Addy Osmani's engineering workflows for coding agents: spec, plan, build, test, review and ship, with quality gates at each step.
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About
Agent Skills is Addy Osmani's pack of engineering skills for AI coding agents, built with Federico Bartoli and Joan León. Each skill is a structured workflow with steps, verification gates and a table of the excuses agents use to skip steps, drawing on practices from Software Engineering at Google and Google's engineering practices guide. What you can do with it - /spec: write a PRD covering objectives, structure, code style, testing and boundaries before any code - /plan: break the spec into small, verifiable tasks with acceptance criteria - /build: build in thin vertical slices, test-first, committing as you go; /build auto runs the whole plan after you approve it once - /test: red-green-refactor, plus browser testing through Chrome DevTools MCP - /constraints: set a quality bar and write it to CONSTRAINTS.md - /review: a five-axis review before merge (in Claude Code, /agent-skills:review) - /webperf: a Core Web Vitals audit - /code-simplify: reduce complexity without changing behaviour - /ship: pre-launch checklists, staged rollouts and rollback plans Its skills also load on their own: designing an API brings in api-and-interface-design, and building UI brings in frontend-ui-engineering. Others cover debugging, security hardening, performance, git workflow, CI/CD, documentation and ADRs, observability, deprecation and migration, and interviewing you until the ask is clear. It also has reviewer personas: a code reviewer, a test engineer, a security auditor and a web performance auditor. How to install it In Claude Code, run /plugin marketplace add addyosmani/agent-skills, then /plugin install agent-skills@addy-agent-skills. In Codex, run codex plugin marketplace add addyosmani/agent-skills, then codex plugin add agent-skills@agent-skills. The README also covers Gemini CLI, Cursor, GitHub Copilot, OpenCode and more. Good to know - No sign-in: the skills run inside your agent. - The lifecycle slash commands are Claude Code commands; in other agents you call the skills by name. - It's MIT licensed.
Once it’s added
“Interview me until this feature is clear.”
“Write a spec for team invites before we write any code.”
“Break this spec into small tasks with acceptance criteria.”
“Build the plan one slice at a time, test-first.”
“Review this change before I merge it.”
“Audit the Core Web Vitals of our checkout page.”
Before you add it
Reads only
Your codebase and specs, to plan and review changes · Live browser data through Chrome DevTools MCP, when testing in a browser
Makes changes · your agent can ask first
Specs, task plans and CONSTRAINTS.md · Code and tests, one slice and one commit at a time · Review findings and launch checklists
Each with its own page
From people who use it
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/plugin marketplace add addyosmani/agent-skills /plugin install agent-skills@addy-agent-skills
Scanned and passed · checked 9 h ago
Plugins people install alongside Addy Osmani's Agent Skills.
Nothing new reaches your agent until a person has looked at it.
Scanned on every change, and again when our rules improve.
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Safe to install in every agent it supports. Claude plugins.
Plugins people install alongside Addy Osmani's Agent Skills.
Skills that make your coding agent brainstorm, plan, test-drive, debug and review its work before it calls the job done.
Matt Pocock's everyday engineering skills: grilling sessions, specs and tickets, TDD, bug diagnosis, code review and writing for agents.
