Addy Osmani's pack of 25 engineering skills and slash commands that take a coding agent from spec and plan through tests, review and shipping.
Free tool inAgent skills and plugins
Agent Skills (Addy Osmani) at a glance
Checked 19 Oct 2026Agent 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.
RepoQuarry. “Agent Skills (Addy Osmani).” Checked 19 Oct 2026. https://repoquarry.dev/projects/addyosmani-agent-skillsWhat it replaces
Nothing people pay for: it’s a free tool, listed because people search for it. Find similar projects in Agent skills and plugins.
Facts, with sources
Every answer links to where we found it. We read the documentation; we did not install it.
Skills are plain Markdown - they work with any agent that accepts system prompts or instruction files.github.com · agent-skills#readme ↗ 3d ago
Permission is hereby granted, free of charge, to any person obtaining a copy of this softwaregithub.com · LICENSE ↗ 3d ago
The open skills CLI installs into 70+ agents (Claude Code, Cursor, Codex, Copilot, Cline, and more)github.com · agent-skills#readme ↗ 3d ago
Evidence summary (paraphrase): README documents Windows/macOS installation troubleshooting. A complete host-OS support matrix was not verified.raw.githubusercontent.com · README.md ↗ 2d ago
npx skills add addyosmani/agent-skillsgithub.com · agent-skills#readme ↗ 3d ago
No licence changes since we started watching. Licence watch: follow Agent Skills (Addy Osmani) and we email you if its licence terms change.
Growth and activity in detail
Is it popular, and is anyone still working on it? From GitHub.
- Actively maintained86 people committing, active 11 of the last 12 weeks.
86 people committing in the last 12 months · 63 pull requests merged in 30 days · 17 issues opened, 14 closed in 30 days
Stars over time
Building history+955 stars since 18 Oct 2026. The 7-day comparison and the trend label start once there is a full week of daily counts.
- Agent Skills (Addy Osmani)
Tracked daily since 18 Oct 2026. Dashed history: estimated from public records of when people starred the repo. Lines connect observations only; gaps contain no measured points.
Commits per week, last 52 weeks
active 11 of the last 12 weeksUp 34% on the 12 weeks before.
Where these numbers come from
- Stars, forks, releases: GitHub's public API, fetched every night (last fetch today).
- Star history: counted every night since 18 Oct 2026.
- Commits and people committing: GitHub's repository statistics, counted weekly. Names are never stored.
- Pull requests and issues: counted from GitHub for the last 30 days.
- Stars show popularity, not quality. The facts below are checked separately, by reading the project's own documentation. How we check.