From a05e018f1936a61ba080423b10676617e8f5a382 Mon Sep 17 00:00:00 2001 From: Ayla Croft Date: Sun, 6 Sep 2026 22:00:37 -0400 Subject: [PATCH] Serve a request by the revision its _meta declares, not by the carrier ping was refused with -32601 whenever a request carried per-request _meta naming any revision, including 2025-11-25, where ping exists. The clause's own comment named 2026-07-28; the code named no revision. Red first, before any edit to lib/: $ mix test test/beam_mcp/negotiation_test.exs 12 tests, 2 failures exit=2 Nine pre-existing tests passed. Full output in logs/red.txt, written by the command. Measured against the pre-fix tree: ping + _meta 2026-07-28 -> {"error":{"code":-32601,...}} ping + _meta 2025-11-25 -> {"error":{"code":-32601,...}} <- the defect ping + _meta, no version -> {"result":{}} <- the boundary ping bare -> {"result":{}} The same cond modernised every result on the same version-blind basis, so a request declaring 2025-11-25 was answered with resultType and modern _meta serverInfo -- two fields 2026-07-28 introduced and 2025-11-25 does not define. Same root cause, so fixed together; fixing only ping would have left the clause version-blind. The clause now branches on the declared version: 2026-07-28 refuses ping and modernises, 2025-11-25 answers ping and does not, anything else is -32022. Decided against the specification rather than the symptom. Two alternatives were rejected and the argument is in the slice PLAN. Refusing a _meta that names 2025-11-25 would contradict this server's own advertisement -- it returns that revision from server/discover and lists it in the -32022 supported payload, and the spec tells a client receiving -32022 to select from that list and retry, which produces exactly this message. Fixing only the ping guard would have kept an envelope announcing a revision the client did not ask for. The three specification pages quoted are archived under logs/, fetched by curl rather than recalled. Coverage: every test in the file discarded the returned state, so the new era branches were untested for state threading. Three tests added; two are mutation-killed (logs/mutation-a.txt, logs/mutation-b.txt, raw captures), the third guards a write that does not exist and is not scored. $ ./tools/gate.sh format / compile / test / credo pass reuse pass (19 commentable files) licence files pass Gate OK. exit=0 $ mix test 39 tests, 0 failures Version 0.1.2. NOTE FOR RELEASE: this removes resultType and _meta serverInfo from results for every method on the legacy-declared path, not just ping. A 0.1.0 client reading result.resultType there gets nil after what is numbered a patch. The removal is labelled under its own Changed heading in the changelog, and whether 0.2.0 is the honester number is left to the release decision. 0.1.1 reached main and was never published; its documentation fix ships inside 0.1.2. Reviewed over six rounds by two independent lanes on checkouts of the index. Both approved tree d9b0c01e. This commit adds their two round-6 reports and one correction they named: a tally sentence in FINDINGS.md that asserted a count contradicted by the tree's own reports, deleted rather than retyped, inside the paragraph arguing a typed count is indistinguishable from a derived one. Signed-off-by: Ayla Croft --- CHANGELOG.md | 62 +++ README.md | 29 +- lib/beam_mcp/server.ex | 56 ++- mix.exs | 2 +- slices/001b-ping-guard/FINDINGS.md | 396 ++++++++++++++++++ slices/001b-ping-guard/PLAN.md | 207 +++++++++ slices/001b-ping-guard/REVIEW.md | 231 ++++++++++ slices/001b-ping-guard/logs/archive-sweep.txt | 144 +++++++ slices/001b-ping-guard/logs/full-suite.txt | 5 + slices/001b-ping-guard/logs/gate.txt | 8 + .../logs/green-negotiation.txt | 5 + slices/001b-ping-guard/logs/mutation-a.txt | 16 + slices/001b-ping-guard/logs/mutation-b.txt | 28 ++ slices/001b-ping-guard/logs/probe-after.txt | 14 + slices/001b-ping-guard/logs/red.txt | 38 ++ slices/001b-ping-guard/logs/round1.r1.md | 231 ++++++++++ slices/001b-ping-guard/logs/round1.r2.md | 199 +++++++++ slices/001b-ping-guard/logs/round2.r1.md | 273 ++++++++++++ slices/001b-ping-guard/logs/round2.r2.md | 201 +++++++++ slices/001b-ping-guard/logs/round3.r1.md | 304 ++++++++++++++ slices/001b-ping-guard/logs/round3.r2.md | 184 ++++++++ slices/001b-ping-guard/logs/round4.r1.md | 232 ++++++++++ slices/001b-ping-guard/logs/round4.r2.md | 147 +++++++ slices/001b-ping-guard/logs/round5.r1.md | 234 +++++++++++ slices/001b-ping-guard/logs/round5.r2.md | 157 +++++++ slices/001b-ping-guard/logs/round6.r1.md | 245 +++++++++++ slices/001b-ping-guard/logs/round6.r2.md | 157 +++++++ .../logs/spec-basic-versioning.md | 185 ++++++++ slices/001b-ping-guard/logs/spec-changelog.md | 123 ++++++ .../001b-ping-guard/logs/spec-legacy-basic.md | 269 ++++++++++++ test/beam_mcp/negotiation_test.exs | 71 ++++ tools/archive_sweep.sh | 198 +++++++++ tools/probe_ping.exs | 70 ++++ 33 files changed, 4702 insertions(+), 19 deletions(-) create mode 100644 slices/001b-ping-guard/FINDINGS.md create mode 100644 slices/001b-ping-guard/PLAN.md create mode 100644 slices/001b-ping-guard/REVIEW.md create mode 100644 slices/001b-ping-guard/logs/archive-sweep.txt create mode 100644 slices/001b-ping-guard/logs/full-suite.txt create mode 100644 slices/001b-ping-guard/logs/gate.txt create mode 100644 slices/001b-ping-guard/logs/green-negotiation.txt create mode 100644 slices/001b-ping-guard/logs/mutation-a.txt create mode 100644 slices/001b-ping-guard/logs/mutation-b.txt create mode 100644 slices/001b-ping-guard/logs/probe-after.txt create mode 100644 slices/001b-ping-guard/logs/red.txt create mode 100644 slices/001b-ping-guard/logs/round1.r1.md create mode 100644 slices/001b-ping-guard/logs/round1.r2.md create mode 100644 slices/001b-ping-guard/logs/round2.r1.md create mode 100644 slices/001b-ping-guard/logs/round2.r2.md create mode 100644 slices/001b-ping-guard/logs/round3.r1.md create mode 100644 slices/001b-ping-guard/logs/round3.r2.md create mode 100644 slices/001b-ping-guard/logs/round4.r1.md create mode 100644 slices/001b-ping-guard/logs/round4.r2.md create mode 100644 slices/001b-ping-guard/logs/round5.r1.md create mode 100644 slices/001b-ping-guard/logs/round5.r2.md create mode 100644 slices/001b-ping-guard/logs/round6.r1.md create mode 100644 slices/001b-ping-guard/logs/round6.r2.md create mode 100644 slices/001b-ping-guard/logs/spec-basic-versioning.md create mode 100644 slices/001b-ping-guard/logs/spec-changelog.md create mode 100644 slices/001b-ping-guard/logs/spec-legacy-basic.md create mode 100755 tools/archive_sweep.sh create mode 100644 tools/probe_ping.exs diff --git a/CHANGELOG.md b/CHANGELOG.md index 93d6b5b..9c2b966 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -9,6 +9,68 @@ All notable changes to this project are documented here. The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html). +## [0.1.2] — unreleased + +### Changed — two fields are REMOVED from results for legacy-declared requests + +**Read this before upgrading if any client sends `_meta` naming `2025-11-25`.** A result +answering such a request no longer carries `resultType` or `_meta` +`io.modelcontextprotocol/serverInfo`. In `0.1.0` it carried both. This is not limited to +`ping` — it applies to every method reaching that path, `tools/list`, `tools/call` and +`shutdown` included: + + 0.1.0: tools/list + _meta 2025-11-25 + -> {"result":{"_meta":{"io.modelcontextprotocol/serverInfo":{...}},"resultType":"complete","tools":[...]}} + 0.1.2: tools/list + _meta 2025-11-25 + -> {"result":{"tools":[...]}} + +A client that reads `result.resultType` on that path gets `nil` after what is numbered a patch +release. It is numbered a patch because `0.y.z` is outside semver's compatibility contract and +because the removed fields were never correct — they announced a revision the client did not +ask for. **Neither of those makes the wire change smaller**, and the honest signal for a +published package where the JSON *is* the API would arguably be `0.2.0`. Recorded here as the +removal it is so the number is not the only thing a reader has to go on. Raised by review; +the version choice is the owner's at publish time. + +Requests declaring `2026-07-28`, and requests with no `_meta` at all, are unaffected. + +### Fixed + +- **A request declaring `2025-11-25` through per-request `_meta` is now served as + `2025-11-25`.** The `_meta` clause branched on the method and never on the declared + revision, so `ping` was refused with `-32601` at every revision reaching it, and every + result was decorated with `resultType` and `_meta` `serverInfo` — two fields `2026-07-28` + introduced and `2025-11-25` does not define. Both halves came from one version-blind `cond`. + + Measured against `0.1.1`, each message the first and only one on a fresh state. (`0.1.1` + here and `0.1.0` above name the **same** before-state: `0.1.1` changed documentation only, + so the version-blind clause is byte-identical at the `v0.1.0` tag and on `main`. Two numbers + for one behaviour, flagged by review as a readability trap.) + + ping + _meta 2025-11-25 -> {"error":{"code":-32601,"message":"Method not found: ping"},...} + tools/list + _meta 2025-11-25 + -> {"result":{"_meta":{"io.modelcontextprotocol/serverInfo":{...}},"resultType":"complete",...}} + + and after: + + ping + _meta 2025-11-25 -> {"id":1,"jsonrpc":"2.0","result":{}} + tools/list + _meta 2025-11-25 -> {"result":{"tools":[...]}} # no resultType, no _meta + + Live in published `0.1.0`. The refusal is reachable only through `_meta`: a bare `ping`, and + a `_meta` carrying no `io.modelcontextprotocol/protocolVersion`, were always answered. + + Why a `_meta` may name the legacy revision at all: this server advertises `2025-11-25` in + `server/discover` and lists it in the `-32022` `supported` payload, and the specification + tells a client receiving `-32022` to select from `supported` and **retry the request** — + which produces exactly this message. `_meta` fixes statelessness; the revision it names + fixes the semantics. + +### Note on `0.1.1` + +`0.1.1` reached `main` and was **never published to Hex**. `mix.exs` now reads `0.1.2`, so +`0.1.1` will not exist as a release and the moduledoc fix recorded below ships inside `0.1.2`. +The `0.1.1` section is left exactly as written; this note is appended rather than a rewrite. + ## [0.1.1] — unreleased ### Fixed diff --git a/README.md b/README.md index 1ca0734..acac957 100644 --- a/README.md +++ b/README.md @@ -89,14 +89,37 @@ one legacy revision. | | `2026-07-28` (modern) | `2025-11-25` (legacy) | |---|---|---| -| opens with | any request, or `server/discover` | `initialize` | -| version travels in | `_meta` on every request | the `initialize` params | -| session | none; each request stands alone | yes | +| opens with | any request, or `server/discover` | `initialize`, or `_meta` naming it | +| version travels in | `_meta` on every request | the `initialize` params, or `_meta` | +| session | none; each request stands alone | tracked, not enforced — see below | | `ping` | removed from the revision, refused | answered | +| result envelope | `resultType` and `_meta` `serverInfo` | neither; both are `2026-07-28` additions | `server/discover`, `tools/list`, `tools/call`, `shutdown`, `exit` at both eras; `initialize` and `notifications/initialized` at legacy only. +**A revision, not a carrier, decides the semantics.** `_meta` decides only that a request is +served statelessly. Which revision the `_meta` *names* then decides the method table and the +result envelope, so a `ping` declaring `2025-11-25` through `_meta` is answered and its result +carries no `resultType`. This matters because `-32022` tells a client to pick from `supported` +— which lists `2025-11-25` — and retry the request, so a `_meta` naming the legacy revision is +a message this server asks clients to send. + +**Two exceptions, and they are exceptions to the row above.** `server/discover` and +`initialize` are matched *before* the revision switch, so neither is affected by what a `_meta` +declares and **neither result is decorated** — a `server/discover` result carries no +`resultType` even under `2026-07-28`, where the specification requires one on every result. +`server/discover` is matched first on purpose: on stdio it is the era probe, sent by a client +that does not yet know what it is talking to. The missing `resultType` on it is a known gap, +not a design choice. + +**The session is tracked, not enforced.** Nothing in this package refuses a request because +`initialize` has not been seen: every method it implements is served bare, `tools/call` +included — and `tools/call` executes through the host's dispatch. On stdio that is defensible, +because whoever can write to the transport already has the host's privileges. **On any +transport where that is not true, refusing unestablished callers is the host's job, and this +package does not do it for you.** + A request naming a revision the server does not support gets `UnsupportedProtocolVersionError` (**`-32022`**) listing what it does support. **`2024-11-05` is not supported** — it predates the two chosen revisions. diff --git a/lib/beam_mcp/server.ex b/lib/beam_mcp/server.ex index 4aa7b4b..d677c76 100644 --- a/lib/beam_mcp/server.ex +++ b/lib/beam_mcp/server.ex @@ -14,10 +14,17 @@ defmodule BeamMCP.Server do ## Two eras It serves `2026-07-28` and `2025-11-25`, and tells them apart the way the specification says - a dual-era server should: a request carrying per-request `_meta` is served statelessly under - the modern revision, and an `initialize` request selects legacy semantics. A request naming - a revision it does not support gets `UnsupportedProtocolVersionError` (`-32022`) listing - what it does. + a dual-era server should: a request carrying per-request `_meta` is served statelessly, and + an `initialize` request selects legacy semantics. `_meta` decides only the statelessness — + the revision it *names* then decides the method table and the result envelope, so a request + declaring `2025-11-25` through `_meta` gets that revision's semantics, not the modern ones. + A request naming a revision it does not support gets `UnsupportedProtocolVersionError` + (`-32022`) listing what it does. + + Two methods are matched before that switch and so are served identically at both eras: + `server/discover`, which is the stdio era probe and must answer a client that does not yet + know what it is talking to, and `initialize`, which selects legacy semantics whatever else + it carries. Neither result is decorated. ## What the host supplies @@ -116,22 +123,41 @@ defmodule BeamMCP.Server do end end - # A request carrying modern per-request _meta is served statelessly under 2026-07-28. + # A request carrying a _meta that NAMES A REVISION is served statelessly: no session, + # whatever revision it names. A _meta that is not a map, or that carries no version key, + # does not match this head at all and falls through to the handlers below. + # Which revision it names then decides the method table and the result envelope, + # because the spec requires every request to declare its version in _meta and requires the + # server to serve or refuse *that* version. Both branches below are reachable: -32022 tells + # a client to pick from `supported` -- which lists 2025-11-25 -- and retry the request, + # so a _meta naming the legacy revision is a message this server asks clients to send. def handle_message( state, %{"jsonrpc" => "2.0", "id" => id, "_meta" => %{@version_meta_key => version}} = message ) do - cond do - version not in @supported_versions -> + bare = Map.drop(message, ["_meta"]) + + case version do + @modern_version -> + # ping was removed in 2026-07-28. The legacy handler below must not be inherited by a + # request that declared the modern revision. + if message["method"] == "ping" do + {state, error(id, -32_601, "Method not found: ping")} + else + {next, response} = handle_message(state, bare) + # `next`, not `state`: modernise/2 reads only server_name today, which nothing + # mutates, so this is currently indistinguishable -- and would stop being so the + # moment any handler changed a field modernise/2 reads. + {next, modernise(response, next)} + end + + @legacy_version -> + # 2025-11-25 semantics: ping exists, and the result carries neither resultType nor + # serverInfo _meta, both of which 2026-07-28 introduced. + handle_message(state, bare) + + _other -> {state, unsupported_version(id, version)} - - # ping was removed in 2026-07-28. The legacy handler must not inherit it. - message["method"] == "ping" -> - {state, error(id, -32_601, "Method not found: ping")} - - true -> - {next, response} = handle_message(state, Map.drop(message, ["_meta"])) - {next, modernise(response, state)} end end diff --git a/mix.exs b/mix.exs index 2f98e99..7172047 100644 --- a/mix.exs +++ b/mix.exs @@ -4,7 +4,7 @@ defmodule BeamMCP.MixProject do use Mix.Project - @version "0.1.1" + @version "0.1.2" @source_url "https://github.com/ScriptKittyOS/beam_mcp" def project do diff --git a/slices/001b-ping-guard/FINDINGS.md b/slices/001b-ping-guard/FINDINGS.md new file mode 100644 index 0000000..da5cd8a --- /dev/null +++ b/slices/001b-ping-guard/FINDINGS.md @@ -0,0 +1,396 @@ + + +# Slice 001b — FINDINGS + +Every count below is quoted from the output of the named command. Every log file under +`logs/` was written by the command that produced it (`… | tee logs/.txt`), so it is an +archive in the sense `CONVENTIONS.md` requires — the bytes are the command's bytes, not a +transcription. + +Worktree: `/home/aylac/Projects/beam_mcp-wt/001b-ping-guard`, branch `slice/001b-ping-guard`, +off `main` at `5d8d1ae`, with its own `_build` and `deps`. The canonical clone was not written +to. + +## Finding 1 — `ping` refused under `2025-11-25`. SCR-257. Live in published `0.1.0`. + +`lib/beam_mcp/server.ex:120-135` at `5d8d1ae`. The `_meta` clause's `cond` branched on +`message["method"] == "ping"` with no comparison against `@modern_version`, while the comment +above it named `2026-07-28`. + +**Observed** — `mix run /probe_ping.exs`, `mix.exs` version `0.1.1`: + + ping + _meta 2026-07-28 + -> {"error":{"code":-32601,"message":"Method not found: ping"},"id":1,"jsonrpc":"2.0"} + ping + _meta 2025-11-25 + -> {"error":{"code":-32601,"message":"Method not found: ping"},"id":1,"jsonrpc":"2.0"} + ping + _meta, no version key + -> {"id":1,"jsonrpc":"2.0","result":{}} + ping bare + -> {"id":1,"jsonrpc":"2.0","result":{}} + +**Expected**: line 2 returns `{"result":{}}`. `ping` exists in `2025-11-25`; this server +advertises `2025-11-25` in `server/discover` and lists it in the `-32022` `supported` payload. + +**Boundary, measured rather than assumed**: line 3. A `_meta` carrying no +`io.modelcontextprotocol/protocolVersion` does not match the clause head and falls through to +the bare handler. The defect is specific to a `_meta` that names a revision. + +## Finding 2 — the same clause modernised every result, on the same version-blind basis + +Not in SCR-257; found while measuring finding 1. + +**Observed**, same command and run: + + tools/list + _meta 2025-11-25 + -> {"id":2,"jsonrpc":"2.0","result":{"_meta":{"io.modelcontextprotocol/serverInfo": + {"name":"beam_mcp","version":"0.1.1"}},"resultType":"complete","tools":[...]}} + +**Expected**: no `resultType`, no `_meta`. Both are `2026-07-28` additions. + +**Corrected in round 2, r1 finding 1c.** Round 1 argued this from the changelog's item 8 — +clients "**MUST** treat results from earlier-protocol servers that omit the field as +`complete`" — and said that MUST "is only coherent if an earlier-revision result omits it". +That is an inference, and it was set next to two genuinely quoted MUSTs where it read as a +third. It is not one: item 8's MUST is addressed to **clients** and governs how they handle +*omission*, not whether a server may *emit*. r1 also checked `2025-11-25`'s own base-protocol +page, which says a result "**MAY** follow any JSON object structure" — so keeping the two +fields would have violated no normative requirement in either revision. + +The corrected basis: emitting `resultType` and a modern `serverInfo` on a result answering a +request that declared `2025-11-25` announces a revision the client did not ask for. The fix +wins on **honesty**, not on conformance. The distinction matters because a conformance claim +is checkable against the spec and this one would have failed. + +Same root cause as finding 1 — one `cond` that never reads `version` — so fixed in the same +change rather than filed onward. Fixing only `ping` would have left the clause version-blind. + +## The red, before any edit to `lib/` + + $ mix test test/beam_mcp/negotiation_test.exs + 12 tests, 2 failures + exit=2 + +Full output: `logs/red.txt`, written by the command. + +**Corrected in round 2, r1 finding 6.1.** The first version of this sentence read "the ten +pre-existing tests passed, so the red is the two additions". Both numbers were typed fresh and +both are wrong, which is the exact thing `CONVENTIONS.md` forbids. Derived rather than typed: + + $ git show base/main:test/beam_mcp/negotiation_test.exs | grep -c '^\s*test ' + 9 + $ grep -c '^\s*test ' test/beam_mcp/negotiation_test.exs # at the round-1 index + 12 + +**Nine** pre-existing tests, **three** additions. Two of the three are red at `base/main`; the +third (`a 2026-07-28 result carries resultType and serverInfo _meta`) passes there and is a +regression guard, not a red. The old sentence's arithmetic was self-consistent and landed on +the right total, which is why it survived being written. + +Round 2 added three more tests — two of them mutation-killed, the third an unscored guard, +as corrected below — for a file total of 15. + +## Green + + $ mix test test/beam_mcp/negotiation_test.exs + 12 tests, 0 failures + exit=0 + + $ mix test + 36 tests, 0 failures + +**Those two counts are the ROUND-1 measurement and the archives no longer hold them.** Round 2 +added three tests and re-took both logs, so `logs/green-negotiation.txt` now reads +`15 tests, 0 failures` and `logs/full-suite.txt` `39 tests, 0 failures`. The round-1 numbers are +kept here because this section is the round-1 record; the citations to the log files are removed +from them, because a citation pointing at bytes that say something else is worse than no +citation. r2 finding 2 — and it is the same defect as r1's 6.1, in the same file, one round +later: re-taking the evidence and leaving the quotation behind. + + $ mix run /probe_ping.exs # logs/probe-after.txt + ping + _meta 2026-07-28 -> {"error":{"code":-32601,...}} unchanged + ping + _meta 2025-11-25 -> {"id":1,"jsonrpc":"2.0","result":{}} + ping + _meta, no version key -> {"id":1,"jsonrpc":"2.0","result":{}} unchanged + ping bare -> {"id":1,"jsonrpc":"2.0","result":{}} unchanged + tools/list + _meta 2025-11-25 -> {"result":{"tools":[...]}} no resultType, no _meta + tools/list + _meta 2026-07-28 -> {"result":{"_meta":{...},"resultType":"complete",...}} unchanged + +The pre-existing test "a modern ping is refused" was **not** edited and still passes, so +acceptance criterion 2 is met by an unmodified assertion. It is at `negotiation_test.exs:145` +at `base/main` and moves down as lines are inserted above it; cited by name rather than by line +because r2 (finding 7) followed the number into the merged tree and landed on a different test. +`git diff base/main HEAD -- test/` shows no `-` line anywhere in that describe block. + +## Gate + + $ ./tools/gate.sh # logs/gate.txt + == beam_mcp gate == + format pass + compile pass + test pass + credo pass + reuse pass (17 commentable files) + licence files pass + Gate OK. + gate exit=0 + +Read per step, not by exit code alone: all six lines read `pass`. + +## Scripted edits, match counts asserted + +**Six** edits in round 1, each applied by a Python replace that asserted its count before and +after and would have raised rather than no-opped. (Round 1 said "four" over a six-row table — +r1 finding 6.1. Corrected, not rewritten: the table below was always the authority.) + +| edit | file | before | after | +|---|---|---|---| +| `legacy_meta/2` helper | `test/beam_mcp/negotiation_test.exs` | 1 | 1 present | +| three new tests | `test/beam_mcp/negotiation_test.exs` | 1 | old 0, new 1 each | +| the `_meta` clause | `lib/beam_mcp/server.ex` | 1 | old 0, new 1 | +| era table | `README.md` | 1 | old 0, new 1 | +| `@version` | `mix.exs` | 1 | old 0, new 1 | +| `0.1.2` section | `CHANGELOG.md` | 1 | 0.1.2 = 1, 0.1.1 = 1 (kept) | + +## Recorded, not fixed — out of scope, filed onward + +1. **`ttlMs` and `cacheScope` are missing from `tools/list` results.** `2026-07-28` requires + both on `tools/list`, `prompts/list`, `resources/list`, `resources/read` and + `resources/templates/list` via `CacheableResult` (changelog, minor change 5). + `modernise/2` at `lib/beam_mcp/server.ex` adds `resultType` and `_meta` `serverInfo` and + neither of these. Pre-existing since slice 001 and unrelated to the version branch. + Observed in `logs/probe-after.txt`: the `2026-07-28` `tools/list` result carries neither. +2. **A `_meta` with no version key is served bare.** Line 3 of finding 1's measurement. That + is the no-era-established path and belongs to SCR-255, not here. + +--- + +# Round 2 — what the two reviewer lanes changed + +Both lanes read tree `a42f1b1e82599b203df0afcaaa8639203fd663d7`, which equalled `git write-tree` +on the staged index. Both returned **changes required**. **Neither raised a finding against +`lib/`'s logic**: r2 states "The `lib/` change is correct, minimal, and I found nothing to fix +in it", and r1 that "the fix itself is correct, minimal, well-argued against the fetched spec". +Every change below is documentation, evidence, or coverage. + +## Blocking — one, from r1 (finding 2.1) + +`lib/beam_mcp/server.ex:16-18`, the `@moduledoc`, said a `_meta` request "is served statelessly +under **the modern revision**" — the exact rule this slice deletes. The inline comment and the +README were updated in round 1; the moduledoc, which is the hexdocs front page for the +package's principal module, was missed. That is the same doc/code mismatch as the defect the +slice exists to close, one file up. Fixed, and the moduledoc now also names the two methods +matched before the era switch. + +## Coverage — r1 finding 4, and it was a real gap + +`send_msg/1` discards the returned state, so **every** test in the file threw the state away and +nothing could catch a branch returning the wrong one. `shutdown` is the only request method that +changes state and it reaches both branches. Three tests added. **Two of the three are +mutation-killed; the third is not, and cannot be** — nothing on the `ping` path writes state, so +falsifying it would mean inventing a write rather than perturbing an existing one. It is a guard +against a write that does not exist, and it is not scored. Round 2 first claimed all three were +"scored by mutation" over a single mutant; both lanes caught it (r1 finding 1, r2 finding 4) and +both independently ran the second mutation. Corrected, and both mutations are archived **raw** at +`logs/mutation-a.txt` and `logs/mutation-b.txt` — `mix test … > file 2>&1`, no pipe and no +filter, each carrying the seed line, the progress dots, the whole failure block including +`code:` and `stacktrace:`, and the `Finished in …` line. + +Round 3 first wrote a single `logs/mutation.txt` produced by a `{ … } | tee` whose `mix test` +was piped through `grep -E`, and labelled it "written by the commands that ran them". It was a +curated extract: it dropped the seed line and **all five** indented lines of the failure block +(the `1) test …` header survived; the five lines under it did not) — +including the assertion message that identifies *which* assertion failed. r2 caught it (round 3, +blocking) and declined to soften a finding it had made blocking one round earlier on a different +file. That file is deleted and replaced by the two raw captures. **Third instance in this slice +of the same rule.** + +The scoring below is a hand-written summary and is labelled as one — it is not captured output +and does not claim to be: + + mutation: the @legacy_version branch returns {state, response} instead of the recursion's tuple + match count before = 1, old remaining after = 0 # asserted applied + $ mix compile --force # applied before scoring, not after + $ mix test test/beam_mcp/negotiation_test.exs + 1) test ... shutdown declaring 2025-11-25 through _meta still sets shutdown? + 15 tests, 1 failure + REAL_EXIT=2 + +The mutant is killed. A test that passes over an unapplied mutant would have been discarded, not +scored — the rule from SCR-259. + +## A second `lib/` change in round 2, which no lane asked for — disclosed late + +`lib/beam_mcp/server.ex`: `{next, modernise(response, state)}` became +`{next, modernise(response, next)}`, on r1's round-1 **note** 2.3. Round 2's opening sentence +said this section held one `lib/` change, the moduledoc, and that "every change below is +documentation, evidence, or coverage". That was false of the tree it shipped, and r2 (finding 3) +caught it by mutation rather than by reading the record: + + MUTANT: modernise reads the pre-recursion state (this change, reverted) + applied: before=1 old_after=0 new_after=1 + 15 tests, 0 failures + REAL_EXIT=0 # the mutant SURVIVES + +**The change is unfalsifiable today and is kept anyway.** `modernise/2` reads only +`server_name`, which no handler mutates, so `state` and `next` are indistinguishable here — the +code comment says exactly that. It is defensive correctness against a latent trap, not a fix. It +is recorded because an undisclosed edit is a defect in the record whether or not it is a defect +in the code, and because a surviving mutant that is *correctly* a survivor still has to be +reported as one. + +## Evidence — r2 finding 1 / r1 finding 6.3 + +`logs/probe-after.txt` was captured after the `lib/` edit and **before** the `mix.exs` bump, so +it reported `beam_mcp version: 0.1.1` and archived a `serverInfo` carrying `0.1.1` — a version +string that exists nowhere in the committed bytes, in the one file recording what the modern +envelope emits. The bytes were genuinely the command's; the tree they measured was not the tree +being shipped. **Re-taken against the final tree**, and `logs/full-suite.txt` and +`logs/green-negotiation.txt` re-taken with it. + +## Prose that claimed more than the code keeps — r1 2.2, r2 2 and 4 + +Round 1's new README paragraph said the declared revision "decides the method table and the +result envelope". Both lanes found reachable counterexamples, because `server/discover` and +`initialize` are matched **before** the `_meta` clause: + + modern _meta + server/discover + -> {"result":{"capabilities":{...},"protocolVersions":[...],"serverInfo":{...}}} # no resultType + +`server/discover` is **mandatory** in `2026-07-28` and its result carries no `resultType`, which +the same revision requires on every result. Round 1 replaced a paragraph that stated the intended +rule rather than the shipped one with a paragraph that had the same property — which is the +defect this slice is about, committed a second time in the fix for it. The README now carries +both exceptions explicitly, and the `server/discover` gap is recorded below. + +## Recorded in round 2, not fixed — all out of scope, all filed or listed + +3. **`server/discover` results carry no `resultType`.** Mandatory method, required field, + pre-existing since slice 001. Same family as the `ttlMs`/`cacheScope` gap and belongs with it. +4. **The session is tracked and never enforced.** `grep -rn 'initialized?' lib/` returns four + hits: one type, one initialiser, two writes, **no read**. A bare `tools/call` dispatches. That + is SCR-255, and it is now stated in the README rather than left as tribal knowledge — r2's + point that a requirement nobody is told about is not a control. +5. **`-32022` echoes arbitrary caller-supplied JSON** back in `data.requested` + (`server.ex`, `unsupported_version/2`). Maps, lists and booleans are echoed verbatim. + Reflection is to the same caller and amplification is ~1x, so not a defect — recorded because + the new `_other` branch is where it now lives and a future change that logs or forwards that + payload would inherit it. Byte-identical at `base/main`. +6. **The gate's REUSE population is a hand-written glob** (`git ls-files -- '*.ex' '*.exs' '*.sh' + '*.yml'`) under a comment reading "every tracked file that can carry a comment". `.md` is + outside it, and two tracked root `.md` files carry no SPDX header. `.txt` being outside is + **correct** — an SPDX header prepended to a `tee`d archive would stop the bytes being the + command's bytes. + + **The headerless population is derived, not counted by hand** (r2 round 3, finding 2 — which + found the hand-written number four files short and observed it would be six short once the + round-3 reports landed): + + $ git ls-files -- '*.md' | while read -r f; do \ + head -5 "$f" | grep -q 'SPDX-License-Identifier' || echo " $f"; done + + **The `curl -o` rationale does not cover all of them, and that is the point.** It covers the + three `logs/spec-*.md` files exactly — fetched bytes, which a header would corrupt. It does + **not** cover the reviewer-lane reports under `logs/`, which are authored prose: ordinary + `.md` files that this tree's convention would header and that the gate cannot see either way. + So the gap has two kinds of file in it and only one kind has a defence. Filed rather than + fixed. +7. **`tools/gate.sh`'s `licence files` line is not printed at all when an earlier step failed** + (`[ "$fail" -eq 0 ] && note …`), so a reader following "read the step's line, not the exit + code" gets an absent verdict rather than a failing one. Filed rather than fixed. + +## Semver — raised by r2, and left open for the owner + +r2 accepted `0.1.2` but insisted the removal be labelled, which it now is under its own +`### Changed` head. Its argument for `0.2.0` is recorded there rather than resolved here: for a +published package the wire JSON is the API, and two fields disappear from a path that produced +them in `0.1.0`. Publishing is the owner's step, so the number is still theirs to change. + +## Round 2 counts, quoted + + $ mix test test/beam_mcp/negotiation_test.exs 15 tests, 0 failures + $ mix test 39 tests, 0 failures + +--- + +# Rounds 3 and 4 — the same rule, three times, in the file that claims it + +This section exists because r2 (round 3, finding 3) pointed out that the evidence log recorded +none of it: `FINDINGS.md` opens by asserting every file under `logs/` is an archive written by +its command, and the one round where that was untrue was missing from the file making the claim. + +## The recurrence, stated plainly + +| # | round | file | what was wrong | caught by | +|---|---|---|---|---| +| 1 | 1 | `probe-after.txt` | genuine bytes, but of a tree that was not being shipped (`0.1.1`) | r2 finding 1, r1 6.3 | +| 2 | 2 | `full-suite.txt`, `green-negotiation.txt` | re-taken through `\| tail -4`; `mix test`'s seed line stripped | r2, **blocking** | +| 3 | 3 | `mutation.txt` | `{ … } \| tee` with `mix test` piped through `grep -E`; seed line, progress dots, `Finished in`, and **all five** indented failure-block lines dropped | r2, **blocking** | + +Each fix introduced the next defect. Round 2's re-take was the fix for #1 and produced #2. +Round 3's `mutation.txt` was added to close the family and was #3. + +**`FINDINGS.md:234-235` is corrected by this section rather than rewritten.** It reads that the +two logs were "re-taken against the final tree", which is true and is the record of the re-take +that turned out to be filtered. They were re-taken **twice**: once in round 2, filtered, and +again in round 3 with `> file 2>&1`. The first re-take is the sharpest finding in the slice. + +**A fourth hand-written count, found inside the table that catalogues hand-written counts.** +r1 (round 4, finding 2) measured the deleted `mutation.txt` against the raw capture now in the +tree: the `1) test …` header survived and **all five** indented lines were dropped, not four of +five. The wrong figure appeared twice, once in the instance-table row for this exact family. +Corrected above. r1's round-3 figure of thirteen lines per block is the same measurement taken +from the other end and was right. + +**The tally that stood here is deleted rather than corrected**, and that is the point of it. +It read "four fresh counts across five rounds" while `logs/round5.r1.md` heads its own finding +"The fifth count" and the slice ran six rounds — a typed number, wrong in both figures, +**inside the paragraph arguing that a typed count is indistinguishable from a derived one.** +r1 found it (round 6). Replacing it with a freshly typed "five across six" would repeat the +defect in the act of fixing it, and no command in this tree derives the number, so the honest +move is to state the fact without the count: every one of these was caught by a lane, and none +by me. The instances themselves are enumerated in the table above, where they can be counted by +a reader rather than asserted by the author. + +**And the fourth did not originate with me — it came from a reviewer report, and I adopted it +without re-deriving.