Borrowing it
Nothing to install: this file belongs to 2ykwang/agent-skills. 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/2ykwang/agent-skills/main/CLAUDE.mdgit clone --depth 1 https://github.com/2ykwang/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/instructions/2ykwang/agent-skills/claude-md)<a href="https://agentmods.dev/instructions/2ykwang/agent-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/2ykwang/agent-skills/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/2ykwang/agent-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/2ykwang/agent-skills/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 | $0.00802 | $0.00802 |
| Opus 5.5 | $0.00321 | $0.00321 |
| Sonnet 5.5 | $0.00160 | $0.00160 |
| Haiku 4.5 | $0.00080 | $0.00080 |
Grade A, and why
agent-skills CLAUDE.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 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.
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.
How it starts
The opening of the file, as written. The whole thing — 110 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.
Overview
Skills for AI coding agents. Each skill lives under skills/. The plugins/ directory and marketplace.json are auto-generated.
Commands
just generate # Generate plugins/ and marketplace.json from skills/
just validate # Validate skill structure
just test # Run script tests (unittest, no dependencies)
just check # Run all pre-commit hooks
just version-bump # Bump patch version for changed skills (edits SKILL.md frontmatter)
Skill Structure (source)
skills/<name>/
├── SKILL.md # Skill definition (YAML frontmatter + body)
└── references/ # Optional supporting docs (read at runtime by the skill)
Generated Output (do not edit manually)
plugins/<name>/
├── .claude-plugin/
│ └── plugin.json # Generated from SKILL.md frontmatter
├── skills/ # Copied from skills/<name>/
│ ├── SKILL.md
│ └── references/
└── README.md # Generated with install commands
.claude-plugin/marketplace.json is also generated.
Adding a New Skill
/add-skill <skill-name>— scaffoldsskills/<name>/, generates plugins, updates README- Edit
skills/<name>/SKILL.md— replace TODO content just generate && just validate
Validation Rules
scripts/validate.py checks:
- Each
skills/<name>/SKILL.mdhas frontmatter fields:name,description,version(semver),category - Skill folder names are kebab-case (
^[a-z0-9]+(-[a-z0-9]+)*$)
Runs automatically via pre-push hook.
SKILL.md Format
---
name: skill-name
version: 0.0.1
category: development
description: One sentence — what it does and when to trigger it.
argument-hint: "<argument>"
---
## Instructions
Use $ARGUMENTS to reference user input.
Versioning
Edit version in skills/<name>/SKILL.md frontmatter. Run just generate to propagate to plugin.json and marketplace.json.
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 · 110 lines · 802 tokens per session scan A 936dd99e8896
agent-skills CLAUDE.md is an instructions file published in the GitHub repository 2ykwang/agent-skills (19 stars, last pushed 2mo ago), licensed MIT. It adds 802 tokens to every session, about $0.0032 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 2026-08-30.
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.