
+      "```js",
+      "const b = 2;",
+      "```",
+      insertCodeLink("const a = 1;\n```\n```js\nconst b = 2;"),
+      "```mermaid",
+      "flowchart TD",
+      "    A --> B",
+      "```",
+      "```python",
+      "x = 1",
+      "```",
+      insertCodeLink("x = 1")
+    ].join("\n")
+  );
+});
+
+test("appendInsertCodeLinks treats other info strings as ordinary fences", () => {
+  for (const info of ["Mermaid", "mermaidjs", "mermaid example"]) {
+    const content = "```" + info + "\ncode\n```";
+
+    assert.equal(
+      appendInsertCodeLinks(content),
+      content + "\n" + insertCodeLink("code"),
+      info
+    );
+  }
+});
+
+test("appendInsertCodeLinks leaves an unterminated fence without a link", () => {
+  const content = "```ts\nconst a = 1;";
+
+  assert.equal(appendInsertCodeLinks(content), content);
+});
diff --git a/src/player/insertCode.ts b/src/player/insertCode.ts
new file mode 100644
index 00000000..414d63bb
--- /dev/null
+++ b/src/player/insertCode.ts
@@ -0,0 +1,100 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+// Transforms the code fences of a preview description into Insert Code links.
+// Mermaid fences are bypassed, so diagram sources are never offered as
+// insertable code and never swallowed into another fence's payload.
+
+const CODE_FENCE_PATTERN = /```[^\n]+\n(.+)\n```/gms;
+const FENCE_OPEN_PATTERN = /^\s*```(.+)$/;
+const FENCE_CLOSE_PATTERN = /^\s*```[ \t]*$/;
+const MERMAID_FENCE_PATTERN = /^\s*```mermaid[ \t]*$/;
+
+interface FenceSpan {
+  openIndex: number;
+  closeIndex: number;
+  isMermaid: boolean;
+}
+
+function insertCodeLink(codeBlock: string): string {
+  const params = encodeURIComponent(JSON.stringify([codeBlock]));
+  return `↪ [Insert Code](command:codetour.insertCodeSnippet?${params} "Insert Code")`;
+}
+
+function transformLegacy(content: string): string {
+  return content.replace(CODE_FENCE_PATTERN, (_, codeBlock) =>
+    `${_}\n${insertCodeLink(codeBlock)}`
+  );
+}
+
+function findFenceSpans(lines: string[]): FenceSpan[] {
+  const spans: FenceSpan[] = [];
+
+  let index = 0;
+  while (index < lines.length) {
+    if (!FENCE_OPEN_PATTERN.test(lines[index])) {
+      index++;
+      continue;
+    }
+
+    let closeIndex = -1;
+    for (let candidate = index + 1; candidate < lines.length; candidate++) {
+      if (FENCE_CLOSE_PATTERN.test(lines[candidate])) {
+        closeIndex = candidate;
+        break;
+      }
+    }
+
+    if (closeIndex === -1) {
+      break;
+    }
+
+    spans.push({
+      openIndex: index,
+      closeIndex,
+      isMermaid: MERMAID_FENCE_PATTERN.test(lines[index])
+    });
+    index = closeIndex + 1;
+  }
+
+  return spans;
+}
+
+function transformFenceRuns(content: string): string {
+  const lines = content.split("\n");
+  const spans = findFenceSpans(lines);
+
+  const output: string[] = [];
+  let cursor = 0;
+
+  for (let index = 0; index < spans.length; index++) {
+    const span = spans[index];
+    if (span.isMermaid) {
+      continue;
+    }
+
+    let last = span;
+    while (index + 1 < spans.length && !spans[index + 1].isMermaid) {
+      index++;
+      last = spans[index];
+    }
+
+    output.push(...lines.slice(cursor, span.openIndex));
+    output.push(...lines.slice(span.openIndex, last.closeIndex + 1));
+    output.push(
+      insertCodeLink(lines.slice(span.openIndex + 1, last.closeIndex).join("\n"))
+    );
+    cursor = last.closeIndex + 1;
+  }
+
+  output.push(...lines.slice(cursor));
+  return output.join("\n");
+}
+
+export function appendInsertCodeLinks(content: string): string {
+  if (!content.includes("```mermaid")) {
+    return transformLegacy(content);
+  }
+
+  return transformFenceRuns(content);
+}
diff --git a/src/player/tree/index.ts b/src/player/tree/index.ts
index bd143402..e975fc1f 100644
--- a/src/player/tree/index.ts
+++ b/src/player/tree/index.ts
@@ -12,9 +12,9 @@ import {
   window
 } from "vscode";
 import { EXTENSION_NAME } from "../../constants";
-import { generatePreviewContent } from "..";
 import { store } from "../../store";
 import { CodeTourNode, CodeTourStepNode } from "./nodes";
+import { renderPreviewDescription } from "../description";
 
 class CodeTourTreeProvider implements TreeDataProvider<TreeItem>, Disposable {
   private _disposables: Disposable[] = [];
@@ -53,6 +53,10 @@ class CodeTourTreeProvider implements TreeDataProvider<TreeItem>, Disposable {
 
   getTreeItem = (node: TreeItem) => node;
 
