addyosmani/agent-skills

What is it?

Key features

• 01Covers the full development lifecycle with slash commands for spec, plan, build, test, review and ship.
• 02Each skill has step-by-step processes, verification gates and common rationalizations to watch for.
• 03Installable per skill or as a whole pack across many agents via the skills CLI or native plugins.
• 04Includes specialist personas for code review, testing, security auditing and web performance auditing.
• 05Ships reference checklists for security, performance, accessibility and observability.

Use cases

• Giving an AI coding agent consistent engineering discipline for features that touch many files.
• Adding a spec-first and test-first workflow to a team that uses Claude Code, Codex or Gemini CLI.
• Running a five-axis code review or security audit on changes before merging.
• Onboarding agents to an existing codebase with an incremental, verification-first rollout.

Quick start

1. 1

   Install all skills with the open skills CLI

   npx skills add addyosmani/agent-skills
2. 2

   Or add the Claude Code marketplace and install the plugin

   /plugin marketplace add addyosmani/agent-skills

Things to know

• !Individual skill installs omit the shared references/ directory, so some supplementary checklists are unavailable.

Topics

FAQ

What is agent-skills?

A set of production-grade engineering workflow skills, packaged as Markdown, that guide AI coding agents through spec, plan, build, test, review, and ship. Agent Skills is a collection of structured SKILL.md workflows that teach AI coding agents to follow the habits of senior engineers: writing a spec before code, breaking work into small verifiable tasks, practicing test-driven development, reviewing changes against a five-axis checklist, and shipping with feature flags and staged rollouts. The pack contains 25 skills grouped by lifecycle phase (define, plan, build, verify, review, ship), plus a meta-skill that routes incoming work to the right one.

Is agent-skills free to use? What license does it have?

agent-skills is open source under the MIT license. Check the license terms before using it in commercial products.

Is agent-skills still maintained?

Actively maintained. The last commit to agent-skills was on Oct 13, 2026.

What can I use agent-skills for?

Giving an AI coding agent consistent engineering discipline for features that touch many files. Adding a spec-first and test-first workflow to a team that uses Claude Code, Codex or Gemini CLI. Running a five-axis code review or security audit on changes before merging. Onboarding agents to an existing codebase with an incremental, verification-first rollout.

How do I install agent-skills?

Install all skills with the open skills CLI: npx skills add addyosmani/agent-skills Or add the Claude Code marketplace and install the plugin: /plugin marketplace add addyosmani/agent-skills

Where can I get agent-skills?

The source code and installation instructions are on GitHub: https://github.com/addyosmani/agent-skills