Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add nklofy/code-agent-skills --skill config-gcgit clone --depth 1 https://github.com/nklofy/code-agent-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/nklofy/code-agent-skills/config-gc)<a href="https://agentmods.dev/skills/nklofy/code-agent-skills/config-gc"><img src="https://agentmods.dev/badge/skills/nklofy/code-agent-skills/config-gc/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/nklofy/code-agent-skills/config-gc"><img src="https://agentmods.dev/badge/skills/nklofy/code-agent-skills/config-gc.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00101 | $0.01967 |
| Opus 5.5 | $0.00040 | $0.00787 |
| Sonnet 5.5 | $0.00020 | $0.00393 |
| Haiku 4.5 | $0.00010 | $0.00197 |
Grade B, and why
config-gc scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
grep -rq "$name" ~/.claude/settings.json ~/.claude/settings.local.json 2>/dev/null \ This is a copy
95% identical to config-gc — 30 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Config GC — Garbage Collection for Claude Code Setups
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.
When to Activate
- The user asks to clean up, audit, or slim down their Claude Code configuration
- The user complains about too many skills, noisy hooks, or slow session startup
- A monthly/periodic config review is due
- After installing a large skill pack (e.g. this repo), to reconcile overlaps with existing setup
Do NOT activate for: cleaning project source code (that's refactoring), clearing chat history, or uninstalling Claude Code itself.
Design Philosophy
- Append-only configs leak. Skills, memory files, hooks, and permission entries only ever get added. Without periodic review they rot silently.
- Regular audits beat one-time purges. Scan every ~30 days, propose a small batch of candidates each time.
- Per-channel strategies. Each accumulation type (skills, hooks, permissions, ...) has its own staleness signals — don't apply one rule everywhere.
- Soft-delete first. Rename to
.disabled> move to~/.claude/_gc_trash/> real deletion. Always keep an undo path. - Forced human-in-the-loop. Every candidate gets its own
[y/n/skip]confirmation. No "yes to all" shortcut. - Keep a log. Every GC run appends to
~/.claude/gc_log.md: what was touched, why, and how to undo it.
Scan Channels
| # | Channel | Path | Staleness / redundancy signals |
|---|---|---|---|
| 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 |
| 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 |
| 3 | Hooks | ~/.claude/hooks/ + settings |
Scripts present on disk but referenced by no hook config; old versions superseded by rewrites |
| 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 |
| 5 | MCP servers | ~/.claude.json or project .mcp.json |
Servers that fail to connect; functional duplicates; long-unused |
| 6 | Scheduled reminders / jobs | wherever the user keeps them | Fired one-shots older than 30 days; jobs whose target scripts no longer exist |
| 7 | Project history | ~/.claude/projects/*/ |
Stale handoff snapshots; session records superseded by newer state |
| 8 | Runtime caches | cache/, file-history/, logs/, shell-snapshots/ |
Sort by size and mtime; propose items >30 days old and large |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 121 lines · 101 tokens per session scan B e8ade5c8d487
config-gc is a skill published in the GitHub repository nklofy/code-agent-skills (18 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 101 tokens to every session and 1,967 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads agent configuration directories). It is 95% identical to config-gc, differing in 30 lines, and is treated as a copy.
Other skills, from other repositories
knowledge-ingest
Ingest documents, articles, conversations, or supplied text into Knowledge with retained originals, sourced claims, entity updates, timelines, and cross-links; also learn durable lessons from a set of conversations, transcripts, or past sessions (/learn), including the Learn from conversations and Learn from Memory…
mem0-oss-to-platform
Plan, then execute, a migration of a project from the mem0 open-source / self-hosted SDK (local Memory class) to the mem0 Platform / hosted SDK (MemoryClient). TRIGGER when: the developer wants to move, switch, or migrate mem0 off OSS/self-hosted to the hosted API, e.g. "migrate my mem0 setup to the platform", "switch…
forget
Remove a personal fact, preference, relationship detail, topic, or prior event from Muse's active memory and stop existing copies or automations from bringing it back. Use for explicit requests such as 'forget that', 'don't remember this about me', or 'remove that from your memory'. Do not use when 'forget it' merely…
Cortex
LifeOS memory, prior-session recall, and learning capture. USE WHEN capture this learning, document this learning, what did we learn recently, recent learnings, cortex, knowledge, knowledge base, search knowledge, what do we know about, archive, harvest, knowledge status, develop note, add to knowledge, add a people…
memory
Use when the user asks to remember, recall, forget, update, search, or inspect durable OpenSquilla memory, including profile facts in USER.md and long-term notes in MEMORY.md or memory//.md.
ha-data-stores
Map of Hope Agent's local data stores and safe read-only query workflow. Use when the user asks where Hope Agent stores data, wants to inspect sessions/messages/memory/logs/background jobs/knowledge indexes/settings, asks the model to query local app data, or debugging requires checking persisted state. Trigger…