# os-doc-hygiene — component detail

_Leaf file of [../implementation-status.md](../implementation-status.md). Read on demand._

**Global os-doc-hygiene plugin** — `cc-os/plugins/os-doc-hygiene/` (git-tracked,
2026-07-03); symlinked into `~/.claude/plugins/os-doc-hygiene`.

- Hooks: `hooks/hooks.json` → SessionStart hook (matcher: startup|resume) runs
  `scripts/reminder.py` via `${CLAUDE_PLUGIN_ROOT}` (5s timeout), emitting a deterministic
  zero-token reminder banner (once/day snooze).
- Behavior: monitors stale and bloated project documentation; per-project state under
  `.cc-os/dochygiene/` (gitignored; moved from `.dochygiene/` 2026-07-12 per ADR-0027, with
  canonical-then-legacy fallback reads and auto-migration + legacy dir removal on first
  write; scanner self-excludes `.cc-os/`).
- Skills (verb-first, no `commands/` dispatcher — invoked directly as
  `/os-doc-hygiene:<skill>`, per [[cc-os-plugin-skill-naming-convention]]): `check`
  (AI-assisted classification of staleness signals, emits machine+human reports), `clean`
  (AI-assisted or deterministic patch application with git-safe scoped cleanup), `status`
  (read-only lifecycle-timestamp read), `sweep` (check then clean in sequence).
  Reversion-protected via invariants.md + golden-example test fixtures.
- Scanner signals: broken refs, version skew, churn, archive ratio, frontmatter markers,
  and — added 2026-07-13 (issue #25 part 1) — a deterministic `file_length` signal
  (defaults 400 lines / 4000 estimated tokens, `--max-lines` / `--max-tokens`; token
  estimate via `scripts/token_estimator.py`). Objective facts only; classification lives
  downstream. Suite 286 passed as of 2026-07-13 (279 at the ADR-0027 move).
- Migration: migrated from standalone repo (`~/dev/cc-plugins/doc-hygiene/`, 2026-07-03) and
  integrated into cc-os; no content conflicts. Renamed `doc-hygiene` → `os-doc-hygiene` per
  the cc-os naming convention; skills renamed `hygiene-check`/`hygiene-clean` →
  `check`/`clean`; the `commands/hygiene.md` dispatcher was removed in favor of two new
  skills (`status`, `sweep`), aligning with the no-`commands/`-directory pattern
  (2026-07-03).
- **Lifecycle-aware hygiene (2026-07-15, ADR-0038–0041)** — adds a rulebook layer on top of
  the existing stale/bloat scanner: a global `rulebook.json` plus an optional per-project
  `.dochygiene-rules.json` declare lifetime rules for known-temporary artifacts (ADR-0038).
  Rules classify matched paths into the lifetime taxonomy and drive a tier matrix from
  scanner-proven+tracked+clean (`auto`) down to classifier-judged (`confirm`) (ADR-0039); an
  IGNORE sentinel prunes matched paths with zero emission and does not propagate ignore
  status to children (ADR-0040). Classifier-judged matches that recur are surfaced
  deterministically as `promotion_candidates` from `conventions.json`, not model-authored
  (ADR-0041). New `/os-doc-hygiene:calibrate` skill runs the cluster/nominate/judge/
  human-report protocol to tune rules against a real project. Calibration pass #1 (cc-os)
  ran 2026-07-14/15 and passed both the protected-set hard gate and the recall floor across
  all 4 mandatory rows; rule persistence to `.dochygiene-rules.json` is pending human
  approval. Results: `plugins/os-doc-hygiene/openspec/changes/lifecycle-aware-doc-hygiene/calibration-pass-1-results.md`.
  Design: `plugins/os-doc-hygiene/lifecycle-spec.md`. Suite: 407 passed.