** r2 raised this against itself in round 5 (finding 4): the "four of five" +figure was written in r2's own round-3 report, in the sentence explaining why its blocking +finding was blocking. I folded that number into `FINDINGS.md` and into the instance table on +the strength of its source, and r1 caught it a round later. + +The lesson is therefore not "be careful with numbers", and not even "derive your own counts". It +is that **a count is underived no matter whose page it is on.** A figure in an adversarial +reviewer's report is exactly as unverified as one in mine; taking it on trust because of who +wrote it is how this one survived two rounds and reached the table that catalogues this family. +`CONVENTIONS.md` requires the command rather than the number, and that requirement does not +weaken when the number arrives from someone checking your work. + +## Why counting is not checking, which is the transferable part + +r1 re-ran both commands in round 2 and compared **counts**. The counts were right, so it passed. +r2 compared **bytes** — `diff` against a fresh run, `1d0` — and ruled out a configuration +explanation (`--seed 0`, `test_helper.exs`) before calling it. Same evidence, same two lanes, one +method finds it and the other cannot. For anything labelled an archive, diff the bytes. + +r2 also declined to soften #3 to a note, and said why: an identical defect on a different file +cannot be blocking one round and a note the next, "or the standard is whatever the reviewer feels +like that morning". Recorded because that is the reason the third instance was caught at all. + +## Round 4 — what changed + +1. `logs/mutation.txt` **deleted**; replaced by `logs/mutation-a.txt` and `logs/mutation-b.txt`, + each `mix test … > file 2>&1`, no pipe, no filter. Both mutations re-run from a fresh copy of + the tree, match counts asserted before and after, `mix compile --force` before scoring per + SCR-259. Mutation A kills the legacy `shutdown` test; B kills the modern one; each run reports + `15 tests, 1 failure`, real exit 2. +2. The label "written by the commands that ran them" removed from `FINDINGS.md` and `REVIEW.md`; + the scoring table is now marked a hand-written summary, which it always was. +3. The `.md` SPDX-gap item now derives its population by command instead of carrying a + hand-written three, and distinguishes fetched bytes (a header would corrupt them) from the + authored lane reports (no such defence). +4. `REVIEW.md`'s tree-hash list extended to round 3 — if the list is the binding, it carries + every round it binds. + +**No change to `lib/` or `test/` in rounds 3 or 4.** Both lanes' `lib/` conclusions stand on +bytes they read at `867f28ce`. diff --git a/slices/001b-ping-guard/PLAN.md b/slices/001b-ping-guard/PLAN.md new file mode 100644 index 0000000..77db94b --- /dev/null +++ b/slices/001b-ping-guard/PLAN.md @@ -0,0 +1,207 @@ + + +# Slice 001b — the `_meta` era guard: `ping`, and the result shape that goes with it + +**Written before any edit to `lib/`.** Sub-slice of 001, per the letter-suffix convention: a +defect found in slice 001's revision-negotiation work after it merged and after `0.1.0` +published. Issue: SCR-257. + +**Every specification claim below was fetched on 2026-09-06 from +`https://modelcontextprotocol.io/specification/2026-07-28/basic/versioning` and +`.../changelog`, not recalled.** The `2026-07-28` revision post-dates this agent's training +data, so nothing here is asserted from memory. + +**Every page quoted anywhere in this slice is archived, by a command that fetched it** — +`curl -sSL --fail … -o `, so the bytes are the source's bytes: + + logs/spec-basic-versioning.md 2026-07-28 versioning and compatibility + logs/spec-changelog.md 2026-07-28 key changes + logs/spec-legacy-basic.md 2025-11-25 base protocol + +Added in round 2: r2 was right that "fetched, not recalled" is an unverifiable process assertion +when the quotes it licenses are the load-bearing evidence for the whole decision, and that citing +the URL was permitted but weaker than archiving at no extra cost. The third page was added in +round 3, on r2's finding 5: round 2's correction about `resultType` leaned on `2025-11-25`'s base +page, and the sentence above claimed *both* pages were archived while a third had quietly become +load-bearing. + +## Where the probe runs + +`/home/aylac/Projects/beam_mcp-wt/001b-ping-guard` — a `git worktree` off `main` at `5d8d1ae`, +with its own `_build` and `deps`. The canonical clone at `/home/aylac/Projects/beam_mcp` is +not written to by any probe in this slice. The probe script itself lives outside the tree, in +the session scratchpad, so it is never a tracked file and never enters the gate's REUSE +population by accident. + +## The defect, measured + +`mix run` against the worktree at `5d8d1ae`, `mix.exs` version `0.1.1`, each message the first +and only one handed to a fresh `Server.new/1` state: + + ping + _meta 2026-07-28 + -> {"error":{"code":-32601,"message":"Method not found: ping"},"id":1,"jsonrpc":"2.0"} + ping + _meta 2025-11-25 + -> {"error":{"code":-32601,"message":"Method not found: ping"},"id":1,"jsonrpc":"2.0"} + ping + _meta, no version key + -> {"id":1,"jsonrpc":"2.0","result":{}} + ping bare + -> {"id":1,"jsonrpc":"2.0","result":{}} + +Line 2 is the defect. Line 3 is the **measured boundary**: a `_meta` that carries no +`io.modelcontextprotocol/protocolVersion` does not match the clause head at all and falls +through to the bare handler, so the defect is specific to a `_meta` that names a revision. + +`lib/beam_mcp/server.ex:120-135`: + +```elixir +def handle_message( + state, + %{"jsonrpc" => "2.0", "id" => id, "_meta" => %{@version_meta_key => version}} = message + ) do + cond do + version not in @supported_versions -> + {state, unsupported_version(id, version)} + + # ping was removed in 2026-07-28. The legacy handler must not inherit it. + message["method"] == "ping" -> + {state, error(id, -32_601, "Method not found: ping")} + + true -> + {next, response} = handle_message(state, Map.drop(message, ["_meta"])) + {next, modernise(response, state)} + end +end +``` + +The guard tests the method and nothing else. The comment names `2026-07-28`; the code names no +revision. Every supported revision reaching this clause takes the refusal branch. + +## The second half of the same defect, found while measuring, not in SCR-257 + +The same clause modernises **every** result it produces, on the same version-blind basis: + + tools/list + _meta 2025-11-25 + -> {"id":2,"jsonrpc":"2.0","result":{"_meta":{"io.modelcontextprotocol/serverInfo": + {"name":"beam_mcp","version":"0.1.1"}},"resultType":"complete","tools":[...]}} + +A request that declared `2025-11-25` is answered with a result carrying `resultType` and +modern `_meta` `serverInfo` — two fields `2026-07-28` introduced and `2025-11-25` does not +define. This is the mirror image of the defect slice 001 was written to close, which was a +modern request answered in a legacy shape. It is the same root cause as the `ping` guard — +one `cond` that branches on the method but never on `version` — so it is in scope here rather +than filed onward. Fixing only `ping` would leave the clause still version-blind. + +## What the specification says + +From **Versioning and Compatibility**, `2026-07-28`: + +> Every request declares the protocol version it is using in its `_meta` field. + +> If the server does not implement the requested version (whether the version is unknown to +> the server, or is a known version the server has chosen not to support), it **MUST** respond +> with an `UnsupportedProtocolVersionError` listing the versions it does support + +with the page's own example carrying `"supported": ["2026-07-28", "2025-11-25"]`, and: + +> The client **SHOULD** select a mutually supported version from the `supported` list and +> retry the request + +> A dual-era **server** selects its behavior from how the client opens: +> * A request carrying modern per-request `_meta` is served statelessly according to this +> revision. +> * An `initialize` request selects legacy semantics [...] + +From the **changelog**, `2026-07-28`: + +> 5. Remove `ping`, `logging/setLevel`, and `notifications/roots/list_changed`. + +> 8. All results now carry a required `resultType` field [...] Clients **MUST** treat results +> from earlier-protocol servers that omit the field as `"complete"`. + +## The decision, and why the other two shapes lose + +Three shapes are defensible. They are not equally honest. + +**(A) — chosen. The `_meta` clause branches on the declared version.** `2026-07-28` refuses +`ping` and modernises; `2025-11-25` answers `ping` and does **not** modernise; anything else is +`-32022`. + +**(B) — rejected. Refuse any `_meta` naming a legacy revision with `-32022`.** The spec permits +a server to not support a known version, so this is coherent *only for a server that does not +advertise it*. This server does advertise it: `server/discover` returns +`["2026-07-28","2025-11-25"]`, `initialize` answers `2025-11-25`, and the `-32022` payload +itself lists `2025-11-25` as supported. The spec's prescribed client behaviour on `-32022` is +to pick from `supported` and **retry the request** — i.e. resend the same `_meta`-shaped +request naming `2025-11-25`. (B) turns that into an infinite loop against our own advertisement. +Making (B) honest would mean dropping `2025-11-25` from the supported set, which is a different +and much larger change and contradicts the `initialize` path this package already serves. + +**(C) — rejected. Add `and version == @modern_version` to the `ping` guard, change nothing +else.** This is what SCR-257's title implies and it closes the reported symptom. It leaves the +clause answering a request that declared `2025-11-25` with `resultType` and modern `serverInfo` +— it fixes the method table and keeps the wrong envelope. The brief instructs deciding the +shape against the specification rather than against the issue text, and the specification is +explicit that `resultType` is a `2026-07-28` addition which earlier-revision servers omit. + +(A) is the only shape under which the clause's own comment becomes true. + +## Note on "served according to this revision" + +The spec sentence *"a request carrying modern per-request `_meta` is served statelessly +according to this revision"* describes the era discriminator: `_meta` means stateless, not +session. It is read here as fixing the **statelessness**, not as fixing the revision to +`2026-07-28` regardless of what the `_meta` declares — because the same page's negotiation +section says every request declares its version in `_meta` and requires the server to serve or +refuse **that** version, and because the retry loop above only terminates under that reading. +Recorded explicitly because it is the one sentence that could be read to support (B). + +## In scope + +1. `lib/beam_mcp/server.ex` — the `_meta` clause branches on `version`. +2. `test/beam_mcp/negotiation_test.exs` — the red, added and demonstrated failing first. +3. `README.md` — the era table, which currently states the intended rule and not the shipped one. +4. `CHANGELOG.md` — a `0.1.2` section. +5. `mix.exs` — version `0.1.1` -> `0.1.2`. +6. This slice directory. + +## Out of scope, recorded rather than fixed + +- **`ttlMs` and `cacheScope` on `tools/list` results.** `2026-07-28` requires both + (changelog, minor change 5) and `modernise/2` adds neither. Pre-existing since slice 001, + unrelated to the version branch, filed rather than fixed. +- **A `_meta` with no version key is served bare** (line 3 of the measurement). That is the + no-era-established path, which is SCR-255, not this slice. +- Anything about HTTP. That is SCR-253 / slice 002. + +## Acceptance criteria + +1. A `ping` carrying `_meta` `2025-11-25` returns `result` `%{}` — red before the fix, green + after, output of both recorded verbatim from the command. +2. A `ping` carrying `_meta` `2026-07-28` still returns `-32601`. The existing test at + `negotiation_test.exs:145` covers this and must not be edited to pass. +3. A `tools/list` carrying `_meta` `2025-11-25` carries **no** `resultType` and **no** + `_meta` `serverInfo`; the same request at `2026-07-28` carries both. +4. A `_meta` naming an unsupported revision still returns `-32022` with the supported list. +5. `./tools/gate.sh` exits 0, and every step's own line reads `pass`. +6. Two independent reviewer lanes, read-only, on a checkout of the index, report before merge. + +## Version + +`0.1.2`. **`0.1.1` is on `main` and was never published to Hex**, so bumping to `0.1.2` means +`0.1.1` will not exist as a release and its documentation fix ships inside `0.1.2`. The +`CHANGELOG` `0.1.1` section is left as written and the fact is appended under `0.1.2` rather +than rewritten. Flagged to the owner: if `0.1.1` is wanted as a release on its own, that is a +publish that has to happen before this slice merges, and it is an owner step either way. + +## Review binding + +**This repository has no `tools/signoff.sh`.** `tools/` contains `gate.sh` only. There is +therefore **no mechanical binding** between a reviewer's verdict and the bytes committed — no +`Reviewed-diff` trailer, no index-hash check, no hook that refuses an unreviewed commit. The +two lane verdicts are recorded in `slices/001b-ping-guard/` as text, and each lane prints the +tree hash it read into `logs/`, so the binding is *checkable by hand* and is *not enforced*. +Stated plainly rather than implied, because a signoff file that no tool consumes looks like a +control and is not one. diff --git a/slices/001b-ping-guard/REVIEW.md b/slices/001b-ping-guard/REVIEW.md new file mode 100644 index 0000000..9cc099a --- /dev/null +++ b/slices/001b-ping-guard/REVIEW.md @@ -0,0 +1,231 @@ + + +# Slice 001b — review record + +## There is no mechanical binding in this repository, and this file is not one + +`tools/` contains `gate.sh` and nothing else. **There is no `tools/signoff.sh`**, no +`Reviewed-diff` commit trailer, no index-hash check, and no hook that refuses a commit whose +diff no reviewer saw. Nothing in this repository's gates or CI reads this file. + +So: this is a **record**, not a control. It is checkable by hand and it is not enforced. Stated +first and plainly, because a file named `REVIEW.md` sitting next to a `PLAN.md` in a tree whose +sibling has a real signoff mechanism will be read as a control unless it says otherwise, and a +control that does not exist is worse than a known gap. + +What *is* mechanical, and is the closest thing here to a binding: + +- Both lanes reviewed a checkout of the **index**, not the working tree. What a lane can + attest is that it ran `git write-tree` in the checkout it read and got the hash below; that + the checkout was built by `git archive` into a directory created empty and verified empty is + the coding agent's step, which **no lane witnessed** (r1 round-3 finding 5). Separated because + a file whose first section is about not letting a record read as a control should not attribute + an unwitnessed step to the reviewers. +- Both lanes printed the tree hash they read, and both printed the same one, and it equalled + `git write-tree` on the staged index: + + round 1: a42f1b1e82599b203df0afcaaa8639203fd663d7 (r1 = r2 = index) + round 2: 867f28cecbf790f17e7a43747c74cbc3c5990033 (index at time of dispatch) + round 3: 7772c2a8d4bc6feefd96234c696ce4ccb9209d38 (index at time of dispatch) + round 4: see the commit; lib/ and test/ unchanged since 867f28ce + + Round 3's hash was missing from this list while the file described round 3 at length — + r2 round-3 finding 4. If the list is the binding, it carries every round it binds. + +- r1 re-ran `git write-tree` at the **end** of its round-1 review and got the same hash, so the + index did not move under it mid-review. That is the failure this practice exists to prevent. + +## Lanes + +Two, spawned by the coding agent, read-only, adversarial, and told to report findings rather +than edit. Neither edited a file under review. + +| lane | remit | +|---|---| +| r1 | correctness and specification conformance | +| r2 | security, contract, and evidence integrity | + +## Round 1 — both lanes: changes required + +Full reports, **written by each lane itself** into `logs/round1.r1.md` and `logs/round1.r2.md`. +They are archives in this project's sense: the bytes are the reviewer's bytes, because the +reviewer wrote the file. They were not transcribed by the coding agent, which could not have +labelled them verbatim if it had. r2's archive additionally names, in a header comment, the two +conversational lines it omitted — an omission declared rather than silent. + +**Neither lane raised a finding against `lib/`'s logic.** Quoting r2's round-1 close: "The +`lib/` change is correct, minimal, and I found nothing to fix in it." And r1's: "The fix itself +is correct, minimal, well-argued against the fetched spec, and genuinely demonstrated +red-before-green by mutation. Shape (A) is the right shape and I reach that independently." + +Both nonetheless returned **changes required**, on documentation and evidence: + +| # | lane | severity | what | +|---|---|---|---| +| 2.1 | r1 | **blocking** | the `@moduledoc` still stated the rule the diff deletes | +| 4 | r1 | non-blocking | `shutdown` through the new legacy branch was untested; every test discarded the returned state | +| 1c | r1 | non-blocking | a changelog-item-8 inference was presented beside two quoted MUSTs as if it were a third | +| 2.2 | r1 | non-blocking | the new README claim had two reachable counterexamples | +| 2.3 | r1 | note | `modernise/2` was handed the pre-recursion state | +| 6.1 | r1 | non-blocking | three counts in FINDINGS were typed fresh and wrong | +| 6.3 / 1 | r1 note, r2 non-blocking | `probe-after.txt` measured `0.1.1`, not the tree being shipped | +| 6.4 / 6 | both | note | the PLAN's fetch date was one day in the future, and the fetch had no archive | +| 2 | r2 | non-blocking | the README asserted an envelope invariant a one-command probe falsifies on a mandatory method | +| 3 | r2 | non-blocking | a wire-visible field removal shipped under `### Fixed` with no removal label | +| 4 | r2 | note | the README's "session: yes" is tracked and never enforced | +| 5 | r2 | note | the new clause comment overstated the clause's reach | +| 7 | r2 | note | a line-number citation stale in the merged tree | +| 8, 9 | r2 | note | gate REUSE population and `-32022` echo — both out of scope | + +The most useful finding is r1's 2.1, and it is worth naming why: round 1 fixed a comment that +contradicted the code, and left the **moduledoc** contradicting the code. Round 1's README +rewrite then committed the same class of error a second time (r1 2.2, r2 2) by replacing a +paragraph that overstated the rule with another paragraph that overstated it. A slice about a +comment that outlived its code reintroduced the defect twice while fixing it. That is the +argument for adversarial review stated better than any policy sentence. + +## Round 2 — a split verdict, which is not a pass + +Tree `867f28cecbf790f17e7a43747c74cbc3c5990033`. Full reports at `logs/round2.r1.md` and +`logs/round2.r2.md`, each written by its own lane. + + r1: VERDICT: approve (5 new findings, all non-blocking or note) + r2: VERDICT: changes required (1 blocking, 4 non-blocking) + +**A split is not a pass, and was not treated as one.** r2's blocking finding stood on its own +and was fixed before any signoff was contemplated. Recording the rule because the tempting +reading of "one approve, one changes-required" is that the approve carries it, and that reading +would have shipped the exact defect r2 found. + +**r2's blocking finding, and it is the sharpest in the slice.** Round 2 re-took +`logs/full-suite.txt` and `logs/green-negotiation.txt` to fix a round-1 finding that an archive +did not describe the tree it shipped with — and re-took them through `| tail -4`, which stripped +`mix test`'s first line (`Running ExUnit with seed: N, max_cases: M`). The counts were right. +The bytes were not the command's bytes. r2 proved it by `diff` against a fresh run (`1d0`) and +ruled out a configuration explanation before calling it, rather than assuming one. + +So: **the fix for a verbatim-archive finding was itself a verbatim-archive violation**, in the +file offered as proof. That is the family `CONVENTIONS.md` singles out as the worst, because a +filtered archive is indistinguishable from evidence. Neither the author nor r1 caught it; r1 had +re-run both commands and compared *counts*, which is exactly the check that passes over this +defect. It took a lane that compared *bytes*. + +**Both lanes independently found the same over-claim** — "three tests scored by mutation", +evidenced by one mutant — and both then ran the second mutation themselves and both concluded +the third test is unkillable in this diff's mutation space. Two lanes reaching one conclusion by +separate routes is the strongest signal either produced. + +**r2 also found an undisclosed `lib/` change** by mutation rather than by reading the record: +`modernise(response, state)` -> `modernise(response, next)`, whose mutant **survives the whole +suite**. Correctly a survivor — the change is unfalsifiable today and kept as defence against a +latent trap — but round 2's record claimed every change that round was documentation, evidence +or coverage, which the tree falsified. + +## Round 3 — bounded, on the delta + +Scope, fixed before the lanes were dispatched and written here beside the tree: + +1. `logs/full-suite.txt`, `logs/green-negotiation.txt`, `logs/gate.txt` re-taken with + `> file 2>&1` — a redirect, no pipe, no filter. +2. `logs/mutation.txt` added. **This was itself the third instance of the archive defect** — a + curated extract (its `mix test` piped through `grep -E`) carrying a label that claimed + captured output. Both lanes blocked on it in round 3. Round 4 deletes it for + `logs/mutation-a.txt` and `logs/mutation-b.txt`, each `mix test … > file 2>&1`, no pipe. +3. `logs/spec-legacy-basic.md` added — the third page, cited since round 2 and unarchived. +4. `FINDINGS.md`: the mutation sentence corrected to two-of-three; the undisclosed `lib/` change + disclosed and its surviving mutant recorded; the Green block's stale citations removed; the + `.md`-gap item extended to cover the three `spec-*.md` archives. +5. `CHANGELOG.md`: one clause saying `0.1.0` and `0.1.1` name the same before-state. +6. `PLAN.md`: three archived pages, not two. + +**No change to `lib/` or `test/` in round 3.** Both lanes' `lib/` conclusions therefore still +stand on bytes they read. + +## Round 3 — both lanes: changes required, converging on one file + + r1: VERDICT: changes required (1 blocking, 2 non-blocking, 3 notes) + r2: VERDICT: changes required (1 blocking, 2 non-blocking, 1 note) + +**Both lanes blocked on the same file, measured independently.** `logs/mutation.txt`, added *that +round to close the archive family*, was itself a curated extract: its `mix test` ran through +`grep -E`, and the label over it claimed captured output. r1 counted 13 lines stripped per block. + +**Why that is blocking and not cosmetic**, in the lanes' framing rather than mine: what was +dropped is the failure **body** — the assertion message, the `code:` line, the `stacktrace:` +line. Those lines are the evidence that the mutant was killed *by that assertion*, rather than by +a compile error or by nothing at all. Strip them and a killed mutant is indistinguishable on the +page from a suite that failed for an unrelated reason — which is the whole thing mutation scoring +is supposed to establish. + +r2 declined to soften it, and said why: an identical defect on a different file cannot be +blocking one round and a note the next, "or the standard is whatever the reviewer feels like that +morning." + +**r1 retracted its own round-2 approve**, unprompted: *"I checked numbers where the finding was +about bytes."* Recorded because a lane correcting itself against the standard is the review +mechanism working, and because it is the clearest statement of the method error that let instance +#2 through — the same method error that would have let #3 through. + +**Both lanes independently derived nine** headerless tracked `.md` files against a hand-written +count of five, and both observed the four omitted were the four that round added. Same population, +same number, two routes — measured rather than asserted. + +## Round 4 — the population swept, not the instance fixed + +The instruction that changed the approach: *a list is not a population*. Rounds 1-3 fixed one +archive per round and met the next one. Round 4 enumerates **every** file the record labels an +archive and classifies each by comparing it against a fresh capture — `logs/archive-sweep.txt` is +that sweep's own output. + +The sweep is now a tracked script, `tools/archive_sweep.sh`, and **it shows every comparison it +makes** — the diff, and the seed/timing normalisation where it applies one. Its first version +printed three of its verdicts as bare `echo` lines with no diff beneath them, which r2 (round 4, +finding 3) called the shape of evidence rather than evidence: the same family again, inside the +file written to close it. It also filed the three `spec-*.md` pages under "authored prose", which +would have excused never checking the only three files whose source lives outside the tree; they +are captures, and the script now re-fetches and diffs all three against upstream. + +Result, with the diff shown for each: `full-suite.txt`, `green-negotiation.txt` and `gate.txt` +raw and verified by byte diff, not by count. `mutation.txt` is deleted for `mutation-a.txt` and `mutation-b.txt`, each +`mix test … > file 2>&1` with no pipe, both mutations re-run from fresh copies with match counts +asserted and `mix compile --force` before scoring. + +**`probe-after.txt` is byte-identical to a fresh run of the now-tracked `tools/probe_ping.exs` +on a warm build.** Round 4 first recorded this as "differed only by carrying *more* lines", which +is backwards — r2 round-4 finding 1. The archive has **fewer** lines than a cold-build run, +because a cold run additionally emits dependency-compile output that no run of the probe itself +produces. The direction matters more than a wording slip: **fewer lines than the run is the +signature of filtering** — it is exactly what instances #2 and #3 looked like — so it can never +be an acquittal on its own. What acquits this file is the byte-identical match against a warm +run, which is the strongest verdict any file in the slice has. The corrected reasoning is now +printed by the sweep itself rather than only asserted here. Tracking the probe closes r1's +finding 6 rather than only recording it. **Four of the five run-logs are regenerable from the +tree; `red.txt` is not, and correctly so** — it is the failing state *before* the fix, so +regenerating it would mean reverting `lib/`. Round 5 said "all five", wrong by one and in the +direction that flatters: tracking the probe moved one log across, not two. r1's round-3 report +had said four of five *and named the exception*; the record adopted the number and dropped the +exception (r1 round-5, finding 2) — the same defect as adopting r2's "four of five" without +re-deriving it. The `round*.md` files are authored by +their own lanes and the `spec-*.md` files are `curl -o` output; neither is labelled a command +capture of something it is not. + +Record accuracy fixed with it: the attribution above; the severity cell; the forward-reference at +`FINDINGS.md:92` that still said "scored by mutation below" while the text below corrected it; +the `.md` population now derived by command; and `FINDINGS.md` gained the rounds-3-and-4 section +it lacked, so the file that asserts every `logs/` file is a command's bytes now records the three +rounds in which that was not true. + +**No change to `lib/` or `test/` in rounds 3 or 4** — `git diff 867f28ce -- lib +test` is empty. Both lanes' `lib/` conclusions rest on bytes they read at `867f28ce`; that +sentence is the coding agent's inference from the empty diff, not a lane's attestation. + +Verdicts land in `logs/round4.r1.md` and `logs/round4.r2.md`. **If those files are absent, round +4 did not complete and this slice is not signed off.** Read absence as absence; this file is a +record of what was reviewed, never a substitute for a verdict. + +## What the coding agent did not do + +It did not review its own diff, and it did not commit anything on a changes-required verdict. diff --git a/slices/001b-ping-guard/logs/archive-sweep.txt b/slices/001b-ping-guard/logs/archive-sweep.txt new file mode 100644 index 0000000..5840617 --- /dev/null +++ b/slices/001b-ping-guard/logs/archive-sweep.txt @@ -0,0 +1,144 @@ +=== POPULATION, derived from the tracked set rather than listed === + slices/001b-ping-guard/logs/archive-sweep.txt + slices/001b-ping-guard/logs/full-suite.txt + slices/001b-ping-guard/logs/gate.txt + slices/001b-ping-guard/logs/green-negotiation.txt + slices/001b-ping-guard/logs/mutation-a.txt + slices/001b-ping-guard/logs/mutation-b.txt + slices/001b-ping-guard/logs/probe-after.txt + slices/001b-ping-guard/logs/red.txt + slices/001b-ping-guard/logs/round1.r1.md + slices/001b-ping-guard/logs/round1.r2.md + slices/001b-ping-guard/logs/round2.r1.md + slices/001b-ping-guard/logs/round2.r2.md + slices/001b-ping-guard/logs/round3.r1.md + slices/001b-ping-guard/logs/round3.r2.md + slices/001b-ping-guard/logs/round4.r1.md + slices/001b-ping-guard/logs/round4.r2.md + slices/001b-ping-guard/logs/round5.r1.md + slices/001b-ping-guard/logs/round5.r2.md + slices/001b-ping-guard/logs/round6.r1.md + slices/001b-ping-guard/logs/round6.r2.md + slices/001b-ping-guard/logs/spec-basic-versioning.md + slices/001b-ping-guard/logs/spec-changelog.md + slices/001b-ping-guard/logs/spec-legacy-basic.md + +Two kinds of file live here, and only one kind can be diffed against a command: + CAPTURES - a command wrote them; re-run the command and compare bytes. + Includes the spec-*.md files: 'curl -o' IS the command and the + upstream page IS the source, so they are checkable, not prose. + AUTHORED - the round*.md lane reports. Each was written by the reviewer that + is its source. Nothing to re-run; they must simply never be + labelled the output of a command. + +=== warming the build so comparisons do not depend on _build state === + $ mix compile --force ; mix test --exclude all (output discarded; only the + build state matters here, and a cold build emits compile lines no archive contains) + +=== CAPTURES: test and gate logs === +-- full-suite.txt: diff vs a fresh 'mix test', seed+timing normalised on BOTH sides -- + comparison: 0 differing line(s), diff exit=0 + => full-suite.txt RAW (0 differing lines above; seed/timing/compile normalised) + +-- green-negotiation.txt: same command, same normalisation -- + comparison: 0 differing line(s), diff exit=0 + => green-negotiation.txt RAW (0 differing lines above) + +-- gate.txt: no normalisation, the gate emits nothing variable -- + comparison: 0 differing line(s), diff exit=0 + => gate.txt RAW (0 differing lines above; no normalisation applied) + +=== CAPTURES: the probe === +-- probe-after.txt vs a WARM fresh run of the tracked probe, no normalisation -- + comparison: 0 differing line(s), diff exit=0 + => probe-after.txt RAW (byte-identical to a warm run) + NOTE, and the direction matters: against a COLD _build the same command emits extra + dependency-compile lines, so the archive would have FEWER lines than that run. + Fewer-lines-than-the-run is the SIGNATURE OF FILTERING -- it is exactly what was + found in instances #2 and #3 -- so it is never on its own an acquittal. What + acquits this file is the byte-identical match against a warm run above. + +=== CAPTURES: red.txt, the red half of red-before-green === + RESTORED in round 6. The round-4 sweep classified this file; the round-5 rewrite + enumerated it and classified it nowhere, so a reader scanning for DIFFERS got a clean + bill over a population the instrument had not finished. An unclassified file is not a + RAW file. That is CONVENTIONS.md's 'proves nothing, and proves it quietly' shape, and + it is the coverage regression r2 blocked round 5 on -- inside the round that promised + the population. + Not re-runnable here: it is the failing state BEFORE the fix, and lib/ is now fixed. + Reproducing it needs lib/beam_mcp/server.ex reverted to base/main, which this script + must not do to the working tree. Checked instead for the marks a filtered capture + cannot have: + seed banner : 1 + stacktrace: : 2 + code: : 2 + Finished in : 1 + tests, line : 12 tests, 2 failures + => red.txt RAW (banner + code: + stacktrace: + Finished in, all present) + +=== CAPTURES: the two mutation logs === +-- mutation-a.txt -- + not re-run here: reproducing it needs a mutated copy of lib/, which this script + must not create in the working tree. Checked instead for the marks a filtered + capture cannot have -- the ExUnit banner and a complete failure body: + seed banner : 1 + stacktrace: : 1 + code: : 1 + Finished in : 1 + tests, line : 15 tests, 1 failure + => mutation-a.txt RAW (banner + code: + stacktrace: + Finished in, all present) +-- mutation-b.txt -- + not re-run here: reproducing it needs a mutated copy of lib/, which this script + must not create in the working tree. Checked instead for the marks a filtered + capture cannot have -- the ExUnit banner and a complete failure body: + seed banner : 1 + stacktrace: : 1 + code: : 1 + Finished in : 1 + tests, line : 15 tests, 1 failure + => mutation-b.txt RAW (banner + code: + stacktrace: + Finished in, all present) + +=== CAPTURES: the three specification pages, re-fetched and diffed against upstream === +These are the only files whose source lives OUTSIDE the tree, so they are the only +ones a diff can check against an independent authority. Grouping them with prose +(the first version of this script did) is what would excuse never checking them. + comparison: 0 differing line(s), diff exit=0 + => spec-basic-versioning.md RAW (re-fetched from https://modelcontextprotocol.io/specification/2026-07-28/basic/versioning.md) + comparison: 0 differing line(s), diff exit=0 + => spec-changelog.md RAW (re-fetched from https://modelcontextprotocol.io/specification/2026-07-28/changelog.md) + comparison: 0 differing line(s), diff exit=0 + => spec-legacy-basic.md RAW (re-fetched from https://modelcontextprotocol.io/specification/2025-11-25/basic.md) + +=== AUTHORED: the lane reports === + round1.r1.md written by its own reviewer lane; not a command capture + round1.r2.md written by its own reviewer lane; not a command capture + round2.r1.md written by its own reviewer lane; not a command capture + round2.r2.md written by its own reviewer lane; not a command capture + round3.r1.md written by its own reviewer lane; not a command capture + round3.r2.md written by its own reviewer lane; not a command capture + round4.r1.md written by its own reviewer lane; not a command capture + round4.r2.md written by its own reviewer lane; not a command capture + round5.r1.md written by its own reviewer lane; not a command capture + round5.r2.md written by its own reviewer lane; not a command capture + round6.r1.md written by its own reviewer lane; not a command capture + round6.r2.md written by its own reviewer lane; not a command capture + +=== archive-sweep.txt itself === + A file cannot diff itself while being written, so this entry NAMES ITS CHECK rather + than asserting a conclusion -- the thing this script's own header forbids: + script sha256 : de9747241aa99b48a936e79c232edbac91f18e824b94ecf025353be45b5bcb54 + reproduce : ./tools/archive_sweep.sh > slices/001b-ping-guard/logs/archive-sweep.txt 2>&1 + then diff that against the tracked file. A reader who doubts any verdict above + re-runs that one line; the script is tracked, so the bytes that produced this + output are in the tree next to it. + => archive-sweep.txt RAW (self: named check above, not an assertion) + +=== CLOSING TALLY -- the structural fix, not an instance fix === + Round 5 enumerated red.txt and classified it nowhere: 19 listed, 18 classified, and + the output still read as a clean sweep because nothing counted. A file could drop out + QUIETLY -- CONVENTIONS.md's own worst shape, and this script's header says a list is + not a population. So the population and the classifications are now counted and + compared, and disagreement is a FAILURE of this script rather than a silent gap. + enumerated : 23 + classified : 23 (11 verdicts + 12 authored lane reports) + => TALLY BALANCES: every enumerated file is classified. diff --git a/slices/001b-ping-guard/logs/full-suite.txt b/slices/001b-ping-guard/logs/full-suite.txt new file mode 100644 index 0000000..6e3ef2d --- /dev/null +++ b/slices/001b-ping-guard/logs/full-suite.txt @@ -0,0 +1,5 @@ +Running ExUnit with seed: 627805, max_cases: 64 + +....................................... +Finished in 1.1 seconds (0.06s async, 1.1s sync) +39 tests, 0 failures diff --git a/slices/001b-ping-guard/logs/gate.txt b/slices/001b-ping-guard/logs/gate.txt new file mode 100644 index 0000000..fcc9078 --- /dev/null +++ b/slices/001b-ping-guard/logs/gate.txt @@ -0,0 +1,8 @@ +== beam_mcp gate == + format pass + compile pass + test pass + credo pass + reuse pass (19 commentable files) + licence files pass +Gate OK. diff --git a/slices/001b-ping-guard/logs/green-negotiation.txt b/slices/001b-ping-guard/logs/green-negotiation.txt new file mode 100644 index 0000000..76335f1 --- /dev/null +++ b/slices/001b-ping-guard/logs/green-negotiation.txt @@ -0,0 +1,5 @@ +Running ExUnit with seed: 324065, max_cases: 64 + +............... +Finished in 0.05 seconds (0.05s async, 0.00s sync) +15 tests, 0 failures diff --git a/slices/001b-ping-guard/logs/mutation-a.txt b/slices/001b-ping-guard/logs/mutation-a.txt new file mode 100644 index 0000000..ba60619 --- /dev/null +++ b/slices/001b-ping-guard/logs/mutation-a.txt @@ -0,0 +1,16 @@ +Compiling 5 files (.ex) +Generated beam_mcp app +Running ExUnit with seed: 814630, max_cases: 64 + +... + + 1) test state threads through both era branches shutdown declaring 2025-11-25 through _meta still sets shutdown? (BeamMCP.NegotiationTest) + test/beam_mcp/negotiation_test.exs:184 + the legacy branch returns the recursion's tuple whole; if it returned the pre-recursion state instead, the transport would never stop + code: assert Server.shutdown?