feat(skills): add /prune-memory — curate .claude/memory/ registries
New personal skill to maintain memory registry hygiene. Gap identified between existing tools: - /caveman:compress — text-compresses one file, no curation - /close — appends new entries end-of-session, doesn't prune - /prune-memory (new) — audits, classifies, applies user-approved cleanup Operations: - Mark obsolete entries `status: superseded by <ID>` or `status: deprecated` (no hard delete — append-only per CLAUDE.md memory rule). - Merge similar entries (new ID, sources marked superseded). - Caveman-compress bloated prose-heavy entries inline. - Repair Index drift (missing rows, orphaned rows). Workflow: STEP 0 precheck (refuses dirty working tree, git = backup) → STEP 1 audit (A obsolete / B similar / C bloated / D drift) → STEP 2 plan + mandatory user approval → STEP 3 apply safe→destructive → STEP 4 verify Index sanity + line-count report. Follows superpowers:writing-skills CSO conventions: "Use when..." trigger description (under 1024-char spec), Quick Reference table, Common Mistakes table, Failure Paths table. v1 ships without baseline TDD test (noted in skill body); STEP 2 approval gate is the safety net. Co-Authored-By: Claude <noreply@anthropic.com>
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skills/prune-memory/SKILL.md
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---
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name: prune-memory
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description: |
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Use when .claude/memory/ registries grow too large or noisy — superseded
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entries verbose, similar entries cluttering, journal stale, caveman style
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drifted. Curates the 5 registries via mark-superseded + merge + inline
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caveman compression. Append-only safe (no hard delete). Git is the backup.
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Triggers: "prune memory", "compact memory", "clean memory", "memory
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hygiene", "trier memoire", "nettoyer memoire", "registres trop longs",
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"compresse les memoires".
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argument-hint: [optional: decisions|learnings|blockers|journal|evals — default all 5]
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disable-model-invocation: false
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allowed-tools:
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- Read
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- Edit
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- Write
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- Bash
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- Grep
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- Glob
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- AskUserQuestion
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---
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# /prune-memory — Memory registry curation
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Operates on `.claude/memory/` in the current project (CWD). Curates the
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5 registries: `decisions.md`, `learnings.md`, `blockers.md`, `journal.md`,
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`evals.md`.
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## Core principles
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- **Git is the backup.** Skill writes in-place. PRECHECK refuses to run
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if working tree dirty on registry files.
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- **Append-only friendly.** Marks entries `status: superseded by <new-ID>`
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or `status: deprecated` instead of deleting. Body of old entry stays
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for history.
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- **IDs stable.** Never renumber. Merges create a new ID; sources keep
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their ID with superseded status.
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- **Caveman style enforced.** Per CLAUDE.md memory rule, all writes are
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caveman-style English. Compression rewrites prose to fragments.
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- **User approves every category.** No silent changes.
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## Quick reference
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| When | Use |
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|------|-----|
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| Add new entry this session | `/close` |
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| Token-compress one file (not curating) | `/caveman:compress <file>` |
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| Curate: obsolete + merge + caveman | `/prune-memory` (this skill) |
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## STEP 0 — PRECHECK
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```bash
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test -d .claude/memory/ || { echo "no .claude/memory/ in $(pwd)"; exit 1; }
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git status --short .claude/memory/ 2>/dev/null
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```
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If working tree is dirty on any registry file → STOP with: "Commit or
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stash pending changes in `.claude/memory/` first. Skill writes in-place.
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Git is the only backup."
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## STEP 1 — AUDIT (per registry)
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For each target registry (filter by `$ARGUMENTS` or all 5):
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Read file. Classify candidates into A/B/C/D below. Use today's date for
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age comparisons. Today's date is in the system context.
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### A. Obsolete — mark-superseded candidates
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- Decisions `status: proposed` older than 90 days → propose
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`status: deprecated` (no follow-up).
