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Agent Skills

Engineering workflow skills (spec, plan, build, test, review, ship) that guide AI coding agents.

GitHub Download 0.6.15
Stars
113k
Forks
11.8k
Licence
MIT
Language
JavaScript
Last update
4 days ago
Type
Other

What it is

This project is a collection of Markdown 'skills' that describe how experienced engineers approach each phase of building software, from defining a spec to shipping. You install them into an AI coding agent such as Claude Code, Cursor, or Codex so the agent follows those workflows and quality checks more consistently. Slash commands like /spec, /plan, /build, /test, /review, and /ship map to lifecycle stages.

  • Run /spec to define a feature before any code is written
  • Use /plan to break work into small tasks, then /build to implement one slice at a time
  • Install the code-review-and-quality skill to get a five-axis review before merging
  • Use /webperf to audit web performance of a project

Great for

  • Developers who already use an AI coding agent and want more structured, test-driven output
  • Teams wanting a shared set of engineering checklists applied across AI-assisted work
  • Solo developers who want a spec-first, plan-first workflow from their agent
  • People using one of the supported agents listed in the README who want a native integration

Not ideal for

  • People who do not use AI coding agents, since the skills are instructions for those agents rather than a standalone program
  • Beginners looking for a general programming course; the skills assume familiarity with software engineering practices
  • Users of agents not covered by the README, who would need to adapt the Markdown files themselves
Step-by-step guide: how to use Agent SkillsInstall, first run, examples, tips and FAQs

How to get it

  1. 1

    Install with a package manager

    You'll need: Node.js (required for npx skills CLI; version not stated in README) · An AI coding agent such as Claude Code, Cursor, or Codex

    Install all skills with the skills CLI

    npx skills add addyosmani/agent-skills

    Browse skills before installing

    npx skills add addyosmani/agent-skills --list

    Install the Claude Code marketplace plugin

    /plugin install agent-skills@addy-agent-skills
  2. 2

    Run it

    • Install the skills using the npx command or your agent's native integration
    • Open your agent in a project folder
    • Run /spec to define what you want to build
    • Run /plan, then /build to implement in small steps
  3. 3

    Get the most out of it

    • Use /build auto to generate a plan and implement every task in one approved pass, while keeping tests and per-task commits
    • Install a whole-repo integration rather than single skills so shared references/ files are available
    • Use the namespaced form /agent-skills:review in Claude Code when a built-in command has the same name
    • Use the per-agent setup docs linked in the README, such as docs/cursor-setup.md, for tool-specific configuration

Downloads

Source code (.zip)main branch · straight from GitHubRelease 0.6.15Release notes and sourceOfficial website & docsskills.addy.ie

Strengths

  • Covers the full development lifecycle, not just one task
  • Installs across many agents through the skills CLI or native plugins, according to the README
  • MIT licensed and actively maintained, with a recent push date

Trade-offs

  • Installing a single skill with npx omits shared reference files, which the README says can limit some skills (tracked in issue #361)
  • Several integrations need manual setup, such as Cursor and Windsurf, and some slash commands only exist in Claude Code
  • Some commands behave differently across agents, so results will depend on which agent you use

How it compares

ProjectStarsTypeLevelUpdatedBest for
agent-skills (this)113kOtherbeginner4 days agoDevelopers who already use an AI coding agent and want more structured, test-driven output
humanizer63.8kAI model / agentbeginner9 days agoWriters who draft with an AI and want the final text to sound more natural
agents42.1kDev toolbeginner4 days agoDevelopers who already use one of the listed AI coding tools and want ready-made specialist agents
planning-with-files27.8kDev toolbeginner6 days agoDevelopers running long multi-step tasks in Claude Code or Codex CLI
khazix-skills21.8kCurated listbeginner1 months agoDevelopers already using Claude Code, Codex, or another Agent Skills-compatible agent who want ready-made skills
ego-lite21.3kAppbeginner4 days agoDevelopers who use Claude Code, Codex, or similar agent CLIs and want them to act in a logged-in browser

Stats synced from GitHub. The assessment above was drafted with AI from the project's README on 2026-10-29 and may miss recent changes — check the README before relying on a command. MIT licence: free to use, modify and distribute, including commercially, as long as you keep the copyright notice.