diff --git a/.claude-plugin/marketplace.json b/.claude-plugin/marketplace.json
index 418bf3d..011ac28 100644
--- a/.claude-plugin/marketplace.json
+++ b/.claude-plugin/marketplace.json
@@ -9,9 +9,9 @@
     {
       "name": "pmndrs",
       "source": "./",
-      "description": "Answers questions about react-three-fiber, drei and zustand from the official docs.pmnd.rs pages instead of from memory.",
+      "description": "Poimandres tooling for Claude Code. Currently: answers questions about react-three-fiber, drei and zustand from the official docs.pmnd.rs pages instead of from memory.",
       "category": "documentation",
-      "tags": ["react-three-fiber", "drei", "zustand", "three.js"]
+      "tags": ["pmndrs", "poimandres", "react-three-fiber", "drei", "zustand", "three.js"]
     }
   ]
 }
diff --git a/.claude-plugin/plugin.json b/.claude-plugin/plugin.json
index b05943c..ba782f5 100644
--- a/.claude-plugin/plugin.json
+++ b/.claude-plugin/plugin.json
@@ -1,6 +1,6 @@
 {
   "name": "pmndrs",
-  "description": "Answers questions about react-three-fiber, drei and zustand from the official docs.pmnd.rs pages instead of from memory.",
+  "description": "Poimandres tooling for Claude Code. Currently: answers questions about react-three-fiber, drei and zustand from the official docs.pmnd.rs pages instead of from memory.",
   "version": "0.1.0",
   "author": {
     "name": "Poimandres",
@@ -10,6 +10,8 @@
   "repository": "https://github.com/pmndrs/claude-code-plugin",
   "license": "MIT",
   "keywords": [
+    "pmndrs",
+    "poimandres",
     "react-three-fiber",
     "drei",
     "zustand",
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..2a75609
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,16 @@
+name: test
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+      - run: npm test
diff --git a/README.md b/README.md
index d70cf49..cfa299a 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,14 @@
 # pmndrs — a Claude Code plugin
 
-Makes Claude read the [pmndrs docs](https://docs.pmnd.rs) before answering
-questions about **react-three-fiber**, **drei** and **zustand**, instead of
-recalling an API that may have moved.
+The Poimandres plugin for Claude Code: one install that carries whatever makes
+Claude work well on a pmndrs codebase.
+
+That is a shape, not a promise. Today it does one thing — it makes Claude read
+the [pmndrs docs](https://docs.pmnd.rs) before answering questions about
+**react-three-fiber**, **drei** and **zustand**, instead of recalling an API
+that may have moved. What lands next is whatever earns its place: more skills,
+subagents, hooks. They land here rather than in a plugin each, so that adopting
+Poimandres tooling stays one install and one thing to keep current.
 
 ## Install
 
@@ -17,7 +23,7 @@ Or from inside a session: `/plugin marketplace add pmndrs/claude-code-plugin`, t
 The plugin bundles an MCP server, so Claude Code asks you to approve it on
 first use. It is the public docs.pmnd.rs endpoint — no auth, no credentials.
 
-## Use
+## Documentation lookup
 
 Nothing to invoke. Ask normally:
 
@@ -26,27 +32,47 @@ Nothing to invoke. Ask normally:
 and Claude reads the docs index, fetches the page, and answers with a link.
 `/pmndrs:docs` runs the same lookup on demand.
 
+The docs server advertises eleven libraries but only serves four —
+react-three-fiber, drei, zustand, and the pmndrs/docs site itself. The other
+seven (a11y, react-postprocessing, uikit, xr, prai, viverse, leva) publish no
+`llms-full.txt` upstream, so the skill tells Claude to say so rather than
+retry. Widen it the day those dumps appear.
+
 ## What's inside
 
-| File | |
+Components, which is what grows:
+
+| | |
 |---|---|
-| `.mcp.json` | the `docs` MCP server → `https://docs.pmnd.rs/api/mcp` |
 | `skills/docs/SKILL.md` | when to look things up, and how — index resource first, then `get_page_content` |
+
+And the plumbing, which mostly doesn't:
+
+| | |
+|---|---|
+| `.mcp.json` | the `docs` MCP server → `https://docs.pmnd.rs/api/mcp` |
 | `.claude-plugin/plugin.json` | the plugin manifest |
 | `.claude-plugin/marketplace.json` | lets this repo be added as a marketplace |
-
-The docs server advertises eleven libraries but only serves four —
-react-three-fiber, drei, zustand, and the pmndrs/docs site itself. The other
-seven (a11y, react-postprocessing, uikit, xr, prai, viverse, leva) publish no
-`llms-full.txt` upstream, so the skill tells Claude to say so rather than
-retry. Widen it the day those dumps appear.
+| `test/` | checks the components are wired to the manifests |
 