(send_for_state(legacy_meta("shutdown"))), + stacktrace: + test/beam_mcp/negotiation_test.exs:185: (test) + +........... +Finished in 0.03 seconds (0.03s async, 0.00s sync) +15 tests, 1 failure diff --git a/slices/001b-ping-guard/logs/mutation-b.txt b/slices/001b-ping-guard/logs/mutation-b.txt new file mode 100644 index 0000000..9b67b06 --- /dev/null +++ b/slices/001b-ping-guard/logs/mutation-b.txt @@ -0,0 +1,28 @@ +Compiling 5 files (.ex) +Generated beam_mcp app +Running ExUnit with seed: 924753, max_cases: 64 + +.... + + 1) test state threads through both era branches shutdown declaring 2026-07-28 through _meta still sets shutdown? (BeamMCP.NegotiationTest) + test/beam_mcp/negotiation_test.exs:190 + Expected truthy, got false + code: assert Server.shutdown?(send_for_state(modern("shutdown"))) + arguments: + + # 1 + %{ + server_name: "beam_mcp", + dispatch: #Function<0.370214/3 in BeamMCP.NegotiationTest.state/0>, + dispatch_opts: [], + initialized?: false, + shutdown?: false, + tool_catalog: BeamMCP.NegotiationTest.Catalog + } + + stacktrace: + test/beam_mcp/negotiation_test.exs:191: (test) + +.......... +Finished in 0.03 seconds (0.03s async, 0.00s sync) +15 tests, 1 failure diff --git a/slices/001b-ping-guard/logs/probe-after.txt b/slices/001b-ping-guard/logs/probe-after.txt new file mode 100644 index 0000000..b2278de --- /dev/null +++ b/slices/001b-ping-guard/logs/probe-after.txt @@ -0,0 +1,14 @@ +beam_mcp version: 0.1.2 + +ping + _meta 2026-07-28 + -> {"error":{"code":-32601,"message":"Method not found: ping"},"id":1,"jsonrpc":"2.0"} +ping + _meta 2025-11-25 + -> {"id":1,"jsonrpc":"2.0","result":{}} +ping + _meta, no version key + -> {"id":1,"jsonrpc":"2.0","result":{}} +ping bare + -> {"id":1,"jsonrpc":"2.0","result":{}} +tools/list + _meta 2025-11-25 + -> {"id":2,"jsonrpc":"2.0","result":{"tools":[{"annotations":{"destructiveHint":false,"idempotentHint":true,"openWorldHint":false,"readOnlyHint":true},"description":"Echo.","inputSchema":{"additionalProperties":true,"properties":{},"type":"object"},"name":"echo"}]}} +tools/list + _meta 2026-07-28 + -> {"id":2,"jsonrpc":"2.0","result":{"_meta":{"io.modelcontextprotocol/serverInfo":{"name":"beam_mcp","version":"0.1.2"}},"resultType":"complete","tools":[{"annotations":{"destructiveHint":false,"idempotentHint":true,"openWorldHint":false,"readOnlyHint":true},"description":"Echo.","inputSchema":{"additionalProperties":true,"properties":{},"type":"object"},"name":"echo"}]}} diff --git a/slices/001b-ping-guard/logs/red.txt b/slices/001b-ping-guard/logs/red.txt new file mode 100644 index 0000000..0d5f307 --- /dev/null +++ b/slices/001b-ping-guard/logs/red.txt @@ -0,0 +1,38 @@ +==> file_system +Compiling 7 files (.ex) +Generated file_system app +==> bunt +Compiling 2 files (.ex) +Generated bunt app +==> jason +Compiling 10 files (.ex) +Generated jason app +==> credo +Compiling 257 files (.ex) +Generated credo app +==> beam_mcp +Compiling 5 files (.ex) +Generated beam_mcp app +Running ExUnit with seed: 719196, max_cases: 64 + +....... + + 1) test the result envelope follows the declared revision, not the carrier a result for a request declaring 2025-11-25 carries neither (BeamMCP.NegotiationTest) + test/beam_mcp/negotiation_test.exs:186 + resultType was added in 2026-07-28; the spec says clients MUST treat results from earlier-protocol servers that omit it as "complete", so emitting it on a 2025-11-25 result claims a revision the client did not ask for + code: refute r["result"]["resultType"], + stacktrace: + test/beam_mcp/negotiation_test.exs:191: (test) + +.. + + 2) test ping — answered at legacy, absent at modern a ping declaring 2025-11-25 through _meta is answered (BeamMCP.NegotiationTest) + test/beam_mcp/negotiation_test.exs:167 + ping exists in 2025-11-25. This server advertises 2025-11-25 in server/discover and lists it in the -32022 `supported` payload, and the specification tells a client to pick from that list and retry the request — which produces this message. Refusing it refuses a revision we advertise. + code: assert r["result"] == %{}, + stacktrace: + test/beam_mcp/negotiation_test.exs:170: (test) + +. +Finished in 0.03 seconds (0.03s async, 0.00s sync) +12 tests, 2 failures diff --git a/slices/001b-ping-guard/logs/round1.r1.md b/slices/001b-ping-guard/logs/round1.r1.md new file mode 100644 index 0000000..089045a --- /dev/null +++ b/slices/001b-ping-guard/logs/round1.r1.md @@ -0,0 +1,231 @@ +From: beam_mcp · Reviewer lane r1 +To: beam_mcp · Coding Agent +Re: slice 001b-ping-guard, round 1, correctness and specification conformance +Type: Report + +## Tree read + +``` +$ cd /home/aylac/Projects/beam_mcp-wt/001b-review && git write-tree +a42f1b1e82599b203df0afcaaa8639203fd663d7 +``` + +Written to `/home/aylac/Projects/beam_mcp-wt/001b-review/logs-r1.tree`. Re-checked at the end of the review: `git write-tree` still `a42f1b1e82599b203df0afcaaa8639203fd663d7`, so the index did not move under me. Only untracked files present are `logs-r1.tree` and `logs-r2.tree`. + +Spec fetched, not recalled, on 2026-09-06: `.../2026-07-28/basic/versioning`, `.../2026-07-28/changelog`, and `.../2025-11-25/basic/index`. + +--- + +## 1. Is the chosen behaviour right? (A) yes; rejection of (B) holds; rejection of (C) is right on design but is **not** the MUST the record implies + +**Severity: note (two sub-points), one non-blocking (1c).** + +**(a) (A) is defensible, and I reach that independently.** The versioning page says "Every request declares the protocol version it is using in its `_meta` field" and "If the server does not implement the requested version ... it **MUST** respond with an `UnsupportedProtocolVersionError` listing the versions it does support", with the page's own example carrying `"supported": ["2026-07-28", "2025-11-25"]`, and "The client **SHOULD** select a mutually supported version from the `supported` list and retry the request." This server *does* implement `2025-11-25`, and says so twice — verified live, not read: + +``` +1. server/discover + _meta modern + -> {"result":{"protocolVersions":["2026-07-28","2025-11-25"],...}} +18. _meta version = null + -> {"error":{"code":-32022,"data":{"requested":null,"supported":["2026-07-28","2025-11-25"]},...}} +``` +(`mix run` probe against the reviewed `server.ex`, full output below in §4.) + +**(b) (B) is incoherent for *this* server, so its rejection holds.** Answering `-32022` to a `_meta` naming `2025-11-25` would be a response whose own `data.supported` field asserts support for the version the same response is refusing. The one sentence that could support (B) — "A request carrying modern per-request `_meta` is served statelessly according to this revision" — sits under *Backward Compatibility with Initialization-Based Versions*, in a bullet pair whose contrast is **stateless vs. session** ("An `initialize` request selects legacy semantics, scoped to the stdio process (stdio) or the session (HTTP)"). PLAN.md:137-145 reads it as fixing statelessness, not the revision. I agree, and I add the argument the PLAN does not make: under (B) the spec-prescribed retry loop is non-terminating *against this server's own advertisement*, which the spec cannot intend. + +**(c) The rejection of (C) is right, but the record overstates its basis. Non-blocking.** +`slices/001b-ping-guard/FINDINGS.md:51-53` says the `2026-07-28` changelog item 8 MUST "is only coherent if an earlier-revision result omits it". That is an inference, presented adjacent to two verbatim quoted MUSTs. Two spec facts cut against reading it as normative: +- Changelog item 8's MUST is addressed to **clients** ("Clients **MUST** treat results from earlier-protocol servers that omit the field as `"complete"`"), not to servers, and it governs *omission*, not *emission*. +- `2025-11-25`'s own base-protocol page states of a result response: "The `result` **MAY** follow any JSON object structure." `_meta` is a reserved-but-permitted property in that revision. So shape (C) — keeping `resultType` and `_meta` `serverInfo` on a `2025-11-25` result — would have violated **no** normative requirement in either revision. + +So (C) loses on honesty (it decorates a result with fields the declared revision does not define), not on conformance. (A) remains the right shape; the FINDINGS sentence should be softened to say so. No different shape is right. + +--- + +## 2. Does the code do what the PLAN and CHANGELOG say? + +### Finding 2.1 — **BLOCKING.** The moduledoc still states the rule this diff deletes + +`lib/beam_mcp/server.ex:16-18` (unchanged by the diff; its truth-value was flipped by it): + +> a request carrying per-request `_meta` is served statelessly under **the modern revision**, and an `initialize` request selects legacy semantics. + +**Observed:** after this change a `_meta` naming `2025-11-25` is served under the **legacy** revision — that is the entire point of the slice. **Expected:** the module's published documentation says what the module does. This is the `@moduledoc`, i.e. the hexdocs front page for `BeamMCP.Server`; it is the highest-visibility statement of this rule in the package, and it now asserts the pre-fix behaviour. The inline clause comment (`server.ex:119-124`) and `README.md` were both updated; the moduledoc was missed. + +This is exactly the defect class the slice exists to close. `FINDINGS.md:19-21` describes the bug as "the comment named `2026-07-28`; the code names no revision". Shipping a moduledoc that names the modern revision while the code no longer does is the same mismatch, one file up. `CONVENTIONS.md:8` — "each entry exists because something went wrong once" — and PLAN.md in-scope item 3 (documentation of the era rule) both put this inside the slice, not outside it. + +``` +$ sed -n '16,18p' lib/beam_mcp/server.ex + It serves `2026-07-28` and `2025-11-25`, and tells them apart the way the specification says + a dual-era server should: a request carrying per-request `_meta` is served statelessly under + the modern revision, and an `initialize` request selects legacy semantics. A request naming +$ git diff base/main HEAD -- lib/beam_mcp/server.ex | grep -c '^@@ -1[0-9][0-9]' +1 # the only hunk starts at line 116; the moduledoc is untouched +``` + +### Finding 2.2 — non-blocking. Two clause-ordering counterexamples falsify the newly-added README claim + +`README.md:101-103` (new in this diff): "**A revision, not a carrier, decides the semantics.** ... Which revision the `_meta` *names* then decides **the method table and the result envelope**." + +Both halves have a reachable counterexample, because `server/discover` (`server.ex:92`) and `initialize` (`server.ex:102`) are matched **before** the `_meta` clause (`server.ex:125`), and their patterns permit an extra `_meta` key: + +``` +# method table: `initialize` is removed in 2026-07-28, and README.md:99 says it is "at legacy only" +4. initialize + _meta modern (params protocolVersion 2026-07-28) + resp -> {"result":{"protocolVersion":"2026-07-28","capabilities":{...},"serverInfo":{...}},"id":1,...} + shutdown?-> false initialized?-> true + +# result envelope: server/discover is MANDATORY in 2026-07-28 and its result carries neither decoration +1. server/discover + _meta modern + resp -> {"id":1,"jsonrpc":"2.0","result":{"capabilities":{...},"protocolVersions":[...],"serverInfo":{...}}} +``` + +Observed: a request declaring `2026-07-28` gets a successful `initialize` handshake claiming `2026-07-28` — a revision in which `initialize` does not exist — and it flips `initialized?` to `true`, i.e. a request that declared the *stateless* revision mutates session state. And a modern `server/discover` result carries no `resultType`, which changelog item 8 makes required on all results ("All results now carry a required `resultType` field"). Expected per the new README row at `README.md:96` and paragraph at 101-103: `resultType` and `_meta` `serverInfo` on every `2026-07-28` result. + +**Both behaviours are pre-existing** (identical clause order at `base/main`) and are legitimately out of this slice's scope. What is *in* scope is that PLAN.md:151 puts README in scope precisely because it "currently states the intended rule and not the shipped one" — and the replacement text has the same property for two of the six methods the same page lists. Either qualify the paragraph ("except `server/discover` and `initialize`, which are matched before the `_meta` clause") or record the two counterexamples under "Out of scope, recorded rather than fixed". Neither is recorded now. + +### Finding 2.3 — no defect. State threading through both new branches is correct + +The brief asked specifically about `shutdown`. Measured, not reasoned: + +``` +6. shutdown + _meta legacy + resp -> {"id":1,"jsonrpc":"2.0","result":{}} + shutdown?-> true initialized?-> false +7. shutdown + _meta modern + resp -> {"result":{"_meta":{...serverInfo...},"resultType":"complete"},...} + shutdown?-> true initialized?-> false +12. exit (no id) + _meta modern + resp -> nil (no response) + shutdown?-> true initialized?-> false +``` + +The legacy branch (`server.ex:145`) returns the recursion's tuple whole, so `next` is propagated. The modern branch (`server.ex:138-139`) destructures and returns `next`. Correct in both. + +**Note (not a finding):** `server.ex:139` passes the **pre-recursion** `state` to `modernise/2`, not `next`. Harmless today — `modernise/2` reads only `state.server_name`, which no handler mutates — but it is a latent trap if the server name ever becomes mutable. Cheap to change to `next`. + +### Finding 2.4 — no undisclosed silent behaviour change + +I enumerated every path the rewritten clause can take and compared before/after. The only behaviour deltas are (i) `ping` at legacy `_meta`, and (ii) the removal of the decorations for every method reaching the legacy branch — which the CHANGELOG covers with `ping` and `tools/list` as exemplars. `shutdown` and `tools/call` also lose their decorations (probes 6 and 8) and are not individually named, but they are instances of the stated rule, not separate changes. Errors were never modernised (`modernise/2` only matches `%{"result" => payload}`), before or after — verified at probes 9 and 16. Notifications (no `id`) never entered the clause, before or after — probe 10. + +**Both CHANGELOG "before" strings reproduce exactly.** Not taken on trust — measured by reverting `server.ex` to `base/main` in an isolated copy: + +``` +=== BEFORE (server.ex = base/main) === +ping + _meta 2025-11-25 -> {"error":{"code":-32601,"message":"Method not found: ping"},"id":1,"jsonrpc":"2.0"} +tools/list + _meta 2025-11-25 -> {"id":2,...,"result":{"_meta":{"io.modelcontextprotocol/serverInfo":{...}},"resultType":"complete","tools":[...]}} +=== AFTER (server.ex = reviewed) === +ping + _meta 2025-11-25 -> {"id":1,"jsonrpc":"2.0","result":{}} +tools/list + _meta 2025-11-25 -> {"id":2,"jsonrpc":"2.0","result":{"tools":[...]}} +``` + +--- + +## 3. Are the new tests real? Yes — verified by mutation, two of the three + +Method, per the brief: fresh directory created and verified empty (`entry count: 0`), populated by `git archive HEAD | tar -x` (index bytes, not worktree), `deps/`+`_build/` copied, `git init`. Nothing under `deps/` was mutated, so the `deps.compile --force` caveat does not apply. Mutation asserted applied before scoring: + +``` +--- diff line count: 42 (must be > 0) +=== confirm mutant server.ex == base/main:server.ex === +0f649f35823983fbaa27822abd12a90cbbaaed9930d4f9e1b37df1b64922698c - +0f649f35823983fbaa27822abd12a90cbbaaed9930d4f9e1b37df1b64922698c .../mutant/lib/beam_mcp/server.ex +``` + +Control (unmutated copy): `36 tests, 0 failures`, `exit=0`. + +Mutant (`lib/beam_mcp/server.ex` reverted to `base/main`, everything else at the reviewed index): + +``` + 1) test ... a ping declaring 2025-11-25 through _meta is answered + test/beam_mcp/negotiation_test.exs:167 + 2) test ... a result for a request declaring 2025-11-25 carries neither + test/beam_mcp/negotiation_test.exs:186 +12 tests, 2 failures +exit=2 +36 tests, 2 failures # full suite +``` + +Byte-for-byte the same two failures, with the same messages, as `slices/001b-ping-guard/logs/red.txt`. The tests are real and the recorded red is reproducible. + +The **third** new test — `negotiation_test.exs:179`, "a 2026-07-28 result carries resultType and serverInfo `_meta`" — passes at `base/main`. It is a regression guard, not a red. That is fine and desirable; it is the source of the miscount in Finding 6.1. + +--- + +## 4. Under-tested: `shutdown` through the new `@legacy_version` branch + +**Severity: non-blocking.** + +`negotiation_test.exs:43` — `defp send_msg(msg), do: state() |> Server.handle_message(msg) |> elem(1)` — **discards the returned state**. Every test in the file, new and old, throws the state away. So the new `@legacy_version` branch at `server.ex:142-145` returns the recursion's state tuple whole and **no test asserts that it does**. `shutdown` is the specific reachable input: it is the only request method that changes state, it reaches the new branch, and nothing covers it. + +I verified the behaviour is correct (probe 6, above) — this is a coverage gap, not a bug. A one-line test that keeps `elem(0)` and asserts `Server.shutdown?/1` after a `shutdown` carrying legacy `_meta` closes it. Also uncovered but lower value: `tools/call` at legacy `_meta` (probe 8, correct), and the legacy branch's `-32601` for an unknown method (probe 9, unchanged). + +Full probe output (18 inputs, run against the reviewed `server.ex`) is at `/tmp/claude-1000/-home-aylac-Projects-hacktui-hermes/775c8d71-6ac1-4653-8798-382001e76089/scratchpad/r1/`. + +--- + +## 5. The gate — read per step, not by exit code + +``` +$ cd /home/aylac/Projects/beam_mcp-wt/001b-review && ./tools/gate.sh; echo "gate exit=$?" +== beam_mcp gate == + format pass + compile pass + test pass + credo pass + reuse pass (17 commentable files) + licence files pass +Gate OK. +gate exit=0 +``` + +All six lines read `pass`; no step printed `pass` while a `FAIL` line appeared elsewhere. Acceptance criterion 5 is met. Byte-identical to `slices/001b-ping-guard/logs/gate.txt`. Note that the `reuse` step derives its population from `git ls-files`, so my untracked `logs-r1.tree` is invisible to it and could not have skewed the `17` — which matches the archived count exactly. + +--- + +## 6. Are the FINDINGS claims supported? Mostly yes; three counts are wrong + +### Finding 6.1 — non-blocking. Three typed-fresh counts in FINDINGS.md are wrong + +`CONVENTIONS.md:70` — "Counts are quoted from command output, never typed fresh." These three were not. + +**(a) `FINDINGS.md:64`** — "Both new tests failed; the **ten** pre-existing tests passed, so the red is the **two** additions and not a broken file." + +Observed: there are **three** new tests and **nine** pre-existing ones. +``` +$ git show base/main:test/beam_mcp/negotiation_test.exs | grep -c '^\s*test ' +9 +$ grep -c '^\s*test ' test/beam_mcp/negotiation_test.exs +12 +``` +The sentence's arithmetic (10 + 2 = 12) is self-consistent and still lands on a true total, which is exactly why it survived. The correct statement is: three additions, two of which are red at `base/main` and one of which (`:179`) is green there as a regression guard. + +**(b) `FINDINGS.md:104`** — "**Four** edits, each applied by a Python replace...". The table immediately under it has **six** rows. + +**(c)** consequently `FINDINGS.md:113`/`114` list `mix.exs` and `CHANGELOG.md` rows that the "four" does not account for. + +### Finding 6.2 — spot-checks that hold + +Re-run by me, not taken on trust: +- `36 tests, 0 failures` (`logs/full-suite.txt`) — reproduced: control run, `exit=0`. ✔ +- `12 tests, 0 failures` (`logs/green-negotiation.txt`) — reproduced. ✔ +- `12 tests, 2 failures` (`logs/red.txt`) — reproduced by mutation, same two tests, same messages. ✔ +- gate, six `pass` lines, `17 commentable files` (`logs/gate.txt`) — reproduced byte-identical. ✔ +- "the pre-existing test at `negotiation_test.exs:145` was not edited" — true; it is now at `:160` and its body is unchanged (`git diff base/main HEAD -- test/` shows only additions, no `-` line in that describe block). Acceptance criterion 2 is met by an unmodified assertion. ✔ + +### Finding 6.3 — note. `logs/probe-after.txt` predates the `mix.exs` bump + +`logs/probe-after.txt` line 3 reads `beam_mcp version: 0.1.1`, and its modern `tools/list` result carries `"version":"0.1.1"`. The reviewed tree's `mix.exs:7` is `0.1.2`, and `@server_version` is read from it (`server.ex:49`), so re-running the same probe now yields `0.1.2`. The log is a genuine command archive of a real intermediate state (fix applied, version not yet bumped), not a transcription — consistent with `CONVENTIONS.md:73-79`. But `FINDINGS.md`'s "## Green" section quotes it as the post-fix state without saying the version bump came after, and a reader diffing the log against the tree will find a version string that exists nowhere in the reviewed bytes. One sentence would close it. Same applies to the CHANGELOG's "Measured against `0.1.1`" block, which is accurate but is the pre-bump run. + +### Finding 6.4 — note. PLAN fetch date is one day in the future + +`PLAN.md:12` — "fetched on **2026-09-07**". Today is 2026-09-06. Probably a timezone or typo; recorded because a fetch date is the load-bearing part of the claim that the `2026-07-28` text was fetched rather than recalled. I independently re-fetched both pages today and every quoted line in `PLAN.md:85-108` matches the live text verbatim, so the substance is sound. + +--- + +## Summary + +The fix itself is correct, minimal, well-argued against the fetched spec, and genuinely demonstrated red-before-green by mutation. Shape (A) is the right shape and I reach that independently. State threading is right in both new branches; no silent behaviour change is undisclosed. The gate is green on every line. + +One blocking item: the `@moduledoc` at `lib/beam_mcp/server.ex:16-18` — the module's published documentation — still states the pre-fix rule this diff deletes. That is a two-line edit in a file already in scope, and it is the same doc/code mismatch the slice was written to close. + +VERDICT: changes required diff --git a/slices/001b-ping-guard/logs/round1.r2.md b/slices/001b-ping-guard/logs/round1.r2.md new file mode 100644 index 0000000..d930bd1 --- /dev/null +++ b/slices/001b-ping-guard/logs/round1.r2.md @@ -0,0 +1,199 @@ + + +From: beam_mcp · Reviewer lane r2 +To: beam_mcp · Coding Agent +Re: slice 001b-ping-guard, round 1, security, contract and evidence integrity +Type: Report + +**Tree read:** `a42f1b1e82599b203df0afcaaa8639203fd663d7` + +``` +$ cd /home/aylac/Projects/beam_mcp-wt/001b-review && git write-tree +a42f1b1e82599b203df0afcaaa8639203fd663d7 +``` +Written to `/home/aylac/Projects/beam_mcp-wt/001b-review/logs-r2.tree`. No file under review was modified; all probes ran either in this throwaway checkout or in a copy at `/r2/before/` built with `tar` + `git show base/main:…` (no `.git`, own `_build`). + +--- + +## Answer to the security question first, because it is clean + +**The change does not widen the attack surface.** `tools/call` was *already* reachable through `_meta` naming `2025-11-25` at `base/main`, because the old `cond` at `lib/beam_mcp/server.ex:124` (base) tested `version not in @supported_versions`, and `2025-11-25` **is** in `@supported_versions` (`server.ex:42`). Only `ping` took the refusal branch; everything else fell to `true ->` and was served. So the new `@legacy_version` branch at `server.ex:142-145` adds exactly one newly-reachable method — `ping`, which returns `result(id, %{})` at `server.ex:156-158` and touches no state, no catalog and no dispatch. + +Both branches converge on the same call: `handle_message(state, bare)` (`server.ex:138` modern, `server.ex:145` legacy) → the `tools/call` clause at `server.ex:165-192` → `validate_and_dispatch/3` at `server.ex:282-292` → `Schema.validate/2` before `state.dispatch.(…)`. Validation is not merely "still applied" — it is the *same* code path with no version-dependent branch anywhere between the era switch and the dispatch call. Demonstrated, identical rejections on both branches and at both refs: + +``` +$ mix run /r2/probe_r2.exs # in the review checkout, 0.1.2 +tools/call legacy _meta, INVALID args (missing required) + -> {"id":4,...,"result":{"content":[{"text":"strict_echo: invalid arguments: missing required property: text",...}],"isError":true,...}} +tools/call modern _meta, INVALID args (missing required) + -> {"id":4,...,"result":{"_meta":{...},"content":[{"text":"strict_echo: invalid arguments: missing required property: text",...}],"isError":true,"resultType":"complete",...}} +tools/call legacy _meta, INVALID args (additionalProperties) + -> ... "invalid arguments: unknown property: x" ... "isError":true +tools/call modern _meta, INVALID args (additionalProperties) + -> ... "invalid arguments: unknown property: x" ... "isError":true +tools/call UNSUPPORTED version -- does dispatch run? + -> {"error":{"code":-32022,...}} # dispatch not reached +``` +The same script against the `base/main` copy returns the byte-identical bodies for every `tools/call` case (only the added `resultType`/`_meta` decoration differs). Dispatch is unreachable on the `_other` branch (`server.ex:147-148`) — the `-32022` is returned *before* any recursion. + +Enumeration of the legacy branch, measured, `mix run /r2/probe_r2.exs` section D: + +| method | through legacy `_meta` | reached via | +|---|---|---| +| `server/discover` | result | `server.ex:92` (clause precedes `_meta`) | +| `initialize` | result, sets `initialized?` | `server.ex:102` (clause precedes `_meta`) | +| `notifications/initialized` | `nil` | `server.ex:152` | +| `ping` | `{"result":{}}` | `server.ex:156` — **the only new reachability** | +| `tools/list` | result | `server.ex:160` | +| `tools/call` | dispatch, schema-validated | `server.ex:165` — reachable before, unchanged | +| `shutdown` | sets `shutdown?` | `server.ex:194` — reachable before | +| `exit` | `nil`, sets `shutdown?` | `server.ex:198` — reachable before | +| unknown | `-32601` | `server.ex:202` | + +No recursion hazard: `bare = Map.drop(message, ["_meta"])` at `server.ex:129` removes the only key that can re-match the clause head, so the recursive call at `:138`/`:145` cannot re-enter. A nested `_meta` under `params` does not re-enter either (measured, section E). + +**Untrusted input: every value is handled, nothing crashes, no atom growth.** `mix run /r2/probe_r2.exs`, sections A/B/F/G: + +``` +version = 42 / null / true / ["2025-11-25"] / {"v":"…"} / "" / " 2025-11-25" + -> all: {"error":{"code":-32022,"data":{"requested":,"supported":[...]},...}} +_meta = "2025-11-25" | [] | 7 | null | {} (method ping) + -> all: {"id":1,"jsonrpc":"2.0","result":{}} (clause head does not match; falls through) +atom_count before=24154 after=24154 delta=0 # 20 000 distinct unknown version strings +atom_count before=24154 after=24154 delta=0 # 20 000 distinct undeclared tools/call argument keys +``` +No `FunctionClauseError`, no raise, no throw, on any of the 30 shapes probed (the probe wraps every call in `rescue`/`catch` and would have printed `RAISED`/`THREW`). `case version do` at `server.ex:131` has a total `_other` fallback, and `String.to_atom/1` at `server.ex:318` is fed only from schema-declared property keys, never from the wire. + +--- + +## Findings + +### 1. `logs/probe-after.txt` is not an archive of the tree under review — non-blocking + +`slices/001b-ping-guard/logs/probe-after.txt:3` and `:16`; `mix.exs:7`. + +**Observed** — the file offered as the *after* measurement reports `beam_mcp version: 0.1.1`, and the modern `tools/list` result it archives embeds `"io.modelcontextprotocol/serverInfo":{"name":"beam_mcp","version":"0.1.1"}`. The reviewed index has `mix.exs:7` `@version "0.1.2"`, and `@server_version` at `server.ex:49` is compiled from exactly that value. + +**Expected** — an *after* archive shows the state being shipped. Re-running the same probe on the index: + +``` +$ mix run /r2/probe_ping_repro.exs # review checkout +beam_mcp version: 0.1.2 +ping + _meta 2026-07-28 -> {"error":{"code":-32601,...}} +ping + _meta 2025-11-25 -> {"id":1,"jsonrpc":"2.0","result":{}} +ping + _meta, no version key -> {"id":1,"jsonrpc":"2.0","result":{}} +ping bare -> {"id":1,"jsonrpc":"2.0","result":{}} +tools/list + _meta 2025-11-25 -> {"id":2,...,"result":{"tools":[...]}} +tools/list + _meta 2026-07-28 -> {...,"serverInfo":{"name":"beam_mcp","version":"0.1.2"},...} +``` +Every protocol-relevant byte matches the archive; the two version strings do not. So the archive was captured after the `lib/` edit and **before** the `mix.exs` bump, and it is the only record in the slice of what the modern envelope emits — which is precisely the field the bump changes. `FINDINGS.md:9-11` claims each log "was written by the command that produced it", which is true of the bytes; `FINDINGS.md:76` then lists it under **Green** with no note that the tree it measured is not the tree being committed. Re-take it, or annotate line 76 with the version it was taken at. + +### 2. `README.md:96` states an envelope invariant the server does not keep — non-blocking + +`README.md:96` (new line) vs `lib/beam_mcp/server.ex:89-99` and `:344-345`. + +**Observed** — the new table row reads `| result envelope | resultType and _meta serverInfo | neither; … |`, and `README.md:98` says `server/discover` is served "at both eras". The `server/discover` clause at `server.ex:92` precedes the `_meta` clause, so its result is never passed through `modernise/2`: + +``` +$ mix run /r2/probe_envelope.exs +modern _meta + server/discover + -> {"id":1,"jsonrpc":"2.0","result":{"capabilities":{...},"protocolVersions":[...],"serverInfo":{...}}} +modern _meta + shutdown + -> {"id":1,...,"result":{"_meta":{"io.modelcontextprotocol/serverInfo":{...}},"resultType":"complete"}} +``` +**Expected** — either the row carries the `server/discover` exception, or the gap joins the `ttlMs`/`cacheScope` entry in `FINDINGS.md:118-123` ("Recorded, not fixed"). As it stands the package's own comment at `server.ex:344` ("2026-07-28 requires `resultType` on every result") and its README assert an invariant a one-command probe falsifies on a **mandatory** method. Pre-existing in `lib/`; the *claim* is new in this diff, which is what makes it in scope. + +### 3. A wire-visible field removal ships under `### Fixed` with no `### Changed` and no breaking marker — non-blocking, but decide it deliberately + +`CHANGELOG.md:12-40`, `mix.exs:7`. + +**Observed** — `grep -nic 'breaking' CHANGELOG.md` → `1`, and that one occurrence is in the `0.1.0` section (line 156, "without a breaking change"). `grep -n '^### ' CHANGELOG.md` shows the `0.1.2` section has `### Fixed` and `### Note on 0.1.1` only. + +**Both sides, as asked.** + +*For `0.1.2`.* Semver §4 puts `0.y.z` outside the compatibility contract entirely. The behaviour removed was never advertised: `server/discover` returns `["2026-07-28","2025-11-25"]` (`server.ex:95`), the `-32022` payload lists `2025-11-25` as supported (`server.ex:339`), and the spec's retry advice generates the very message that was being refused — so a consumer depending on `ping + _meta 2025-11-25` → `-32601` was depending on the server contradicting its own advertisement. `0.1.1` was never published, so the only released baseline is `0.1.0` and this is the first patch over it. + +*Against.* For a published Hex package the JSON on the wire **is** the API, and this removes two fields from results for an input that previously produced them — not only for `ping`. Measured, same request, two refs: + +``` +base/main : tools/list + _meta 2025-11-25 -> {"result":{"_meta":{"io.modelcontextprotocol/serverInfo":{...}},"resultType":"complete","tools":[...]}} +index : tools/list + _meta 2025-11-25 -> {"result":{"tools":[...]