+  refresh() {
+    this._onDidChangeTreeData.fire(undefined);
+  }
+
   async getChildren(element?: TreeItem): Promise<TreeItem[] | undefined> {
     if (!element) {
       if (!store.hasTours && !store.activeTour) {
@@ -104,12 +108,46 @@ class CodeTourTreeProvider implements TreeDataProvider<TreeItem>, Disposable {
     }
   }
 
-  // This is called whenever a tree item is hovered over, and we're
-  // using it to generate preview tooltips for tour steps on-demand.
+  // Au survol d'une étape, affiche un aperçu de son explication sans obliger
+  // l'utilisateur à quitter la vue d'ensemble de la visite.
   async resolveTreeItem(element: TreeItem): Promise<TreeItem> {
-    if (element instanceof CodeTourStepNode) {
-      const content = generatePreviewContent(
-        element.tour.steps[element.stepNumber].description
+    if (element instanceof CodeTourNode && element.tour.description) {
+      const content = await renderPreviewDescription(
+        element.tour.description,
+        undefined,
+        {
+          tour: element.tour,
+          tours:
+            element.tour === store.activeTour?.tour
+              ? store.activeTour.tours
+              : undefined,
+          workspaceRoot:
+            element.tour === store.activeTour?.tour
+              ? store.activeTour.workspaceRoot
+              : undefined
+        }
+      );
+
+      const tooltip = new MarkdownString(content);
+      tooltip.isTrusted = true;
+
+      // @ts-ignore
+      element.tooltip = tooltip;
+    } else if (element instanceof CodeTourStepNode) {
+      const content = await renderPreviewDescription(
+        element.tour.steps[element.stepNumber].description,
+        undefined,
+        {
+          tour: element.tour,
+          tours:
+            element.tour === store.activeTour?.tour
+              ? store.activeTour.tours
+              : undefined,
+          workspaceRoot:
+            element.tour === store.activeTour?.tour
+              ? store.activeTour.workspaceRoot
+              : undefined
+        }
       );
 
       const tooltip = new MarkdownString(content);
@@ -127,7 +165,10 @@ class CodeTourTreeProvider implements TreeDataProvider<TreeItem>, Disposable {
   }
 }
 
-export function registerTreeProvider(extensionPath: string) {
+export function registerTreeProvider(
+  extensionPath: string,
+  onThemeChanged: () => void
+): Disposable {
   const treeDataProvider = new CodeTourTreeProvider(extensionPath);
   const treeView = window.createTreeView(`${EXTENSION_NAME}.tours`, {
     showCollapseAll: true,
@@ -135,6 +176,11 @@ export function registerTreeProvider(extensionPath: string) {
     canSelectMany: true
   });
 
+  const themeChange = window.onDidChangeActiveColorTheme(() => {
+    onThemeChanged();
+    treeDataProvider.refresh();
+  });
+
   let isRevealPending = false;
   treeView.onDidChangeVisibility(e => {
     if (e.visible && isRevealPending) {
@@ -179,4 +225,12 @@ export function registerTreeProvider(extensionPath: string) {
       }
     }
   );
+
+  return {
+    dispose() {
+      themeChange.dispose();
+      treeView.dispose();
+      treeDataProvider.dispose();
+    }
+  };
 }
diff --git a/src/player/tree/nodes.ts b/src/player/tree/nodes.ts
index be9368d3..b46dcbf3 100644
--- a/src/player/tree/nodes.ts
+++ b/src/player/tree/nodes.ts
@@ -36,7 +36,6 @@ export class CodeTourNode extends TreeItem {
         : TreeItemCollapsibleState.Collapsed
     );
 
