Agent Skills Agent Skills
Agent Skills is Addy Osmani's pack of production-grade engineering skills for AI coding agents. It encodes the workflows, quality gates, and judgment senior engineers apply across the development lifecycle — define, plan, build, verify, review, ship — as nine slash commands (`/spec`, `/plan`, `/build`, `/test`, `/constraints`, `/review`, `/webperf`, `/code-simplify`, `/ship`) that activate the right skills automatically. Skills such as test-driven-development, incremental-implementation, api-and-interface-design, frontend-ui-engineering, and code-review-and-quality also trigger contextually based on what the agent is doing, and each is a structured workflow with steps, verification gates, and anti-rationalization tables. `/build` can run plan-and-implement autonomously after one approval while keeping every task test-driven and individually committed. The open skills CLI installs into 70+ agents including Claude Code, Cursor, Codex, Copilot, and Cline.
Release 0.6.9 on September 5, 2026; ~94.6k GitHub stars and 500+ commits, trending on GitHub in September 2026. Accompanied by the author's design write-up and the skills.addy.ie documentation site.
As of
- 25 lifecycle skills covering spec, planning, TDD, incremental implementation, review, and shipping
- Nine slash commands mapped to the SDLC that auto-load the relevant skills
- Contextual auto-activation (API design, frontend UI, debugging, web performance)
- Anti-rationalization tables and verification gates inside every skill
- Autonomous `/build` mode that pauses on failures or risky steps
- One-command install into 70+ agents via `npx skills add`; per-skill installs supported
Developers and teams who want their coding agents to follow senior-engineer practices (specs, tests, review, scope discipline) consistently without hand-writing rules files for each agent.
Users looking for a standalone product with a UI, teams needing centrally enforced policy, or those who prefer a more prescriptive end-to-end methodology such as Superpowers or Spec Kit.
Free and open-source under MIT; installed into your existing agents with `npx skills add addyosmani/agent-skills` (all 25 skills or individual ones) and runs on your current agent subscription.
A well-reasoned, broadly compatible skills pack from a respected Chrome/Google engineer; lighter than a full methodology framework while still pushing agents through the phases they usually skip.
Is Agent Skills free?
Yes - Agent Skills is Open Source. Free and open-source under MIT; installed into your existing agents with `npx skills add addyosmani/agent-skills` (all 25 skills or individual ones) and runs on your current agent subscription.
Is Agent Skills open source?
Yes - Agent Skills is open source. Free and open-source under MIT; installed into your existing agents with `npx skills add addyosmani/agent-skills` (all 25 skills or individual ones) and runs on your current agent subscription.
Who is Agent Skills best for?
Developers and teams who want their coding agents to follow senior-engineer practices (specs, tests, review, scope discipline) consistently without hand-writing rules files for each agent.
Who is Agent Skills not ideal for?
Users looking for a standalone product with a UI, teams needing centrally enforced policy, or those who prefer a more prescriptive end-to-end methodology such as Superpowers or Spec Kit.
What are the best Agent Skills alternatives?
The closest Agent Skills alternatives on ai.dosa.dev are Pieces for Developers, agenttrace, Vibe Kanban - all listed under Developer Productivity & Workflow.
Who makes Agent Skills?
Agent Skills is developed by Addy Osmani. It is listed in the Developer Productivity & Workflow category on ai.dosa.dev.
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