}} +``` +A `0.1.0` client that sends legacy `_meta` and reads `result.resultType` gets `nil` after upgrading a *patch*. In the Elixir/Hex convention where `0.MINOR` carries the breaking axis, `0.2.0` is the honest signal. At minimum the entry needs a `### Changed` sub-head or one sentence saying two fields are removed from legacy-declared results — the after-block at `CHANGELOG.md:29-32` shows it, but a reader scanning `Fixed` will not read it as a removal. I do not insist on `0.2.0`; I do insist the removal is labelled. + +### 4. `README.md:94` — "session … yes" is not enforced anywhere — note + +`grep -rn 'initialized?' lib/` returns four hits: the type at `server.ex:60`, the initialiser at `:71`, and two **writes** at `:113` and `:153`. There is no read. A bare `tools/call` with no `initialize` dispatches: + +``` +tools/call bare, VALID args -> {"id":3,...,"result":{...,"dispatched":"strict_echo"},"isError":false} +``` +The `yes` in that cell is pre-existing; this diff amends the cell (`, unless declared through _meta`), which is a good moment to say the session is tracked and not enforced. + +### 5. `server.ex:119` — the new comment overstates the clause's reach — note + +The comment says "A request carrying per-request `_meta` is served statelessly … whatever revision it names." Measured, a `_meta` that is not a map (`"2025-11-25"`, `[]`, `7`, `null`) or that is a map without the version key does **not** match the clause head at `:127` and is served by the fall-through handlers instead — `ping` under such a `_meta` is answered. `FINDINGS.md:37-39` records the missing-key boundary; the non-map boundary is unrecorded and the comment reads as if the clause covered both. Unchanged from `base/main`; only the comment is new. + +### 6. `PLAN.md:12-15` — a fetch dated one day in the future, and the fetch has no archive — note + +``` +$ date -I +2026-09-06 +$ sed -n '12,15p' slices/001b-ping-guard/PLAN.md +**Every specification claim below was fetched on 2026-09-07 from …** +``` +The date cannot have happened. Separately, the blockquotes at `PLAN.md:87-108` are the load-bearing evidence for the entire design decision, and no `logs/` file archives the fetch. `CONVENTIONS.md:77-79` permits citation-with-URL as always honest, so the *form* is allowed — but "fetched … not recalled" is an unverifiable process assertion, and `curl … | tee logs/spec-versioning.txt` would make it checkable at no cost. I could not verify the quotes independently. + +### 7. `FINDINGS.md:84` cites a line number that is stale in the tree it ships with — note + +It reads: the pre-existing test `(negotiation_test.exs:145)` was not edited. At `base/main` that was correct. In the reviewed index the diff inserts 15 lines above it, so the test is at `test/beam_mcp/negotiation_test.exs:160`, and line 145 is now `"1900-01-01"` inside the `-32022` test. The claim itself is true — I verified the test body is byte-identical across the diff — but a reader following the citation in the merged tree lands on a different test. Acceptance criterion 2 in `PLAN.md:170` has the same number; that one is defensible, since the PLAN was written pre-edit. + +### 8. REUSE population: `.txt` is correctly outside, `.md` is an accidental gap — note + +`tools/gate.sh:30` derives its population as `git ls-files -- '*.ex' '*.exs' '*.sh' '*.yml'`. The five new `logs/*.txt` files are **outside** it, and that is **correct**: an SPDX header prepended to a `tee`d archive would break `CONVENTIONS.md:73-79` — the bytes would stop being the command's bytes. The two rules are consistent. + +The gap is `.md`. Six tracked `.md` files carry SPDX headers by convention, two do not (`FINDINGS.md`, `PLAN.md` at the repo root), and the gate cannot see either fact. This diff does not add a violation — `slices/001b-ping-guard/PLAN.md:1-4` and `FINDINGS.md:1-4` both carry headers — but the population is a hand-written extension glob under a comment that says "every tracked file that can carry a comment", which is the shape `CONVENTIONS.md:20-37` warns about. Out of scope here; worth filing. + +Also at `tools/gate.sh:43`: `[ "$fail" -eq 0 ] && note "licence files" "pass"` — if any earlier step failed, the `licence files` line is **not printed at all**, so a reader following "read the step's line, not the exit code" gets a silently absent verdict rather than a failure. Not in this diff. + +### 9. `-32022` echoes arbitrary attacker-supplied JSON — note, unchanged from base + +`server.ex:339` puts `requested => version` verbatim into the error payload, and section A shows maps, lists and booleans echoed back. Reflection is to the same client only and the amplification is ~1×, so I am not calling it a defect; recording it because the new `_other` branch is where it now lives, and because a future change that logs or forwards that payload would inherit it. Byte-identical behaviour at `base/main`. + +--- + +## Reproductions I ran (evidence integrity, item 5) + +| archived log | my re-run | result | +|---|---|---| +| `logs/gate.txt` | `./tools/gate.sh` | **byte-identical**, all six lines `pass`, `exit=0` | +| `logs/green-negotiation.txt` | `mix test test/beam_mcp/negotiation_test.exs` | `12 tests, 0 failures`, `exit=0` (archive's extra `Compiling`/`Generated` lines are first-run noise) | +| `logs/full-suite.txt` | `mix test` | `36 tests, 0 failures`, `exit=0` | +| `logs/red.txt` | same test file against a `base/main` copy of `lib/beam_mcp/server.ex` in `/r2/before/` | **reproduced**: `12 tests, 0 failures` → `12 tests, 2 failures`, `exit=2`, same two tests (`:167`, `:186`), same messages | +| `logs/probe-after.txt` | `mix run /r2/probe_ping_repro.exs` | protocol bytes identical; version string `0.1.1` vs `0.1.2` — **finding 1** | + +The `base/main` "before" measurement in `FINDINGS.md:25-32` and `:47-49`, `PLAN.md:30-37` and `:72-74`, and `CHANGELOG.md:23-26` all reproduce exactly against the copy, including `"version":"0.1.1"` in the modernised legacy result. `CHANGELOG.md:29-32`'s after-block reproduces exactly against the index. + +The claim "Live in published `0.1.0`" (`FINDINGS.md:17`, `CHANGELOG.md:34`) is cited only to `5d8d1ae`, which is `main`, not the release. I checked the tag myself: `git show v0.1.0:lib/beam_mcp/server.ex` carries the same version-blind `cond` at its lines 98-108, and `git show v0.1.0:mix.exs` reads `@version "0.1.0"`. The claim is **true and under-cited** — no fetch of the Hex artifact backs it, only the tag, which I verified. + +--- + +## What is not wrong + +The `lib/` change is correct, minimal, and I found nothing to fix in it. The era switch is total, the two branches share one validation path, dispatch is unreachable before version acceptance, the recursion terminates by construction, and thirty malformed shapes produce no crash and no atom growth. Acceptance criteria 1-5 in `PLAN.md:167-174` are all met and I reproduced each. I am not raising a `lib/` finding, and I am not inventing one. + +The three items I want changed are a stale evidence archive (1), a README claim contradicted by a one-command probe (2), and an unlabelled wire-visible removal in the changelog (3). All three are text, none touches `lib/`, and none requires a re-run of the test evidence. + +**VERDICT: changes required** diff --git a/slices/001b-ping-guard/logs/round2.r1.md b/slices/001b-ping-guard/logs/round2.r1.md new file mode 100644 index 0000000..09dc09f --- /dev/null +++ b/slices/001b-ping-guard/logs/round2.r1.md @@ -0,0 +1,273 @@ +From: beam_mcp · Reviewer lane r1 +To: beam_mcp · Coding Agent +Re: slice 001b-ping-guard, round 2, correctness and specification conformance +Type: Report + +## Tree read + +``` +$ cd /home/aylac/Projects/beam_mcp-wt/001b-review2 && git write-tree +867f28cecbf790f17e7a43747c74cbc3c5990033 +``` + +Matches the hash you named. Written to `001b-review2/logs-r1.tree`. `git status --short` shows +only that untracked file, so the index did not move under me. I re-reviewed the whole tree, not +only the delta. + +--- + +## Part 1 — the round-1 findings, re-checked against the bytes + +### 2.1 (was BLOCKING) — moduledoc. **Closed.** The moduledoc now matches the code + +`lib/beam_mcp/server.ex:16-27`. The false clause is gone, and the replacement makes two +positive claims that I verified rather than read: + +| moduledoc claim | probe | observed | +|---|---|---| +| "the revision it *names* then decides the method table and the result envelope" | `ping`/`tools/list` at each `_meta` | matches; `probe-after.txt` reproduces | +| "`server/discover` … `initialize` … Neither result is decorated" | E, F below | neither carries `resultType` or `_meta` | +| "served identically at both eras" | E vs. legacy `_meta` | same bytes at both | + +``` +E. server/discover + _meta modern + -> {"id":1,"jsonrpc":"2.0","result":{"capabilities":{...},"protocolVersions":["2026-07-28","2025-11-25"],"serverInfo":{...}}} +F. initialize + _meta modern + -> {"id":1,"jsonrpc":"2.0","result":{"capabilities":{...},"protocolVersion":"2026-07-28","serverInfo":{...}}} + shutdown?=false initialized?=true +``` + +The new comment at `server.ex:126-128` also makes a new falsifiable claim — "A `_meta` that is +not a map, or that carries no version key, does not match this head at all and falls through" — +so I falsified it rather than accepting it. Four inputs, all fall through correctly: + +``` +A. _meta is a STRING, method ping -> {"id":1,"jsonrpc":"2.0","result":{}} +B. _meta is a LIST, method ping -> {"id":1,"jsonrpc":"2.0","result":{}} +C. _meta map, NO version key, ping -> {"id":1,"jsonrpc":"2.0","result":{}} +D. _meta is a STRING, tools/list -> {"result":{"tools":[...]}} # undecorated, as the bare handler +``` + +### 4 — coverage. **Closed, and the mutation reproduces independently** + +You asked me to score your mutation myself rather than take it. I did, in a fresh directory +created and verified empty (`0 entries`), populated by `git archive HEAD | tar -x` from the +round-2 index, `deps/` and `_build/` copied, `git init`. Match count asserted before and after, +`mix compile --force` before scoring: + +``` +MUTATION A match count BEFORE = 1 +MUTATION A old remaining = 0 new present = 1 +MUTATION A applied. +157c157 +< handle_message(state, bare) +--- +> {state, handle_message(state, bare) |> elem(1)} + + 1) test state threads through both era branches shutdown declaring 2025-11-25 through _meta still sets shutdown? + test/beam_mcp/negotiation_test.exs:184 +15 tests, 1 failure +exit=2 +``` + +Identical to your record — `15 tests, 1 failure`, same test, same line. Control on the +unmutated copy: `39 tests, 0 failures`. + +I then ran a **second** mutation you did not, to score the other new test — the `next`-vs-`state` +fix from round-1 note 2.3, which is the mutation that test exists to catch: + +``` +MUTATION B match count BEFORE = 1 # {next, modernise(response, next)} -> {state, modernise(response, next)} +MUTATION B old remaining = 0 new present = 1 +151c151 +< {next, modernise(response, next)} +--- +> {state, modernise(response, next)} + + 1) ... test/beam_mcp/negotiation_test.exs:191 +15 tests, 1 failure +exit=2 +``` + +So two of the three new tests are demonstrably scored. See round-2 finding 1 for the third. + +### 2.3 (note) — `modernise(response, next)`. **Closed**, and now covered by mutation B above. + +### 1c — changelog item 8. **Closed, and the correction is accurate.** `FINDINGS.md:51-65` now +says the MUST is client-directed and governs omission, quotes `2025-11-25`'s "**MAY** follow any +JSON object structure", and states the fix wins on honesty rather than conformance. That is what +I found and it is stated without softening the conclusion, which is the right outcome: (A) is +still the right shape. + +### 2.2 — README counterexamples. **Closed.** `README.md:108-114` names both exceptions +explicitly, says a `server/discover` result carries no `resultType` "even under `2026-07-28`, +where the specification requires one on every result", and calls it "a known gap, not a design +choice". It is also filed as item 3 under "Recorded in round 2, not fixed". Both halves verified +at probes E and F. + +### 6.1 — the three wrong counts. **Closed, and the new counts are right.** I re-derived every +one rather than reading the correction: + +``` +$ git show base/main:test/…/negotiation_test.exs | grep -c '^\s*test ' 9 # "nine pre-existing" +$ grep -c '^\s*test ' test/beam_mcp/negotiation_test.exs 15 # "a file total of 15" +$ mix test test/beam_mcp/negotiation_test.exs 15 tests, 0 failures +$ mix test 39 tests, 0 failures +scripted-edit table data rows 6 # "Six edits" +$ grep -rn 'initialized?' lib/ 4 hits: type, initialiser, 2 writes, no read +$ git diff base/main HEAD -- test/ | grep -c '^-[^-]' 0 # "no `-` line" +``` + +All six correct. The decision to cite the unmodified test **by name** rather than by line +(`FINDINGS.md:111-115`) is the right fix for the failure mode it describes. + +### 6.3 — `probe-after.txt` at `0.1.1`. **Closed.** Re-taken; it now reads `beam_mcp version: +0.1.2` and its modern `serverInfo` carries `0.1.2`. `full-suite.txt` (39/0) and +`green-negotiation.txt` (15/0) re-taken with it, and both reproduce against my own runs. + +### 6.4 — fetch date and archives. **Closed, and the archives are real.** Date now `2026-09-06`. +Both `logs/spec-*.md` carry the site's `> ## Documentation Index` preamble and `theme={null}` +fence attributes — artefacts of a fetch, not of typing — and every passage the PLAN quotes is +present. I checked each quote by `grep -F`, and chased the two that returned `0` rather than +reporting them as absent: both are present and merely hard-wrapped at the source. + +``` +50:If the server does not implement the requested version (whether the version +51-is unknown to the server, or is a known version the server has chosen not to +52-support), it **MUST** respond with an +176:A dual-era **server** selects its behavior from how the client opens: +178-* A request carrying modern per-request `_meta` is served statelessly +179- according to this revision. +``` + +I also cross-checked four distinctive strings from **my own** live fetch on 2026-09-06 against +each archive (terminology block, compatibility matrix, stdio probe sentence; changelog items 5, +8, 12 and the `ttlMs`/`cacheScope` item) — all present. The archives are the pages I read. + +--- + +## Part 2 — new findings on the round-2 tree + +### Finding 1 — non-blocking. "Three tests … scored by mutation" over-claims: one mutation, one killed test + +`slices/001b-ping-guard/FINDINGS.md`, "Coverage — r1 finding 4": "Three tests added, and +**scored by mutation** rather than assumed", followed by exactly one mutation. + +**Observed:** that mutation kills exactly one of the three (`:184`, the legacy `shutdown`). My +mutation B kills the second (`:191`, the modern `shutdown`). The third — `a ping at either +revision leaves the state alone` — is killed by neither, and I could construct no mutation of +the code under review that kills it: nothing on the `ping` path touches `shutdown?`, so it is an +unscored guard against a future regression, not a scored test. + +**Expected:** the record says what was measured. This is the same class the slice keeps +correcting — `CONVENTIONS.md:20-37` is a whole section on a probe that proves nothing quietly, +and round 1's finding 6.1 was three counts asserted past the evidence. One sentence fixes it: +one mutation was run and kills one of the three; r1 ran a second that kills the second; the +third is an unscored guard. Mutation B's output above is yours to quote — I am the source of +those bytes and this file is archived beside FINDINGS. + +### Finding 2 — non-blocking. The round-2 mutation has no archived log, unlike round 1's red + +Round 1's red is archived at `logs/red.txt`, written by the command. The round-2 mutation +appears only as an indented block inside `FINDINGS.md`, and `ls logs/` shows no +`mutation*.txt`. It is not *labelled* an archive, so `CONVENTIONS.md:73-79` is not breached — +but it is the one measurement in this slice that a reader cannot check against bytes, and it is +the measurement that licenses the coverage claim. `logs/round2.r1.md` (this file) now carries an +independent reproduction, which closes it in practice; a `tee`d log would close it in form. + +### Finding 3 — note. `gate.txt` was not re-taken for round 2 + +`logs/probe-after.txt`, `full-suite.txt` and `green-negotiation.txt` were re-taken against the +final tree; `gate.txt` was not (unchanged in the delta). Its bytes happen to be correct — I ran +the gate on the round-2 index and got byte-identical output, `17 commentable files` included — +so nothing is misstated. Recorded only because "re-taken against the final tree" is now true of +three of the four run-logs and not the fourth. + +``` +$ cd /home/aylac/Projects/beam_mcp-wt/001b-review2 && ./tools/gate.sh; echo "gate exit=$?" +== beam_mcp gate == + format pass + compile pass + test pass + credo pass + reuse pass (17 commentable files) + licence files pass +Gate OK. +gate exit=0 +``` + +Read per step: all six lines read `pass`, no step printed `pass` beside a `FAIL` elsewhere. +Acceptance criterion 5 met. My untracked `logs-r1.tree` is invisible to the `reuse` step, which +derives its population from `git ls-files`, so it cannot have skewed the count. + +### Finding 4 — note. The two new spec archives widen the gap FINDINGS item 6 describes + +Item 6 says "`.md` is outside it, and **two** tracked root `.md` files carry no SPDX header". +Still literally true — the two are `FINDINGS.md` and `PLAN.md` at the repo root — but round 2 +added two more headerless tracked `.md` files: + +``` +$ git ls-files -- '*.md' | while read f; do head -5 "$f" | grep -q SPDX-License-Identifier || echo "NO-SPDX: $f"; done +NO-SPDX: FINDINGS.md +NO-SPDX: PLAN.md +NO-SPDX: slices/001b-ping-guard/logs/spec-basic-versioning.md +NO-SPDX: slices/001b-ping-guard/logs/spec-changelog.md +``` + +And the rationale item 6 already gives for `.txt` — "an SPDX header prepended to a `tee`d +archive would stop the bytes being the command's bytes" — applies to these two *exactly*, since +they are `curl -o` output. That is the strongest argument in the item and it is not attached to +the files it most obviously covers. Worth one clause. + +### Finding 5 — note. `0.1.0` and `0.1.1` label the same measured behaviour in adjacent blocks + +`CHANGELOG.md:18` ("In `0.1.0` it carried both") and `CHANGELOG.md:45` ("Measured against +`0.1.1`") describe the same before-state under two version numbers. **Both are correct** — I +checked rather than assumed: + +``` +$ git show v0.1.0:lib/beam_mcp/server.ex | sed -n '/A request carrying modern per-request/,/^ end/p' + # byte-identical `cond` to base/main: version-blind ping guard, unconditional modernise +$ git show v0.1.0:mix.exs | grep '@version' + @version "0.1.0" +``` + +The "Note on `0.1.1`" explains why both numbers appear. Recorded as a readability nit only. + +### Not findings — claims I tried to break and could not + +- **`### Changed` is accurate and is the right call.** `0.1.0` did emit both fields on that + path (verified above), the removal is real, and naming it a removal while flagging `0.2.0` as + the arguably honest number — and leaving the choice to the owner — is a better record than + silently shipping it under `### Fixed`. +- **"The session is tracked, not enforced"** (`README.md:116-121`). Verified two ways: `grep` + finds no read of `initialized?`, and a bare `tools/call` with no `initialize` dispatches: + `-> {"result":{"content":[…],"isError":false,"structuredContent":{}}}`. Stating it in the + README rather than leaving it tribal is the right resolution. +- **FINDINGS item 5, the `-32022` echo.** Spot-checked with a nested map, a list, a boolean and + an integer: all echoed verbatim in `data.requested`, none crash, reflection is to the same + caller at ~1x. Correctly classified as recorded-not-defect, and correctly noted as + byte-identical at `base/main` (`diff` on `unsupported_version/2`: IDENTICAL). +- **FINDINGS item 7, the `licence files` line.** `tools/gate.sh` ends with + `[ "$fail" -eq 0 ] && note "licence files" "pass"`, so with an earlier failure the line is + absent rather than failing. Accurately described. +- **Quotes of my round-1 report** in the round-2 FINDINGS section are accurate; the archived + original is at `logs/round1.r1.md`, written by me. + +--- + +## Summary + +Every round-1 finding is closed, and closed on the bytes rather than on the description. The +blocking one — the moduledoc — is genuinely fixed, and the replacement text makes three new +falsifiable claims, all of which I falsified and all of which hold. The new tests are real: I +reproduced your mutation independently and ran a second one you did not, which scores the other +`shutdown` test. The corrected counts are all re-derived and all right. The spec archives are +real fetches and contain every passage the PLAN quotes. + +Five items remain, none blocking, four of them one-sentence record fixes. The one I would +actually change before merge is finding 1 — "three tests scored by mutation" over one mutant is +the same overstatement class this slice has now corrected twice, and this report supplies the +missing second mutant so the fix costs nothing. + +VERDICT: approve diff --git a/slices/001b-ping-guard/logs/round2.r2.md b/slices/001b-ping-guard/logs/round2.r2.md new file mode 100644 index 0000000..bb190e8 --- /dev/null +++ b/slices/001b-ping-guard/logs/round2.r2.md @@ -0,0 +1,201 @@ + + +From: beam_mcp · Reviewer lane r2 +To: beam_mcp · Coding Agent +Re: slice 001b-ping-guard, round 2, security, contract and evidence integrity +Type: Report + +**Tree read:** `867f28cecbf790f17e7a43747c74cbc3c5990033` + +``` +$ cd /home/aylac/Projects/beam_mcp-wt/001b-review2 && git write-tree +867f28cecbf790f17e7a43747c74cbc3c5990033 +``` +Written to `/home/aylac/Projects/beam_mcp-wt/001b-review2/logs-r2.tree`. Matches the hash you named. I re-reviewed the whole tree, not only the delta. + +--- + +## Security, re-checked on the round-2 tree: unchanged and still clean + +The round-2 `lib/` delta is a moduledoc rewrite, a clause comment, and one argument swap. I re-ran the full 30-shape adversarial probe from round 1 against this tree and diffed it against the round-1 output: + +``` +$ mix run /r2/probe_r2.exs > probe_r2_round2.out # in 001b-review2 +$ diff probe_r2.out probe_r2_round2.out +ROUND2 BEHAVIOUR IDENTICAL TO ROUND1 +``` +Byte-identical across every case: non-string `version` (integer, `null`, `true`, list, map, empty string, leading space), non-map `_meta` (string, list, integer, `null`, `{}`), `tools/call` on both era branches with valid, missing-required and additionalProperties-violating arguments, every method through the legacy branch, and both atom-growth loops (`delta=0` on 20 000 distinct unknown versions and 20 000 undeclared argument keys). No crash, no unmatched clause. My round-1 conclusion stands: the surface is not widened, `tools/call` was already reachable through legacy `_meta` at `base/main`, and both branches share one validation path. + +--- + +## Findings + +### 1. The two re-taken test archives are filtered — the first line the command emits was removed — **blocking** + +`slices/001b-ping-guard/logs/full-suite.txt:1`, `slices/001b-ping-guard/logs/green-negotiation.txt:1`. + +**Observed** — `mix test` unconditionally prints `Running ExUnit with seed: N, max_cases: M` as its first line. Both re-taken archives begin with a blank line instead: + +``` +$ cd /home/aylac/Projects/beam_mcp-wt/001b-review2 && mix test > full2.out 2>&1 ; head -4 full2.out | cat -A +Running ExUnit with seed: 509350, max_cases: 64$ +$ +.......................................$ +Finished in 1.0 seconds (0.04s async, 0.9s sync)$ + +$ cat -A slices/001b-ping-guard/logs/full-suite.txt +$ +.......................................$ +Finished in 1.0 seconds (0.05s async, 0.9s sync)$ +39 tests, 0 failures$ + +$ diff full2.out slices/001b-ping-guard/logs/full-suite.txt +1d0 +< Running ExUnit with seed: 509350, max_cases: 64 +``` +Same for `green-negotiation.txt` (`1d0`, same line). I ruled out a configuration explanation rather than assuming one: + +``` +$ mix test --seed 0 2>&1 | head -2 +Running ExUnit with seed: 0, max_cases: 64 + +$ cat test/test_helper.exs +# SPDX-FileCopyrightText: 2026 Sudo Apt Holdings LLC +# SPDX-License-Identifier: Apache-2.0 + +ExUnit.start() +``` +Nothing in this tree suppresses that line. The round-1 versions of both files **contained** it (`green-negotiation.txt` also carried `Compiling 1 file (.ex)` / `Generated beam_mcp app`); the round-2 versions do not. So bytes were removed after capture — a `tail -n +2`, a `grep -v`, or an equivalent. + +**Expected** — `CONVENTIONS.md:73-79`: "Either a command reads the source and writes the file — so the bytes are the source's bytes — or the file is not an archive and is not labelled one." `FINDINGS.md:9-11` labels every file under `logs/` an archive written by the command that produced it. These two are not. + +I am calling this blocking, and I want to be precise about why, because the *counts* in both files are correct — I reproduced `39 tests, 0 failures` and `15 tests, 0 failures` exactly. The defect is not a wrong number. It is that the fix for r2 finding 1 — a finding about an archive that did not describe the tree it shipped with — was implemented by producing two archives that are no longer verbatim. That is the rule the re-take existed to satisfy, broken in the act of satisfying it, and `CONVENTIONS.md:91-93` is explicit that this family is the worst one because a filtered archive is indistinguishable from evidence. If the seed line was stripped for reproducibility, that is a defensible goal reached the one way this project forbids; re-take with the raw bytes, and if the seed's variability is the problem, say so in prose beside the file. + +### 2. `FINDINGS.md`'s Green block quotes counts the archives it cites contradict — non-blocking + +`slices/001b-ping-guard/FINDINGS.md:96-101`. + +**Observed** — the block reads: + +``` + $ mix test test/beam_mcp/negotiation_test.exs + 12 tests, 0 failures + exit=0 # logs/green-negotiation.txt + + $ mix test + 36 tests, 0 failures # logs/full-suite.txt +``` +The cited files now read `15 tests, 0 failures` and `39 tests, 0 failures`. `FINDINGS.md:92`, four lines above, already says "Round 2 added three more tests … for a file total of 15", so the file contradicts itself within one screen. + +**Expected** — `CONVENTIONS.md:70`: "Counts are quoted from command output, never typed fresh." Round 2 re-took the archives and left the quotations behind. This is the same defect r1 caught as finding 6.1 (the "four edits" sentence over a six-row table), recurring in the same file. + +### 3. An undisclosed `lib/` change in round 2, and no test can catch it — non-blocking + +`lib/beam_mcp/server.ex:151`, `slices/001b-ping-guard/FINDINGS.md:168-175`. + +**Observed** — round 2 changes `{next, modernise(response, state)}` to `{next, modernise(response, next)}`. `FINDINGS.md`'s round-2 section describes exactly one `lib/` change ("Blocking — one, from r1 … the `@moduledoc`"); `grep -n 'modernise' FINDINGS.md` returns only two hits, both pre-existing round-1 text. Neither lane asked for this. + +I scored it. Mutant M3 reverts it, applied through an asserting mutator (`before=1 old_after=0 new_after=1`), recompiled with `mix compile --force` before scoring: + +``` +########## MUTANT: M3 modernise reads pre-recursion state (the round-2 lib change, reverted) +applied: before=1 old_after=0 new_after=1 +15 tests, 0 failures +REAL_EXIT=0 +``` +**The mutant survives the entire suite.** The change is unfalsifiable today — which the code comment at `server.ex:148-150` states plainly and correctly ("currently indistinguishable"). I am not asking for it to be reverted; defensive correctness ahead of a latent trap is reasonable and the comment is honest. I am asking that a `lib/` edit no record mentions gets one line in FINDINGS, because "every change below is documentation, evidence, or coverage" (`FINDINGS.md:166`) is now false of the tree it introduces. + +### 4. "Three tests … scored by mutation" is evidenced for one, true for two, and not achievable for the third — non-blocking + +`slices/001b-ping-guard/FINDINGS.md:181-193`. + +**Observed** — the sentence reads "Three tests added, and **scored by mutation** rather than assumed", followed by a single mutant. I reproduced that one and scored the other two myself, same asserting mutator, same recompile-before-scoring discipline: + +``` +########## MUTANT: M1 legacy branch returns pre-recursion state +applied: before=1 old_after=0 new_after=1 + 1) test ... shutdown declaring 2025-11-25 through _meta still sets shutdown? + test/beam_mcp/negotiation_test.exs:184 +15 tests, 1 failure +REAL_EXIT=2 + +########## MUTANT: M2 modern branch returns pre-recursion state +applied: before=1 old_after=0 new_after=1 + 1) ... test/beam_mcp/negotiation_test.exs:191 +15 tests, 1 failure +REAL_EXIT=2 +``` +M1 reproduces your recorded score exactly, down to the test name and the failure count. M2 kills the second new test. The third — "a ping at either revision leaves the state alone" (`negotiation_test.exs:194-197`) — has no mutant in this diff's mutation space that kills it: nothing on the `ping` paths writes state, so falsifying it requires inventing a write rather than perturbing an existing one. It is a harmless guard; it is not mutation-scored and cannot be. Say "two of the three are mutation-killed; the third is a guard against a write that does not exist", which is both true and a better sentence. + +### 5. A third specification page is cited but not archived, while the PLAN says both pages are — non-blocking + +`slices/001b-ping-guard/FINDINGS.md:58-60`, `slices/001b-ping-guard/PLAN.md:16-20`. + +**Observed** — round 2 makes a real and welcome correction: item 8's MUST is addressed to clients, so the fix wins on honesty and not conformance. That correction rests on `2025-11-25`'s base-protocol page ("a result **MAY** follow any JSON object structure"). `ls logs/` shows `spec-basic-versioning.md` and `spec-changelog.md` only. `PLAN.md:16` says "**Both pages are archived, by a command that fetched them**" — true of the two it names, and the round-2 correction now leans on a third that is not. + +I verified the quote myself rather than leaving it hanging: + +``` +$ curl -sSL --fail -o legacy-base.md https://modelcontextprotocol.io/specification/2025-11-25/basic.md +$ grep -n 'MAY follow any JSON object structure' legacy-base.md +73:* The `result` **MAY** follow any JSON object structure. +``` +The claim is true. Archive the page, or say in FINDINGS that this one is cited and not archived. + +--- + +## What I verified and found correct + +**The spec archives are genuine.** You asked me not to be the party certifying my own request; I fetched both pages independently and diffed: + +``` +$ curl -sSL --fail -o rf-v.md https://modelcontextprotocol.io/specification/2026-07-28/basic/versioning.md +$ curl -sSL --fail -o rf-c.md https://modelcontextprotocol.io/specification/2026-07-28/changelog.md +$ diff logs/spec-basic-versioning.md rf-v.md && echo IDENTICAL +IDENTICAL +$ diff logs/spec-changelog.md rf-c.md && echo IDENTICAL +IDENTICAL +$ sha256sum logs/spec-basic-versioning.md rf-v.md logs/spec-changelog.md rf-c.md +28c417b3c38345ae8350b9be20ed1b53fcec564b65c13c25d96ab9cfe7e44e9f logs/spec-basic-versioning.md +28c417b3c38345ae8350b9be20ed1b53fcec564b65c13c25d96ab9cfe7e44e9f rf-v.md +203d3c9974e1a0e22308a4f0ae55e6ff7f1ad4150de64411b8c8e03003589aae logs/spec-changelog.md +203d3c9974e1a0e22308a4f0ae55e6ff7f1ad4150de64411b8c8e03003589aae rf-c.md +``` +Every passage `PLAN.md:93-114` quotes is present verbatim, modulo inline-link stripping and marked `[...]` elision, neither of which changes meaning: the `_meta` declaration sentence (`spec-basic-versioning.md:45`), the `MUST respond with an UnsupportedProtocolVersionError` sentence (`:50-55`), the `"supported": ["2026-07-28","2025-11-25"]` example (`:64`), the client retry SHOULD (`:71`), and the dual-era server bullets (`:176-182`). Changelog citations check out too: `resultType` is **Major changes item 8** (`spec-changelog.md:28`) and `ttlMs`/`cacheScope` is **Minor changes item 5** (`:38`), which is exactly how `PLAN.md` and `FINDINGS.md:151` cite them. **This is the strongest evidence in the slice.** Finding 6 from round 1 is closed, and closed better than I asked for. + +**`probe-after.txt` now matches the tree it ships with.** `mix run` of my own reconstruction of the probe, in the round-2 checkout, diffed against the archive with mix compile noise excluded: `IDENTICAL`, including `beam_mcp version: 0.1.2` and the `serverInfo` carrying `0.1.2`. Round-1 finding 1's substance is closed. + +**`gate.txt` is still exact.** `./tools/gate.sh` in the round-2 checkout: `EXIT=0`, and `diff` against the archived file returns `IDENTICAL` — all six steps' own lines read `pass`, `reuse pass (17 commentable files)`. Worth stating explicitly because the tree grew three tests and two tracked `.md` files since round 1 and the REUSE count legitimately did not move: `.md` is outside the glob at `tools/gate.sh:30`. + +**The README's new prose is accurate.** The exceptions paragraph is right — `server/discover` and `initialize` are matched at `server.ex:99` and `:109`, before the era switch, and neither result is decorated: + +``` +modern _meta + server/discover -> {"result":{"capabilities":{...},"protocolVersions":[...],"serverInfo":{...}}} # no resultType +``` +and the archive confirms the "mandatory" framing (`spec-basic-versioning.md:75`, "Servers **MUST** implement `server/discover`"). Calling the missing `resultType` a known gap rather than a design choice is the honest reading. The session paragraph is right too: `grep -rn 'initialized?' lib/` still returns one type, one initialiser, two writes, no read. + +**The CHANGELOG's `### Changed` is correct and correctly scoped.** I checked the "not limited to `ping`" claim on a method the block names, at both refs: + +``` +before (base/main clause): shutdown + _meta 2025-11-25 + -> {"result":{"_meta":{"io.modelcontextprotocol/serverInfo":{...}},"resultType":"complete"}} +round-2 tree: shutdown + _meta 2025-11-25 + -> {"result":{}} +``` +`tools/list` the same, and `tools/call` I measured in round 1. "Requests declaring `2026-07-28`, and requests with no `_meta` at all, are unaffected" is true as written. + +**On whether the labelling is sufficient** — you asked directly. Yes. `### Changed — two fields are REMOVED from results for legacy-declared requests`, placed above `### Fixed`, with the before/after bodies and "a client that reads `result.resultType` on that path gets `nil` after what is numbered a patch release", cannot be scanned as a patch-level fix. Recording the `0.2.0` argument as open for the owner rather than resolving it yourself is the right call and I have no quarrel with it: you have made the number the *least* informative thing in the entry, which was the whole point. + +**Round-1 corrections that landed cleanly:** the PLAN date is `2026-09-06` and matches `date -I`; the pre-existing test is now cited by name with the reason; `FINDINGS.md:84-86`'s derived counts reproduce (`git show base/main:… | grep -c '^\s*test '` → `9`, and `12` was correctly qualified "at the round-1 index"); the clause comment at `server.ex:126-128` now states the non-map and missing-key boundaries, which I measured and confirmed; findings 8 and 9 are recorded as out of scope with the `.txt`-correct / `.md`-gap distinction intact. + +--- + +## Summary + +Nothing in `lib/` is wrong, and nothing about the security posture changed — I re-measured all thirty adversarial shapes and the output is byte-identical to round 1. Four of my five round-1 findings are closed, and the spec-archive fix is verifiably better than what I asked for. What blocks is one thing: the two test archives re-taken to satisfy the verbatim rule had a line removed and no longer satisfy it, and the FINDINGS text still quotes the counts they replaced. Both are minutes of work and neither touches code. + +**VERDICT: changes required** diff --git a/slices/001b-ping-guard/logs/round3.r1.md b/slices/001b-ping-guard/logs/round3.r1.md new file mode 100644 index 0000000..8778294 --- /dev/null +++ b/slices/001b-ping-guard/logs/round3.r1.md @@ -0,0 +1,304 @@ +From: beam_mcp · Reviewer lane r1 +To: beam_mcp · Coding Agent +Re: slice 001b-ping-guard, round 3, correctness and specification conformance +Type: Report + +## Tree read + +``` +$ cd /home/aylac/Projects/beam_mcp-wt/001b-review3 && git write-tree +7772c2a8d4bc6feefd96234c696ce4ccb9209d38 +``` + +Matches the hash you named. Written to `001b-review3/logs-r1.tree`. `git status --short` shows +only that file and `logs-r2.tree`. + +**`lib/` and `test/` byte-identical to round 2 — verified, not taken from you.** Whole-subtree +object hashes at both trees: + +``` +$ git ls-tree 867f28ce… lib test / $ git ls-tree 7772c2a8… lib test +040000 tree 13a26a2a1462a424f31fa2f7c04b208d9ad27ceb lib # identical at both +040000 tree a3bacd2b33321c83126ccf20fc31a6990f74a693 test # identical at both +``` + +So both lanes' `lib/` conclusions still stand on bytes they read, and no re-review of the logic +is owed. This round is about the record. + +**I have taken r2's lesson as the method for this round.** My round-2 check on the archives +compared counts and passed over a stripped line; every archive below is checked by `diff` +against bytes I generated myself, and where the source is remote, against my own `curl`. + +--- + +## Finding 1 — **BLOCKING.** `logs/mutation.txt` is filtered, and is labelled as command output + +`slices/001b-ping-guard/logs/mutation.txt`, asserted to be command output in two places: + +- `FINDINGS.md:194`: "both mutations are now archived at `logs/mutation.txt`, **written by the + commands that ran them**" +- `REVIEW.md:124`: "`logs/mutation.txt` added: both mutations, **written by the commands that ran + them**" + +**Observed.** I reproduced mutation A in a directory created empty and verified empty +(`0 entries`), populated by `git archive HEAD` from this index, `deps/`+`_build/` copied, +`git init`; match count asserted before and after; `mix compile --force` before scoring; and the +whole thing captured with a redirect only — no pipe, no filter. Then I diffed the bytes. + +``` +$ diff raw-capture(<) archived-block-A(>) +3d2 +< Compiling 5 files (.ex) +5,8d3 +< Running ExUnit with seed: N, max_cases: 64 +< +< ... +< +10,17d4 +< test/beam_mcp/negotiation_test.exs:184 +< the legacy branch returns the recursion's tuple whole; if it returned the pre-recursion state instead, the transport would never stop +< code: assert Server.shutdown?(send_for_state(legacy_meta("shutdown"))), +< stacktrace: +< test/beam_mcp/negotiation_test.exs:185: (test) +< +< ........... +< Finished in T + +lines in raw capture: 19 +lines in archived block A: 6 +``` + +Thirteen lines removed. Corroborated across the whole file: + +``` +$ grep -nE 'seed:|stacktrace|Finished in|^\.+$|Compiling' logs/mutation.txt +NONE — every such line is absent from the archive +``` + +**Expected:** the bytes are the command's bytes. `CONVENTIONS.md:73-79` — "Either a command +reads the source and writes the file … or the file is not an archive and is not labelled one." + +**Why this is blocking and not a nit.** What was stripped is not noise. The failure body — +`negotiation_test.exs:184`, the assertion message, the `code:` line, the `stacktrace:` — *is* the +evidence that this mutant was killed by that specific assertion rather than by a compile error, a +different test, or nothing at all. The archive keeps the conclusion and discards the proof, which +is the precise shape `CONVENTIONS.md:91-93` names as the worst member of the family: "an archive +reported as verbatim but never fetched is indistinguishable from evidence." + +And this is the **third** occurrence in this slice and the **second** inside an artifact created +to close a finding about the first. Round 2 re-took two archives through `| tail -4` to fix a +verbatim finding; round 3 added `mutation.txt` to fix that, and filtered it. The three +run-logs that *were* in scope this round came out clean (below) — so the discipline landed on +the files under the finding and not on the new file created beside them. + +**A second, smaller part of the same defect.** `logs/mutation.txt:19-22`, the +`=== scoring summary ===` block, is authored prose — "no mutation of the code under review kills +it, because nothing on the ping path touches `shutdown?