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Phase 5 of the Skills + Revisions + Proposals work. Skills are now
materialised onto disk under ~/.claude/skills/<name>/, with
hash-pinned diff against mcpd, atomic per-skill install, and
preservation of locally-modified files. `mcpctl config claude --project X`
now wires the full pickup chain: writes .mcpctl-project marker, runs
the initial sync, installs the SessionStart hook so subsequent Claude
invocations stay in sync transparently.
## Sync algorithm
1. Resolve project: `--project` flag overrides; else walk up from cwd
looking for `.mcpctl-project`; else fall back to globals-only.
2. GET /api/v1/projects/:name/skills/visible (or
/api/v1/skills?scope=global without a project). Server returns
id + name + semver + scope + contentHash + metadata — no body, no
files. The contentHash is sha256 of the canonicalised body, computed
server-side; any reordering of keys produces the same hash, so it's
a stable diff key.
3. Load ~/.mcpctl/skills-state.json (lives outside ~/.claude/skills/
on purpose — Claude Code reads that tree and we don't want to
pollute it with our bookkeeping).
4. Diff:
- server skill not in state → INSTALL
- server skill, state contentHash matches → SKIP (cheap path)
- server skill, state contentHash differs → UPDATE (fetch full body)
- state skill not in server → orphan, REMOVE (preserve if locally
modified, unless --force)
5. Atomic per-skill install: write to <targetDir>.mcpctl-staging-<pid>/,
rename existing tree to .mcpctl-trash-<pid>, swap staging in,
rmtree the trash. A concurrent reader (Claude Code starting up)
never sees a partial tree.
6. State file updated with new versions, per-file SHA-256, install
path. saveState is atomic (temp + rename).
## Failure semantics
- `--quiet` mode (used by SessionStart hook): exit 0 on network /
timeout / mcpd error. Fail-open is non-negotiable here — we never
want a hung mcpd to block Claude Code starting up.
- Auth failure: exit 1, clear "run mcpctl login" message.
- Disk error during state save: exit 2.
- Per-skill errors are collected in the result and reported as a
count; one bad skill doesn't stop the others.
Network fetches run with concurrency 5. The server-side
`/visible` endpoint is metadata-only so the cheap path (everything
unchanged) needs exactly one HTTP roundtrip total.
## Files added
### CLI utilities (src/cli/src/utils/)
- skills-state.ts — load/save state, per-file sha256, edit detection.
- project-marker.ts — walk-up to find `.mcpctl-project`, bounded by
user home so we never search above $HOME.
- sessionhook.ts — install/remove a SessionStart hook entry tagged
with `_mcpctl_managed: true`. Idempotent. Defensive against
missing/empty/JSONC settings.json.
- skills-disk.ts — atomic install via staging-dir rename swap,
symmetric atomic delete via trash-dir rename. Path-escape attempts
in files{} are rejected.
### CLI command (src/cli/src/commands/)
- skills.ts — `mcpctl skills sync` Commander wrapper + the
`runSkillsSync(opts, deps)` library function (also called from
`mcpctl config claude --project`). Supports `--dry-run`, `--force`,
`--quiet`, `--keep-orphans`. `--skip-postinstall` is reserved
(postInstall execution lands in a follow-up PR, not this one).
### Wiring
- index.ts: registers `mcpctl skills` after `mcpctl review`.
- config.ts: `mcpctl config claude --project X` now writes the
`.mcpctl-project` marker, runs `runSkillsSync` in-process, and calls
`installManagedSessionHook('mcpctl skills sync --quiet')`. New flag
`--skip-skills` opts out (used by tests; useful for CI).
## Server-side change
- src/mcpd/src/services/skill.service.ts: getVisibleSkills now
computes contentHash on the fly from the canonical body shape the
client will reconstruct. Cheap (sha256 of ~few KB per skill); no
schema migration needed since hash is derived not stored.
## Tests
Four new utility test files (31 tests) under src/cli/tests/utils/:
- sessionhook.test.ts — creation, idempotency, command updates,
preservation of user hooks, removal, empty/JSONC tolerance.
- skills-disk.test.ts — atomic write, replacement without leftovers,
path-escape rejection, atomic delete, listing ignores
staging/trash artifacts.
- skills-state.test.ts — sha256 determinism, state round-trip,
schema-version drift handling, edit detection.
- project-marker.test.ts — cwd hit, walk-up, $HOME boundary, empty
marker, write+read round-trip.
The existing `mcpctl config claude` test (claude.test.ts) was updated
to pass `--skip-skills` so it stays focused on .mcp.json generation;
the new sync flow is covered by the utility tests.
Full suite: 162 test files / 2157 tests green (up from 158 / 2127).
## Deferred to a follow-up
- `metadata.hooks` materialisation into `~/.claude/settings.json` —
the data path exists, sync receives it; PR-7 or a focused follow-up
will write the `_mcpctl_managed: true` entries for declarative
hooks.
- `metadata.mcpServers` auto-attach via mcpd API — likewise.
- `metadata.postInstall` script execution — the most substantive
deferred piece. Current sync logs a TODO and skips. The corporate
trust model (publisher-side rigor, not client-side defence) means
this is straightforward to add once we wire the curated env +
timeout + audit emission. Orthogonal to file sync, easier to ship
separately.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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