 ## Develop
 
 ```bash
 claude --plugin-dir .        # load this checkout directly
 claude plugin validate .     # check the manifests
+npm test                     # check the components (no dependencies)
 ```
 
 `/reload-plugins` picks up edits without restarting; `SKILL.md` changes apply
 immediately.
+
+`npm test` runs Node's built-in test runner over `test/` — no install step. It
+checks the things that fail silently at runtime rather than loudly at load: that
+a component addressing a bundled MCP server uses the scoped name it registers
+under once installed, that the plugin name still matches between the two
+manifests it is derived from, that no server is declared and then used by
+nothing, and that this README lists every component shipped.
+
+That last one is the rule to keep as components accumulate: a capability nobody
+can find is a capability nobody uses, so the README table is enforced rather
+than maintained by good intentions.
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..626fe35
--- /dev/null
+++ b/package.json
@@ -0,0 +1,10 @@
+{
+  "name": "@pmndrs/claude-code-plugin",
+  "private": true,
+  "type": "module",
+  "description": "Tests for the pmndrs Claude Code plugin. The plugin itself is plain markdown and JSON — nothing here is published or installed.",
+  "license": "MIT",
+  "scripts": {
+    "test": "node --test \"test/*.test.mjs\""
+  }
+}
diff --git a/skills/docs/SKILL.md b/skills/docs/SKILL.md
index c7ed8d2..a0a96ea 100644
--- a/skills/docs/SKILL.md
+++ b/skills/docs/SKILL.md
@@ -16,7 +16,9 @@ indexes as MCP *resources* and one tool, `get_page_content(lib, path)`.
 
