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Agent Skills

Free

Production-grade engineering skills for AI coding agents.

FreeFree tier
Type
Open Source
Company
Addy Osmani
Visit Website GitHub (17.7k stars)

About Agent Skills

Agent Skills is an open-source collection of production-grade engineering skills packaged as commands for AI coding agents. It encodes the workflows, quality gates, and best practices that senior engineers use when building software, allowing AI agents to follow them consistently across every phase of development. The project provides 24 skills accessible via 8 slash commands (e.g., /spec, /plan, /build, /test, /review, /ship) that map to the development lifecycle. It also offers a /build command that auto-generates a plan and implements tasks autonomously after approval. Skills activate automatically based on context—for example, designing an API triggers api-and-interface-design, while building UI triggers frontend-ui-engineering. The tool is compatible with over 70 AI coding agents including Claude Code, Cursor, Codex, Copilot, and Cline, and can be installed via the npx skills add CLI or as a plugin for the Claude Code marketplace.

Key Features

24 production-grade engineering skills for AI coding agents
8 slash commands mapping to the development lifecycle: /spec, /plan, /build, /test, /review, /ship, /webperf, /code-simplify
Context-aware automatic skill activation (e.g., API design or UI engineering)
/build command auto-generates plan and implements tasks autonomously after approval
Compatible with 70+ AI coding agents including Claude Code, Cursor, Codex, Copilot, Cline
Install via CLI: npx skills add addyosmani/agent-skills
Plugin available for Claude Code marketplace
Open-source under MIT license
Skills cover spec writing, planning, test-driven development, code review, web performance auditing, code simplification, and shipping

Pros & Cons

Pros
  • Enforces consistent engineering best practices across all supported AI agents
  • Reduces manual steps with auto-generated plans and autonomous task execution
  • Context-aware skills adapt to the current development phase
  • Free and open-source with no vendor lock-in
  • Wide compatibility with popular AI coding tools
  • Covers the full development lifecycle from spec to ship
Cons
  • Requires initial setup and configuration for each AI agent
  • Skills are limited to the predefined set; may not cover all project-specific needs
  • Effectiveness depends on the underlying AI agent's capabilities

Best For

Defining and refining product specifications with AI agentsPlanning development tasks into small, atomic unitsBuilding code incrementally with test-driven developmentAutomated code review and quality gating before mergeAuditing web performance with measurable optimizationSimplifying complex code for maintainabilityStreamlining production releases with faster, safer shipping

FAQ

What is Agent Skills?
Agent Skills is an open-source collection of production-grade engineering skills packaged as commands for AI coding agents. It encodes workflows, quality gates, and best practices used by senior engineers.
How many skills are included?
The project includes 24 skills covering areas such as API design, test-driven development, code review, web performance, and more.
Which AI agents are compatible?
Works with over 70 agents including Claude Code, Cursor, Codex, GitHub Copilot, Cline, and others.
How do I install Agent Skills?
You can install all skills using: npx skills add addyosmani/agent-skills. For Claude Code, use the plugin marketplace: /plugin marketplace add addyosmani/agent-skills.
Is Agent Skills free?
Yes, it is completely free and open-source under the MIT license.