# Addy Osmani's Agent Skills

> Addy Osmani's engineering workflows for coding agents: spec, plan, build, test, review and ship, with quality gates at each step.

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.

- Type: Plugin
- Made by: addyosmani
- Category: Developer tools
- Formats: Claude plugins
- Version: 0.6.12
- Website: https://skills.addy.ie
- Source: https://github.com/addyosmani/agent-skills
- Page: https://pluginboard.ai/plugins/addy-osmani-agent-skills

## Works with

- Claude
- GitHub Copilot
- Claude Code
- OpenClaw

## Install

### Claude

In Claude (web or desktop): Customize → Plugins → Add → Add marketplace, enter addyosmani/agent-skills, then add agent-skills

### Claude Code

In Claude Code:

```text
/plugin marketplace add addyosmani/agent-skills
/plugin install agent-skills@addy-agent-skills
```

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From Pluginboard (https://pluginboard.ai).