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feat(skills): add config-gc skill (#2216)
* feat(skills): add config-gc skill Garbage collection for Claude Code configuration sprawl: 8 scan channels (skills, memory, hooks, permissions, MCP, reminders, project history, caches), confirm-each-deletion human-in-the-loop, soft-delete with undo log. Subtractive counterpart to workspace-surface-audit and configure-ecc. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * fix(skills): address review feedback on config-gc - Replace invalid comment-out strategy for JSON permission files with backup + gc_log entry + jq array removal (cubic P1) - Swap GNU-only find -printf for portable du -k (works on macOS/BSD) - Capture gc date once into a variable so trash dir and undo log agree - Simplify shadowed-permission detection with jq index() guard Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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tongshu2023
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skills/config-gc/SKILL.md
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skills/config-gc/SKILL.md
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---
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name: config-gc
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description: Garbage collection for your Claude Code configuration. Periodically scans ~/.claude (skills, memory, hooks, permissions, MCP servers, caches) for redundant, stale, orphaned, or low-value items, then walks the user through a confirm-each-deletion cleanup. Use when the user says "clean up my config", "config GC", "too many skills", "audit my setup", "my .claude is bloated", or asks for a periodic config review.
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origin: ECC
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---
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# Config GC — Garbage Collection for Claude Code Setups
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Borrowed from runtime garbage collection: periodically scan for objects that are no longer referenced, redundant, expired, or low-value, and reclaim the space. The critical difference: **here, collection requires a human in the loop. Never delete autonomously.**
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## When to Activate
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- The user asks to clean up, audit, or slim down their Claude Code configuration
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- The user complains about too many skills, noisy hooks, or slow session startup
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- A monthly/periodic config review is due
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- After installing a large skill pack (e.g. this repo), to reconcile overlaps with existing setup
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Do NOT activate for: cleaning project source code (that's refactoring), clearing chat history, or uninstalling Claude Code itself.
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## Design Philosophy
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1. **Append-only configs leak.** Skills, memory files, hooks, and permission entries only ever get added. Without periodic review they rot silently.
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2. **Regular audits beat one-time purges.** Scan every ~30 days, propose a small batch of candidates each time.
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3. **Per-channel strategies.** Each accumulation type (skills, hooks, permissions, ...) has its own staleness signals — don't apply one rule everywhere.
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4. **Soft-delete first.** Rename to `.disabled` > move to `~/.claude/_gc_trash/` > real deletion. Always keep an undo path.
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5. **Forced human-in-the-loop.** Every candidate gets its own `[y/n/skip]` confirmation. No "yes to all" shortcut.
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6. **Keep a log.** Every GC run appends to `~/.claude/gc_log.md`: what was touched, why, and how to undo it.
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## Scan Channels
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| # | Channel | Path | Staleness / redundancy signals |
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|---|---------|------|--------------------------------|
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| 1 | Skills | `~/.claude/skills/*/` | Heavily overlapping names; never triggered in recent transcripts; domain mismatch with the user's actual work; broken or empty SKILL.md |
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| 2 | Memory | `~/.claude/**/memory/*.md` + its index | Multiple index entries for one topic; contents contradicting newer entries; dates that have passed; orphan files missing from the index; sub-100-word fragments that should merge |
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| 3 | Hooks | `~/.claude/hooks/` + settings | Scripts present on disk but referenced by no hook config; old versions superseded by rewrites |
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| 4 | Permissions | `permissions.allow` in `settings.json` / `settings.local.json` | Duplicate entries; specific entries already covered by a wildcard (e.g. `Bash(git push)` when `Bash(*)` is allowed); one-off grants from past experiments |
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| 5 | MCP servers | `~/.claude.json` or project `.mcp.json` | Servers that fail to connect; functional duplicates; long-unused |
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| 6 | Scheduled reminders / jobs | wherever the user keeps them | Fired one-shots older than 30 days; jobs whose target scripts no longer exist |
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| 7 | Project history | `~/.claude/projects/*/` | Stale handoff snapshots; session records superseded by newer state |
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| 8 | Runtime caches | `cache/`, `file-history/`, `logs/`, `shell-snapshots/` | Sort by size and mtime; propose items >30 days old and large |
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## Workflow
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1. **Scan** all channels (or the subset the user names). Collect candidates with: path, channel, signal that flagged it, size, last-modified.
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2. **Rank** by confidence (broken/orphaned = high; merely old = low) and present as a numbered table. Cap each run at ~20 candidates — GC is periodic, not exhaustive.
