Addy Osmani Releases Open-Source Agent Skills for Coding Agents
Addy Osmani of Google released Agent Skills, 19 engineering skills and 7 slash commands that enforce specs, tests, and reviews for coding agents including Claude Code and Cursor. The project is free, open source, and installable via npx.
Original post · 1 min read
@addyosmani from Google just dropped his new Agent Skills and it's incredible.
It brings 19 engineering skills + 7 commands to AI coding agents, all inspired by Google best practices 🤯
AI coding agents are powerful, but left alone, they take shortcuts.
They skip specs, tests, and security reviews, optimizing for "done" over "correct." Addy built this to fix that.
Each skill encodes the workflows and quality gates that senior engineers actually use: spec before code, test before merge, measure before optimize.
The full lifecycle is covered:
→ Define - refine ideas, write specs before a single line of code
→ Plan - decompose into small, verifiable tasks
→ Build - incremental implementation, context engineering, clean API design
→ Verify - TDD, browser testing with DevTools, systematic debugging
→ Review - code quality, security hardening, performance optimization
→ Ship - git workflow, CI/CD, ADRs, pre-launch checklists
Features 7 slash commands: (/spec, /plan, /build, /test, /review, /code-simplify, /ship) that map to this lifecycle.
It works with:
✦ Claude Code
✦ Cursor
✦ Antigravity
✦ ... and any agent accepting Markdown. Baking in Google-tier engineering culture (Shift Left, Chesterton's Fence, Hyrum's Law) directly into your agent's step-by-step workflow!
`npx skills add addyosmani/agent-skills`
Free and open-source.
Repo link in 🧵↓