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- Decisions whose body contains "superseded by <ID>" but Index row still
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says `accepted` → propose Index row fix to
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`superseded by <that-ID>`.
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- Blockers `status: open` whose root cause matches a commit in last 30
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days (grep `git log --since=30.days --grep=<keyword>`) → propose
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`status: resolved` with commit ref.
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- Journal entries older than 180 days with zero cross-reference from
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later entries → propose collapse into 1-line month summary
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(`## YYYY-MM` heading replaces detail).
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### B. Similar — merge candidates
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- Two+ entries sharing root keyword in title (e.g. `pandoc`,
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`client-handover`, `CSS overlay`).
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- Shared file paths in `**Reference**:` lines.
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- Same week + adjacent IDs + same domain.
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- Use semantic judgment on overlap; don't merge complementary entries
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that cover different angles of one concept.
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### C. Bloated — inline caveman-rewrite candidates
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- Body > 150 words AND prose-heavy.
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- Detect filler density: count `\b(the|a|an|just|really|basically|actually|simply)\b`
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matches; if > 5% of word count → bloated.
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### D. Index drift
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- Body `## (BDR|LRN|BLK|EVAL)-NNN` heading exists but no matching row
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in `## Index` table → propose Index backfill.
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- Index row exists but body entry missing → propose `status: deleted
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(orphaned)` tombstone or removal of Index row (user decides).
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## STEP 2 — PRESENT PLAN ★ MANDATORY STOP
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Print one block per registry. Example:
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```
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PRUNE PLAN — decisions.md (N entries → M after if approved)
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[A. Obsolete — mark superseded]
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BDR-003 — Gitignore wildcard pattern — status: proposed since 2026-03-12
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→ mark: status: deprecated (no follow-up after 90 days)
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BDR-011 — Client handover 4-chapter — body says superseded by BDR-013
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→ fix Index: status = "superseded by BDR-013"
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[B. Similar — merge]
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LRN-014 + LRN-016 — both pandoc rendering quirks
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→ propose: merge into NEW LRN-017 ("Pandoc rendering quirks")
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with both bodies appended + caveman pass; sources marked
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status: superseded by LRN-017
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[C. Bloated — inline caveman rewrite]
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BDR-011 — body 612 words, filler density 7.2% → ~380 expected (-38%)
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[D. Index drift]
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(none)
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Approve per category? (all / a / b / c / d / edit <ID> / skip)
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```
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Wait for user input. Default = nothing applied.
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## STEP 3 — APPLY APPROVED CHANGES
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Order: safe → destructive.
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1. **Index drift fixes** — no body changes. Backfill missing rows, mark
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orphans.
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2. **Status flag updates** — Index row status field only. Body untouched.
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3. **Merges** — write new merged entry (next-free ID); source IDs marked
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`status: superseded by <new-ID>` in Index (body kept verbatim for
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history). Merged body:
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- Preserves all `**Reference**:` lines (dedupe identical paths).
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- Caveman pass on prose during merge.
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- Keeps frontmatter fields: id (new), date (today), title, status
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(accepted), references (union).
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4. **Inline caveman compression** — preserve frontmatter exactly (id,
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date, title, status, references). Rewrite prose body to fragments:
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- Drop articles (`a`, `an`, `the`).
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- Drop filler (`just`, `really`, `basically`, `actually`, `simply`).
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- Short synonyms (`big` not `extensive`, `fix` not `implement a solution for`).
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- Keep code blocks, URLs, error messages, file paths VERBATIM.
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- Keep IDs (BDR-XXX, LRN-XXX, commit hashes) verbatim.
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After each write, regenerate Index from body when rows changed.