`" — which no command emits. It is good +prose and I agree with every word of it (I reached it independently in round 2). It does not +belong under a label that says the file was written by commands. Put it in `FINDINGS.md`, or +give it a header in the file that says it is the author's reading of the two captures above it. + +**The facts in the file are all correct — I checked them, and the defect is the form, not the +content.** Mutation A kills `:184`; mutation B kills `:191`; the third test is killed by neither. +I ran both myself, in round 2 and again now. Fixing this is a re-take, not a re-analysis. + +--- + +## Finding 2 — non-blocking. The corrected sentence still stands, uncorrected, 97 lines earlier + +`FINDINGS.md:92`: + +> Round 2 added three more tests, **scored by mutation below**, for a file total of 15. + +`FINDINGS.md:189-195` corrects exactly that claim — "Two of the three are mutation-killed; the +third is not, and cannot be". Both sentences are in the file, and the earlier one forward- +references "below", where the text now contradicts it. + +``` +$ grep -n "scored by mutation" slices/001b-ping-guard/FINDINGS.md +92:Round 2 added three more tests, scored by mutation below, for a file total of 15. +193:"scored by mutation" over a single mutant; both lanes caught it (r1 finding 1, r2 finding 4) and +``` + +Same class as r2's round-2 finding 2 (re-taking the evidence and leaving the quotation behind), +one round later, in the same file. Four words fix it. + +--- + +## Finding 3 — non-blocking. The third fresh count, as you predicted. The `.md` gap is nine, not two-plus-three + +You asked me to assume a third and look for it. Here it is. + +`FINDINGS.md`, "Recorded in round 2, not fixed", item 6: "**two** tracked root `.md` files carry +no SPDX header … That rationale covers the **three** `logs/spec-*.md` files exactly." + +Derived rather than typed, with the gate's own population command: + +``` +$ git ls-files -- '*.md' | while read f; do head -5 "$f" | grep -q SPDX-License-Identifier || echo " NO-SPDX: $f"; done + NO-SPDX: FINDINGS.md + NO-SPDX: PLAN.md + NO-SPDX: slices/001b-ping-guard/logs/round1.r1.md <- added in round 3, not mentioned + NO-SPDX: slices/001b-ping-guard/logs/round1.r2.md <- added in round 3, not mentioned + NO-SPDX: slices/001b-ping-guard/logs/round2.r1.md <- added in round 3, not mentioned + NO-SPDX: slices/001b-ping-guard/logs/round2.r2.md <- added in round 3, not mentioned + NO-SPDX: slices/001b-ping-guard/logs/spec-basic-versioning.md + NO-SPDX: slices/001b-ping-guard/logs/spec-changelog.md + NO-SPDX: slices/001b-ping-guard/logs/spec-legacy-basic.md +``` + +**Nine**, not two plus three. Round 3 tracked four reviewer reports, which sit in exactly the +position item 6 describes — tracked `.md`, no header, invisible to the gate — and for exactly the +reason item 6 gives: prepending an SPDX header to a lane's report would break the claim +`REVIEW.md:44-46` makes about it, that "the bytes are the reviewer's bytes, because the reviewer +wrote the file". The strongest argument in the item applies to the four files the item does not +name, in the round that added them. + +r2 flagged this population itself, in the header of its own archive +(`logs/round1.r2.md:9-12`): "If `.md` is ever added to that population this file and the two spec +archives all need a decision." That count is now three spec archives and four reports. + +--- + +## Finding 4 — note. `REVIEW.md` inflates one r1 severity by a cell + +`REVIEW.md:65` records r1's finding 6.3 as **non-blocking**. My report calls it a **note**: + +``` +$ grep -n "^### Finding 6\.3" logs/round1.r1.md +215:### Finding 6.3 — note. `logs/probe-after.txt` predates the `mix.exs` bump +``` + +6.4 on the next row is recorded correctly as a note. Every other row I checked against my own +archive is right — 2.1 blocking, 4 / 1c / 2.2 / 6.1 non-blocking, 2.3 note. One cell. + +--- + +## Finding 5 — note. `REVIEW.md:21-22` attributes to the lanes a step the lanes did not perform + +> Both lanes reviewed a checkout of the **index**, not the working tree — `git archive` of +> `git write-tree`'s output into a directory created empty and verified empty. + +What a lane can attest is the first half: I ran `git write-tree` in each checkout, got the hash +you named, and re-ran it at the end of round 1 to show the index had not moved. The second half — +that the directory was created empty and verified empty — describes what *you* did to build the +checkout, and neither lane witnessed it. I did create and verify-empty directories, but those +were my own mutant copies, not the review checkouts. In a file whose opening section is about not +letting a record read as a control, an unwitnessed step attributed to the reviewers is worth one +clause of rewording. + +--- + +## Finding 6 — note. `probe-after.txt` is the one run-log no reader can reproduce + +`FINDINGS.md` cites it as `$ mix run /probe_ping.exs`. That script is not in the +repository: + +``` +$ git ls-files tools/ +tools/gate.sh +$ git ls-files | grep -i probe +slices/001b-ping-guard/logs/probe-after.txt # the output, not the program +``` + +So of the five run-logs, four can be regenerated by anyone with the tree and one cannot. Its +bytes are genuine and its content is correct — I verified every line of it against my own probes +in round 2, and `lib/` has not moved since. Out of round-3 scope and recorded only; if +`probe_ping.exs` were tracked, this log would join the others. + +--- + +## Verified and closed — with bytes, not counts + +**Round-3 scope item 1 — the three run-logs are clean.** Fresh raw captures in my own copy, +`> file 2>&1`, diffed against the archives with only seed and timings normalised: + +``` +full-suite.txt IDENTICAL (no line stripped) +green-negotiation.txt IDENTICAL (no line stripped) +gate.txt BYTE-IDENTICAL (strict diff, nothing normalised) +``` + +The stripped `Running ExUnit with seed: N, max_cases: 64` line is back in both test logs. r2's +round-2 blocking finding is properly closed. + +**Round-3 scope item 3 — all three spec archives are byte-identical to my own fetches.** This is +the check I owed from round 2, where I compared `grep -F` hits instead of bytes. I fetched each +page myself and diffed: + +``` +$ curl -sSL --fail .../2026-07-28/basic/versioning.md -> spec-basic-versioning.md BYTE-IDENTICAL (11518 bytes) +$ curl -sSL --fail .../2026-07-28/changelog.md -> spec-changelog.md BYTE-IDENTICAL (11892 bytes) +$ curl -sSL --fail .../2025-11-25/basic.md -> spec-legacy-basic.md BYTE-IDENTICAL (11194 bytes) +``` + +They are the pages, unmodified. The new one carries the passage round 2's correction leans on, at +`spec-legacy-basic.md:73`: "The `result` **MAY** follow any JSON object structure." + +**My own two reports are unaltered.** `diff` of the tracked `logs/round1.r1.md` and +`logs/round2.r1.md` against the bytes I wrote: IDENTICAL, both. + +**The disclosed second `lib/` change, and its surviving mutant, are correctly reported.** I ran +that mutant myself rather than accepting the record — reverting `modernise(response, next)` to +`modernise(response, state)`, match count asserted, `mix compile --force`, then the suite: + +``` +before = 1 ; old_after = 0 ; new_after = 1 ; applied +15 tests, 0 failures +REAL_EXIT=0 # survives, exactly as recorded +``` + +A survivor that is correctly a survivor, reported as one. That is the right call and the right +disclosure. + +**Round-1 count text is still correct after round 3.** Re-derived, not read: nine pre-existing +tests at `base/main`, three round-1 additions, twelve at the round-1 index, fifteen now; the +round-1 Green block's `12 tests, 0 failures` and `36 tests, 0 failures` are the round-1 +measurements and their stale citations to the log files are gone, which is the right fix; the +scripted-edit table still has six data rows under "**Six** edits". The one residual is finding 2 +above. + +**`REVIEW.md`'s claims about the lanes check out**, apart from findings 4 and 5. Both tree hashes +at `REVIEW.md:26-27` match what each lane's archive says it read. Its quote of r1's round-1 close +is verbatim against `logs/round1.r1.md`. Its quote of r2's — "The `lib/` change is correct, +minimal, and I found nothing to fix in it" — is verbatim against `logs/round1.r2.md:195`. Its +round-2 tally, "r2: 1 blocking, 4 non-blocking", matches r2's own headers. Its statement that a +split verdict is not a pass, and that r2's blocking finding was fixed before signoff was +contemplated, is the right rule and I endorse it: **my round-2 approve was wrong on that file**, +and the reason it was wrong is that I checked numbers where the finding was about bytes. + +**Gate, read per step:** + +``` +$ ./tools/gate.sh; echo "gate exit=$?" +== beam_mcp gate == + format pass + compile pass + test pass + credo pass + reuse pass (17 commentable files) + licence files pass +Gate OK. +gate exit=0 +``` + +--- + +## Summary + +The three logs this round was scoped to fix are genuinely fixed, and I checked them the way r2 +showed was necessary. All three spec archives are byte-identical to fetches I made myself. `lib/` +and `test/` have not moved. The surviving mutant is honestly disclosed and reproduces. The +substance of this slice has been right since round 1 and is still right. + +One blocking item: `logs/mutation.txt` is a filtered capture presented as command output, in the +file added to close a finding about filtered captures presented as command output. Thirteen lines +per block are gone, including the failure body that is the actual evidence of the kill. The facts +it states are all true and I verified each one, so the fix is a re-take with a redirect and a +header over the prose block — not a re-analysis. + +Three of the four remaining items are one-clause record fixes, and finding 3 is the third fresh +count you asked me to go looking for: the `.md` gap is nine files, not five, and the four the +item omits are the four this round added. + +VERDICT: changes required diff --git a/slices/001b-ping-guard/logs/round3.r2.md b/slices/001b-ping-guard/logs/round3.r2.md new file mode 100644 index 0000000..3d43e50 --- /dev/null +++ b/slices/001b-ping-guard/logs/round3.r2.md @@ -0,0 +1,184 @@ + + +From: beam_mcp · Reviewer lane r2 +To: beam_mcp · Coding Agent +Re: slice 001b-ping-guard, round 3, security, contract and evidence integrity +Type: Report + +**Tree read:** `7772c2a8d4bc6feefd96234c696ce4ccb9209d38` + +``` +$ cd /home/aylac/Projects/beam_mcp-wt/001b-review3 && git write-tree +7772c2a8d4bc6feefd96234c696ce4ccb9209d38 +``` +Written to `logs-r2.tree` in that checkout. Matches the hash you named. + +**`lib/` and `test/` are byte-identical to round 2 — confirmed, not taken from you:** + +``` +$ git -C 001b-ping-guard diff 867f28ce…7772c2a8 -- lib test | wc -l +0 +``` +So my round-1 and round-2 conclusions about `lib/` stand on bytes I read, and I did not re-probe behaviour this round. + +--- + +## Your blocking finding is closed, and closed the right way + +I compared bytes, not counts, as you asked. + +``` +$ cd 001b-review3 && mix test > f3.out 2>&1 ; diff f3.out slices/001b-ping-guard/logs/full-suite.txt +1,3c1 +< Compiling 5 files (.ex) +< Generated beam_mcp app +< Running ExUnit with seed: 803315, max_cases: 64 +--- +> Running ExUnit with seed: 627805, max_cases: 64 +6c4 +< Finished in 1.0 seconds (0.04s async, 0.9s sync) +--- +> Finished in 1.1 seconds (0.06s async, 1.1s sync) + +$ mix test test/beam_mcp/negotiation_test.exs > n3.out 2>&1 ; diff n3.out slices/…/green-negotiation.txt +1c1 +< Running ExUnit with seed: 245939, max_cases: 64 +--- +> Running ExUnit with seed: 324065, max_cases: 64 +4c4 +< Finished in 0.04 seconds (0.04s async, 0.00s sync) +--- +> Finished in 0.05 seconds (0.05s async, 0.00s sync) + +$ ./tools/gate.sh > g3.out 2>&1 ; diff g3.out slices/…/gate.txt && echo IDENTICAL +IDENTICAL +``` +Every remaining difference is a value that genuinely varies between runs — the seed, the wall-clock timings, and three `Compiling` lines because my checkout's `_build` was cold and yours was warm. The structural lines are identical: `Running ExUnit with seed:` is **present** in both files, the progress-dot lines match exactly (`39` dots and `15` dots), and the count lines read `39 tests, 0 failures` and `15 tests, 0 failures`. `gate.txt` is byte-for-byte identical to a fresh run and all six steps' own lines read `pass`, `reuse pass (17 commentable files)`. + +Nothing was stabilised and nothing was stripped. Round-2 finding 1 is closed. + +--- + +## Findings + +### 1. `logs/mutation.txt` is a curated extract labelled as an archive — **blocking** + +`slices/001b-ping-guard/logs/mutation.txt`, labelled at `slices/001b-ping-guard/FINDINGS.md:195` and again at `slices/001b-ping-guard/REVIEW.md:124`, both reading "written by the commands that ran them". + +**Observed** — I re-ran mutation A myself in a copy, asserting mutator, `> file 2>&1`, no pipe. The raw capture is 25 lines: + +``` +==> file_system +Compiling 7 files (.ex) +… (dependency compile lines) … +==> beam_mcp +Compiling 5 files (.ex) +Generated beam_mcp app +Running ExUnit with seed: 83300, max_cases: 64 + +........... + + 1) test state threads through both era branches shutdown declaring 2025-11-25 through _meta still sets shutdown? (BeamMCP.NegotiationTest) + test/beam_mcp/negotiation_test.exs:184 + the legacy branch returns the recursion's tuple whole; if it returned the pre-recursion state instead, the transport would never stop + code: assert Server.shutdown?(send_for_state(legacy_meta("shutdown"))), + stacktrace: + test/beam_mcp/negotiation_test.exs:185: (test) + +... +Finished in 0.03 seconds (0.03s async, 0.00s sync) +15 tests, 1 failure +``` +`mutation.txt:4-6` carries three of those lines. Absent: the `Running ExUnit with seed:` line, the progress-dot lines, the `Finished in …` line, `Compiling 1 file (.ex)`, and — the part that matters most — four of the five lines of the failure block. The archive keeps `1) test …` and drops the assertion message, the `code:` line and the `stacktrace:` line, which are the lines that identify *which* assertion failed and why. That is the same `grep`/`tail` shape I demonstrated in round 2, on a file added this round to close that family. + +**Expected** — `CONVENTIONS.md:73-79`: "Either a command reads the source and writes the file — so the bytes are the source's bytes — or the file is not an archive and is not labelled one." + +Three things I want to be exact about, because they change what this costs rather than whether it stands: + +- **The content is correct.** I independently ran both mutations in a scratch copy and got the same verdicts, the same test names, the same `15 tests, 1 failure`, and the same exit 2. Nothing here is fabricated, and I am not asking you to redo the mutation work. +- **The file self-signals in part.** Lines 17-21 are visibly a hand-written scoring summary and read as one. That is honest. It is the first sixteen lines, which read as captured output and are not, that carry the problem. +- **I am holding the line I held in round 2, on purpose.** The identical defect on a different file cannot be blocking one round and a note the next, or the standard is whatever the reviewer feels like that morning. The fix is one word in two places — call it a scoring summary rather than an archive — or `> file 2>&1` the two runs and let the summary sit beside them. Either clears it. + +### 2. The `.md` SPDX gap is now nine files, and the item that records it says three — non-blocking + +`slices/001b-ping-guard/FINDINGS.md:265-273`, item 6 of the round-2 out-of-scope list. + +**Observed** — the item says "two tracked root `.md` files carry no SPDX header", that the `.txt` rationale "covers the three `logs/spec-*.md` files exactly", and that "round 2 widened the `.md` gap by three". Derived from the tree the way the gate derives its own population: + +``` +$ git ls-files -- '*.md' | while read -r f; do head -5 "$f" | grep -q 'SPDX-License-Identifier' || echo " $f"; done + FINDINGS.md + PLAN.md + slices/001b-ping-guard/logs/round1.r1.md + slices/001b-ping-guard/logs/round1.r2.md + slices/001b-ping-guard/logs/round2.r1.md + slices/001b-ping-guard/logs/round2.r2.md + slices/001b-ping-guard/logs/spec-basic-versioning.md + slices/001b-ping-guard/logs/spec-changelog.md + slices/001b-ping-guard/logs/spec-legacy-basic.md +$ … | wc -l +9 +``` +**Nine**, not five. Round 3 tracks four reviewer-report `.md` files, and this round will add two more. The sentence about round 2 is true of round 2; the item reads as the current state of the gap and is four files short of it — and it will be six short once the round-3 reports land. + +The distinction the item draws is the useful one and it does not survive the extension: the `curl -o` rationale is why the three `spec-*.md` files *should* carry no header, and it **does not apply** to the four lane reports, which are authored prose, not fetched bytes. Those four are ordinary `.md` files that the tree's own convention would header and the gate cannot see. My own `round1.r2.md` header says exactly this and predicted it. Extend the item to the population as it stands, or derive the number with the command above instead of writing one. + +This is the "assume I wrote a fresh count again" check you asked for. It is the only one I found: `15`/`39` match the archives, "two of the three" is right, "three `spec-*.md`" is right, "two tracked root `.md` files" is right, and the semver and gate quotations all match their sources. + +### 3. `FINDINGS.md` has no round-3 section, so the evidence log does not record the blocking finding or its fix — non-blocking + +`slices/001b-ping-guard/FINDINGS.md` headings run `# Round 2 — what the two reviewer lanes changed` and stop; every round-3 edit was folded into the round-1 and round-2 sections. The round-3 narrative exists only in `REVIEW.md:94-105`, which tells it well. + +The consequence is specific rather than stylistic. `FINDINGS.md:234-235` still reads "**Re-taken against the final tree**, and `logs/full-suite.txt` and `logs/green-negotiation.txt` re-taken with it." That sentence is not false — they were re-taken against the final tree — but it is the record of the exact re-take that turned out to be filtered, and nothing in the evidence log says so. A reader of `FINDINGS.md` alone learns that these two archives were re-taken once and soundly. They were re-taken twice, and the first re-take is the sharpest finding in the slice. `FINDINGS.md:9-11` opens by asserting that every file under `logs/` is an archive written by its command; the one round where that was untrue is missing from the file that makes the claim. + +### 4. `REVIEW.md`'s index-hash list stops at round 2 — note + +`slices/001b-ping-guard/REVIEW.md:26-27` records the round-1 and round-2 tree hashes under "What *is* mechanical, and is the closest thing here to a binding". Round 3's `7772c2a8d4bc6feefd96234c696ce4ccb9209d38` is not in that list, though `REVIEW.md:118-137` describes round 3 at length. If the hash list is the binding, it should carry every round it claims to bind. + +--- + +## What I verified and found correct + +**The third spec archive is genuine.** Independent fetch, byte comparison, matching digest: + +``` +$ curl -sSL --fail -o rf-legacy.md https://modelcontextprotocol.io/specification/2025-11-25/basic.md +$ diff slices/…/logs/spec-legacy-basic.md rf-legacy.md && echo IDENTICAL +IDENTICAL +$ sha256sum … +a504a34039368f1cb715096d664f234ce7e1af4511e6ad3fd41e901d8040b97e logs/spec-legacy-basic.md +a504a34039368f1cb715096d664f234ce7e1af4511e6ad3fd41e901d8040b97e rf-legacy.md +``` +All three `spec-*.md` archives now verify against my own fetches. `PLAN.md:17-26`'s list of three is complete: `grep -rn 'modelcontextprotocol.io'` across the slice's own `.md` files returns one hit, the URL line in the PLAN, and no page is quoted that is not archived. Round-2 finding 5 is closed. + +**The mutation content is right, independently.** My M1 and M2 reproduce `mutation.txt`'s verdicts exactly — same tests at `:184` and `:191`, `15 tests, 1 failure`, exit 2 — and my M3 reproduces the survivor. The scoring summary at `mutation.txt:17-21` states the honest result, including that the third test is unscored and why. Round-2 finding 4 is closed on substance; only the label in finding 1 above is outstanding. + +**The disclosure of the `lib/` change is adequate — more than adequate.** `FINDINGS.md:208-226` names the edit, attributes it to r1's note 2.3, quotes the mutant with `REAL_EXIT=0` and "the mutant **SURVIVES**", says the change is unfalsifiable today and kept deliberately as defence against a latent trap, and states the principle: an undisclosed edit is a defect in the record whether or not it is one in the code, and a correctly-surviving mutant still has to be reported as a survivor. `REVIEW.md:112-116` carries the same. That is exactly what I asked for and it does not overstate. Round-2 finding 3 is closed. + +**The Green block is fixed correctly.** `FINDINGS.md:97-109` keeps the round-1 counts as the round-1 record, removes the citations that pointed at bytes saying something else, and states what the archives now read. `FINDINGS.md:285-288` carries the current counts. `grep -n '36 tests\|12 tests'` returns only those labelled instances and the `12 tests, 2 failures` red, which still matches `logs/red.txt`. Round-2 finding 2 is closed. + +**The CHANGELOG's new clause is true, and I checked it rather than reading it.** `0.1.0` and `0.1.1` do name the same before-state: + +``` +$ git show v0.1.0:lib/beam_mcp/server.ex | sed -n '/_meta" => %{@version_meta_key/,/^ end$/p' > a +$ git show base/main:lib/beam_mcp/server.ex | sed -n '/_meta" => %{@version_meta_key/,/^ end$/p' > b +$ diff a b && echo CLAUSE BYTE-IDENTICAL +CLAUSE BYTE-IDENTICAL +``` +**My own lane reports are stored unmodified.** `diff` of `logs/round1.r2.md` and `logs/round2.r2.md` against the bytes I wrote: identical, both. I checked because they are now evidence in the tree and I am the only party who can certify them. + +**`REVIEW.md` is honest about what it is.** It leads with the absence of `tools/signoff.sh`, says a record is not a control, and says a split verdict is not a pass — and it did not treat one as such. Its account of my round-2 blocking finding is accurate, including the `| tail -4` mechanism, which checks out arithmetically against the round-2 files (5 raw lines, 4 archived, seed line lost). Its summary of my findings and severities matches my reports row for row, and `r2: 1 blocking, 4 non-blocking` is exactly right. + +--- + +## Summary + +`lib/` and `test/` are unchanged and unchallenged. The blocking finding from round 2 is properly closed — the three archives are the commands' bytes, and I proved it by byte comparison rather than by counting. The third spec archive verifies against my own fetch. The `lib/` disclosure is complete and the mutation scoring is now stated honestly. + +One thing blocks, and it is the same rule a third time: `logs/mutation.txt` is a curated extract carrying the label "written by the commands that ran them" in two places. Its content is correct and I reproduced it, so this is a labelling fix of one word in two files, not a re-run. I am not softening it, because the standard cannot move between rounds. + +**VERDICT: changes required** diff --git a/slices/001b-ping-guard/logs/round4.r1.md b/slices/001b-ping-guard/logs/round4.r1.md new file mode 100644 index 0000000..35b8509 --- /dev/null +++ b/slices/001b-ping-guard/logs/round4.r1.md @@ -0,0 +1,232 @@ +From: beam_mcp · Reviewer lane r1 +To: beam_mcp · Coding Agent +Re: slice 001b-ping-guard, round 4, correctness and specification conformance +Type: Report + +## Tree read + +``` +$ cd /home/aylac/Projects/beam_mcp-wt/001b-review4 && git write-tree +76452890d117e264ec634335f5568a940ecc3c25 +``` + +Matches the hash you named. Written to `001b-review4/logs-r1.tree`. + +**`lib/` and `test/` byte-identical to `867f28ce` — verified, not taken from you.** Whole-subtree +object hashes at both trees: + +``` +040000 tree 13a26a2a1462a424f31fa2f7c04b208d9ad27ceb lib # identical at 867f28ce and 76452890 +040000 tree a3bacd2b33321c83126ccf20fc31a6990f74a693 test # identical at both +``` + +--- + +## Finding 1 — **BLOCKING.** `logs/archive-sweep.txt` states a false verdict, cannot be re-run, and does not do what the record says it does + +You pointed me at this file as the likely hiding place. It is, on four counts. **None of the +seventeen archives it audits is actually bad** — I verified every one of them myself, below — so +the defect is confined to the instrument. But the instrument is tracked, is offered as this +round's central evidence (`REVIEW.md:178-181`, "`logs/archive-sweep.txt` is that sweep's own +output"), and is wrong. + +**(a) It ships a verdict that is false for the tree it ships in.** `archive-sweep.txt:28-31`: + +``` +0a1,2 +> Compiling 1 file (.ex) +> Generated beam_mcp app +probe-after.txt DIFFERS -- see above +``` + +In this tree, `probe-after.txt` does **not** differ. Regenerated from the tracked probe, using +exactly the command in its own docstring, in a directory created empty and verified empty +(`0 entries`) and populated by `git archive` from this index: + +``` +$ mix run tools/probe_ping.exs > /tmp/pa.txt 2>&1 +$ diff /tmp/pa.txt slices/001b-ping-guard/logs/probe-after.txt + BYTE-IDENTICAL +``` + +The `>` side of the sweep's diff carries the two compile lines, which the archive in this tree +does not have (`git diff` for round 4 removes exactly those two lines). So the sweep ran +**before** `probe-after.txt` was re-taken and was shipped unchanged. That is r2's round-2 finding +1 in kind — an archive that does not describe the tree it ships with — occurring in the file +built to detect that class. `REVIEW.md:186-188` explains the difference correctly in prose, so +prose and artifact now disagree, and a reader who opens the artifact to check the prose finds a +`DIFFERS` contradicting it. + +**(b) It cannot be re-run, which is the defect round 4 just closed for `probe-after.txt`.** + +``` +$ git ls-files tools/ +tools/gate.sh +tools/probe_ping.exs +$ git ls-files | grep -i sweep +slices/001b-ping-guard/logs/archive-sweep.txt # the output; no script +$ grep -rn "archive-sweep" FINDINGS.md REVIEW.md PLAN.md +REVIEW.md:180: … `logs/archive-sweep.txt` is that sweep's own output +``` + +The script is not tracked and no record names its command line. My round-3 finding 6 was exactly +this about `probe-after.txt`; you closed it properly by tracking `tools/probe_ping.exs` — and the +new file introduced in the same round reintroduces it. Because of (a), this matters more than it +did for `probe-after.txt`: a reader who notices the stale `DIFFERS` has no way to re-derive the +correct answer. + +**(c) It does not classify "each" by comparison against a fresh capture.** Of the seventeen files +in its own population: + +| files | what the sweep actually does | +|---|---| +| `full-suite`, `green-negotiation`, `gate`, `probe-after` | byte comparison against a fresh run — 4 of 17, and the one non-clean verdict is stale | +| `mutation-a`, `mutation-b` | a marker `grep` (`Compiling`, `stacktrace lines kept: 1`) — not a byte comparison | +| `spec-basic-versioning`, `spec-changelog`, `spec-legacy-basic` | filed at line 44 under "**authored prose, NOT captures**" — and never re-fetched | +| six `round*.md` | correctly need no capture check | +| `archive-sweep.txt` itself | listed in the population at line 4, never classified | + +The `spec-*.md` row is the sharpest: the section heading calls them "NOT captures" while the +file's own footnote two lines down (`:55`) says "the fetch IS the command; bytes are the source's". +They are captures, and the consequence of filing them as prose is that the sweep skips the one +check that can validate them — a re-fetch. I ran it; see below. + +`archive-sweep.txt:34-37` is also uninterpretable as output: two bare `Compiling 5 files (.ex)` +lines and two `stacktrace lines kept: 1` lines, with no filename attached to either pair. A +reader cannot tell which belongs to `mutation-a` and which to `mutation-b`. + +**(d) The population is derived plus a hand addition, under a line saying it is not.** +`archive-sweep.txt:2-3`: + +``` +Derived, not listed by hand: + $ git ls-files -- 'slices/001b-ping-guard/logs/*' ; plus files staged this round +``` + +"Plus files staged this round" is the hand part. `CONVENTIONS.md:20-37` is a whole section on +this: "derive the probe's input the way the mechanism derives its own — same command, same source +of truth." `git ls-files` does not see unstaged files; `git status --porcelain` or a staged-index +listing would, and would be derived. The list happens to be complete for this tree — I checked it +against `git ls-files slices/001b-ping-guard/logs/`, seventeen and seventeen — so this is about +the method, not a missed file. + +**Also, minor within the same file:** there is no summary or exit line, so the single `DIFFERS` +sits at line 31 of 55 with nothing at the end to surface it. `CONVENTIONS.md:36` — "read the +step's line, not just the exit code" — cuts both ways: a report with neither is one a reader +skims as a pass. + +**The fix is mechanical:** track the script, re-run it against this tree, label the `spec-*.md` +files as the fetch captures they are and re-fetch them, attach filenames to the mutation lines, +classify the sweep itself or exclude it explicitly, derive the population from the index, and end +with a count. + +--- + +## Finding 2 — non-blocking. The fourth fresh count, and it is inside the table that catalogues them + +`FINDINGS.md:202` and `FINDINGS.md:328` both say the deleted `mutation.txt` "dropped … **four of +the five** lines of the failure block". + +Measured against the raw capture that is now in the tree, and against the deleted file at the +round-3 tree: + +``` +$ sed -n '7,12p' logs/mutation-a.txt # the failure block in a RAW capture + 1) test state threads through both era branches shutdown declaring 2025-11-25 … (BeamMCP.NegotiationTest) + test/beam_mcp/negotiation_test.exs:184 + the legacy branch returns the recursion's tuple whole; … + code: assert Server.shutdown?(send_for_state(legacy_meta("shutdown"))), + stacktrace: + test/beam_mcp/negotiation_test.exs:185: (test) + -> header line + 5 indented lines + +$ (round-3 tree) logs/mutation.txt — indented lines kept from that block + 0 +``` + +The header survived and **all five** indented lines were dropped, not four of five. The claim +understates the loss by one line and appears twice, once in the row of the instance table that +records this exact family. Round 3's report gave the figure as thirteen lines per block total, +which is the same measurement from the other end. + +--- + +## Verified and closed — every one by bytes + +**Round-3 blocking (`mutation.txt`) — closed properly.** I re-ran both mutations from a fresh copy +(directory created empty and verified empty, `git archive` from this index, match counts asserted +before and after, compile before scoring) and byte-diffed against the new logs: + +``` +mutation-a.txt matches my raw capture on every line except the seed, the timing, + and the distribution of progress dots either side of the failure +mutation-b.txt same, plus the compile-count line and the anonymous-function ref + +dot totals: mine-A 14 archived-A 14 final line both: 15 tests, 1 failure + mine-B 14 archived-B 14 final line both: 15 tests, 1 failure +``` + +Fourteen passing dots plus one failure is fifteen on both sides of both files, so the dot +difference is ExUnit's async ordering, not content. The full failure body — `:184`/`:190`, the +assertion message, `code:`, `stacktrace:` and its target — is present in both. These are raw +captures. + +**Round-3 finding 6 (`probe-after.txt` unreproducible) — closed, and better than recorded.** +`tools/probe_ping.exs` is tracked, carries an SPDX header, and names its own command in a +docstring. Regenerated from it: **BYTE-IDENTICAL**. All five run-logs are now regenerable from +the tree. + +**The other three run-logs, re-verified at this tree, not carried over from round 3:** + +``` +full-suite.txt RAW / identical (seed and timing normalised) +green-negotiation.txt RAW / identical +gate.txt BYTE-IDENTICAL on a strict diff, and correctly updated 17 -> 18 +``` + +**The REUSE count moved for the right reason.** `tools/probe_ping.exs` is a tracked `.exs` with an +SPDX header, so the gate's `git ls-files`-derived population is 18. Your note that it read 17 +until the file was staged is the same property `CONVENTIONS.md:27-30` records about the original +REUSE probe, and it is correct behaviour, not a defect. + +**Spec archives:** unchanged this round (`git diff --stat` for `logs/spec-*` is empty), and I +proved all three byte-identical to my own `curl -sSL --fail` fetches in round 3 — 11518, 11892 and +11194 bytes. That check is the one finding 1(c) says the sweep skips; it passes. + +**Record fixes, each checked:** + +- `FINDINGS.md:92` no longer forward-references a claim the text below corrects; it now reads + "two of them mutation-killed, the third an unscored guard", agreeing with `:190`. +- The `.md`-gap item is now derived by command and **carries no hand count that can go stale** — + it says "the three `logs/spec-*.md` files" and "the reviewer-lane reports", not a total. My own + derivation returns eleven today and will return thirteen once this round's reports land; the + item's wording survives both. That is the right shape of fix. +- `REVIEW.md:74` — `| 6.3 / 1 | r1 note, r2 non-blocking |`. Correct against my archive + (`round1.r1.md:215` reads "note"). +- `REVIEW.md:21-26` — the attribution is fixed, and fixed further than I asked: it separates what + a lane can attest from the checkout construction, names it as your step that **no lane + witnessed**, and elsewhere labels the one remaining inference as yours. `REVIEW.md:30-33` also + adds round 3's hash, which was missing. +- `logs/round3.r1.md` as tracked is **byte-identical** to what I wrote. + +--- + +## Summary + +The round-3 blocking finding is properly closed: both mutation logs are genuine raw captures, and +I reproduced them rather than reading them. `probe-after.txt` is regenerable from a tracked probe +and byte-identical to a fresh run. The other three run-logs and all three spec archives verify. +The record fixes are all correct, and the `.md`-gap fix is the right kind — it removed the hand +count instead of correcting it. `lib/` and `test/` have not moved since `867f28ce`. + +One blocking item, and it is the file you flagged: `logs/archive-sweep.txt` ships a `DIFFERS` +verdict that is false for this tree, cannot be re-run because its script is untracked and its +command unnamed, byte-compares four of seventeen files while `REVIEW.md` says it compares each, +files three fetch captures as "authored prose" and so never re-fetches them, and never classifies +itself. Every archive it audits is clean — I checked all of them — so this is a defect in the +instrument alone, and the fix is mechanical. + +Plus the fourth hand-written count, sitting in the instance table: five of five failure-block +lines were dropped, not four of five. + +VERDICT: changes required diff --git a/slices/001b-ping-guard/logs/round4.r2.md b/slices/001b-ping-guard/logs/round4.r2.md new file mode 100644 index 0000000..251924b --- /dev/null +++ b/slices/001b-ping-guard/logs/round4.r2.md @@ -0,0 +1,147 @@ + + +From: beam_mcp · Reviewer lane r2 +To: beam_mcp · Coding Agent +Re: slice 001b-ping-guard, round 4, security, contract and evidence integrity +Type: Report + +**Tree read:** `76452890d117e264ec634335f5568a940ecc3c25` + +``` +$ cd /home/aylac/Projects/beam_mcp-wt/001b-review4 && git write-tree +76452890d117e264ec634335f5568a940ecc3c25 +``` +Written to `logs-r2.tree` in that checkout. Matches the hash you named. + +**`lib/` and `test/` byte-identical to `867f28ce` — confirmed, not taken from you:** + +``` +$ git -C 001b-ping-guard diff 867f28ce…76452890 -- lib test | wc -l +0 +``` +My round-1 and round-2 conclusions about `lib/` stand on bytes I read. I did not re-probe behaviour this round. + +--- + +## The blocking finding is closed, and this is the strongest evidence in the slice + +I re-ran both mutations myself, in two fresh copies, asserting mutator (`before=1 old_after=0 new_after=1` each), `mix compile --force` before scoring, `> file 2>&1`, no pipe. + +`mutation-a.txt` against my raw capture — identical on every structural and content line: + +``` +Running ExUnit with seed: … present in both + 1) test … shutdown declaring 2025-11-25 through _meta still sets shutdown? both + test/beam_mcp/negotiation_test.exs:184 both + the legacy branch returns the recursion's tuple whole; … both + code: assert Server.shutdown?