# Agent Skills (Addy Osmani)

> Agent Skills is a pack of 25 Markdown skills (24 lifecycle skills plus a router) with commands such as /spec, /plan, /build, /test, /review and /ship, plus reviewer personas and checklists. Each skill lists steps, excuses to reject and evidence required. It installs with the skills CLI or as a plugin for Claude Code, Codex, Gemini CLI, Antigravity and others; Cursor, Copilot and Windsurf need manual setup. You need a coding agent and its paid plan or API key. MIT licence. Free add-on; it does not replace a paid product.

- Repository: https://github.com/addyosmani/agent-skills
- Official docs: https://github.com/addyosmani/agent-skills#readme
- Checked: 2026-10-19

## What it replaces
Nothing people pay for: a free tool, listed because people search for it.

## Facts, with sources

| Question | Status | Answer | Source | Checked |
|---|---|---|---|---|
| Runs on my machine? | Confirmed | Yes, skills are plain Markdown loaded by a local coding agent | https://github.com/addyosmani/agent-skills#readme | 2026-10-18 |
| Code licence | Confirmed | MIT | https://github.com/addyosmani/agent-skills/blob/main/LICENSE | 2026-10-18 |
| Model weights licence | Confirmed | No separate model weights | https://github.com/addyosmani/agent-skills#readme | 2026-10-18 |
| Commercial use | Confirmed | Yes, MIT allows commercial use | https://github.com/addyosmani/agent-skills/blob/main/LICENSE | 2026-10-18 |
| Paid services needed? | No | Needs an AI coding agent, which needs a paid plan or API key | https://github.com/addyosmani/agent-skills#readme | 2026-10-18 |
| Hardware | Unknown | Not documented | none found | - |
| Operating systems | Partial | README documents Windows/macOS installation troubleshooting. A complete host-OS support matrix was not verified. | https://raw.githubusercontent.com/addyosmani/agent-skills/HEAD/README.md | 2026-10-19 |
| Setup effort | Confirmed | Easy, one npx command or a plugin install | https://github.com/addyosmani/agent-skills#readme | 2026-10-18 |

GitHub: 108998 stars, 11364 forks, last push 2026-10-13, archived: no.
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Source: RepoQuarry (https://repoquarry.dev/projects/addyosmani-agent-skills). Data licence: CC BY 4.0. Quotes are from project documentation and belong to their authors.