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3. **Confirm one by one.** For each candidate show the evidence, then ask `[y/n/skip]`. The user can stop at any point.
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4. **Soft-delete confirmed items**: prefer `.disabled` rename for skills/hooks and `_gc_trash/<date>/` move for files. Permission entries live in JSON (no comments possible): back up the settings file, record each removed entry verbatim in `gc_log.md`, then remove it from the `allow` array with `jq`. Only hard-delete when the user explicitly asks.
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5. **Log** the run to `~/.claude/gc_log.md`: timestamp, items actioned, undo instructions.
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6. **Report**: reclaimed size, channels still healthy, suggested next review date.
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## Example Scan Commands
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Orphaned hook scripts (channel 3) — scripts on disk that no hook config references:
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```bash
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for f in ~/.claude/hooks/*; do
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name=$(basename "$f")
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grep -rq "$name" ~/.claude/settings.json ~/.claude/settings.local.json 2>/dev/null \
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|| echo "ORPHAN: $f"
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done
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```
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Redundant permission entries (channel 4) — duplicates, and specific grants shadowed by a wildcard:
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```bash
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jq -r '.permissions.allow[]' ~/.claude/settings.local.json | sort | uniq -d
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if jq -e '.permissions.allow | index("Bash(*)")' ~/.claude/settings.local.json >/dev/null; then
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jq -r '.permissions.allow[]' ~/.claude/settings.local.json \
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| grep '^Bash(' | grep -vF 'Bash(*)'
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fi
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```
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Largest stale caches (channel 8) — `du -k` instead of GNU-only `find -printf`, so it works on macOS/BSD too:
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```bash
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find ~/.claude/file-history ~/.claude/shell-snapshots -type f -mtime +30 \
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-exec du -k {} + 2>/dev/null | sort -rn | head -20
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```
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Soft-delete with undo path (capture the date once so the log can't disagree with the directory):
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```bash
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gc_date=$(date +%Y-%m-%d)
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mkdir -p ~/.claude/_gc_trash/$gc_date
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mv ~/.claude/skills/dead-skill ~/.claude/_gc_trash/$gc_date/
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echo "$(date -Iseconds) moved skills/dead-skill -> _gc_trash/$gc_date/ (undo: mv back)" >> ~/.claude/gc_log.md
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```
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Removing a confirmed-redundant permission entry (JSON has no comments — back up, log, then edit):
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```bash
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cp ~/.claude/settings.local.json ~/.claude/settings.local.json.bak
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echo "$(date -Iseconds) removed permission entry: Bash(git push) (undo: restore from .bak or re-add)" >> ~/.claude/gc_log.md
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jq '.permissions.allow -= ["Bash(git push)"]' ~/.claude/settings.local.json.bak \
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> ~/.claude/settings.local.json
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```
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## Anti-Patterns
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- **Bulk approval.** Asking "delete all 15? [y/n]" defeats the design. One item, one decision.
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- **Hard-deleting on first pass.** If there's no `_gc_trash/` copy or `.disabled` rename, you did it wrong.
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- **Treating "old" as "dead".** A skill untouched for 60 days may be seasonal (tax season, quarterly reviews). Age is a signal, not a verdict — that's why a human confirms.
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- **Cleaning memory by truncation.** Merging two contradicting memory files requires reading both and keeping the newer truth, not deleting the longer one.
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- **Touching anything outside `~/.claude`** (or the project's `.claude/`). Config GC never wanders into source trees.
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## Best Practices
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- Run after big additions, not just on a calendar: installing a 50-skill pack is exactly when overlap with existing skills appears.
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- When two skills overlap, prefer disabling the one with the weaker trigger description — it's the one that was probably never firing anyway.
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- Permission cleanup is the highest-value channel per minute spent: redundant allow-entries make security review harder.
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- Keep `gc_log.md` forever. It's tiny, and "when did I disable that hook and why" comes up more often than you'd think.
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## Related Skills
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- `skill-stocktake` — audits skill *quality*; config-gc audits skill *existence*. Run stocktake on what survives GC.
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- `workspace-surface-audit` — the additive counterpart: recommends what to install. config-gc is the subtractive half of the same lifecycle.
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- `configure-ecc` — after installing skills with it, run config-gc to reconcile overlaps with your pre-existing setup.
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- `continuous-learning` — produces the memory files this skill later audits.
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- `security-review` — pairs well with the permissions channel.
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