-    this.tooltip = tour.description;
     this.description = `${tour.steps.length} steps`;
 
     const contextValues = ["codetour.tour"];
diff --git a/src/recorder/commands.ts b/src/recorder/commands.ts
index f9d782c7..96eba150 100644
--- a/src/recorder/commands.ts
+++ b/src/recorder/commands.ts
@@ -8,6 +8,7 @@ import { workspace } from "vscode";
 import { EXTENSION_NAME, FS_SCHEME_CONTENT } from "../constants";
 import { api, RefType } from "../git";
 import { CodeTourComment } from "../player";
+import { renderPreviewDescription } from "../player/description";
 import { CodeTourNode, CodeTourStepNode } from "../player/tree/nodes";
 import { CodeTour, CodeTourStep, store } from "../store";
 import {
@@ -373,6 +374,10 @@ export function registerRecorderCommands() {
 
       const tour = store.activeTour!.tour;
       const thread = store.activeTour!.thread;
+      const range = thread.range;
+      if (!range) {
+        throw new Error("A file Tour step requires a source range.");
+      }
 
       const workspaceRoot = getActiveWorkspacePath();
       const file = getRelativePath(workspaceRoot, thread!.uri.path);
@@ -391,7 +396,7 @@ export function registerRecorderCommands() {
           editor => editor.document && editor.document.uri.scheme === "file"
         );
         const contents = fileEditors?.[0]?.document
-          .lineAt(thread.range.start.line)
+          .lineAt(range.start.line)
           .text.trim();
 
         const pattern =
@@ -407,10 +412,10 @@ export function registerRecorderCommands() {
           step.pattern = pattern;
         } else {
           // TODO: Try to get smarter about how to handle this.
-          step.line = thread.range.start.line + 1;
+          step.line = range.start.line + 1;
         }
       } else {
-        step.line = thread.range.start.line + 1;
+        step.line = range.start.line + 1;
       }
 
       store.activeTour!.step++;
@@ -441,9 +446,14 @@ export function registerRecorderCommands() {
       }
 
       thread!.contextValue = contextValues.join(".");
+      const content = await renderPreviewDescription(reply.text, undefined, {
+        tour,
+        tours: store.activeTour?.tours,
+        workspaceRoot: store.activeTour?.workspaceRoot
+      });
       thread!.comments = [
         new CodeTourComment(
-          reply.text,
+          content,
           label,
           thread!,
           vscode.CommentMode.Preview
diff --git a/src/store/index.ts b/src/store/index.ts
index 0abc8786..657e5b06 100644
--- a/src/store/index.ts
+++ b/src/store/index.ts
@@ -14,19 +14,16 @@ export interface CodeTourStep {
   description: string;
   icon?: string;
 
-  // If any of the following are set, then only
-  // one of them can be, since these properties
-  // indicate the "type" of step.
+  // Une étape guide le lecteur vers un seul type de destination : un fichier,
+  // un répertoire, un contenu virtuel, une ressource ou une vue de VS Code.
   file?: string;
   directory?: string;
   contents?: string;
   uri?: string;
   view?: string;
 
-  // A line number and selection is only relevant for file-based
-  // steps. And even then, they're optional. If a file-based step
-  // doesn't have a line number, then the description is attached
-  // to the last line in the file, assuming it's describing the file itself
+  // La ligne et la sélection précisent la zone à montrer dans un fichier. Sans
+  // position, l'étape est présentée comme une explication du fichier entier.
   line?: number;
   selection?: { start: CodeTourStepPosition; end: CodeTourStepPosition };
 
@@ -52,20 +49,15 @@ export interface ActiveTour {
   tour: CodeTour;
   step: number;
 
-  // When recording, a tour can be active, without
-  // having created an actual comment yet.
+  // Pendant l'enregistrement, la visite peut être active avant que son premier
+  // commentaire ne soit placé dans l'éditeur.
   thread: CommentThread | null | undefined;
 
-  // In order to resolve relative file
-  // paths, we need to know the workspace root
+  // La racine indique dans quel projet ouvrir les chemins relatifs de la visite.
   workspaceRoot?: Uri;
 