 1. **Read the index resource** for the library: `docs://<lib>/index`, via
    `ReadMcpResourceTool`. It returns one `<path> - <title>` line per page.
-   If the server name is ambiguous, `ListMcpResourcesTool` shows which server
+   Installed as a plugin, the server registers under the scoped name
+   `plugin:pmndrs:docs` rather than the bare key `docs` — pass that as `server`.
+   `ListMcpResourcesTool` with no argument shows the live name and which server
    serves the `docs://` URIs.
 2. **Fetch the page** with this plugin's `get_page_content`, passing a `path`
    copied verbatim from that index and the same `lib`.
diff --git a/test/cli.test.mjs b/test/cli.test.mjs
new file mode 100644
index 0000000..ea29687
--- /dev/null
+++ b/test/cli.test.mjs
@@ -0,0 +1,14 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+import { spawnSync } from 'node:child_process'
+import { root } from './helpers.mjs'
+
+const claude = spawnSync('claude', ['--version'], { encoding: 'utf8' })
+const available = claude.status === 0
+
+test('claude plugin validate accepts this checkout', { skip: available ? false : 'claude CLI not installed' }, () => {
+  const result = spawnSync('claude', ['plugin', 'validate', '.'], { cwd: root, encoding: 'utf8' })
+  const output = `${result.stdout}${result.stderr}`
+  assert.equal(result.status, 0, output)
+  assert.doesNotMatch(output, /\berror\b/i, output)
+})
diff --git a/test/helpers.mjs b/test/helpers.mjs
new file mode 100644
index 0000000..a3a0da0
--- /dev/null
+++ b/test/helpers.mjs
@@ -0,0 +1,70 @@
+import { readFileSync, readdirSync, existsSync } from 'node:fs'
+import { join, dirname } from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+export const root = join(dirname(fileURLToPath(import.meta.url)), '..')
+
+export const readJson = (...p) => JSON.parse(readFileSync(join(root, ...p), 'utf8'))
+
+/**
+ * Minimal YAML front matter reader — enough for the subset Claude Code agent and
+ * skill files use: `key: value`, block lists, and inline `[a, b]` lists. Values
+ * are returned as strings or arrays of strings, never coerced.
+ */
+export function frontMatter(source) {
+  const match = /^---\r?\n([\s\S]*?)\r?\n---\r?\n?/.exec(source)
+  if (!match) throw new Error('no front matter block')
+
+  const fields = {}
+  let key = null
+
+  for (const line of match[1].split(/\r?\n/)) {
+    if (!line.trim() || line.trimStart().startsWith('#')) continue
+
+    const item = /^\s*-\s+(.*)$/.exec(line)
+    if (item) {
+      if (!key) throw new Error(`list item outside a key: ${line}`)
+      fields[key] = [...(Array.isArray(fields[key]) ? fields[key] : []), unquote(item[1])]
+      continue
+    }
+
+    const pair = /^([A-Za-z][\w-]*):\s?(.*)$/.exec(line)
+    if (!pair) continue // a wrapped value; the fields we assert on are single-line
+    key = pair[1]
+    const value = pair[2].trim()
+    fields[key] = value === '' ? [] : parseScalar(value)
+  }
+
+  return { fields, body: source.slice(match[0].length) }
+}
+
+const unquote = (v) => v.replace(/^['"]|['"]$/g, '').trim()
+
+function parseScalar(value) {
+  if (value.startsWith('[') && value.endsWith(']')) {
+    const inner = value.slice(1, -1).trim()
+    return inner ? inner.split(',').map(unquote) : []
+  }
+  return unquote(value)
+}
+
+/** Front matter list fields accept either `a, b` on one line or a block list. */
+export const asList = (value) =>
+  value === undefined ? [] : Array.isArray(value) ? value : value.split(',').map((v) => v.trim()).filter(Boolean)
+
+export function loadMarkdown(dir, file) {
+  const path = join(root, dir, file)
+  return { path: `${dir}/${file}`, ...frontMatter(readFileSync(path, 'utf8')) }
+}
+
+export const agents = () =>
+  existsSync(join(root, 'agents'))
+    ? readdirSync(join(root, 'agents')).filter((f) => f.endsWith('.md')).map((f) => loadMarkdown('agents', f))
+    : []
+
+export const skills = () =>
+  existsSync(join(root, 'skills'))
+    ? readdirSync(join(root, 'skills'), { withFileTypes: true })
+        .filter((e) => e.isDirectory() && existsSync(join(root, 'skills', e.name, 'SKILL.md')))
+        .map((e) => loadMarkdown(`skills/${e.name}`, 'SKILL.md'))
+    : []
diff --git a/test/manifests.test.mjs b/test/manifests.test.mjs
new file mode 100644
index 0000000..6660462
--- /dev/null
+++ b/test/manifests.test.mjs
@@ -0,0 +1,91 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+import { existsSync, readFileSync } from 'node:fs'
+import { join } from 'node:path'
+import { readJson, root, agents, skills, asList } from './helpers.mjs'
+
+const plugin = readJson('.claude-plugin', 'plugin.json')
+const marketplace = readJson('.claude-plugin', 'marketplace.json')
+const mcp = readJson('.mcp.json')
+
+test('plugin manifest declares a name and a semver version', () => {
+  assert.match(plugin.name, /^[a-z0-9][a-z0-9-]*$/)
+  assert.match(plugin.version, /^\d+\.\d+\.\d+/)
+  assert.ok(plugin.description?.length > 20, 'description carries the plugin listing')
+})
+
+test('marketplace entry agrees with the plugin manifest', () => {
+  const entry = marketplace.plugins.find((p) => p.source === './')
+  assert.ok(entry, 'marketplace must publish this checkout')
+  // The plugin name is baked into every scoped MCP tool name
+  // (mcp__plugin_<plugin>_<server>__<tool>), so a rename here silently breaks
+  // every agent tools list. Keep the two manifests in step.
+  assert.equal(entry.name, plugin.name)
+})
+
+test('bundled MCP servers are fully specified', () => {
