Borrowing it
Nothing to install: this file belongs to mishanefedov/skillrot. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/mishanefedov/skillrot/main/AGENTS.mdgit clone --depth 1 https://github.com/mishanefedov/skillrotWrote 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/instructions/mishanefedov/skillrot/agents-md)<a href="https://agentmods.dev/instructions/mishanefedov/skillrot/agents-md"><img src="https://agentmods.dev/badge/instructions/mishanefedov/skillrot/agents-md/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/instructions/mishanefedov/skillrot/agents-md"><img src="https://agentmods.dev/badge/instructions/mishanefedov/skillrot/agents-md.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 | $0.00375 | $0.00375 |
| Opus 5.5 | $0.00150 | $0.00150 |
| Sonnet 5.5 | $0.00075 | $0.00075 |
| Haiku 4.5 | $0.00038 | $0.00038 |
Grade A, and why
skillrot AGENTS.md scanned grade A with 0 findings 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 2mo 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
AGENTS.md — guide for coding agents working in this repo
skillrot audits agent skills for external-CLI drift. This file is the tool-agnostic guide (Claude Code, Codex, Cursor, etc. all read it).
Layout
src/— the engine.extract.ts(parse skill bash → invocations),introspect.ts(probe installed CLIs via--help/--version),analyze.ts(compare used flags vs. accepted),report.ts,cli.ts.skills/skillrot/SKILL.md— the skill definition (plugin layout)..claude-plugin/— Claude Code plugin + marketplace manifests.bin/skillrot— launcher (on PATH under the plugin and viabun link).scripts/gen-logo.ts— regeneratesassets/skillrot.svg.test/—bun test; deterministic fixtures (a fake CLI) so tests don't rot.
Conventions
- Runtime: Bun. No build step — Bun runs the TypeScript directly.
- Zero runtime dependencies. Keep it that way; the engine only uses
node:*. - Before pushing:
bun testandbun run typecheckmust pass. - The engine must never run a skill's real subcommand — only append
--help/--version. This is the core safety property. - Be conservative: a missing long flag is an error; anything uncertain (short flags, unreadable help, unparseable lines) is a warning. Don't cry wolf.
Dogfood
bun run src/cli.ts skills # skillrot audits its own skill (CI does this too)
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.
- 2mo ago First seen · 32 lines · 375 tokens per session scan A a8acceb8c306
skillrot AGENTS.md is an instructions file published in the GitHub repository mishanefedov/skillrot (2 stars, last pushed 4mo ago), licensed MIT. It adds 375 tokens to every session, about $0.0015 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.