ai-agent

Agent Skills

Name: Agent Skills
Author: addyosmani

Production-grade engineering skills for AI coding agents.

90,239 stars9,652 forksJavaScriptUpdated 8/27/2026100% free · open source

What it does

Provides ready‑made JavaScript functions (skills) that let AI coding agents read, write, and manipulate codebases directly from prompts.

When to use it

•You need an LLM‑driven bot to automatically refactor or lint a repo without writing custom file‑system code.
•Your product builds a “code‑assistant” feature (e.g., generate missing tests) and you want plug‑and‑play skills instead of reinventing them.
•You want to prototype AI‑powered code reviews or bug‑hunting with minimal boilerplate.

Ready-to-paste prompt

`await agent.run('Generate unit tests for all functions in src/utils.js that lack coverage');`

Heads up: The library uses OpenAI function calling; you must have a valid `OPENAI_API_KEY` environment variable and be on Node >=18, otherwise the skill initialization will throw.

Saves to your device

Use with Claude

New

Skip the builder — one click puts this in Claude, Cursor, Antigravity and more.

⚡ Runs out of the box

A prompt/skill package — nothing to install beyond adding it to your AI tool.

Try it instantly — no install

Claude Code

mkdir -p ~/.claude/skills/agent-skills && curl -fsSL https://workflowstacks.com/api/skills/agent-skills/claude-skill -o ~/.claude/skills/agent-skills/SKILL.md

Open in another AI app

Opens the app with this repo with the prompt ready to go — no copy-paste needed.

Connect the whole catalog (MCP)

claude mcp add --transport http workflowstacks https://workflowstacks.com/api/mcp

Adds a WorkflowStacks connector to Claude Code: search and load any skill here by chatting.

How Agent Skills works

Codeflow

Free to inspect

Agent Skills is mostly documents (89 doc files, 20 small scripts) — something you read, not something you run. You install it into your AI tool with one command; there is nothing to run yourself. Last commit this month, MIT license.

Size

Mostly documents

89 documents · 20 small scripts · ~2 h to skim

Setup

Install as a skill / plugin

Add it to Claude Code (or your AI tool) with one command — 24 skills inside. Nothing to run yourself.

Runs on

Inside your AI tool

Nothing to install on your machine

JavaScript 72%Shell 26%Python 1%HTML 1%

Where to start reading

1
README.md
Start here — what it does and how to install it
2
AGENTS.md
The instructions the AI actually follows
3
skills/api-and-interface-design/SKILL.md
Inside skills/ — an example of what the AI is told to do

What's in each folder

skills/Prompts, skills & agent definitions28 files

commands/Prompts, skills & agent definitions8 files

agents/Prompts, skills & agent definitions4 files

docs/Documentation14 files

evals/Evaluations & benchmarks73 files

scripts/Helper scripts13 files

hooks/Hooks — scripts that auto-run on events9 files

references/Folder7 files

READMEHas testsDocumentedCI checksMIT licenseUpdated this month

Use with Claude

New

Skip the builder — one click puts this in Claude, Cursor, Antigravity and more.

⚡ Runs out of the box

A prompt/skill package — nothing to install beyond adding it to your AI tool.

Try it instantly — no install

Claude Code

mkdir -p ~/.claude/skills/agent-skills && curl -fsSL https://workflowstacks.com/api/skills/agent-skills/claude-skill -o ~/.claude/skills/agent-skills/SKILL.md

Open in another AI app

Opens the app with this repo with the prompt ready to go — no copy-paste needed.

Connect the whole catalog (MCP)

claude mcp add --transport http workflowstacks https://workflowstacks.com/api/mcp

Adds a WorkflowStacks connector to Claude Code: search and load any skill here by chatting.

Quick Actions

Details

Creator

addyosmani

Language

JavaScript