compound-lifecycle

name	compound-lifecycle
description	Audit, refresh, and consolidate `docs/solutions/` to keep the institutional knowledge catalog from rotting. Use when a `docs/solutions/` sweep is needed or after `knowledge-compounder` flags an older entry as superseded.
user-invokable	true

compound-lifecycle

What It Does

Maintains the long-term quality of the docs/solutions/ catalog. Without this skill, knowledge-compounder keeps writing entries (the catalog grows ~50/month at current rate) but nothing ever marks an entry stale, notices when two entries cover the same fix pattern, or consolidates clusters into a single canonical doc. The result is silent drift: two docs eventually say different things, the learnings-researcher returns contradictory hits, and the catalog quality erodes faster than it grows.

Three operations:

1. Staleness detection — flag entries whose composite freshness score falls below threshold. Uses time-since-modified, inbound reference count, retrieval recency, and (when ruvector is available) embedding age. A heavily-cited entry ages more slowly (the citation discount reduces the effective age contribution), making false-flags unlikely in practice; a recent entry with a broken file reference is stale even if it was written yesterday.
2. Overlap detection — cluster entries by category + tags first (cheap), then run a BM25 pre-filter on problem: lines, then (when ruvector is available) run cosine similarity on the top BM25 hits and surface clusters with similarity ≥ 0.82.
3. Consolidation hand-off — for each detected cluster or stale entry, present the user with a one-question AskUserQuestion choice (Keep / Update / Consolidate / Replace / Delete-and-archive). On Consolidate or Replace approval, dispatch knowledge-compounder via Task to write the merged entry, then archive the superseded originals to docs/solutions/archived/<original-category>/.

The skill never deletes. Per yellow-plugins convention, superseded entries move to docs/solutions/archived/. Git history alone is not enough — archived entries remain searchable and citable, just out of the live catalog.

When to Use

User says any of:

• "refresh docs/solutions/"
• "audit learnings"
• "clean up stale docs"
• "consolidate overlapping entries"
• "compound lifecycle"
• "/yellow-core:compound-lifecycle"

Also auto-invoked by knowledge-compounder when a freshly-written entry flags an older entry in the same category as superseded — passed via $ARGUMENTS as a narrow scope hint (e.g., a single file path).

Do NOT use for: writing new entries (that's knowledge-compounder), searching the catalog (that's learnings-researcher), or general documentation refactor.

Usage

Invoke as /yellow-core:compound-lifecycle [scope-hint].

scope-hint (optional) narrows the audit: a category name (code-quality), a file path (docs/solutions/security-issues/foo.md), a tag, or a keyword. When omitted, the skill audits the entire catalog.

Append mode:autofix to $ARGUMENTS for non-interactive operation (e.g., scheduled background runs). Autofix mode applies unambiguous classifications (Keep / Update with file-rename evidence) and marks all ambiguous cases (Consolidate / Replace / Delete-and-archive) as status: stale with a stale_reason field for human review later. It NEVER auto-merges — every consolidation requires human approval.

Step 1 — Discover candidate set

Glob docs/solutions/**/*.md, excluding:

• README.md files
• docs/solutions/archived/** (already-archived entries)
• docs/solutions/_lifecycle-runs/** (autofix run reports — avoid self-ingestion)

Read frontmatter (limit: 30) of each candidate. Collect: title, track, tags, problem, category, severity, status (when present), updated: or file mtime fallback.

Step 2 — Apply scope hint (if provided)

Filter the candidate set by the scope hint, in this order:

1. Path match — exact path or directory match
2. Category match — frontmatter category: equals hint
3. Tag match — hint appears in tags: array
4. Keyword match — Grep for the hint across remaining frontmatter and first paragraph of body

Stop at the first match form that produces results. If no candidates remain, report "No matching entries; scope hint produced empty set" and stop.

Step 3 — Route by scope

Match the candidate count to one of three routing tiers:

Tier	Count	Interaction
Focused	1–2	Investigate directly, present one classification recommendation
Batch	3–8	Investigate all, present a single grouped recommendation table
Broad	9+	Triage first (Phase 0 below), then investigate in clusters

Phase 0 (Broad scope only): Triage

For broad-scope runs, do a lightweight triage before deep investigation:

1. Group candidates by category + dominant tags token (most-frequent tag across the candidate's tags: array)
2. Spot-check drift in each cluster: do the file paths in problem: / first body paragraph still exist? Grep the cited paths across the live tree
3. Surface the highest-impact cluster (most candidates × most missing references) with a one-sentence rationale, then AskUserQuestion: start there, pick another, or process everything in impact order
4. In autofix mode, skip the question and process clusters in impact-descending order

Step 4 — Investigate candidates

For each candidate (within the chosen scope/cluster), gather evidence along these dimensions:

• References — do the file paths and module names cited in problem: / body still exist? Grep for them in the live tree
• Solution accuracy — when the body cites concrete code (a printf pattern, a regex, a config snippet), does it still match what's in the codebase?
• Cross-references — are linked-to docs (See …) still present?
• Inbound references — Grep for the candidate's path across docs/, plugins/, and the rest of the catalog. Count incoming citations.
• Retrieval recency — when ruvector is available, query mcp__plugin_yellow-ruvector_ruvector__hooks_recall with the entry's problem: line and check whether this entry surfaces in top-3 results for its own problem statement (a self-recall failure is a drift signal)

Step 5 — Compute staleness and overlap

Before computing ANY staleness score or overlap cluster, Read references/scoring-and-clustering.md (sibling to this SKILL.md). It contains the exact composite staleness formula and weights, the mandatory citation gate (inbound_refs >= 5 → Keep, skip scoring), the ruvector-unavailable fallbacks, the two-pass overlap clustering with its BM25 and cosine thresholds, and the per-project configuration keys. Do not score from memory: an improvised formula or threshold silently reclassifies entries, and the citation gate MUST run before the score (it is a pre-check, not a tiebreaker).