-  // In order to resolve inter-tour
-  // links, the active tour might need
-  // the context of its sibling tours, if
-  // they're coming from somewhere other
-  // then the active workspace (e.g. a
-  // GistPad-managed repo).
+  // Les visites associées permettent de suivre un lien vers une autre visite,
+  // y compris lorsque l'ensemble provient d'une source extérieure au projet.
   tours?: CodeTour[];
 }
 
diff --git a/src/store/provider.ts b/src/store/provider.ts
index 72ae4f93..11fc2078 100644
--- a/src/store/provider.ts
+++ b/src/store/provider.ts
@@ -67,14 +67,13 @@ export async function discoverTours(): Promise<void> {
 
       if (tour) {
         if (!comparer.structural(store.activeTour.tour, tour)) {
-          // Since the active tour could be already observed,
-          // we want to update it in place with the new properties.
+          // Recharge la visite sans interrompre la lecture en cours : les
+          // modifications du fichier deviennent visibles à l'étape affichée.
           set(store.activeTour.tour, tour);
         }
       } else {
-        // The user deleted the tour
-        // file that's associated with
-        // the active tour, so end it
+        // Une visite supprimée ne peut plus être poursuivie : le lecteur est
+        // fermé proprement au lieu de conserver un contenu devenu introuvable.
         endCurrentCodeTour();
       }
     }
diff --git a/tsconfig.json b/tsconfig.json
index e451c7ae..ade520ba 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,13 +1,20 @@
 {
   "compilerOptions": {
     "module": "commonjs",
-    "target": "es6",
+    "target": "ES2019",
     "outDir": "out",
     "lib": ["ES2019", "DOM"],
     "sourceMap": true,
     "rootDir": "src",
     "strict": true,
-    "noUnusedLocals": true
+    "noUnusedLocals": true,
+    "baseUrl": ".",
+    "paths": {
+      "codetour-description-renderer": [
+        "packages/description-renderer/dist/src/index"
+      ]
+    }
   },
+  "include": ["src"],
   "exclude": ["node_modules"]
 }
diff --git a/tsconfig.test.json b/tsconfig.test.json
new file mode 100644
index 00000000..6e00861c
--- /dev/null
+++ b/tsconfig.test.json
@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "dist/test",
+    "types": ["node"]
+  },
+  "include": ["src/player/insertCode.ts", "src/player/insertCode.test.ts"]
+}
diff --git a/webpack.config.js b/webpack.config.js
index f66c0105..87ef33c3 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -1,18 +1,35 @@
 const path = require("path");
 const webpack = require("webpack");
 
+const RESVG_EXTERNAL = "commonjs ./resvg-runtime/resvg-js";
+
+// Optional native accelerators of ws/jsdom. They are always required inside
+// try/catch, so the runtime require fails cleanly when they are not installed
+// (VSIX ships no node_modules) and the JS fallbacks take over.
+const OPTIONAL_NATIVE_EXTERNALS = {
+  canvas: "commonjs canvas",
+  bufferutil: "commonjs bufferutil",
+  "utf-8-validate": "commonjs utf-8-validate"
+};
+
 const config = {
   entry: "./src/extension.ts",
   devtool: "source-map",
   externals: {
-    vscode: "commonjs vscode"
+    vscode: "commonjs vscode",
+    child_process: "commonjs child_process",
+    util: "commonjs util",
+    "@resvg/resvg-js": RESVG_EXTERNAL,
+    ...OPTIONAL_NATIVE_EXTERNALS
   },
   resolve: {
-    fallback: {
-      os: require.resolve("os-browserify/browser"),
-      path: require.resolve("path-browserify")
-    },
-    extensions: [".ts", ".js", ".json"]
+    extensions: [".ts", ".js", ".json"],
+    alias: {
+      "codetour-description-renderer": path.resolve(
+        __dirname,
+        "packages/description-renderer/dist/src/index.js"
+      )
+    }
   },
   node: {
     __filename: false,
@@ -49,18 +66,26 @@ const nodeConfig = {
     filename: 'extension-node.js',
     libraryTarget: "commonjs2",
     devtoolModuleFilenameTemplate: "../[resource-path]",
-  }
+  },
+  plugins: [
+    ...config.plugins,
+    new webpack.optimize.LimitChunkCountPlugin({ maxChunks: 1 })
+  ]
 };
 
-const webConfig = {
-  ...config,
-  target: 'webworker',
+const mcpConfig = {
+  mode: "production",
+  target: "node18",
+  entry: "./packages/mcp-server/dist/src/cli.js",
+  externals: {
+    "@resvg/resvg-js": RESVG_EXTERNAL,
+    ...OPTIONAL_NATIVE_EXTERNALS
+  },
+  devtool: "source-map",
   output: {
-    path: path.resolve(__dirname, 'dist'),
-    filename: 'extension-web.js',
-    libraryTarget: "commonjs2",
-    devtoolModuleFilenameTemplate: "../[resource-path]",
+    path: path.resolve(__dirname, "dist"),
+    filename: "mcp-server.js"
   }
 };
 
-module.exports = [nodeConfig, webConfig];
\ No newline at end of file
+module.exports = [nodeConfig, mcpConfig];