# Agent Skills (Addy Osmani)

> Production lifecycle skills — /spec /plan /build /test /review /ship

**Category:** AI Agents  
**Pricing:** open-source  
**URL:** https://skills.addy.ie  
**GitHub:** https://github.com/addyosmani/agent-skills  
**Added:** 2026-09-17

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## The Hook

Addy’s Agent Skills encode senior-engineer gates so coding agents cannot skip the boring parts that keep software shippable.

## What's Good

MIT (addyosmani/agent-skills). ~25 structured SKILL.md workflows with anti-rationalization tables and verification exits, plus slash commands mapping define→plan→build→verify→review→ship. `npx skills add addyosmani/agent-skills` hits 70+ agents; Claude/Codex/Cursor/Gemini/Antigravity adapters documented. Draws explicitly from Google eng practices (Hyrum’s Law, Beyoncé Rule, change sizing). Docs and site at skills.addy.ie. ★~96k.

## The Catch

Per-skill installs can miss shared `references/` checklists — prefer whole-repo or full pack install. Still markdown discipline, not a runtime that forces compliance if the host ignores skills. Vs Superpowers (session-hijacking SDLC methodology) and knowledge-work-plugins (Anthropic official packs): this is the Google-flavored lifecycle library you pick skill-by-skill, not an automatic brainstorm→subagent loop.

## Verdict

MIT production skill pack. Reach for it when you want explicit /spec→/ship gates across many harnesses.