+  const servers = Object.entries(mcp.mcpServers ?? {})
+  assert.ok(servers.length > 0, '.mcp.json must declare at least one server')
+  for (const [name, config] of servers) {
+    assert.match(name, /^[a-z0-9][a-z0-9-]*$/, `server key ${name} should be a plain slug`)
+    assert.ok(config.type, `server ${name} declares a transport`)
+    if (['http', 'sse', 'ws'].includes(config.type)) {
+      assert.match(config.url, /^https:\/\//, `server ${name} must be reached over https`)
+    } else {
+      assert.ok(config.command, `stdio server ${name} declares a command`)
+    }
+  }
+})
+
+test('README lists every component file the plugin ships', () => {
+  const readme = readFileSync(join(root, 'README.md'), 'utf8')
+  const shipped = [
+    '.mcp.json',
+    '.claude-plugin/plugin.json',
+    '.claude-plugin/marketplace.json',
+    ...skills().map((s) => s.path),
+    ...agents().map((a) => a.path),
+  ]
+  for (const path of shipped) {
+    assert.ok(readme.includes(path), `README should document ${path}`)
+  }
+})
+
+const scope = (s) => s.replace(/[^A-Za-z0-9_-]/g, '_')
+const components = () => [...skills(), ...agents()]
+
+test('every bundled MCP server is reached by some component', () => {
+  // Which component is deliberately not pinned: a server added for a future
+  // skill has no business being documented by an existing one. What matters is
+  // that nothing in .mcp.json is dead config.
+  for (const key of Object.keys(mcp.mcpServers ?? {})) {
+    const scoped = `plugin:${plugin.name}:${key}`
+    const prefix = `mcp__plugin_${scope(plugin.name)}_${scope(key)}__`
+    const users = components().filter(
+      (c) => c.body.includes(scoped) || asList(c.fields.tools).some((t) => t.startsWith(prefix)),
+    )
+    assert.ok(users.length > 0, `server "${key}" is declared but no skill or agent uses it`)
+  }
+})
+
+test('components that read MCP resources name the server they read from', () => {
+  // ReadMcpResourceTool takes a configured server name. Bundled in a plugin,
+  // that name is plugin:<plugin>:<server> — the bare key from .mcp.json is not
+  // a name anything answers to.
+  const scoped = Object.keys(mcp.mcpServers ?? {}).map((key) => `plugin:${plugin.name}:${key}`)
+  for (const component of components()) {
+    const uses = component.body.includes('ReadMcpResourceTool') || asList(component.fields.tools).includes('ReadMcpResourceTool')
+    if (!uses) continue
+    assert.ok(
+      scoped.some((name) => component.body.includes(name)),
+      `${component.path} reads MCP resources without naming a server; expected one of ${scoped.join(', ')}`,
+    )
+  }
+})
+
+test('every marketplace source resolves on disk', () => {
+  for (const entry of marketplace.plugins) {
+    if (typeof entry.source !== 'string' || !entry.source.startsWith('.')) continue
+    assert.ok(existsSync(join(root, entry.source)), `missing source ${entry.source}`)
+  }
+})
diff --git a/test/skills.test.mjs b/test/skills.test.mjs
new file mode 100644
index 0000000..35508a9
--- /dev/null
+++ b/test/skills.test.mjs
@@ -0,0 +1,58 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+import { skills } from './helpers.mjs'
+
+const all = skills()
+
+test('the plugin ships at least one skill', () => {
+  assert.ok(all.length > 0)
+})
+
+for (const skill of all) {
+  const { fields, body, path } = skill
+  const directory = path.split('/')[1]
+
+  test(`${path}: name matches its directory`, () => {
+    // Without a matching front matter name the skill is invoked under the
+    // install directory name, which for a marketplace install is a version
+    // string that changes on every update.
+    assert.equal(fields.name, directory)
+    assert.ok(fields.description?.length > 60, 'the description is the trigger')
+  })
+
+  test(`${path}: links are https`, () => {
+    for (const url of body.match(/https?:\/\/[^\s)`>]+/g) ?? []) {
+      assert.match(url, /^https:/, `${url} must be https`)
+    }
+  })
+}
+
+const docs = all.find((s) => s.fields.name === 'docs')
+
+test('the docs skill only sends readers to pmndrs docs and repos', () => {
+  // Specific to this skill, not a house rule: its whole job is to replace a
+  // remembered API with the published one, so an off-site link is a lookup
+  // that went somewhere it cannot vouch for.
+  for (const url of docs.body.match(/https:\/\/[^\s)`>]+/g) ?? []) {
+    assert.match(url, /^https:\/\/(docs\.pmnd\.rs|github\.com\/pmndrs)/, `${url} points outside pmndrs`)
+  }
+})
+
+test('the docs skill states which libraries are served, and when that was checked', () => {
+  assert.ok(docs, 'skills/docs/SKILL.md is where this plugin started')
+
+  const rows = [...docs.body.matchAll(/^\|\s*`([a-z0-9-]+)`\s*\|\s*(\d+)\s*\|/gm)]
+  assert.ok(rows.length >= 3, 'the coverage table should list the served libraries with page counts')
+  for (const [, lib, pages] of rows) {
+    assert.ok(Number(pages) > 0, `${lib} is listed as served but has no pages`)
+  }
+
+  // The empty-library list is a claim about the outside world; it needs a date
+  // so a reader can tell how much to trust it.
+  const checked = /checked\s+(\d{4})-(\d{2})-(\d{2})/.exec(docs.body)
+  assert.ok(checked, 'the uncovered-libraries claim must carry a checked-on date')
+  const [, y, m, d] = checked
+  const date = new Date(Date.UTC(Number(y), Number(m) - 1, Number(d)))
+  assert.equal(date.getUTCDate(), Number(d), 'checked-on date is a real date')
+  assert.ok(date.getTime() <= Date.now(), 'checked-on date is not in the future')
+})