Agent Skills is a collection of production-grade engineering skills by Addy Osmani, designed so AI coding agents follow senior engineering workflows consistently across every phase of development.
Seven slash commands map to the full development lifecycle:
/spec— Define what to build with requirements and acceptance criteria/plan— Break work into small, atomic, verifiable tasks/build— Implement incrementally, one slice at a time/test— Prove it works with failing tests first/review— Five-axis code review before merge/code-simplify— Clarity over cleverness/ship— Pre-launch checklist, monitoring, rollback plan
The collection includes 19 skills covering the full engineering lifecycle — from spec-driven development and TDD through security hardening, performance optimisation, and deployment — plus three dedicated agent personas (code reviewer, security auditor, test engineer) that run as subagents for structured, formatted review passes.
Compatible with Claude Code, Cursor, and Gemini CLI.