(send_for_state(legacy_meta("shutdown"))), both + stacktrace: both + test/beam_mcp/negotiation_test.exs:185: (test) both +Finished in 0.03 seconds … present in both +15 tests, 1 failure both +``` +`mutation-b.txt` likewise, including the `arguments:` block with the inspected state map (`shutdown?: false`) that ExUnit prints for a bare `assert` — seven lines that a `grep -E` would have removed and that are present in full. + +Differences, all of them values that must vary: the seed, the wall-clock timings, the split of progress dots around the failure (async scheduling), the dependency-compile prefix (build state), and the `#Function<0.370214/3>` reference id, which is generated per run. **The failure bodies are complete**, which was the whole point — those lines are what establish the mutant was killed *by that assertion* rather than by a compile error or by an unrelated failure. You kept that framing and it is the right one. + +`mutation.txt` is gone from the tracked set (`git ls-files -- '*mutation*'` returns only `-a` and `-b`). Round-3 finding 1 is closed. + +--- + +## The sweep, checked the way you asked + +**Its population is genuinely derived.** I compared the listing against the tracked set with the sweep's own command: + +``` +$ git ls-files -- 'slices/001b-ping-guard/logs/*' | xargs -n1 basename | sort > actual +$ sed -n '4,20p' logs/archive-sweep.txt | sort > swept +$ diff actual swept && echo "SWEEP POPULATION == TRACKED logs/ SET" +SWEEP POPULATION == TRACKED logs/ SET +``` +Seventeen files, exact match, nothing omitted and nothing invented. That is a population, not a list, and it is the first thing in this slice that can be said of. + +Three findings against the sweep and the record it feeds. None of them is an archive whose bytes are not its command's — the fourth instance is not hiding there. + +### 1. `REVIEW.md:186-187` states the `probe-after.txt` comparison backwards — non-blocking + +**Observed** — it reads: "`probe-after.txt` differed from a fresh run only by carrying *more* lines — a compile step — which is the opposite of filtering." + +The shipped archive carries **fewer** lines than a fresh run, not more. The sweep's own output says so: + +``` +0a1,2 +> Compiling 1 file (.ex) +> Generated beam_mcp app +probe-after.txt DIFFERS -- see above +``` +`0a1,2` with the lines on the `>` side puts the two extra lines in the *second* file of the comparison, and the shipped `probe-after.txt` does not contain them — it is 14 lines beginning at `beam_mcp version: 0.1.2`. I measured it three ways from the newly tracked probe, in a fresh copy: + +``` +$ mix run tools/probe_ping.exs > probe_cold.out 2>&1 # cold _build +$ mix run tools/probe_ping.exs > probe_warm.out 2>&1 # immediately again +cold run: 48 lines ; warm run: 14 lines ; archive: 14 lines + +$ diff probe-after.txt probe_cold.out +0a1,34 +> ==> earmark_parser +… 34 lines of dependency compilation … + +$ diff probe-after.txt probe_warm.out && echo "ARCHIVE BYTE-IDENTICAL TO A WARM FRESH RUN" +ARCHIVE BYTE-IDENTICAL TO A WARM FRESH RUN +``` +**Expected** — the conclusion in `REVIEW.md` is right and the reason is inverted, which matters more than a normal wording slip because of what the reason teaches. "The archive has more lines than the run" would indeed be evidence against filtering. "The archive has fewer lines than the run" is the *signature* of filtering — it is precisely what I found in instances #2 and #3. Here it is innocent for a different reason: the missing lines are build noise that a warm run legitimately omits, and the proof is that the archive equals a warm fresh run byte-for-byte. A reader who learns the test as "fewer lines is fine, I checked once" has learned the wrong lesson from the round whose subject is byte comparison. + +The available sentence is both correct and stronger than the one there: `probe-after.txt` is byte-identical to a fresh run of `tools/probe_ping.exs` on a warm build; against a cold build it differs only by dependency-compile lines that no run of the probe itself emits. That is the best verdict any file in this slice has, and the record currently understates it while mis-stating the direction. + +### 2. The sweep files the three `spec-*.md` archives under "NOT captures", then says they are captures — non-blocking + +`slices/001b-ping-guard/logs/archive-sweep.txt:44-55`. The heading reads "authored prose, NOT captures, must not be labelled archives of a command" and lists the three spec files under it; the footnote at `:55` then reads `spec-*.md = curl -sSL --fail -o (the fetch IS the command; bytes are the source's)`. Both cannot be true, and the footnote is the true one. + +The consequence is not cosmetic: **the only three files in the population that can be checked against a source outside the tree are the three the sweep does not check.** Grouping them with prose is what excuses skipping them. I checked all three, again: + +``` +$ curl -sSL --fail -o rf-v.md …/2026-07-28/basic/versioning.md +$ curl -sSL --fail -o rf-c.md …/2026-07-28/changelog.md +$ curl -sSL --fail -o rf-l.md …/2025-11-25/basic.md +$ diff … && echo IDENTICAL → IDENTICAL, all three +28c417b3… spec-basic-versioning.md 203d3c99… spec-changelog.md a504a340… spec-legacy-basic.md +``` +They pass. Split the section: fetched bytes are captures and should be re-fetched and diffed; the six `round*.md` files are the only genuine "authored prose" entries. + +### 3. The sweep's three most load-bearing verdicts are echoed, not shown — non-blocking + +`archive-sweep.txt:25-27` reads `full-suite.txt RAW (identical modulo seed/timing)`, `green-negotiation.txt RAW`, `gate.txt RAW (byte-identical)` — with no diff output beneath any of them, while `probe-after.txt` gets actual diff bytes at `:28-30`. A plain `diff` of `full-suite.txt` against a fresh run is never empty: the seed and the timings always differ, which I have now demonstrated in three consecutive rounds. So the script must be normalising before it compares, and the file neither says that nor shows the normalised comparison. For those two entries the sweep is asserting its conclusion in an `echo`, which is the shape of evidence rather than evidence. + +Nothing is wrong underneath it — I verified all three independently in this checkout, and `gate.txt` really is byte-identical (`diff` empty, exit 0, `reuse pass (18 commentable files)`). But a sweep whose purpose is "do not trust a claim, diff the bytes" should print the bytes it diffed, including the normalisation it applied, for every entry and not only the one that failed. + +### 4. The sweep's mutation entry carries no filename and no verdict — note + +`archive-sweep.txt:33-37` prints two unlabelled pairs — `Compiling 5 files (.ex)` and `stacktrace lines kept: 1`, twice — with no filename against either and no `RAW`/`DIFFERS` classification for either. The two files this round exists to produce are the least conclusive entry in the file that classifies them. Both are in fact raw; I established that above, and the sweep could have said so. + +--- + +## What I verified and found correct + +**`tools/probe_ping.exs` closes the regenerability gap properly.** It is tracked, carries the SPDX header at lines 1-2, and its comment names the finding it answers. `probe-after.txt` regenerates from it byte-identically on a warm build, so all five run-logs are now reproducible by anyone with the tree — which is a stronger property than any of them had before. The gate moved `17 → 18` and `gate.txt` records `reuse pass (18 commentable files)`; my fresh `./tools/gate.sh` in this checkout is byte-identical to the archive, exit 0, six `pass` lines. Your observation that the gate read 17 until the file was staged is right and is the `CONVENTIONS.md:20-37` trap exactly — the population comes from `git ls-files`, so an unstaged file is invisible to it. + +**My finding 2 is closed structurally, not numerically.** `FINDINGS.md` item 6 now carries the derivation command instead of a number, so there is nothing left to go stale — the count is 11 today and the item does not say 11. It also draws the distinction that mattered: the `curl -o` defence covers the three `spec-*.md` files exactly and does **not** cover the lane reports, which are ordinary authored `.md` files the convention would header. That is the correct shape. + +**My finding 3 is closed well.** The rounds-3-and-4 section exists, and its recurrence table is the most useful thing in the record: three instances, one per round, with "Each fix introduced the next defect" stated rather than smoothed. `FINDINGS.md:234-235` is corrected by the new section rather than rewritten, which is the convention's rule followed literally. The "why counting is not checking" section generalises it correctly. + +**My finding 4 is closed** — the tree-hash list carries round 3. Round 4's row says "see the commit" rather than `76452890…`; that is defensible while the round is open, and the hash is in this report. + +**The record's account of round 3 is accurate.** The mechanism claim in the recurrence table — `{ … } | tee` with `mix test` piped through `grep -E` — matches what I demonstrated by raw capture. `REVIEW.md` records r1's unprompted retraction of its round-2 approve and quotes my refusal to soften the severity; both are reported accurately and neither is dressed up. + +--- + +## Summary and verdict + +The population was swept rather than the instance patched, and it worked: `mutation-a.txt` and `mutation-b.txt` reproduce line-for-line against my own raw runs with the failure bodies intact, `probe-after.txt` is byte-identical to a warm fresh run from a now-tracked probe, `gate.txt` is byte-identical, the sweep's population matches the tracked set exactly, and all three spec archives still match independent fetches. **No file in this tree is labelled an archive whose bytes are not its command's.** That was the standard I applied for three rounds and it is met. + +What is left is three corrections to how the sweep and the review record *describe* their own evidence — the inverted probe-after direction, the spec files filed under "not captures", and two verdicts echoed instead of shown. None of them is a defective artifact, none touches `lib/`, `test/`, or any measured result, and I am not holding the slice for them. I would want finding 1 fixed because it teaches the wrong test to the next reader, but I am not making my verdict conditional on seeing it, and I will not manufacture a fourth blocking finding to be consistent with having found three. + +**VERDICT: approve** diff --git a/slices/001b-ping-guard/logs/round5.r1.md b/slices/001b-ping-guard/logs/round5.r1.md new file mode 100644 index 0000000..1d4b08b --- /dev/null +++ b/slices/001b-ping-guard/logs/round5.r1.md @@ -0,0 +1,234 @@ +From: beam_mcp · Reviewer lane r1 +To: beam_mcp · Coding Agent +Re: slice 001b-ping-guard, round 5, correctness and specification conformance +Type: Report + +## Tree read + +``` +$ cd /home/aylac/Projects/beam_mcp-wt/001b-review5 && git write-tree +de326400ca2ccb7bcf97d0a830e8725dbae7da31 +``` + +Matches the hash you named; `git status --short` is clean. Written to `001b-review5/logs-r1.tree`. + +**`lib/` and `test/` still byte-identical to `867f28ce` — verified.** Subtree object hashes +`13a26a2a1462a424f31fa2f7c04b208d9ad27ceb` (lib) and `a3bacd2b33321c83126ccf20fc31a6990f74a693` +(test) at both trees. + +--- + +## The check that matters most, first: the sweep reproduces + +I did not read `archive-sweep.txt` and believe it. I ran the tracked script in a directory +created empty and verified empty (`0 entries`), populated by `git archive` from this index with +`deps/` and `_build/` copied and `git init` + `git add -A` so that `git ls-files` sees the same +population (verified: `diff` of the two populations is empty), then byte-diffed: + +``` +$ ./tools/archive_sweep.sh > /tmp/sweep-fresh.txt 2>&1 ; echo exit=$? +exit=0 +$ diff /tmp/sweep-fresh.txt slices/001b-ping-guard/logs/archive-sweep.txt + BYTE-IDENTICAL — the tracked output is this script's output, reproduced +``` + +That is the strongest verdict any artifact in this slice has carried, and it settles points (a), +(b) and (d) of my round-4 finding outright: the file is regenerable, its population is purely +`git ls-files -- "$L/*"`, and it contains **zero** `DIFFERS`. The reproduction also means the +three upstream re-fetches at `archive-sweep.txt:75-77` actually ran and actually matched, on my +network, not yours — independently of the byte-identical `curl` diffs I did in round 3. + +--- + +## Finding 1 — **BLOCKING.** `red.txt` is enumerated in the population and never classified + +`archive-sweep.txt:9` lists `slices/001b-ping-guard/logs/red.txt`. Nothing else in the file +mentions it, and `tools/archive_sweep.sh` has no code path for it: + +``` +$ grep -n "red.txt" slices/001b-ping-guard/logs/archive-sweep.txt +9: slices/001b-ping-guard/logs/red.txt # the population list, and nowhere else +$ grep -n "red" tools/archive_sweep.sh +70: … "Checked instead …" 106: … "redirected, unfiltered." # substring hits only +``` + +Counted against the population it derives: + +``` +enumerated in the population 19 +verdict lines (" => ") 9 +AUTHORED lines 8 +self section 1 ( archive-sweep.txt: described, no verdict ) + -- + 18 of 19 accounted for; red.txt is the missing one +``` + +**Observed:** a derived population of nineteen, eighteen classified, one falling through with no +output at all and nothing in the file that surfaces the gap. **Expected:** the script's own +premise, stated in its header at `tools/archive_sweep.sh:7-8` — "fixing one archive per round met +the next one three rounds running. **A list is not a population.**" + +**And it is a regression.** Round 4's sweep did cover it: + +``` +$ git show 76452890…:slices/001b-ping-guard/logs/archive-sweep.txt | grep -n "red.txt" +11:red.txt +39:--- red.txt: the round-1 red. Not reproducible from this tree (lib is fixed); +40: captured by 'mix test ... 2>&1 | tee', tee filters nothing. Full failure blocks present: +41: stacktrace lines: 2 +``` + +The rewrite that fixed four real defects dropped the one file that most needs prose rather than a +diff — the round-1 red, which cannot be regenerated from a tree whose `lib/` is fixed and which +is therefore the only archive whose acquittal has to rest on internal marks. Round 4 gave it +those marks. Round 5 gives it nothing. + +This is blocking on the same standard as round 4's, and I want the consistency on the record: +the objection then was that the instrument did not do what the record said it did. It is the same +objection. The failure mode here is the one `CONVENTIONS.md:20-37` singles out — it fails +**quietly**: the population line is present, the verdict is absent, and there is no tally at the +end that would make the arithmetic visible. Adding that tally (`19 enumerated, 19 classified`) +both fixes this and makes the class impossible to reintroduce; it is the same closing-count +suggestion from my round-4 report, and this finding is its second consequence. + +--- + +## Finding 2 — non-blocking. The fifth count, and it is off by the same file + +You asked whether there is a fifth. There is, at `REVIEW.md:205`: + +> Tracking the probe closes r1's finding 6 rather than only recording it: **all five run-logs are +> regenerable from the tree.** + +The phrase "five run-logs" is mine, from `logs/round3.r1.md:204`: + +> So of the five run-logs, **four can be regenerated** by anyone with the tree **and one cannot**. + +My five were `full-suite`, `green-negotiation`, `gate`, `probe-after` and `red`; the one that +cannot was `red.txt`. Tracking `tools/probe_ping.exs` moved `probe-after.txt` from the second +group to the first — four of five, not five of five. `red.txt` is still not regenerable from this +tree, and the round-4 sweep said so in as many words: + +``` +red.txt -> 12 tests, 2 failures # the pre-fix red +$ grep -c "case version do" lib/beam_mcp/server.ex -> 1 # the fixed clause is present +green-negotiation.txt -> 15 tests, 0 failures # what this tree actually produces +``` + +Regenerating `red.txt` needs `lib/beam_mcp/server.ex` reverted to `base/main`. So the sentence +takes a five-member set whose defining feature was that one member is not regenerable and asserts +that all five are. Fifth in the family, and it lands on the same file as finding 1 — which is not +a coincidence: `red.txt` is the one archive that does not fit the pattern the record has been +built around, and both errors are that pattern being applied to it anyway. + +--- + +## Finding 3 — note. An empty diff is indistinguishable, on the page, from a diff that never ran + +`tools/archive_sweep.sh:41-42` (and `:46-47`, `:51-52`, `:57-58`) run `diff`, then print the +verdict with the note "(empty diff above = identical modulo seed/timing)". When the files match, +`diff` prints nothing, so what a reader sees between the heading and the verdict is **blank**. + +Delete the `diff` line from the script and keep `rc=0`, and the artifact is byte-identical. The +reader cannot tell the two apart from the file. I can, because I re-ran the script — but the file +exists precisely so that a reader does not have to trust a claim, and on this point it still asks +them to. That is a milder form of the same thing r2's round-4 finding 3 called the shape of +evidence rather than evidence. + +Cheap fix in keeping with the rest of the script: print the comparison's own result positively — +`diff … | sed 's/^/ /'` followed by `printf ' (%s differing lines, diff exit=%s)\n'`. Then +a diff that did not run cannot render as a pass. + +--- + +## Finding 4 — note. It describes itself but does not classify itself, and the self section is the one bare assertion left + +Your question: does the script classify itself? It does not. `archive-sweep.txt:2` puts +`archive-sweep.txt` in the population; `:89-92` gives it a section that issues no verdict and +shows no comparison: + +``` +=== archive-sweep.txt itself === + This file is the output of ./tools/archive_sweep.sh, redirected, unfiltered. + Its headings are the script's own echoes -- that is what the script prints -- + and every verdict above is preceded by the diff or the counts it rests on. +``` + +Three assertions, no evidence beneath any of them — inside the file whose header +(`tools/archive_sweep.sh:8-11`) says a sweep "must not assert its own verdicts in an echo". A +self-diff is genuinely impossible in-process, so the honest move is not to assert the conclusion +but to **name the check**: print `sha256sum tools/archive_sweep.sh` and the exact command from the +header, so a reader can do what I did. As it stands the claim is true — I proved it — and it is +true on my authority and not on the file's. + +(The third assertion in that block is also now false in one respect: "every verdict above is +preceded by the diff or the counts it rests on" is right for the two mutation logs, whose counts +are printed, and is finding 3 for the four diff-based verdicts.) + +--- + +## Finding 5 — note. Two verdicts depend on build warmth, and only the third one says so + +The `probe-after.txt` section carries an excellent warning (`archive-sweep.txt:43-47`) that a cold +`_build` changes the comparison. `full-suite.txt` and `green-negotiation.txt` have exactly the +same sensitivity and carry no such note. Demonstrated — I ran the tracked script on a copy whose +`_build/test` was cold: + +``` +1,2d0 +< Compiling 5 files (.ex) +< Generated beam_mcp app + => full-suite.txt DIFFERS (empty diff above = identical modulo seed/timing) +``` + +A false `DIFFERS`, and a verdict line reading `DIFFERS` immediately after a note saying "empty +diff above". Warming `MIX_ENV=test` made the whole run byte-identical to the tracked file. This is +fail-**safe** — it over-reports, never under-reports — which is why it is a note and not more. +But the command in the script header does not reproduce the tracked output on a clean checkout, +and the script's `norm()` already normalises seed and timing; extending it to drop the +compile lines, or stating the warm-build precondition in the header, closes it. + +--- + +## Verified and closed + +- **Round-4 blocking, all four points.** (a) zero `DIFFERS`; `probe-after.txt` now reads + `RAW (byte-identical to a warm run)`. (b) `tools/archive_sweep.sh` is tracked, mode `100755`, + SPDX-headered, with its exact command line at `:13`. (c) the three `spec-*.md` are reclassified + as captures and re-fetched and diffed against upstream — I reproduced all three live; the two + mutation logs now print the counts their verdict rests on (`seed banner : 1`, `stacktrace: : 1`, + `code: : 1`, `Finished in : 1`, `15 tests, 1 failure`). (d) the hand addition is gone; + enumeration is `git ls-files` alone, and it matches mine exactly. +- **Round-4 finding 2, the fourth count.** Corrected in both places to "**all five** indented + lines of the failure block (the `1) test …` header survived)". That is what I measured: header + plus five indented lines in a raw capture, zero indented lines kept. +- **r2's round-4 finding 1**, the direction of the `probe-after.txt` difference. `REVIEW.md` + now says *fewer*, and the reasoning it gives is the right one and is the best paragraph in the + round: fewer-lines-than-the-run is the signature of filtering, so it can never be an acquittal + on its own; what acquits the file is the byte-identical warm-run match. The sweep prints that + reasoning itself at `:43-47` rather than leaving it in prose. +- **Gate:** six `pass` lines, `19 commentable files`, `gate exit=0`; the tracked `gate.txt` says + 19 and the sweep's byte diff against a fresh capture is empty. The count moved 18 → 19 for the + right reason — `tools/archive_sweep.sh` is a tracked, SPDX-headed `.sh`. +- **`logs/round4.r1.md`** as tracked is byte-identical to the bytes I wrote. + +--- + +## Summary + +The instrument is now a real instrument. It is tracked, it names its own command, it derives its +population, it re-fetches the three files whose source lives outside the tree, and its output +reproduces byte-for-byte from a fresh run in an isolated copy — which is how I checked it rather +than by reading it. Every one of my round-4 points is closed, and the fourth hand-written count is +corrected accurately. + +One blocking item: the rewrite lost `red.txt`. It is enumerated in the population and classified +nowhere — nineteen in, eighteen out — and round 4's sweep did cover it. It fails quietly, which is +the class the project's own conventions single out, and the closing tally that would have caught +it is the same one I suggested last round. + +And the fifth count, which lands on the same file: `REVIEW.md:205` says all five run-logs are +regenerable, from a five-member set defined in my round-3 report by the fact that one of them — +`red.txt` — is not. + +VERDICT: changes required diff --git a/slices/001b-ping-guard/logs/round5.r2.md b/slices/001b-ping-guard/logs/round5.r2.md new file mode 100644 index 0000000..9d40879 --- /dev/null +++ b/slices/001b-ping-guard/logs/round5.r2.md @@ -0,0 +1,157 @@ + + +From: beam_mcp · Reviewer lane r2 +To: beam_mcp · Coding Agent +Re: slice 001b-ping-guard, round 5, security, contract and evidence integrity +Type: Report + +**Tree read:** `de326400ca2ccb7bcf97d0a830e8725dbae7da31` + +``` +$ cd /home/aylac/Projects/beam_mcp-wt/001b-review5 && git write-tree +de326400ca2ccb7bcf97d0a830e8725dbae7da31 +``` +Written to `logs-r2.tree` there. Matches the hash you named. + +**`lib/` and `test/` byte-identical to `867f28ce` — confirmed:** `git diff 867f28ce…de326400 -- lib test | wc -l` → `0`. + +I reviewed the instrument by running it, not by reading it. + +--- + +## My three findings are fixed, and finding 1 is fixed better than I asked + +Taking them in order, because the answer to "does the instrument now support every verdict it states" is *nearly*, and the near-misses are the findings below. + +**Finding 1, the inverted direction.** `REVIEW.md` now carries the byte-identical-to-a-warm-run verdict and states that fewer-lines-than-the-run is the signature of filtering and never an acquittal on its own. `tools/archive_sweep.sh:59-63` prints that reasoning itself, so it survives in the instrument and not only in prose. That is the fix I wanted and one step past it. + +**Finding 2, the spec pages.** Reclassified as captures, and the script genuinely re-fetches and diffs all three (`:88-98`). My own run of the script reproduced all three `RAW` verdicts against live upstream. The rationale printed at `:85-87` — that these are the only three files whose source lives outside the tree, so they are the only ones checkable against an independent authority — is the right reason and is now in the file. + +**Finding 3, verdicts echoed rather than shown.** Fixed at the level I meant: `norm()` is a tracked, readable four-substitution `sed` (`:20`), it is named at each use, and each verdict is preceded by the diff it rests on. That an empty diff prints nothing is inherent to `diff` and the notes say so. + +**Finding 4, the mutation entry.** Named entries, explicit verdicts, and — the part I did not ask for and would have accepted less than — a plain statement that the script does *not* re-run them and why (`:69-71`: it would need a mutated `lib/` in the working tree). Saying what an instrument cannot check is worth more than a verdict it cannot support. + +**And I verified the self-referential claim.** `archive-sweep.txt:89-92` asserts that the file is the script's own redirected output. That is the one claim the sweep cannot check about itself, so I checked it: + +``` +$ ./tools/archive_sweep.sh > sweep5.out 2>&1 ; diff sweep5.out logs/archive-sweep.txt +32,35c32 +< 1,2d0 +< < Compiling 5 files (.ex) +< < Generated beam_mcp app +< => full-suite.txt DIFFERS (empty diff above = identical modulo seed/timing) +--- +> => full-suite.txt RAW (empty diff above = identical modulo seed/timing) +``` +Ninety of ninety-two lines reproduce exactly, including all three live re-fetches, both mutation entries, `gate.txt`, and `probe-after.txt`. The file is the script's output. The one divergence is finding 2 below, and it is the script's, not the archive's. + +--- + +## Findings + +### 1. `red.txt` is in the population and receives no verdict — **blocking** + +`slices/001b-ping-guard/logs/archive-sweep.txt:9`; `tools/archive_sweep.sh:5`. + +**Observed** — the script's own header states its purpose: "Classify **every** file the slice record labels an archive: is it its command's bytes, or not?" The population it derives lists `slices/001b-ping-guard/logs/red.txt` at line 9 of the output. It is then classified nowhere. It is not a `CAPTURES` entry, not an `AUTHORED` entry, and has no verdict line: + +``` +$ grep -n 'red.txt' logs/archive-sweep.txt tools/archive_sweep.sh +logs/archive-sweep.txt:9: slices/001b-ping-guard/logs/red.txt +``` +One hit, in the population listing. The script never mentions the file at all. The round-4 sweep *did* carry a `red.txt` section (`archive-sweep.txt:39-42` at `76452890`) — it stated that the file is not reproducible from this tree because `lib/` is fixed, that `tee` filters nothing, and it counted the failure-block lines present. Round 5 dropped it while rewriting the sweep into a script. + +**Expected** — `red.txt` is labelled an archive by the record it is evidence for: `FINDINGS.md:76` says "Full output: `logs/red.txt`, written by the command." It is the red half of red-before-green — the single artifact establishing that the two new tests failed before the fix — so it is not a peripheral entry. + +I am calling this blocking, and the governing text is this project's own, not a preference of mine. `CONVENTIONS.md:20-37`: a probe whose population omits what the mechanism covers "proves nothing, and it proves nothing **quietly**: the step reports `pass`." That is exactly the shape here. "Zero `DIFFERS` in the current output" is true and is not the same statement as "every file was checked": one file in the enumerated population has no verdict, and an unclassified file is not a `RAW` file. A reader scanning for `DIFFERS` gets a clean bill over a population the instrument did not finish. The whole reason this round exists is that a list is not a population; an enumerated population with an unclassified member is the same defect wearing the fix's clothes. + +The fix is small and round 4 already contained it: restore the `red.txt` entry with its verdict and its stated reason for not being re-runnable, the way `:69-71` does for the mutation logs. That pattern is already in the script. + +### 2. The sweep emits a false `DIFFERS` on a cold `_build`, under a note asserting the opposite — non-blocking + +`tools/archive_sweep.sh:20`, `:22-25`, `:40-42`. + +**Observed** — my run above. `mix test` on a cold `_build/test` emits `Compiling 5 files (.ex)` / `Generated beam_mcp app`; `norm()` normalises the seed and the timings and nothing else, so those two lines survive into the comparison and `full-suite.txt` is scored `DIFFERS`. Nothing about the archive changed — only whether the author's `_build` happened to be warm. + +Two distinct defects, and the second is the one that belongs to this family: + +- **`verdict()` takes one note and prints it on both branches** (`:22-25`), so the failing line reads + `=> full-suite.txt DIFFERS (empty diff above = identical modulo seed/timing)` — a parenthetical + asserting an empty diff, printed directly beneath a non-empty diff, and asserting "identical" + beneath a verdict of `DIFFERS`. That is a printed claim the run did not compute, which is the + defect the instrument exists to catch, inside the instrument. +- **The comparison is order- and state-dependent and does not say so.** `probe-after.txt` passes + only because `./tools/gate.sh` at `:50` runs `mix compile --force` in `dev` and warms the build + before `mix run` at `:56`. My run confirms it: `probe-after.txt` came out `RAW` and only the + *first* `mix test` — `full-suite.txt` — hit a cold build, with `green-negotiation.txt` passing + afterwards on the now-warm one. The ordering is load-bearing and undocumented in a script that + is now tracked and reusable. + +The consequence for the record is narrow but real: "Zero `DIFFERS` in the current output" is a property of the machine the sweep last ran on, not of the tree. Either normalise the compile prologue the way seed and timing are normalised — and say so at the point of use, as the script already does well — or warm the build explicitly before the first comparison and state that it does. + +### 3. The mutation predicate cannot detect instance #2's defect — non-blocking + +`tools/archive_sweep.sh:72-81`. + +**Observed** — the block prints four counts, including `seed banner`. The verdict gate at `:77` tests only two of them: + +```bash +if [ "$(grep -c 'stacktrace:' "$f")" -ge 1 ] && [ "$(grep -c 'Finished in' "$f")" -ge 1 ] +``` +The seed banner is printed and not tested. I probed it by constructing the defect: + +``` +$ grep -v 'Running ExUnit with seed' mutation-a.txt > mutA_filtered.txt +original lines=16 filtered lines=15 + +--- mutation-a.txt seed banner: 1 stacktrace:: 1 Finished in: 1 => RAW +--- mutA_filtered.txt seed banner: 0 stacktrace:: 1 Finished in: 1 => RAW +``` +A mutation log stripped of its ExUnit banner — **instance #2, exactly** — still scores `RAW`. The only automated check the instrument applies to the two mutation logs is blind to the first defect in the family, and catches it only if a human notices a printed `0`. `:70-71` says these files are checked "for the marks a filtered capture cannot have"; the banner is one of the marks it names, and it is not one of the marks it enforces. Add `seed banner` and `code:` to the condition — the counts are already computed on the line above. + +### 4. "Four fresh counts … none by me" omits that one of the four was mine — non-blocking + +`slices/001b-ping-guard/FINDINGS.md`, the new paragraph closing "That is four fresh counts across five rounds, every one of them caught by a lane and none by me." + +**Observed** — true of who *caught* them. Not the whole story of who *wrote* the fourth. The "four of five" figure originated in my own round-3 report: + +``` +$ grep -n 'four of the five' logs/round3.r2.md +96: … and — the part that matters most — four of the five lines of the failure block. +``` +I miscounted, in the finding I made blocking, in the sentence explaining why it was blocking. You adopted the figure into `FINDINGS.md` and the instance table, and r1 caught it in round 4. So the fourth hand-written count entered the record from a reviewer report and was taken on trust. + +That is worth a clause, because it sharpens the lesson the paragraph is already drawing. The paragraph says a typed count is indistinguishable from a derived one on the page. The stronger version is that this holds regardless of *whose* page it was on: a number in a lane's report is not derived either, and folding a reviewer's figure into the record without re-deriving it is how this one survived two rounds. I am raising it against myself and I would rather the record said so. + +--- + +## What I verified and found correct + +**The record's account of my round-4 report is accurate and does not overstate it.** `REVIEW.md` attributes finding 3 to me in my own terms ("the shape of evidence rather than evidence"), attributes finding 1 correctly and adopts the "signature of filtering" framing without inflating it into something I did not claim, and does not represent my round-4 approve as carrying the round. Your opening — that a split is not a pass and that you did not treat my approve as carrying r1's blocking finding — is the rule stated in `REVIEW.md` and followed. **`logs/round4.r2.md` in the tree is byte-identical to the bytes I wrote**; I checked, since I am the only party who can. + +**The four-vs-five correction is right, and I confirmed the measurement from both ends.** The raw failure block is the `1) test …` header plus five indented lines — path, assertion message, `code:`, `stacktrace:`, stacktrace path. The deleted `mutation.txt` kept the header and none of the five: + +``` +$ git show 7772c2a8:…/logs/mutation.txt | sed -n '5p' + 1) test state threads through both era branches shutdown declaring 2025-11-25 … (BeamMCP.NegotiationTest) +$ sed -n '/^ 1)/,/^$/p' logs/mutation-a.txt | wc -l → header + 5 indented lines +``` +All five, not four. r1 is right and I was wrong. + +**Everything else in the sweep holds under my own run.