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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+ Use when .claude/memory/ registries grow too large or noisy — superseded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 Curates the 5 registries via mark-superseded + merge + inline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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+
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+# /prune-memory — Memory registry curation
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+
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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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+
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+## Core principles
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+
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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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+
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+## Quick reference
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+
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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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+
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+## STEP 0 — PRECHECK
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+
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+```bash
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+test -d .claude/memory/ || { echo "no .claude/memory/ in $(pwd)"; exit 1; }
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+git status --short .claude/memory/ 2>/dev/null
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+```
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+
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+If working tree is dirty on any registry file → STOP with: "Commit or
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+stash pending changes in `.claude/memory/` first. Skill writes in-place.
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+Git is the only backup."
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+
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+## STEP 1 — AUDIT (per registry)
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+
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+For each target registry (filter by `$ARGUMENTS` or all 5):
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+## STEP 2 — PRESENT PLAN ★ MANDATORY STOP
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+
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+Print one block per registry. Example:
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+
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+```
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+PRUNE PLAN — decisions.md (N entries → M after if approved)
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+
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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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+
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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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+
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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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+
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+[D. Index drift]
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+ (none)
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+
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+Approve per category? (all / a / b / c / d / edit <ID> / skip)
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+```
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+
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+Wait for user input. Default = nothing applied.
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+
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+## STEP 3 — APPLY APPROVED CHANGES
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+
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+Order: safe → destructive.
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+
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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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+
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+After each write, regenerate Index from body when rows changed.
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+
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+## STEP 4 — VERIFY
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+
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+```bash
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+# Filename → ID-prefix map. Hard-mapped because filenames don't share
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+# their first 3 chars with the prefix (decisions → BDR, not DEC).
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+# v1 bug: derived prefix via `basename | cut -c1-3` → never matched,
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+# verify printed false-clean signal. Fixed in v1.1 (TDD found it).
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+declare -A PREFIX_MAP=(
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+ [decisions]=BDR
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+ [learnings]=LRN
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+ [blockers]=BLK
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+ [evals]=EVAL
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+)
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+
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+# All body entries have Index rows; no orphans
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+for fname in decisions learnings blockers evals; do
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+ f=".claude/memory/${fname}.md"
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+ [ -f "$f" ] || continue
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+ prefix="${PREFIX_MAP[$fname]}"
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+
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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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+echo "(blank above = OK)"
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+
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+wc -l .claude/memory/*.md | grep -v "\.original\.md"
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+```
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+
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+Report:
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+
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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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+
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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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+
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+## What NOT to prune
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+
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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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+
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+## Common mistakes
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+
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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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+
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+## Failure paths
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+
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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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+
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+## Rules
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+
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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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+
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+## TDD note (skill itself)
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+
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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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+
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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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+
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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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