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## STEP 4 — VERIFY
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```bash
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# All body entries have Index rows; no orphans
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for f in .claude/memory/decisions.md .claude/memory/learnings.md .claude/memory/blockers.md; do
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prefix=$(basename "$f" .md | tr a-z A-Z | cut -c1-3)
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/usr/bin/grep -oE "^## (${prefix})-[0-9]+" "$f" | while read marker; do
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id="${marker##\#\# }"
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/usr/bin/grep -q "^| ${id} " "$f" || echo "MISSING INDEX: $id in $f"
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done
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/usr/bin/grep -oE "^\| (${prefix})-[0-9]+ " "$f" | while read row; do
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id=$(echo "$row" | awk '{print $2}')
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/usr/bin/grep -q "^## ${id} " "$f" || echo "ORPHAN INDEX: $id in $f"
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done
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done
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wc -l .claude/memory/*.md
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```
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Report:
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```
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PRUNE COMPLETE
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decisions.md : 226 → 184 lines (-19%)
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learnings.md : 190 → 165 lines (-13%)
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blockers.md : no candidates
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journal.md : 88 → 62 lines (-30%)
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evals.md : no candidates
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INDEX SANITY: OK
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NEXT: review `git diff .claude/memory/`, then `/commit-change`
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```
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## What NOT to prune
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- Journal entries < 30 days old.
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- Decisions / learnings with commit references < 14 days old.
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- Entries the user marked `status: accepted` in the current session.
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- The current session's just-capitalized entries (read `journal.md`
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tail to identify them).
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## Common mistakes
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| Mistake | Fix |
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|---------|-----|
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| Renumbering IDs after a merge | IDs are stable. Sources keep their ID + `status: superseded`. New merged entry gets next-free ID. |
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| Hard-deleting "obsolete" entries | Forbidden by append-only rule. Use `status: deprecated`. Body stays. |
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| Compressing code blocks / URLs / error messages | Caveman compression touches PROSE only. Code, URLs, IDs, error quotes stay verbatim. |
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| Running on a dirty working tree | PRECHECK blocks this. Commit first. |
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| Compressing the current session's journal entry | Excluded by "What NOT to prune" — current session capitalization is still useful. |
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| Merging complementary entries that cover different angles | Merge only when same concept, same scope. Different angles = keep separate. |
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## Failure paths
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| Situation | Behavior |
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|---|---|
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| `.claude/memory/` missing | STOP: `no .claude/memory/ in current directory; run from project root` |
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| Working tree dirty on registry files | STOP per PRECHECK; tell user to commit/stash first |
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| User says `skip` at STEP 2 | Exit cleanly, no writes |
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| Merge produces an entry > 600 words | Re-split — merge was too greedy. Re-prompt user to keep separate. |
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| Index sanity FAILED at STEP 4 | Print exact missing/orphan IDs. Do NOT auto-fix — user re-runs or hand-edits. |
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| Caveman compression result < 20% of original AND original had code blocks | Revert that entry's compression — flag as needing manual rewrite (likely stripped technical detail). |
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| Same file already compressed in same session (e.g. via `/caveman:compress`) | Skip C-category for that file; warn user that double-pass risks technical drift. |
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## Rules
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- No silent writes — every change goes through STEP 2 approval gate.
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- No renumbering — IDs are stable across all operations.
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- No hard delete in v1 — only mark superseded. (Hard delete opt-in may
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arrive in v2 if explicit demand surfaces.)
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- Working tree must be clean before any write — git is the only backup.
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- Caveman compression touches prose only; code/URLs/error quotes
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verbatim per CLAUDE.md memory format rule.
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## TDD note (skill itself)
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v1 ships without baseline test scenarios per superpowers:writing-skills
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Iron Law. Recommended before relying on the skill in production:
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1. RED: spawn subagent, give it a real `.claude/memory/` snapshot, ask
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"prune obsolete entries". Document what it does naturally.
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2. GREEN: invoke `/prune-memory` on the same snapshot. Verify it
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follows STEP 0–4 + respects append-only rule.
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3. REFACTOR: log any new rationalizations the subagent finds; add
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counters to the "Common mistakes" / "Failure paths" tables.
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Until TDD is done, the skill is v1-untested. STEP 2 approval gate is
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the human safety net.
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