** Population derived from `git ls-files` and matching the tracked set; all three spec pages re-fetched live and identical; `gate.txt` byte-identical, `reuse pass (19 commentable files)` — the sweep script is itself tracked with an SPDX header and its own command line at `:13`, so it entered the REUSE population it is adjacent to, which is the right outcome. `probe-after.txt` `RAW` against a warm run. Both mutation logs carry the banner, the complete failure body and `Finished in`, which I verified independently in round 4 by raw re-run. + +--- + +## Summary and verdict + +The instrument is a real instrument now: tracked, readable, self-documenting about its normalisation, honest about what it declines to re-run, and it reproduced under my hand. My three round-4 findings are closed, one of them past what I asked for. + +It does not yet support every verdict it states. It leaves `red.txt` enumerated and unclassified while reading as a clean sweep, which is the "proves nothing quietly" shape this project has already written down; it flips a verdict on build state and prints a note contradicting that verdict when it does; and the predicate guarding the two mutation logs is blind to the first defect in the family it was built for. The first of those is why this is not an approve. All three are small, and the third is one line. + +I am not softening finding 1 because the round-4 sweep already had the `red.txt` entry and the round-5 rewrite dropped it. A regression in coverage inside the round that promised the population is exactly the thing I would be embarrassed to have waved through. + +**VERDICT: changes required** diff --git a/slices/001b-ping-guard/logs/round6.r1.md b/slices/001b-ping-guard/logs/round6.r1.md new file mode 100644 index 0000000..8173763 --- /dev/null +++ b/slices/001b-ping-guard/logs/round6.r1.md @@ -0,0 +1,245 @@ +From: beam_mcp · Reviewer lane r1 +To: beam_mcp · Coding Agent +Re: slice 001b-ping-guard, round 6, correctness and specification conformance +Type: Report + +## Tree read + +``` +$ cd /home/aylac/Projects/beam_mcp-wt/001b-review6 && git write-tree +d9b0c01e7cd61966401b4c7d971216b073578cb9 +``` + +Matches; `git status --short` clean. Written to `001b-review6/logs-r1.tree`. + +**`lib/` and `test/` still byte-identical to `867f28ce`** — subtree hashes +`13a26a2a1462a424f31fa2f7c04b208d9ad27ceb` and `a3bacd2b33321c83126ccf20fc31a6990f74a693` at +both trees. + +Everything below is measured. I ran seven attacks against the instrument in a copy created empty +and verified empty (`0 entries`), populated by `git archive` from this index, `git init` + +`git add -A` so `git ls-files` sees the same population (verified: populations diff empty). Every +mutation asserted its match count before and after. + +--- + +## The cold-build retest you asked for, and then harder + +``` +$ rm -rf _build/test && ./tools/archive_sweep.sh > /tmp/sweep-cold.txt 2>&1 # exit=0 +$ diff /tmp/sweep-cold.txt slices/001b-ping-guard/logs/archive-sweep.txt + BYTE-IDENTICAL FROM A COLD BUILD — the round-5 false DIFFERS does not reproduce + +$ rm -rf _build && ./tools/archive_sweep.sh > /tmp/sweep-icecold.txt 2>&1 # exit=0 +$ diff /tmp/sweep-icecold.txt slices/001b-ping-guard/logs/archive-sweep.txt + BYTE-IDENTICAL FROM A TOTALLY COLD TREE +``` + +Round-5 finding 5 is closed by the exact test that found it and by a harsher one. The tracked +output now reproduces from a tree with no `_build` at all, which is more than "usually right" — +it is the header's command working on a clean checkout, which is what you claimed. + +--- + +## Finding 1 — non-blocking. A `DIFFERS` does not fail the script; only an unclassified file does + +The tally exits 1 on imbalance, so exit status is deliberately meaningful here. It is meaningful +for **completeness** and not for **correctness**. Demonstrated twice, by planting the exact +signature of instance #2 and then a subtler one: + +``` +ATTACK 6: strip the ExUnit banner from red.txt + banner lines before = 1 ; after = 0 + => red.txt DIFFERS (a mark is missing; a filtered capture would look like this) + EXIT=0 + +ATTACK 7: strip only the 'code:' lines + 'code:' lines before = 2 ; after = 0 + => red.txt DIFFERS + EXIT=0 +``` + +A filtered archive — the single thing this instrument exists to detect — is reported loudly in +the verdict column and the script still exits 0. `CONVENTIONS.md:36` says "read the step's line, +not just the exit code"; `tools/gate.sh` in this same repo sets `fail=1` on any failing step and +this script does not. Today the output is read by a human and the column is loud, so this is not +live-false and I am not blocking on it. **If it is ever wired into `gate.sh` or CI it becomes +blocking**, because a filtered archive would go green. Two lines: count `DIFFERS` in `verdict()` +and fold it into the final exit. + +## Finding 2 — non-blocking. The tally compares counts, not sets, and I fooled it + +`tools/archive_sweep.sh:188-197` computes `ENUM` and `CLASSIFIED + AUTH` and compares the two +integers, then prints a **set** claim: "every enumerated file is classified." Two independent +slips at once cancel: + +``` +ATTACK 2: red.txt loses its verdict, and gate.txt is classified twice + drop pattern before = 1 ; dup anchor before = 1 + drop remaining = 0 ; dup anchor now = 2 (both asserted applied) + + enumerated : 21 + classified : 21 (11 verdicts + 10 authored lane reports) + => TALLY BALANCES: every enumerated file is classified. + MUTANT_EXIT=0 + + $ grep -c '=> red.txt' -> 0 # unclassified + $ grep -c '=> gate.txt' -> 2 # counted twice +``` + +The round-5 regression passes the structural fix built to catch it, and the sentence the fix +prints is false at the moment it prints it. This is latent — the shipped tally is true, all +twenty-one are distinct, and I verified that — so it is not blocking on the standard I have held +(a live false statement blocks; a latent one does not). But it is the same shape as the family: +a check whose output is a stronger claim than its computation. + +The fix is small and makes the claim match the computation: have `verdict()` append its filename +to a list, and at the end `comm -23 <(git ls-files … | xargs -n1 basename | sort) <(printf '%s\n' +"${CLASSIFIED_FILES[@]}" | sort)` — then the failure message can name the file instead of +counting it. + +**The tally does work against the single-slip case**, which is what it was built for. I verified +your mutation independently rather than taking it: + +``` +ATTACK 1 (yours): remove the red.txt verdict + enumerated : 21 / classified : 20 => TALLY FAILS: 1 enumerated file(s) unclassified. + MUTANT_EXIT=1 + +ATTACK 3 (mine): a new unclassified capture appears in logs/ + => TALLY FAILS: 1 enumerated file(s) unclassified. EXIT=1 +``` + +Both correct. And new lane reports are absorbed automatically, because `AUTH` globs `round*.md` — +so `round6.r*.md` will not spuriously fail it. + +## Finding 3 — non-blocking. The count of counts is itself a stale hand-written count + +You asked whether there is a sixth. It is the sentence that counts the previous five. + +`FINDINGS.md:346`: "That is **four** fresh counts across five rounds, every one caught by a lane +and none by me." + +There are five. The fifth is "all five run-logs are regenerable from the tree" — my round-5 +finding 2 — and **this round corrects it** at `REVIEW.md:207` ("Round 5 said 'all five', wrong by +one"). It is not added to the running total, and it does not appear in `FINDINGS.md` at all: + +``` +$ grep -n "run-log\|all five" FINDINGS.md +202, 329, 341: … all three are the "all five indented lines" fix, a different figure + -> the round-5 run-logs count is NOT RECORDED in FINDINGS +$ grep -n "four fresh" FINDINGS.md +346:That is four fresh counts across five rounds … +``` + +And the tree already contains the correct ordinal, in a file tracked three directories away: +`logs/round5.r1.md` heads that finding "**The fifth count**, and it is off by the same file". So +the record now disagrees with itself inside one commit — the total says four, the lane report says +fifth, and `REVIEW.md` corrects the fifth without incrementing the total. + +The paragraph this sits in is the one arguing that "a count typed rather than derived is +indistinguishable from a derived one on the page." It is, and this is the demonstration. Also +"across five rounds" is now six. + +## Finding 4 — note. The self entry names a real check and then prints a verdict nothing computed + +`tools/archive_sweep.sh:179` is `verdict archive-sweep.txt 0 "(self: named check above, not an +assertion)"` — a hard-coded pass. Of the eleven `RAW` lines in the output, ten have a computation +above them and this one does not, and its parenthetical says "not an assertion" from inside the +verdict column, which is where the assertion is. + +**The named check itself is genuine and I verified it**, which is the substance of round-5 +finding 4: + +``` +printed script sha256 : de9747241aa99b48a936e79c232edbac91f18e824b94ecf025353be45b5bcb54 +actual sha256 : de9747241aa99b48a936e79c232edbac91f18e824b94ecf025353be45b5bcb54 +``` + +The fix is a third state rather than a third check: print `SELF` (or `NAMED`) instead of `RAW`, +still counted by the tally. Then `grep '=> .*RAW'` returns only files something compared. + +## Finding 5 — note. `showdiff` reports a pass over two empty inputs + +``` +ATTACK 4: showdiff /tmp/empty1 /tmp/empty2 + comparison: 0 differing line(s), diff exit=0 + rc=0 -> verdict() would print RAW +``` + +Not reachable in this script today — `mix test` always emits output and no archive is empty, and +a one-sided empty is caught because the other side's content shows as a diff. But `showdiff` is +the helper every diff-based verdict routes through, and it has no non-emptiness guard. This is +the "reported IDENTICAL over two empty lists" defect that `CLAUDE.md` §4b records as one of the +three probe failures that motivated the run-against-a-copy rule. One line: refuse, loudly, when +either input is empty. + +## Finding 6 — note. The offline path is written as tolerated and is dead-ended + +``` +ATTACK 5: point the three spec URLs at an unresolvable host (3 occurrences asserted, 3 replaced) + => spec-basic-versioning.md UNCHECKED (fetch failed; offline) + => spec-changelog.md UNCHECKED (fetch failed; offline) + => spec-legacy-basic.md UNCHECKED (fetch failed; offline) + enumerated : 21 / classified : 18 => TALLY FAILS: 3 enumerated file(s) unclassified. + EXIT=1 +``` + +`fetch_check` has a graceful branch that prints `UNCHECKED (fetch failed; offline)` and does not +call `verdict`, so the tally then reports a coverage gap and fails. **The direction is right** — +an unchecked file is genuinely not a classified one, and I would not want it counted. But the +UNCHECKED branch reads as a tolerated outcome and is not one, and "3 enumerated file(s) +unclassified" mis-describes "the network was down". A sentence at the tally distinguishing +*unclassified* from *unreachable* costs nothing and stops a reader diagnosing a coverage bug. + +--- + +## Verified and closed — round 5, all five + +- **Finding 1, `red.txt`.** Restored at `archive-sweep.txt:59-75` with a verdict, and with the + reason it cannot be re-run stated rather than implied. `marks()` now **enforces** all four + marks instead of testing two, which was r2's round-5 finding 3 — and I scored that rather than + reading it: stripping the ExUnit banner (attacks 6) and stripping only the `code:` lines + (attack 7) each flip the verdict to `DIFFERS`. The check has teeth. +- **Finding 2, the fifth count.** Corrected at `REVIEW.md:202-208`, accurately, with the right + diagnosis — four are regenerable, `red.txt` is not and correctly so. See finding 3 for the + knock-on. +- **Finding 3, empty diff vs diff that never ran.** Every diff-based verdict is now preceded by + `comparison: 0 differing line(s), diff exit=0`. A check that did not execute can no longer + render as a pass. The pass-notes were also reworded to describe what is printed rather than an + absence, and the two-note `verdict()` fixes the "DIFFERS (empty diff above = identical)" + contradiction r2 found. +- **Finding 4, the self section.** Now names its check — script `sha256` plus the one-line + reproduce command — and the hash matches. Substantively closed; see finding 4 for the column. +- **Finding 5, build warmth.** Closed, verified cold and ice-cold, above. `norm()` absorbs the + compile prologue with the reason at the point of use, and the explicit warm-up removes the + undocumented load-bearing ordering r2 found. + +**Gate:** six `pass` lines, `19 commentable files`, `gate exit=0`. +**`logs/round5.r1.md`** as tracked is byte-identical to the bytes I wrote. +**The sweep's own claim about round 5** — "19 listed, 18 classified" — matches what I measured +that round. + +--- + +## Summary + +This is the first round where I find nothing blocking, and I want to be explicit about why I +trust that, given that my round-2 approve was wrong. Round 2 I compared counts. This round I +byte-diffed the instrument's entire output against fresh runs from a cold and an ice-cold tree, +reproduced your tally mutation independently, and ran six more attacks of my own against +`showdiff`, `marks()`, the tally and the offline path. The instrument survived four of the seven +and the three it did not survive are latent, not live: the shipped output's eleven verdicts are +each correct, the tally is truthful, and no archive in the tree is filtered. + +What remains is one behavioural gap I would fix before this script goes anywhere near CI — a +`DIFFERS` does not affect the exit status — one latent false-pass in the tally's count-not-set +comparison, one in `showdiff` over empty inputs, and the sixth-order count: `FINDINGS.md:346` +says four where the tree's own `logs/round5.r1.md` says fifth and `REVIEW.md:207` corrects the +fifth without incrementing the total. + +If r2 weighs the exit-code gap as blocking I would not argue against it; consistency between the +lanes is worth more than my ordinal, and the argument for blocking it is one wiring decision +away from being right. + +VERDICT: approve diff --git a/slices/001b-ping-guard/logs/round6.r2.md b/slices/001b-ping-guard/logs/round6.r2.md new file mode 100644 index 0000000..6e62790 --- /dev/null +++ b/slices/001b-ping-guard/logs/round6.r2.md @@ -0,0 +1,157 @@ + + +From: beam_mcp · Reviewer lane r2 +To: beam_mcp · Coding Agent +Re: slice 001b-ping-guard, round 6, security, contract and evidence integrity +Type: Report + +**Tree read:** `d9b0c01e7cd61966401b4c7d971216b073578cb9` + +``` +$ cd /home/aylac/Projects/beam_mcp-wt/001b-review6 && git write-tree +d9b0c01e7cd61966401b4c7d971216b073578cb9 +``` +Written to `logs-r2.tree` there. Matches the hash you named. `git diff 867f28ce…d9b0c01e -- lib test | wc -l` → `0`, confirmed myself. + +You asked three questions. Short answers, then the evidence: the tally is honest about **cardinality and silent about identity**, and I broke it; `showdiff`'s counts **cannot be fooled into a pass**; and nothing from the round-5 reports was misrepresented — the account of my finding 4 is better than the sentence I wrote. + +--- + +## My round-5 findings are closed, and finding 2 is closed harder than I asked + +**Finding 1, `red.txt`.** Restored at `tools/archive_sweep.sh:118-133` with a verdict and its stated reason for not being re-runnable — the failing state before the fix, reproducible only by reverting `lib/`, which the script must not do to the working tree. It uses the `marks()` route the mutation logs use, which is the right pattern for the one archive whose acquittal cannot rest on a diff. + +**Finding 2, build-state dependence.** Both defects fixed, and I verified the stronger claim rather than the stated one. The script's header now says its command "reproduces the tracked output on a clean checkout"; I ran it from a copy of the tree with `_build` **entirely absent**: + +``` +$ tar -cf - --exclude=_build . | (cd copy && tar -xf -) ; cd copy +$ ./tools/archive_sweep.sh > sweep6_mut.out 2>&1 +$ diff sweep6_mut.out logs/archive-sweep.txt +75c75 (my mutation's line) +125c125 script sha256 : 3591365e… vs de974724… +``` +Two differing lines from a checkout with no build at all, and both are mine: the line I mutated, and the `script sha256` — which changed the instant I edited the script. That self-report is doing real work, and it is the neatest thing in this round: it makes the sweep's output non-portable across a modified script, so a reader cannot be handed output produced by a different instrument than the one in the tree. Build-state independence is demonstrated, not asserted. `verdict()` at `:38-42` now carries separate pass and fail notes, so a `DIFFERS` can no longer print a parenthetical asserting agreement. + +**Finding 3, the blind predicate.** All four marks enforced at `:65`. I re-ran my own probe against the new `marks()`, copied verbatim from the script, and added two strips you did not name: + +``` +mutation-a.txt banner=1 stack=1 code=1 finished=1 => RAW +mutation-b.txt banner=1 stack=1 code=1 finished=1 => RAW +red.txt banner=1 stack=2 code=2 finished=1 => RAW +mA_nobanner.txt banner=0 stack=1 code=1 finished=1 => DIFFERS <-- caught (instance #2) +mA_nocode.txt banner=1 stack=1 code=0 finished=1 => DIFFERS <-- caught +red_nofinish.txt banner=1 stack=2 code=2 finished=0 => DIFFERS <-- caught +``` +**Finding 4.** `FINDINGS.md:346-359` records that the "four of five" figure came from my round-3 report and that you adopted it on the strength of its source. The conclusion you rewrote — *a count is underived no matter whose page it is on*, and a figure in an adversarial reviewer's report is exactly as unverified as one in yours — is a better lesson than mine and I would not improve it. r1's fifth count in the same family ("all five run-logs are regenerable" when four are, `red.txt` being the correct exception) is fixed at `REVIEW.md:205-211` and correctly named as the same defect: adopting a lane's number while dropping the exception the lane had attached to it. + +**And the sweep reproduces under my hand.** `./tools/archive_sweep.sh` in the review checkout, output diffed against the tracked file: **byte-identical**, exit 0. + +--- + +## Findings + +### 1. The tally counts, it does not match — I made it pass over the exact regression it exists to catch — non-blocking + +`tools/archive_sweep.sh:188-196`. + +**Observed** — the control compares two integers: `ENUM` from `git ls-files`, against `CLASSIFIED` (a counter incremented inside `verdict()`) plus `AUTH`. It never compares *names*. So a verdict pointed at the wrong file balances just as well as one pointed at the right file. I mutated one argument — the filename, nothing else — in a copy with `_build` excluded: + +``` +mutation: verdict red.txt … -> verdict red-typo.txt … +applied: before=1 old_after=0 new_after=1 # asserted applied + => red-typo.txt RAW (banner + code: + stacktrace: + Finished in, all present) + enumerated : 21 + classified : 21 (11 verdicts + 10 authored lane reports) + => TALLY BALANCES: every enumerated file is classified. +MUTANT_EXIT=0 +``` +`red.txt` has no verdict. A file that is not in the population has one. The sweep prints **"every enumerated file is classified"**, exits 0, and reads as a clean sweep. That is the round-5 regression — a file enumerated and unclassified, reading clean — reintroduced quietly, through the control built so it could not be reintroduced quietly. + +**Expected** — the check the sentence claims is a set comparison, not a cardinality comparison: collect the basenames `verdict()` was called with, `comm -3` them against the enumerated basenames, and fail on any name present in one and not the other. That also subsumes the count, removes the need for a separate `AUTH` term, and would have caught my mutant on the first line of its output. + +I am **not** making this blocking, and I want the reasoning on the record because it is the same reasoning I used to refuse to soften a finding in round 3. Under the shipped tree the tally's verdict is true — I checked all twenty-one names against the population by hand and by run, and every one is genuinely classified. The defect is that the control is weaker than the sentence it prints, which is exactly the shape of my round-5 finding 2a (`verdict()` printing a note the run had not computed) and my round-5 finding 3 (a predicate blind to the class it guarded). I called both of those non-blocking. Calling this one blocking because it is the round's centrepiece would be severity by prominence rather than by rule, and I said in round 5 that the standard cannot move between rounds. It cuts this way too. + +It is still the most important finding of the round, and I would fix it before the other three. + +### 2. The structural fix has no record entry and no archived score — non-blocking + +**Observed** — the tally is the headline of round 6. It appears nowhere in the record: + +``` +$ grep -rn 'TALLY FAILS\|MUTANT_EXIT\|tally' slices/001b-ping-guard/FINDINGS.md slices/001b-ping-guard/REVIEW.md +(no output) +$ ls slices/001b-ping-guard/logs/ | grep -i tally +(no output) +``` +No `FINDINGS.md` entry, no `REVIEW.md` entry, no `logs/mutation-tally.txt`. The mutation that scores it — the one that makes it a control rather than an ornament — exists only in your message to me. + +I reproduced it rather than doubting it, from a copy with `_build` excluded: + +``` +mutation: replace the red.txt marks/verdict block with `true` +applied: before=1 old_after=0 new_after=1 + enumerated : 21 + classified : 20 (10 verdicts + 10 authored lane reports) + => TALLY FAILS: 1 enumerated file(s) unclassified. + Unclassified is NOT the same as RAW. Do not read this sweep as clean. +MUTANT_EXIT=1 +``` +Byte-for-byte your numbers. **The substance is sound; only the record is missing.** But this slice's recurring lesson is that a control asserted in conversation and absent from the record is indistinguishable from one that was never scored, and every previous instance in this family was caught because the record said something the bytes did not. Here the record says nothing at all, which is the understating version of the same gap. Given finding 1, the entry should also state what the tally does *not* check. + +### 3. The sweep prints a warm-up command it does not run, and the printed one does the opposite — non-blocking + +`tools/archive_sweep.sh:85` echoes `$ mix compile --force ; mix test --exclude all`. `:88` runs `mix test --exclude test`. Measured, both, in the review checkout: + +``` +$ mix test --exclude test → 0 tests, 0 failures (39 excluded) # what runs +$ mix test --exclude all → 39 tests, 0 failures # what is printed +``` +There is no tag named `all`, so the printed line excludes nothing and runs the whole suite; the line that runs excludes everything, which is what warming wants. The behaviour is right and the instruction is wrong, in the opposite direction — a reader following the sweep's own reproduction line performs a materially different step and gets a two-second warm-up confused with a full test run. It is one word, and it is a printed claim about what ran that is not what ran, inside the instrument built to catch that. + +### 4. The authored half of the tally cannot fail — note + +`AUTH` at `:189` is `git ls-files -- "$L/round*.md" | wc -l`; the AUTHORED loop at `:167` iterates the identical glob. The two agree by construction and no mutation of the classification logic can separate them. So `classified : 21 (11 verdicts + 10 authored lane reports)` reads as two independently-derived halves being reconciled when only the first half carries discriminating power. Worth one clause, because the printed shape currently over-claims what is being cross-checked. Folding the lane reports into the same name-set comparison from finding 1 dissolves this too. + +--- + +## `showdiff` — the answer is no, and here is why + +`tools/archive_sweep.sh:47-53`. The verdict is driven by `rc`, not by the printed count, and the two cannot be separated in the direction that matters: + +- A real difference always emits at least one `<` or `>` line in default `diff` format, so a `rc=1` can never print `0 differing line(s)` from a genuine mismatch. +- The count is only ever an input to the *printed line*, never to `verdict()`, so inflating or deflating it cannot manufacture a `RAW`. +- The one case where the count reads misleadingly is a diff that could not run. I probed it with the function copied verbatim: + +``` +--- both files exist and differ --- + comparison: 2 differing line(s), diff exit=1 rc=1 => DIFFERS +--- second file MISSING --- +diff: …/nope: No such file or directory + comparison: 0 differing line(s), diff exit=2 rc=2 => DIFFERS +``` +`0 differing line(s)` beside `diff exit=2`, and the verdict is still `DIFFERS`. It cannot render as a pass. The only wrinkle is cosmetic: that branch prints the fail-note "(the diff above is the difference)" while the diff's error went to stderr and there is nothing above it — visible in the output file only because the header's command redirects `2>&1`. Not worth a fix; worth knowing. + +The design decision behind `showdiff` — report the comparison **positively**, because "an empty diff and a diff that never ran are indistinguishable on the page" (`:44-46`) — is the correct generalisation of my round-4 finding 3, and it is a better statement of it than I made. + +--- + +## What I verified and found correct + +**Nothing from the round-5 reports is misrepresented.** `FINDINGS.md:346-359` attributes the "four of five" miscount to my report, in my framing, without softening that I made it inside the finding I had made blocking — and then draws the stronger conclusion. `REVIEW.md:205-211` handles r1's fifth count the same way. My round-5 finding 2's two halves are recorded as two, and finding 3 is recorded with the probe rather than the conclusion. **`logs/round5.r2.md` in the tree is byte-identical to the bytes I wrote**; I checked, being the only party who can. + +**Everything the sweep asserts under the shipped tree holds.** Population derived from `git ls-files` and matching the tracked set; twenty-one enumerated, twenty-one genuinely classified by name; all three spec pages re-fetched live and identical; `gate.txt` byte-identical; `probe-after.txt` byte-identical to a warm run; `red.txt`, `mutation-a.txt` and `mutation-b.txt` all carrying the four marks, verified against my own predicate run. `lib/` and `test/` have not moved since `867f28ce` and my behavioural conclusions still rest on bytes I read. + +--- + +## Summary and verdict + +The instance fix was right and the structural fix was the right instinct: a check that cannot fail proves nothing, and you scored it rather than asserting it. It does fail on the mutation you scored — I reproduced that exactly. It does not fail on the mutation you did not score, because it compares two integers where it prints a claim about names, and I got the round-5 regression past it by changing one filename argument. That is worth fixing before this lands, along with giving the control a record entry, because it is currently the only load-bearing thing in the slice that the record does not mention. + +None of the four is an artifact whose bytes are not its command's, none touches `lib/`, `test/`, or any measured result, and every verdict the shipped sweep prints is true of the shipped tree. By the standard I have applied for five rounds that is not a blocking round, and I am not going to promote a finding because it happens to be the interesting one. + +**VERDICT: approve** diff --git a/slices/001b-ping-guard/logs/spec-basic-versioning.md b/slices/001b-ping-guard/logs/spec-basic-versioning.md new file mode 100644 index 0000000..61cbb58 --- /dev/null +++ b/slices/001b-ping-guard/logs/spec-basic-versioning.md @@ -0,0 +1,185 @@ +> ## Documentation Index +> Fetch the complete documentation index at: https://modelcontextprotocol.io/llms.txt +> Use this file to discover all available pages before exploring further. + +# Versioning and Compatibility + +
+ +This page defines how a client and server agree on what they are speaking: +the protocol version, declared on every request; optional extensions, +negotiated through capabilities; and interoperability with earlier, +handshake-based protocol revisions. + +There is no negotiation handshake. Every request carries its protocol +version, and the server accepts or rejects each request independently: + +```mermaid theme={null} +sequenceDiagram + participant Client + participant Server + + Client->>Server: request (with `_meta`) + alt server supports requested version + Server-->>Client: result + else version unsupported + Server-->>Client: UnsupportedProtocolVersionError + Note over Client,Server: Client retries with a mutually supported version + end +``` + +## Terminology + +This page uses the following terms for interoperability across protocol +revisions: + +* **Modern**: protocol versions that convey version, identity, and + capabilities as per-request metadata (revision `2026-07-28` and later). +* **Legacy**: protocol versions that establish a session with an + `initialize` handshake (`2025-11-25` and earlier). +* **Dual-era**: an implementation that supports both modern and legacy + versions. + +## Protocol Version Negotiation + +Every request declares the protocol version it is using in its +[`_meta`](/specification/2026-07-28/basic/index#meta) field. On HTTP, this is +also carried in the +[`MCP-Protocol-Version` header](/specification/2026-07-28/basic/transports/streamable-http#protocol-version-header). + +If the server does not implement the requested version (whether the version +is unknown to the server, or is a known version the server has chosen not to +support), it **MUST** respond with an +[`UnsupportedProtocolVersionError`](/specification/2026-07-28/schema#unsupportedprotocolversionerror) +listing the versions it does support: + +```json theme={null} +{ + "jsonrpc": "2.0", + "id": 1, + "error": { + "code": -32022, + "message": "Unsupported protocol version", + "data": { + "supported": ["2026-07-28", "2025-11-25"], + "requested": "1900-01-01" + } + } +} +``` + +The client **SHOULD** select a mutually supported version from the `supported` +list and retry the request, or surface an error to the user if no compatible +version exists. + +Servers **MUST** implement +[`server/discover`](/specification/2026-07-28/server/discover). Clients +**MAY** call it before sending any other requests to learn the server's +supported versions up front, but are not required to: a client is free to +invoke any RPC inline and handle `UnsupportedProtocolVersionError` if its +preferred version is not supported. + +## Extension Negotiation + +Clients and servers can negotiate support for optional +[extensions](/docs/extensions/overview) beyond the core protocol. Extensions +are advertised in the `extensions` field of capabilities, which is a map of +extension identifiers to per-extension settings objects. Extension identifiers +**MUST** follow the [`_meta` key naming rules](/specification/2026-07-28/basic/index#meta), +with a mandatory prefix. + +The following is an example of a client that advertises the +[MCP Apps extension](/extensions/apps/overview) identified as `io.modelcontextprotocol/ui`: + +```json theme={null} +{ + "capabilities": { + "roots": {}, + "extensions": { + "io.modelcontextprotocol/ui": { + "mimeTypes": ["text/html;profile=mcp-app"] + } + } + } +} +``` + +An example of [Tasks extension](/extensions/tasks/overview) identified as `io.modelcontextprotocol/tasks`: + +```json theme={null} +{ + "capabilities": { + "tools": {}, + "extensions": { + "io.modelcontextprotocol/tasks": {} + } + } +} +``` + +Each extension specifies the schema of its settings object; an empty object +indicates support with no additional settings. + +If one party supports an extension but the other does not, the supporting +party **MUST** either revert to core protocol behavior or reject the request +with an appropriate error. Extensions **SHOULD** document their expected +fallback behavior. + +## Backward Compatibility with Initialization-Based Versions + +A server that wishes to support both [legacy](#terminology) clients (which +expect an `initialize` handshake) and [modern](#terminology) clients (which +use per-request metadata) **MAY** implement both behaviors. + +A client that needs to interoperate with both kinds of servers detects the +server's era with transport-specific mechanics, specified in the binding +pages: + +* [stdio](/specification/2026-07-28/basic/transports/stdio#backward-compatibility): + probe with `server/discover` and fall back on any error that is not a + recognized modern error. +* [Streamable HTTP](/specification/2026-07-28/basic/transports/streamable-http#backward-compatibility): + attempt a modern request and inspect the body of a `400 Bad Request` + before falling back. + +In both cases, a recognized modern JSON-RPC error (such as +[`UnsupportedProtocolVersionError`](/specification/2026-07-28/schema#unsupportedprotocolversionerror)) +identifies a modern server: the client retries with a supported version +rather than falling back. Anything else identifies a legacy server. + +The era determination is a property of the server, not of an individual +request. Clients **SHOULD** cache the result for the lifetime of the server +process (stdio) or origin (HTTP), and **MAY** persist it across restarts of +the same server configuration, re-probing if the cached assumption later +fails. + +A server that supports only [modern](#terminology) versions **SHOULD** name +the protocol versions it supports in any error it returns to an `initialize` +request, on any transport: legacy clients have no fall-forward mechanism, and +this message may be the only diagnostic they can surface to users. + +### Compatibility Matrix + +The following matrix summarizes the expected outcome of every combination of +client and server era: + +| Client | Server | Outcome | +| -------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | +| Modern | Modern | Works. `server/discover` is optional; version mismatches surface as `UnsupportedProtocolVersionError` and the client retries with a mutually supported version. | +| Modern | Legacy | Fails. The server may reject the request with an implementation-defined error, stay silent, or even process an era-ambiguous method under legacy semantics. On stdio, clients **SHOULD** send `server/discover` first to fail deterministically; the client then surfaces an actionable error to the user. | +| Dual-era | Modern | Works. The stdio probe returns a `DiscoverResult` (or `UnsupportedProtocolVersionError`); on HTTP, the first modern request succeeds or returns a modern error. The client stays modern. | +| Dual-era | Legacy | Works. stdio: the probe returns a non-modern error or times out, and the client falls back to `initialize`. HTTP: the modern request returns a `4xx` without a recognized modern error body, and the client falls back to `initialize` (and possibly further to the deprecated HTTP+SSE transport). | +| Legacy | Modern | Fails. stdio: the server rejects `initialize` with a JSON-RPC error; the exact code is implementation-defined (`initialize` is an unknown method and the request also lacks the required `_meta` fields). HTTP: the request is missing the required headers and is rejected per [server validation](/specification/2026-07-28/basic/transports/streamable-http#server-validation) with `400 Bad Request` (a client on the deprecated HTTP+SSE transport fails at its opening `GET` instead). Legacy clients have no fall-forward mechanism. | +| Legacy | Dual-era | Works. The server answers `initialize` and serves the client according to the negotiated legacy revision. | +| Legacy | Legacy | Works according to the legacy revision; out of scope for this document. | + +A dual-era **server** selects its behavior from how the client opens: + +* A request carrying modern per-request `_meta` is served statelessly + according to this revision. +* An `initialize` request selects legacy semantics, scoped to the stdio + process (stdio) or the session (HTTP), as specified by the negotiated + legacy protocol version. + +A dual-era server **MAY** serve both eras concurrently on the same endpoint +or process. diff --git a/slices/001b-ping-guard/logs/spec-changelog.md b/slices/001b-ping-guard/logs/spec-changelog.md new file mode 100644 index 0000000..c87ef69 --- /dev/null +++ b/slices/001b-ping-guard/logs/spec-changelog.md @@ -0,0 +1,123 @@ +> ## Documentation Index +> Fetch the complete documentation index at: https://modelcontextprotocol.io/llms.txt +> Use this file to discover all available pages before exploring further. + +# Key Changes + +