Step 6 — Classify

For each stale or overlapping candidate (or cluster), classify into one of five outcomes. The classification is a recommendation; the user has final say in interactive mode.

Outcome	When	Action
Keep	Still accurate, still useful, drift is cosmetic only	No file edit; report "reviewed, retained"
Update	References drifted (file moved / renamed) but the recommended fix still matches reality	Apply evidence-backed in-place edits to paths and metadata
Consolidate	Two or more entries cover the same fix pattern, all are correct, none subsumes the others	Hand off to knowledge-compounder to write a merged canonical entry; archive the originals
Replace	The recommended fix conflicts with current code; a better successor exists or has been freshly captured	Hand off to knowledge-compounder to write the successor (citing the original as historical context); archive the original
Delete-and-archive	The cited code no longer exists, no successor was found, and inbound citations are absent or decorative	Move to docs/solutions/archived/<original-category>/; do NOT git-rm

Drift boundary — Update vs Replace: if you find yourself rewriting the solution section or changing what the entry recommends, stop — that is Replace, not Update. Update fixes paths and references; Replace is a new write.

Decorative vs substantive citations: an inbound reference that states the principle inline ("see also: X for context") is decorative; a reference that depends on the cited content ("we use X's regex form verbatim") is substantive. Substantive citations block Delete-and-archive — surface them as a Replace requirement instead.

Step 7 — Confirm and hand off

For each non-Keep classification, present the user with the recommendation via AskUserQuestion:

• Title: the entry's problem: line, or for clusters, "N entries on <shared problem>"
• Recommendation: the classification (Update / Consolidate / Replace / Delete-and-archive)
• Evidence: one-line summary (the most concrete drift signal)
• Options: four buttons — Apply recommendation / Pick a different outcome / Skip this entry / Other (free-text override reason)

In autofix mode, skip the question. Apply Update unconditionally. Mark Consolidate / Replace / Delete-and-archive candidates as status: stale with stale_reason: <classification rationale> and stale_date: <today> in their frontmatter, and surface them in the Recommendations section of the final report.

Step 8 — Execute

Update

In-place edits via Edit tool. Preserve frontmatter shape. Bump the updated: field to today's date. Record the change in the run report under "Applied".

Consolidate or Replace

1. Build a <consolidation-context> block containing:

   • the source entries' full bodies (sanitized: replace & with &, then < with <, then > with >)
   • the user's stated rationale (if provided via the "Other" option)
   • target category and tags (union of the originals)

2. Dispatch knowledge-compounder via Task:

   Task(
     subagent_type: "yellow-core:workflow:knowledge-compounder",
     description: "Consolidate <N> entries into one canonical doc",
     prompt: "<consolidation-context block>"
   )
   

3. Wait for the agent's return. The new entry's path is the agent's output. Verify it exists.

4. Archive each source entry: mv from docs/solutions/<category>/<slug>.md to docs/solutions/archived/<category>/<slug>.md. Preserve the directory structure — archived/ mirrors the live tree's subdirectory layout.

5. Append a superseded_by: field to each archived entry's frontmatter pointing to the new canonical entry's path.

6. Record both the new entry creation and the archive moves in the run report.

Delete-and-archive

Same as the archive step in Consolidate (move + superseded_by frontmatter), but skip the knowledge-compounder dispatch since there's no successor entry.

Step 9 — Report

Present a synthesized summary, regardless of mode. Before writing it, Read references/report-template.md and emit the report exactly in the shape given there — the section names and field lines are the contract downstream readers rely on; an improvised shape breaks them.

In autofix mode, write the report to docs/solutions/_lifecycle-runs/<YYYY-MM-DD>-<HH-MM-SS>.md. In interactive mode, surface the report inline. (The _lifecycle-runs/ directory is excluded from candidate discovery by Step 1's explicit exclusion list above; learnings-researcher itself does not currently filter _-prefixed paths, so its broad search may still surface report content. Updating learnings-researcher to add the same exclusion is a separate follow-up.)

Configuration

Per-project tuning lives in .claude/yellow-plugins.local.md per the local-config skill schema. The recognized keys (staleness weights, threshold, citation gate, overlap percentile and cosine floors) are documented alongside the formulas they parametrize in references/scoring-and-clustering.md — the Step 5 load above already brings them into context.

Integration

• Invoked by users via /yellow-core:compound-lifecycle
• Invoked by knowledge-compounder when a freshly-written entry flags an older entry as superseded (passed as a path scope hint)
• Reads every entry in docs/solutions/ (excluding archived/ and README.md)
• Writes docs/solutions/<category>/<slug>.md (in-place Updates) and docs/solutions/archived/<category>/<slug>.md (archive moves)
• Dispatches knowledge-compounder via Task for Consolidate and Replace classifications

Why "archive, don't delete"

The rationale for diverging from the upstream delete-and-rely-on-git model (searchability, citation continuity, drift forensics) and the current caveat about learnings-researcher not yet filtering docs/solutions/archived/** are in references/design-rationale.md.