Stale Brain

Audit AI agent memory and instruction files: CLAUDE.md, AGENTS.md, .cursorrules, GEMINI.md, copilot-instructions.md and every other major agent's memory files (13 agents, 18+ file locations) against the live repository. Use when the user runs /stale-brain or asks to audit, verify, refresh, lint, or fix agent memory, rules, or instruction files; when they complain the agent "ignores rules", "keeps getting it wrong", or that instructions "feel outdated"; and mid-task, whenever an instruction in a loaded memory file contradicts observed reality (a referenced path is missing, a named script doesn'

5 starsProductivity & Notes

Install

skills CLI (Claude Code, Cursor, Codex and more)

npx skills add stalebrainlabs/stalebrain --skill stale-brain

Manual install

git clone --depth 1 https://github.com/stalebrainlabs/stalebrain.git /tmp/stalebrain
mkdir -p ~/.claude/skills
cp -r /tmp/stalebrain/. ~/.claude/skills/stale-brain

Personal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.

From the SKILL.md

# stale-brain: provenance and decay for agent memory

Agent memory files are written once and trusted forever. Code moves on; the memory rots;
the agent gets confidently wrong. stale-brain is not a linter. It is a **trust model**:
after an audit, every claim in agent memory carries an **age**, a **verification date**,
and **cited evidence**.

Four laws govern everything below:

1. **Every claim carries provenance.** Confirmed claims get a dated stamp; nothing is "just true".
2. **Confidence decays.** Every claim type has a half-life. Past its half-life, a fact becomes a hypothesis until re-verified.
3. **Contradictions cite evidence.** A CONTRADICTED verdict names the files and commits that prove it, never "this looks wrong".
4. **The human approves; the human does zero detective work.** You gather all evidence and prepare ready-to-apply diffs, but you never rewrite memory without explicit approval.

## Capabilities you need (any model, any harness)

The protocol uses four generic capabilities. Map them to whatever you have:

| Capability | Claude Code | Cursor / Copilot / Windsurf / Cline | No tools at all |
|---|---|---|---|
| Find files by pattern | `Glob` | workspace file search | ask the user to paste `git ls-files` output |
| Search file contents | `Grep` | codebase/regex search | ask the user to paste the file |
| Run git / read shell output | `Bash` / `PowerShell` | integrated terminal | ask the user to run the command and paste output |

Read the full skill on GitHub

Details

Skill name: stale-brain
Repository: stalebrainlabs/stalebrain
License: MIT
Repo updated: 31 July 2026

FAQ

What does the Stale Brain skill do?

How do I install the Stale Brain skill?

skills CLI (Claude Code, Cursor, Codex and more): npx skills add stalebrainlabs/stalebrain --skill stale-brain. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.

Is Stale Brain popular?

It lives in stalebrainlabs/stalebrain, which has 5 GitHub stars and 0 forks.

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