What is openskill CLAUDE.md?

Repository instructions for OpenSkill, a command-line tool that manages skills for several AI coding assistants. They describe the project layout, commands, architecture, and how to add commands or agents.

Use them when building, testing, or extending OpenSkill, including adding CLI commands or agents and running its TypeScript development commands.

They give an AI coding assistant the project context needed to work in the repository without guessing where code, tests, and documentation belong.

How vudknguyen/openskill configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to vudknguyen/openskill. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/vudknguyen/openskill/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/vudknguyen/openskill

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/vudknguyen/openskill/claude-md/github.svg)](https://agentmods.dev/instructions/vudknguyen/openskill/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/vudknguyen/openskill/claude-md"><img src="https://agentmods.dev/badge/instructions/vudknguyen/openskill/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/vudknguyen/openskill/claude-md"><img src="https://agentmods.dev/badge/instructions/vudknguyen/openskill/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,033 This file is loaded in full into every session.

When invoked 2,033 The same file — it is already loaded in full.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.02033	$0.02033
Opus 5.5	$0.00813	$0.00813
Sonnet 5.5	$0.00407	$0.00407
Haiku 4.5	$0.00203	$0.00203

Measured 2mo ago against content hash a46b1196ac5e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

openskill CLAUDE.md scanned grade A 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 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.

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

│ ├── git.ts # Git operations via Node child_process

CLAUDE.md · 186 lines

How it starts

The opening of the file, as written. The whole thing — 186 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.

Quick Reference for AI Agents

Entry point: src/cli/index.ts
Add new commands: Create file in src/cli/, register in index.ts
Add new agents: Implement Agent interface in src/agents/, register in src/agents/index.ts
Tests: src/__tests__/*.test.ts (run with npm test)
Full architecture docs: docs/architecture.md

Project Overview

OpenSkill (osk) is a lightweight, agent-agnostic CLI for managing AI coding agent skills. Supports Claude Code, Antigravity, OpenAI Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode, Windsurf, Kiro, Warp, OpenClaw, and the generic Agents spec.

Build Commands

npm install          # Install dependencies
npm run build        # Compile TypeScript to dist/
npm run dev          # Watch mode for development
npm test             # Run tests with vitest

Running the CLI

node dist/cli/index.js <command>   # Run locally
osk <command>                      # After npm link

Architecture

src/
├── cli/           # Command handlers (commander.js)
│   ├── index.ts   # Entry point
│   ├── install.ts # Install with interactive agent/skill selection
│   └── ...        # list, uninstall, update, search, browse, repo, config, etc.
├── core/          # Business logic
│   ├── config.ts  # JSON config (~/.openskill/config.json)
│   ├── git.ts     # Git operations via Node child_process
│   ├── skill.ts   # Skill parsing/validation
│   ├── registry.ts # Git repository cache operations
│   └── manifest.ts # Installed skills tracking (~/.openskill/manifest.json)
├── agents/        # Agent adapters (strategy pattern)
│   ├── types.ts   # Agent interface
│   └── *.ts       # claude, antigravity, codex, cursor, gemini, copilot, opencode, windsurf, kiro, warp, openclaw, agents
└── utils/
    ├── logger.ts  # ANSI colors (no deps)
    ├── prompt.ts  # Interactive prompts (@inquirer/prompts)
    ├── markdown.ts # Frontmatter parsing (gray-matter)
    └── fs.ts      # File helpers

Read the full file on GitHub · 186 lines

Changes

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 · 186 lines · 2,033 tokens per session scan A a46b1196ac5e

Subscribe to this mod's changes

openskill CLAUDE.md is an instructions file published in the GitHub repository vudknguyen/openskill (10 stars, last pushed 6mo ago), licensed MIT. It adds 2,033 tokens to every session, about $0.0081 per session on Opus 5.5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

openskill CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
openskill CLAUDE.mdvudknguyen/openskill	Instructions file	10	6mo ago	MIT	A	2,033	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,685	GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	today	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,086	GitHub Copilot
vscode model-prompts.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	2,022	GitHub Copilot

openskill: Instructions file for Claude Code