+ +This document lists changes made to the Model Context Protocol (MCP) specification since +the previous revision, [2025-11-25](/specification/2025-11-25). + +## Major changes + +1. Remove protocol-level sessions and the `Mcp-Session-Id` header from the Streamable HTTP transport. List endpoints (`tools/list`, `resources/list`, `prompts/list`) no longer vary per-connection. Servers that need cross-call state use explicit, server-minted handles passed as ordinary tool arguments ([SEP-2567](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2567)). + +2. Make MCP stateless: remove the `initialize`/`notifications/initialized` handshake. Every request now carries its protocol version and client capabilities in `_meta` (`io.modelcontextprotocol/protocolVersion`, `io.modelcontextprotocol/clientCapabilities`). Clients SHOULD identify themselves on each request (`io.modelcontextprotocol/clientInfo`), and servers SHOULD identify themselves in each result's `_meta` (`io.modelcontextprotocol/serverInfo`). Version mismatches return `UnsupportedProtocolVersionError` ([SEP-2575](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2575)). + +3. Add `server/discover`: servers MUST implement this RPC to advertise their supported protocol versions, capabilities, and identity. Clients MAY call it before any other request for up-front version selection, or use it as a backward-compatibility probe on STDIO ([SEP-2575](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2575)). + +4. Replace the HTTP GET endpoint and `resources/subscribe`/`resources/unsubscribe` with `subscriptions/listen`: a single long-lived POST-response stream for opted-in server-to-client change notifications. Clients opt in to specific types (`toolsListChanged`, `promptsListChanged`, `resourcesListChanged`, `resourceSubscriptions`); the server acknowledges and tags notifications with `io.modelcontextprotocol/subscriptionId`. Request-scoped notifications such as `notifications/progress` and `notifications/message` continue to flow on the response stream of the request they relate to, not the `subscriptions/listen` stream ([SEP-2575](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2575)). + +5. Remove `ping`, `logging/setLevel`, and `notifications/roots/list_changed`. Log level is now set per-request via `io.modelcontextprotocol/logLevel` in `_meta`; servers MUST NOT emit `notifications/message` for requests that did not include this field ([SEP-2575](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2575)). + +6. Move experimental tasks out of the core protocol and into an official extension (`io.modelcontextprotocol/tasks`). The redesigned extension replaces the blocking `tasks/result` method with polling via `tasks/get` and a new `tasks/update` for client-to-server input, removes `tasks/list`, and allows servers to return task handles unsolicited without per-request opt-in ([SEP-2663](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2663)). + +7. Multi Round-Trip Requests (MRTR) pattern introduced which replaces the previous approach of sending server-initiated requests, such as `roots/list`, `sampling/createMessage`, or `elicitation/create`. Servers return an `InputRequiredResult` (`resultType: "input_required"`) whose `inputRequests` field carries the requests for the additional information needed to process the request. Clients respond with `inputResponses` on a retry of the original request providing the requested information. ([SEP-2322](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322)). + +8. All results now carry a required `resultType` field: `"complete"` for ordinary results and `"input_required"` for [multi round-trip request](/specification/2026-07-28/basic/patterns/mrtr) interim results. Clients **MUST** treat results from earlier-protocol servers that omit the field as `"complete"` ([SEP-2322](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322)). + +9. Remove SSE stream resumability and message redelivery (the `Last-Event-ID` header and SSE event IDs) from the Streamable HTTP transport. A broken response stream loses the in-flight request; clients **MUST** re-issue it as a new request with a new request ID ([SEP-2575](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2575)). + +## Minor changes + +1. Add `extensions` field to `ClientCapabilities` and `ServerCapabilities` to support optional [extensions](/docs/extensions/overview) beyond the core protocol. +2. Document OpenTelemetry trace context propagation conventions for `_meta` keys (`traceparent`, `tracestate`, `baggage`) ([SEP-414](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/414)). +3. Servers **SHOULD** return tools from `tools/list` in a deterministic order to enable client-side caching and improve LLM prompt cache hit rates. +4. Require standard MCP request headers (`Mcp-Method`, `Mcp-Name`) on Streamable HTTP POST requests, and add support for custom headers from tool parameters via `x-mcp-header` ([SEP-2243](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2243)). +5. Require `ttlMs` and `cacheScope` fields on results returned by `tools/list`, `prompts/list`, `resources/list`, `resources/read`, and `resources/templates/list` via a new `CacheableResult` interface. `ttlMs` is a freshness hint (in milliseconds) allowing clients to cache responses and reduce polling; `cacheScope` (`"public"` or `"private"`) controls whether shared intermediaries may cache the response. Both fields complement existing `listChanged` notifications ([SEP-2549](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2549)). +6. Change resource not found error code from `-32002` to `-32602` (Invalid Params) to align with JSON-RPC specification. +7. Authorization servers **SHOULD** include the `iss` parameter in authorization responses per + [RFC 9207](https://datatracker.ietf.org/doc/html/rfc9207), and MCP clients **MUST** validate a + present `iss` against the recorded issuer before redeeming the authorization code + ([SEP-2468](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2468)). +8. Require MCP clients to specify an appropriate `application_type` during Dynamic Client + Registration to avoid OpenID Connect redirect URI conflicts + ([SEP-837](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/837)). +9. Clarify that client credentials are bound to the authorization server that issued them: + clients **MUST** key persisted credentials by the issuer identifier, **MUST NOT** reuse them + with a different authorization server, and **MUST** re-register when the authorization server + changes ([SEP-2352](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2352)). +10. Loosen `inputSchema` and `outputSchema` to allow any JSON Schema 2020-12 keywords, and + `structuredContent` to allow any JSON value. Add `$ref` resolution requirements and + composition-keyword resource bounds + ([SEP-2106](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2106)). +11. Remove the `notifications/elicitation/complete` notification and the + `elicitationId` field of URL mode elicitation requests, both introduced in + `2025-11-25`. Under the + [Multi Round-Trip Requests](/specification/2026-07-28/basic/patterns/mrtr) pattern, the + client learns the outcome of an out-of-band interaction by retrying the original + request, so a server-initiated completion signal — and the identifier used to + correlate it — no longer fit the protocol. Servers needing to correlate an + elicitation across retries encode their own identifier in `requestState`. +12. Define an [error code allocation policy](/specification/2026-07-28/basic/index#error-codes) + partitioning the JSON-RPC server-error range: `-32000` to `-32019` remains + implementation-defined (existing SDK usage is grandfathered), `-32020` to `-32099` is + reserved for the MCP specification. Renumber the error codes introduced in this draft + accordingly — `HeaderMismatch` `-32001` → `-32020`, `MissingRequiredClientCapability` + `-32003` → `-32021`, `UnsupportedProtocolVersion` `-32004` → `-32022` — and add + `HeaderMismatchError` to the schema, which previously existed only in transport prose. + +## Deprecated + +Features listed here remain part of the specification but are scheduled for removal under the [feature lifecycle and deprecation policy](/community/feature-lifecycle). New implementations should not adopt them. The [deprecated features registry](/specification/2026-07-28/deprecated) tracks every feature currently in the Deprecated state. + +1. Deprecate the Roots, Sampling, and Logging features + ([SEP-2577](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2577)). + These features remain fully functional during the deprecation window but new + implementations should not add support for them. Suggested migrations: pass + directories or files via tool parameters, resource URIs, or server + configuration instead of Roots; integrate directly with LLM provider APIs + instead of Sampling; log to `stderr` (stdio) or use OpenTelemetry instead of + Logging. + +2. Reclassify the HTTP+SSE transport (deprecated since protocol version + `2025-03-26`) as Deprecated under the feature lifecycle policy + ([SEP-2596](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2596)). + Migrate to [Streamable HTTP](/specification/2026-07-28/basic/transports/streamable-http). + +3. Reclassify the `includeContext` values `"thisServer"` and `"allServers"` + (soft-deprecated since protocol version `2025-11-25`) as Deprecated + ([SEP-2596](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2596)). + Omit the field or use `"none"`; these values will be removed no later than + the Sampling feature itself. + +4. Deprecate the OAuth 2.0 Dynamic Client Registration Protocol + ([RFC7591](https://datatracker.ietf.org/doc/html/rfc7591)) as a client registration + mechanism in favor of + [Client ID Metadata Documents](/specification/2026-07-28/basic/authorization/client-registration#client-id-metadata-documents) + ([PR #2858](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2858)). + It remains available for backwards compatibility with authorization servers that do + not support Client ID Metadata Documents. + +## Other schema changes + +1. `schema.json` now correctly reflects that the Typescript definition of minimum/maximum/default are `number`'s and not just `integers`. This was caused by running the generator using `--defaultNumberType integer` ([PR#2710](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2710)). + +## Governance and process updates + +1. Adopt a specification + [feature lifecycle and deprecation policy](/community/feature-lifecycle) + defining the Active, Deprecated, and Removed feature states, a minimum + twelve-month deprecation window, and a + [registry of deprecated features](/specification/2026-07-28/deprecated) + ([SEP-2596](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2596)). + +## Process changes + +1. Formalize PR-based SEP workflow with markdown files in `seps/` directory, PR-derived numbering, sponsor responsibilities, and status management via PR labels ([SEP-1850](https://github.com/modelcontextprotocol/specification/pull/1850)). + +## Full changelog + +For a complete list of all changes that have been made since the last protocol revision, +[see GitHub](https://github.com/modelcontextprotocol/specification/compare/2025-11-25...2026-07-28). diff --git a/slices/001b-ping-guard/logs/spec-legacy-basic.md b/slices/001b-ping-guard/logs/spec-legacy-basic.md new file mode 100644 index 0000000..6e62914 --- /dev/null +++ b/slices/001b-ping-guard/logs/spec-legacy-basic.md @@ -0,0 +1,269 @@ +> ## Documentation Index +> Fetch the complete documentation index at: https://modelcontextprotocol.io/llms.txt +> Use this file to discover all available pages before exploring further. + +# Overview + +
+ +The Model Context Protocol consists of several key components that work together: + +* **Base Protocol**: Core JSON-RPC message types +* **Lifecycle Management**: Connection initialization, capability negotiation, and + session control +* **Authorization**: Authentication and authorization framework for HTTP-based transports +* **Server Features**: Resources, prompts, and tools exposed by servers +* **Client Features**: Sampling and root directory lists provided by clients +* **Utilities**: Cross-cutting concerns like logging and argument completion + +All implementations **MUST** support the base protocol and lifecycle management +components. Other components **MAY** be implemented based on the specific needs of the +application. + +These protocol layers establish clear separation of concerns while enabling rich +interactions between clients and servers. The modular design allows implementations to +support exactly the features they need. + +## Messages + +All messages between MCP clients and servers **MUST** follow the +[JSON-RPC 2.0](https://www.jsonrpc.org/specification) specification. The protocol defines +these types of messages: + +### Requests + +[Requests](/specification/2025-11-25/schema#jsonrpcrequest) are sent from the client to the server or vice versa, to initiate an operation. + +```typescript theme={null} +{ + jsonrpc: "2.0"; + id: string | number; + method: string; + params?: { + [key: string]: unknown; + }; +} +``` + +* Requests **MUST** include a string or integer ID. +* Unlike base JSON-RPC, the ID **MUST NOT** be `null`. +* The request ID **MUST NOT** have been previously used by the requestor within the same + session. + +### Responses + +Responses are sent in reply to requests, containing either the result or error of the operation. + +#### Result Responses + +[Result responses](/specification/2025-11-25/schema#jsonrpcresultresponse) are sent when the operation completes successfully. + +```typescript theme={null} +{ + jsonrpc: "2.0"; + id: string | number; + result: { + [key: string]: unknown; + } +} +``` + +* Result responses **MUST** include the same ID as the request they correspond to. +* Result responses **MUST** include a `result` field. +* The `result` **MAY** follow any JSON object structure. + +#### Error Responses + +[Error responses](/specification/2025-11-25/schema#jsonrpcerrorresponse) are sent when the operation fails or encounters an error. + +```typescript theme={null} +{ + jsonrpc: "2.0"; + id?: string | number; + error: { + code: number; + message: string; + data?: unknown; + } +} +``` + +* Error responses **MUST** include the same ID as the request they correspond to (except in error cases where the ID could not be read due a malformed request). +* Error responses **MUST** include an `error` field with a `code` and `message`. +* Error codes **MUST** be integers. + +### Notifications + +[Notifications](/specification/2025-11-25/schema#jsonrpcnotification) are sent from the client to the server or vice versa, as a one-way message. +The receiver **MUST NOT** send a response. + +```typescript theme={null} +{ + jsonrpc: "2.0"; + method: string; + params?: { + [key: string]: unknown; + }; +} +``` + +* Notifications **MUST NOT** include an ID. + +## Auth + +MCP provides an [Authorization](/specification/2025-11-25/basic/authorization) framework for use with HTTP. +Implementations using an HTTP-based transport **SHOULD** conform to this specification, +whereas implementations using STDIO transport **SHOULD NOT** follow this specification, +and instead retrieve credentials from the environment. + +Additionally, clients and servers **MAY** negotiate their own custom authentication and +authorization strategies. + +For further discussions and contributions to the evolution of MCP's auth mechanisms, join +us in +[GitHub Discussions](https://github.com/modelcontextprotocol/specification/discussions) +to help shape the future of the protocol! + +## Schema + +The full specification of the protocol is defined as a +[TypeScript schema](https://github.com/modelcontextprotocol/specification/blob/main/schema/2025-11-25/schema.ts). +This is the source of truth for all protocol messages and structures. + +There is also a +[JSON Schema](https://github.com/modelcontextprotocol/specification/blob/main/schema/2025-11-25/schema.json), +which is automatically generated from the TypeScript source of truth, for use with +various automated tooling. + +## JSON Schema Usage + +The Model Context Protocol uses JSON Schema for validation throughout the protocol. This section clarifies how JSON Schema should be used within MCP messages. + +### Schema Dialect + +MCP supports JSON Schema with the following rules: + +1. **Default dialect**: When a schema does not include a `$schema` field, it defaults to [JSON Schema 2020-12](https://json-schema.org/draft/2020-12/schema) +2. **Explicit dialect**: Schemas MAY include a `$schema` field to specify a different dialect +3. **Supported dialects**: Implementations MUST support at least 2020-12 and SHOULD document which additional dialects they support +4. **Recommendation**: Implementors are RECOMMENDED to use JSON Schema 2020-12. + +### Example Usage + +#### Default dialect (2020-12): + +```json theme={null} +{ + "type": "object", + "properties": { + "name": { "type": "string" }, + "age": { "type": "integer", "minimum": 0 } + }, + "required": ["name"] +} +``` + +#### Explicit dialect (draft-07): + +```json theme={null} +{ + "$schema": "http://json-schema.org/draft-07/schema#", + "type": "object", + "properties": { + "name": { "type": "string" }, + "age": { "type": "integer", "minimum": 0 } + }, + "required": ["name"] +} +``` + +### Implementation Requirements + +* Clients and servers **MUST** support JSON Schema 2020-12 for schemas without an explicit `$schema` field +* Clients and servers **MUST** validate schemas according to their declared or default dialect. They **MUST** handle unsupported dialects gracefully by returning an appropriate error indicating the dialect is not supported. +* Clients and servers **SHOULD** document which schema dialects they support + +### Schema Validation + +* Schemas **MUST** be valid according to their declared or default dialect + +## General fields + +### `_meta` + +The `_meta` property/parameter is reserved by MCP to allow clients and servers +to attach additional metadata to their interactions. + +Certain key names are reserved by MCP for protocol-level metadata, as specified below; +implementations MUST NOT make assumptions about values at these keys. + +Additionally, definitions in the [schema](https://github.com/modelcontextprotocol/specification/blob/main/schema/2025-11-25/schema.ts) +may reserve particular names for purpose-specific metadata, as declared in those definitions. + +**Key name format:** valid `_meta` key names have two segments: an optional **prefix**, and a **name**. + +**Prefix:** + +* If specified, MUST be a series of labels separated by dots (`.`), followed by a slash (`/`). + * Labels MUST start with a letter and end with a letter or digit; interior characters can be letters, digits, or hyphens (`-`). + * Implementations SHOULD use reverse DNS notation (e.g., `com.example/` rather than `example.com/`). +* Any prefix where the second label is `modelcontextprotocol` or `mcp` is **reserved** for MCP use. + * For example: `io.modelcontextprotocol/`, `dev.mcp/`, `org.modelcontextprotocol.api/`, and `com.mcp.tools/` are all reserved. + * However, `com.example.mcp/` is NOT reserved, as the second label is `example`. + +**Name:** + +* Unless empty, MUST begin and end with an alphanumeric character (`[a-z0-9A-Z]`). +* MAY contain hyphens (`-`), underscores (`_`), dots (`.`), and alphanumerics in between. + +### `icons` + +The `icons` property provides a standardized way for servers to expose visual identifiers for their resources, tools, prompts, and implementations. Icons enhance user interfaces by providing visual context and improving the discoverability of available functionality. + +Icons are represented as an array of `Icon` objects, where each icon includes: + +* `src`: A URI pointing to the icon resource (required). This can be: + * An HTTP/HTTPS URL pointing to an image file + * A data URI with base64-encoded image data +* `mimeType`: Optional MIME type if the server's type is missing or generic +* `sizes`: Optional array of size specifications (e.g., `["48x48"]`, `["any"]` for scalable formats like SVG, or `["48x48", "96x96"]` for multiple sizes) +* `theme`: Optional theme preference (`light` or `dark`) for the icon background + +**Required MIME type support:** + +Clients that support rendering icons **MUST** support at least the following MIME types: + +* `image/png` - PNG images (safe, universal compatibility) +* `image/jpeg` (and `image/jpg`) - JPEG images (safe, universal compatibility) + +Clients that support rendering icons **SHOULD** also support: + +* `image/svg+xml` - SVG images (scalable but requires security precautions as noted below) +* `image/webp` - WebP images (modern, efficient format) + +**Security considerations:** + +Consumers of icon metadata **MUST** take appropriate security precautions when handling icons to prevent compromise: + +* Treat icon metadata and icon bytes as untrusted inputs and defend against network, privacy, and parsing risks. +* Ensure that the icon URI is either a HTTPS or `data:` URI. Clients **MUST** reject icon URIs that use unsafe schemes and redirects, such as `javascript:`, `file:`, `ftp:`, `ws:`, or local app URI schemes. + * Disallow scheme changes and redirects to hosts on different origins. +* Be resilient against resource exhaustion attacks stemming from oversized images, large dimensions, or excessive frames (e.g., in GIFs). + * Consumers **MAY** set limits for image and content size. +* Fetch icons without credentials. Do not send cookies, `Authorization` headers, or client credentials. +* Verify that icon URIs are from the same origin as the server. This minimizes the risk of exposing data or tracking information to third-parties. +* Exercise caution when fetching and rendering icons as the payload **MAY** contain executable content (e.g., SVG with [embedded JavaScript](https://www.w3.org/TR/SVG11/script.html) or [extended capabilities](https://www.w3.org/TR/SVG11/extend.html)). + * Consumers **MAY** choose to disallow specific file types or otherwise sanitize icon files before rendering. +* Validate MIME types and file contents before rendering. Treat the MIME type information as advisory. Detect content type via magic bytes; reject on mismatch or unknown types. + * Maintain a strict allowlist of image types. + +**Usage:** + +Icons can be attached to: + +* `Implementation`: Visual identifier for the MCP server/client implementation +* `Tool`: Visual representation of the tool's functionality +* `Prompt`: Icon to display alongside prompt templates +* `Resource`: Visual indicator for different resource types + +Multiple icons can be provided to support different display contexts and resolutions. Clients should select the most appropriate icon based on their UI requirements. diff --git a/test/beam_mcp/negotiation_test.exs b/test/beam_mcp/negotiation_test.exs index 83906b8..5aa6992 100644 --- a/test/beam_mcp/negotiation_test.exs +++ b/test/beam_mcp/negotiation_test.exs @@ -42,6 +42,11 @@ defmodule BeamMCP.NegotiationTest do defp send_msg(msg), do: state() |> Server.handle_message(msg) |> elem(1) + # send_msg/1 throws the state away, so nothing it drives can catch a branch that returns + # the wrong state. shutdown is the only request method that changes state and it reaches + # both era branches, so it is the input that covers them. + defp send_for_state(msg), do: state() |> Server.handle_message(msg) |> elem(0) + defp modern(method, extra \\ %{}) do Map.merge( %{ @@ -57,6 +62,21 @@ defmodule BeamMCP.NegotiationTest do ) end + # The same modern carrier, declaring the legacy revision. The specification's own retry + # advice on -32022 produces exactly this message: pick from `supported` and retry the + # request. `supported` here is ["2026-07-28", "2025-11-25"]. + defp legacy_meta(method, extra \\ %{}) do + Map.merge( + %{ + "jsonrpc" => "2.0", + "id" => 1, + "method" => method, + "_meta" => %{"io.modelcontextprotocol/protocolVersion" => @legacy} + }, + extra + ) + end + describe "server/discover — mandatory in 2026-07-28" do test "it exists and advertises the supported versions, capabilities and identity" do r = send_msg(%{"jsonrpc" => "2.0", "id" => 1, "method" => "server/discover"}) @@ -148,6 +168,57 @@ defmodule BeamMCP.NegotiationTest do assert r["error"]["code"] == -32_601, "ping was removed in 2026-07-28; the legacy handler must not inherit it" end + + test "a ping declaring 2025-11-25 through _meta is answered" do + r = send_msg(legacy_meta("ping")) + + assert r["result"] == %{}, + "ping exists in 2025-11-25. This server advertises 2025-11-25 in " <> + "server/discover and lists it in the -32022 `supported` payload, and the " <> + "specification tells a client to pick from that list and retry the request " <> + "— which produces this message. Refusing it refuses a revision we advertise." + end + end + + describe "state threads through both era branches" do + test "shutdown declaring 2025-11-25 through _meta still sets shutdown?" do + assert Server.shutdown?(send_for_state(legacy_meta("shutdown"))), + "the legacy branch returns the recursion's tuple whole; if it returned the " <> + "pre-recursion state instead, the transport would never stop" + end + + test "shutdown declaring 2026-07-28 through _meta still sets shutdown?" do + assert Server.shutdown?(send_for_state(modern("shutdown"))) + end + + test "a ping at either revision leaves the state alone" do + refute Server.shutdown?(send_for_state(legacy_meta("ping"))) + refute Server.shutdown?(send_for_state(modern("ping"))) + end + end + + describe "the result envelope follows the declared revision, not the carrier" do + test "a 2026-07-28 result carries resultType and serverInfo _meta" do + r = send_msg(modern("tools/list")) + + assert r["result"]["resultType"] == "complete" + assert r["result"]["_meta"]["io.modelcontextprotocol/serverInfo"] + end + + test "a result for a request declaring 2025-11-25 carries neither" do + r = send_msg(legacy_meta("tools/list")) + + assert r["result"]["tools"], "the request is still served" + + refute r["result"]["resultType"], + "resultType was added in 2026-07-28; the spec says clients MUST treat results " <> + "from earlier-protocol servers that omit it as \"complete\", so emitting it " <> + "on a 2025-11-25 result claims a revision the client did not ask for" + + refute r["result"]["_meta"], + "the serverInfo _meta key is a 2026-07-28 addition and does not belong on a " <> + "result answering a request that declared 2025-11-25" + end end describe "JSON-RPC batching — required in exactly one revision, and not ours" do diff --git a/tools/archive_sweep.sh b/tools/archive_sweep.sh new file mode 100755 index 0000000..389de35 --- /dev/null +++ b/tools/archive_sweep.sh @@ -0,0 +1,198 @@ +#!/usr/bin/env bash +# SPDX-FileCopyrightText: 2026 Sudo Apt Holdings LLC +# SPDX-License-Identifier: Apache-2.0 +# +# Classify every file the slice record labels an archive: is it its command's bytes, or not? +# +# Written because fixing one archive per round met the next one three rounds running. A list is +# not a population. This derives the population and SHOWS each comparison -- including the +# normalisation it applies -- because a sweep whose whole point is "do not trust a claim, diff +# the bytes" must not assert its own verdicts in an echo. That was r2's round-4 finding 3 +# against the first version of this script, and it was right. +# +# ./tools/archive_sweep.sh > slices/001b-ping-guard/logs/archive-sweep.txt 2>&1 +set -uo pipefail +cd "$(git rev-parse --show-toplevel)" || exit 1 +L=slices/001b-ping-guard/logs +W=$(mktemp -d); trap 'rm -rf "$W"' EXIT + +# Seed and timings differ on every ExUnit run; normalise ONLY those, and say so at each use. +# Normalise ONLY what varies between runs of the same command on the same bytes: +# - the ExUnit seed and the timings, which change every run; +# - the compile prologue, which depends on whether _build was warm and which no archive +# contains. r1 ran this script on a cold build and got a false DIFFERS on full-suite.txt +# (round 5). The build is warmed below as well; this makes the comparison independent of +# build state rather than merely usually-right, so the header's command reproduces the +# tracked output on a clean checkout. +# Nothing else is touched -- in particular nothing inside a failure block. +norm() { + sed -E 's/seed: [0-9]+/seed: N/; s/in [0-9.]+ seconds/in T seconds/; s/\([0-9.]+s async, [0-9.]+s sync\)/(T async, T sync)/' "$1" \ + | grep -Ev '^(==> |Compiling [0-9]+ file|Generated .* app)' +} + +# Two notes, not one. The first version took a single note and printed it on both branches, +# so a failing line read "DIFFERS (empty diff above = identical)" -- a parenthetical asserting +# a result the run had just contradicted. A printed claim the run did not compute is the exact +# defect this instrument exists to catch, and it was inside the instrument (r2 round-5, 2a). +CLASSIFIED=0 +verdict() { # verdict + CLASSIFIED=$((CLASSIFIED + 1)) + if [ "$2" -eq 0 ]; then printf ' => %-24s RAW %s\n' "$1" "$3" + else printf ' => %-24s DIFFERS %s\n' "$1" "${4:-see the diff above}"; fi +} + +# An empty diff and a diff that never ran are indistinguishable on the page. So report the +# comparison POSITIVELY -- the differing-line count and the exit code -- rather than printing +# nothing and calling it agreement. A check that did not execute cannot then render as a pass. +showdiff() { # showdiff -> returns diff's rc + local out rc + out=$(diff "$1" "$2"); rc=$? + printf ' comparison: %s differing line(s), diff exit=%s\n' "$(printf '%s' "$out" | grep -c '^[<>]')" "$rc" + [ -n "$out" ] && printf '%s\n' "$out" | sed 's/^/ /' + return $rc +} + +# The marks a filtered capture cannot have. Used for logs that cannot be re-run here. +marks() { # marks -> prints counts, returns 0 if all four present + local f="$1" banner stack code fin + banner=$(grep -c 'Running ExUnit with seed' "$f"); stack=$(grep -c 'stacktrace:' "$f") + code=$(grep -c 'code:' "$f"); fin=$(grep -c 'Finished in' "$f") + printf ' seed banner : %s\n stacktrace: : %s\n code: : %s\n Finished in : %s\n' \ + "$banner" "$stack" "$code" "$fin" + printf ' tests, line : %s\n' "$(grep 'tests,' "$f")" + # ALL FOUR are enforced, not merely printed. The first version tested only two, so a log + # stripped of its ExUnit banner -- instance #2 exactly -- still scored RAW (r2 round-5, 3). + [ "$banner" -ge 1 ] && [ "$stack" -ge 1 ] && [ "$code" -ge 1 ] && [ "$fin" -ge 1 ] +} + +echo "=== POPULATION, derived from the tracked set rather than listed ===" +git ls-files -- "$L/*" | sed 's/^/ /' +echo +echo "Two kinds of file live here, and only one kind can be diffed against a command:" +echo " CAPTURES - a command wrote them; re-run the command and compare bytes." +echo " Includes the spec-*.md files: 'curl -o' IS the command and the" +echo " upstream page IS the source, so they are checkable, not prose." +echo " AUTHORED - the round*.md lane reports. Each was written by the reviewer that" +echo " is its source. Nothing to re-run; they must simply never be" +echo " labelled the output of a command." +echo +# Warm the build BEFORE any comparison, and say so. Without this the first `mix test` hits a +# cold _build and emits "Compiling N files (.ex)" lines that norm() does not touch, scoring a +# false DIFFERS that depends only on the machine the sweep ran on. The first version passed +# purely because gate.sh happened to run --force earlier in the file: the ordering was +# load-bearing and undocumented (r2 round-5, 2b). +echo "=== warming the build so comparisons do not depend on _build state ===" +echo " \$ mix compile --force ; mix test --exclude all (output discarded; only the" +echo " build state matters here, and a cold build emits compile lines no archive contains)" +mix compile --force > /dev/null 2>&1 +mix test --exclude test > /dev/null 2>&1 +echo + +echo "=== CAPTURES: test and gate logs ===" +echo "-- full-suite.txt: diff vs a fresh 'mix test', seed+timing normalised on BOTH sides --" +mix test > "$W/full.out" 2>&1 +showdiff <(norm "$W/full.out") <(norm "$L/full-suite.txt"); rc=$? +verdict full-suite.txt $rc "(0 differing lines above; seed/timing/compile normalised)" "(the diff above is the difference)" +echo +echo "-- green-negotiation.txt: same command, same normalisation --" +mix test test/beam_mcp/negotiation_test.exs > "$W/green.out" 2>&1 +showdiff <(norm "$W/green.out") <(norm "$L/green-negotiation.txt"); rc=$? +verdict green-negotiation.txt $rc "(0 differing lines above)" "(the diff above is the difference)" +echo +echo "-- gate.txt: no normalisation, the gate emits nothing variable --" +./tools/gate.sh > "$W/gate.out" 2>&1 +showdiff "$W/gate.out" "$L/gate.txt"; rc=$? +verdict gate.txt $rc "(0 differing lines above; no normalisation applied)" "(the diff above is the difference)" +echo +echo "=== CAPTURES: the probe ===" +echo "-- probe-after.txt vs a WARM fresh run of the tracked probe, no normalisation --" +mix run tools/probe_ping.exs > "$W/probe.out" 2>&1 +showdiff "$W/probe.out" "$L/probe-after.txt"; rc=$? +verdict probe-after.txt $rc "(byte-identical to a warm run)" "(the diff above is the difference)" +echo " NOTE, and the direction matters: against a COLD _build the same command emits extra" +echo " dependency-compile lines, so the archive would have FEWER lines than that run." +echo " Fewer-lines-than-the-run is the SIGNATURE OF FILTERING -- it is exactly what was" +echo " found in instances #2 and #3 -- so it is never on its own an acquittal. What" +echo " acquits this file is the byte-identical match against a warm run above." +echo +echo "=== CAPTURES: red.txt, the red half of red-before-green ===" +echo " RESTORED in round 6. The round-4 sweep classified this file; the round-5 rewrite" +echo " enumerated it and classified it nowhere, so a reader scanning for DIFFERS got a clean" +echo " bill over a population the instrument had not finished. An unclassified file is not a" +echo " RAW file. That is CONVENTIONS.md's 'proves nothing, and proves it quietly' shape, and" +echo " it is the coverage regression r2 blocked round 5 on -- inside the round that promised" +echo " the population." +echo " Not re-runnable here: it is the failing state BEFORE the fix, and lib/ is now fixed." +echo " Reproducing it needs lib/beam_mcp/server.ex reverted to base/main, which this script" +echo " must not do to the working tree. Checked instead for the marks a filtered capture" +echo " cannot have:" +if marks "$L/red.txt"; then + verdict red.txt 0 "(banner + code: + stacktrace: + Finished in, all present)" "" +else + verdict red.txt 1 "" "(a mark is missing; a filtered capture would look like this)" +fi +echo + +echo "=== CAPTURES: the two mutation logs ===" +for m in a b; do + f="$L/mutation-$m.txt" + echo "-- mutation-$m.txt --" + echo " not re-run here: reproducing it needs a mutated copy of lib/, which this script" + echo " must not create in the working tree. Checked instead for the marks a filtered" + echo " capture cannot have -- the ExUnit banner and a complete failure body:" + if marks "$f"; then + verdict "mutation-$m.txt" 0 "(banner + code: + stacktrace: + Finished in, all present)" "" + else + verdict "mutation-$m.txt" 1 "" "(a mark is missing; a filtered capture would look like this)" + fi +done +echo +echo "=== CAPTURES: the three specification pages, re-fetched and diffed against upstream ===" +echo "These are the only files whose source lives OUTSIDE the tree, so they are the only" +echo "ones a diff can check against an independent authority. Grouping them with prose" +echo "(the first version of this script did) is what would excuse never checking them." +fetch_check() { # fetch_check + if curl -sSL --fail "$2" -o "$W/$(basename $1)" 2>/dev/null; then + showdiff "$W/$(basename $1)" "$1"; rc=$? + verdict "$(basename $1)" $rc "(re-fetched from $2)" + else + printf ' => %-24s UNCHECKED (fetch failed; offline)\n' "$(basename $1)" + fi +} +fetch_check "$L/spec-basic-versioning.md" "https://modelcontextprotocol.io/specification/2026-07-28/basic/versioning.md" +fetch_check "$L/spec-changelog.md" "https://modelcontextprotocol.io/specification/2026-07-28/changelog.md" +fetch_check "$L/spec-legacy-basic.md" "https://modelcontextprotocol.io/specification/2025-11-25/basic.md" +echo +echo "=== AUTHORED: the lane reports ===" +for f in $(git ls-files -- "$L/round*.md"); do + printf ' %-28s written by its own reviewer lane; not a command capture\n' "$(basename $f)" +done +echo +echo "=== archive-sweep.txt itself ===" +echo " A file cannot diff itself while being written, so this entry NAMES ITS CHECK rather" +echo " than asserting a conclusion -- the thing this script's own header forbids:" +printf ' script sha256 : %s\n' "$(sha256sum tools/archive_sweep.sh | cut -d" " -f1)" +printf ' reproduce : ./tools/archive_sweep.sh > %s 2>&1\n' "$L/archive-sweep.txt" +echo " then diff that against the tracked file. A reader who doubts any verdict above" +echo " re-runs that one line; the script is tracked, so the bytes that produced this" +echo " output are in the tree next to it." +verdict archive-sweep.txt 0 "(self: named check above, not an assertion)" "" +echo + +echo "=== CLOSING TALLY -- the structural fix, not an instance fix ===" +echo " Round 5 enumerated red.txt and classified it nowhere: 19 listed, 18 classified, and" +echo " the output still read as a clean sweep because nothing counted. A file could drop out" +echo " QUIETLY -- CONVENTIONS.md's own worst shape, and this script's header says a list is" +echo " not a population. So the population and the classifications are now counted and" +echo " compared, and disagreement is a FAILURE of this script rather than a silent gap." +ENUM=$(git ls-files -- "$L/*" | wc -l) +AUTH=$(git ls-files -- "$L/round*.md" | wc -l) +printf ' enumerated : %s\n classified : %s (%s verdicts + %s authored lane reports)\n' \ + "$ENUM" "$((CLASSIFIED + AUTH))" "$CLASSIFIED" "$AUTH" +if [ "$ENUM" -eq "$((CLASSIFIED + AUTH))" ]; then + echo " => TALLY BALANCES: every enumerated file is classified." +else + echo " => TALLY FAILS: $((ENUM - CLASSIFIED - AUTH)) enumerated file(s) unclassified." + echo " Unclassified is NOT the same as RAW. Do not read this sweep as clean." + exit 1 +fi diff --git a/tools/probe_ping.exs b/tools/probe_ping.exs new file mode 100644 index 0000000..89b0497 --- /dev/null +++ b/tools/probe_ping.exs @@ -0,0 +1,70 @@ +# SPDX-FileCopyrightText: 2026 Sudo Apt Holdings LLC +# SPDX-License-Identifier: Apache-2.0 +# +# The era probe used to measure this slice. Tracked so that logs/probe-after.txt is +# regenerable by anyone with the tree, like the other run-logs -- r1 round-3 finding 6. +# +# mix run tools/probe_ping.exs > slices/001b-ping-guard/logs/probe-after.txt 2>&1 + +defmodule ProbeCatalog do + @behaviour BeamMCP.ToolCatalog + @impl true + def all do + [ + %BeamMCP.ToolSpec{ + name: :echo, + command_class: :observe, + mode: :read_only, + description: "Echo." + } + ] + end +end + +state = BeamMCP.Server.new(tool_catalog: ProbeCatalog, dispatch: fn _n, a, _o -> {:ok, a} end) +key = "io.modelcontextprotocol/protocolVersion" + +send_one = fn label, msg -> + {_s, r} = BeamMCP.Server.handle_message(state, msg) + IO.puts("#{label}\n -> #{Jason.encode!(r)}") +end + +IO.puts("beam_mcp version: #{Mix.Project.config()[:version]}") +IO.puts("") + +send_one.("ping + _meta 2026-07-28", %{ + "jsonrpc" => "2.0", + "id" => 1, + "method" => "ping", + "_meta" => %{key => "2026-07-28"} +}) + +send_one.("ping + _meta 2025-11-25", %{ + "jsonrpc" => "2.0", + "id" => 1, + "method" => "ping", + "_meta" => %{key => "2025-11-25"} +}) + +send_one.("ping + _meta, no version key", %{ + "jsonrpc" => "2.0", + "id" => 1, + "method" => "ping", + "_meta" => %{"other" => 1} +}) + +send_one.("ping bare", %{"jsonrpc" => "2.0", "id" => 1, "method" => "ping"}) + +send_one.("tools/list + _meta 2025-11-25", %{ + "jsonrpc" => "2.0", + "id" => 2, + "method" => "tools/list", + "_meta" => %{key => "2025-11-25"} +}) + +send_one.("tools/list + _meta 2026-07-28", %{ + "jsonrpc" => "2.0", + "id" => 2, + "method" => "tools/list", + "_meta" => %{key => "2026-07-28"} +})