#9 of 15 · Top Claude Code skills

addyosmani/agent-skills

Addy Osmani's engineering skills for each stage of building software, from spec and plan to test, review and ship, behind nine slash commands.

Planning and review Plugin GitHub skills.addy.ie

Stars: 106,387
Contributors: 81
Latest release: 0.6.13, 13 Oct 2026
Licence: MIT

This week, #8 of 15

+418 forks 50 commits 9 people committing 1 release

This month, #8 of 15

+1,166 forks 178 commits 21 people committing 4 releases

What does addyosmani/agent-skills do?

Agent Skills packages the workflows, quality gates and practices senior engineers use, so an agent follows them through every phase of building software: define, plan, build, verify, review and ship. Nine slash commands map to those phases, from /spec and /plan to /test, /review and /ship, and skills also start on their own from what you are doing, such as designing an API or building UI.

Its default branch holds 25 SKILL.md files, 4 agent files and 9 command files.

How do you install addyosmani/agent-skills in Claude Code?

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

How fast is addyosmani/agent-skills being forked?

Forks over time, by the day each was made

How actively is addyosmani/agent-skills maintained?

450 commits in 52 weeks, and 15 releases in 12 months

Commits per weekRelease

Alternatives in the same category

obra/superpowers
Composable skills that make a coding agent draw out a spec, write a plan, then build it test-first through subagents that review each task.
298,840 stars
mattpocock/skills
Matt Pocock's everyday engineering skills, kept small and composable so you adapt them instead of handing a framework the whole process.
290,282 stars
affaan-m/ECC
A plugin of 311 skills, 71 agents, hooks and rules that make an agent plan before it builds, test its changes, review its own work and keep what it learns.
278,825 stars
garrytan/gstack
Garry Tan's skills that make Claude Code act as an engineering team: product and architecture review, code review, QA in a real browser and a security audit, each a command.
136,348 stars

Numbers are from the GitHub API on 14 October 2026, read once a day; what it does and how to install it are from its README. All 15 Claude Code skills.

addyosmani/agent-skills

What does addyosmani/agent-skills do?

How do you install addyosmani/agent-skills in Claude Code?

How fast is addyosmani/agent-skills being forked?

How actively is addyosmani/agent-skills maintained?

Alternatives in the same category

obra/superpowers

mattpocock/skills

affaan-m/ECC

garrytan/gstack