Borrowing it
Nothing to install: this file belongs to voodootikigod/skills-check. 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/voodootikigod/skills-check/main/CLAUDE.mdgit clone --depth 1 https://github.com/voodootikigod/skills-checkWrote 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/voodootikigod/skills-check/claude-md)<a href="https://agentmods.dev/instructions/voodootikigod/skills-check/claude-md"><img src="https://agentmods.dev/badge/instructions/voodootikigod/skills-check/claude-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/voodootikigod/skills-check/claude-md"><img src="https://agentmods.dev/badge/instructions/voodootikigod/skills-check/claude-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 | $0.06397 | $0.06397 |
| Opus 5.5 | $0.02559 | $0.02559 |
| Sonnet 5.5 | $0.01279 | $0.01279 |
| Haiku 4.5 | $0.00640 | $0.00640 |
Grade C, and why
skills-check CLAUDE.md scanned grade C 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.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
ignore.ts # .skills-checkignore parsing + inline <!-- audit-ignore --> support How it starts
The opening of the file, as written. The whole thing — 343 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
What This Project Is
skills-check is the quality and integrity layer for Agent Skills. It answers: "Are my skills correct, safe, current, and efficient?"
Agent Skills are SKILL.md files — markdown documents with YAML frontmatter that instruct AI coding agents (Claude Code, Cursor, Codex, etc.) how to work with specific products, frameworks, and patterns. Skills look like documentation but are treated as executable instructions by agents with file system and shell access. This makes skill quality a security and correctness concern, not just a readability one.
skills-check sits alongside skills.sh (which handles installation, discovery, and distribution) as the complementary verification layer. skills.sh installs them, skills-check keeps them safe. The skills.sh maintainer is a colleague — skills-check should leverage and complement skills.sh, never duplicate or compete with it. The repo also doubles as a reusable GitHub Action (voodootikigod/skills-check@v1).
Scope: What skills-check owns
skills-check focuses on analyzing, verifying, and maintaining skills — not distributing them. Capabilities that belong here answer questions like:
- Is this skill current? — Version drift detection, staleness checking (
check,refresh) - Is this skill safe? — Security audit, hallucination detection, prompt injection scanning (
audit) - Is this skill well-formed? — Metadata validation, structural linting (
lint) - Is this skill efficient? — Context window token cost analysis (
budget) - Is this skill's version bump honest? — Content-change-to-version-bump verification (
verify) - Does this skill still work? — Eval/test integration for regression detection (
test) - Does this skill comply with our policies? — Organizational trust rules and enforcement (
policy)
Scope: What skills-check does NOT own
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 · 343 lines · 6,397 tokens per session scan C 0bb3f5264f88
skills-check CLAUDE.md is an instructions file published in the GitHub repository voodootikigod/skills-check (14 stars, last pushed 3mo ago), licensed MIT. It adds 6,397 tokens to every session, about $0.0256 per session on Opus 5.5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.