Agents are fast at writing code and equally fast at writing the wrong code. addyosmani/agent-skills is a set of 25 skills that put a spec, a plan and tests between your idea and the diff. It works with Claude Code, Cursor and Codex, and installs with one command. Here is the short path from a vague feature idea to a tested change.
Left alone, a coding agent jumps straight to code, skips the spec and hands you a large change that is hard to verify. The skills push the agent through the same order a careful engineer would use: define what to build, break it into small tasks, build one slice at a time, test, then ship.
npx skills add addyosmani/agent-skills
This installs all 25 skills into your agent. You need Node.js for npx skills. If you only want one skill, add --skill <name> to the same command, for example --skill interview-me. A per-skill install copies only that skill, not the shared checklists, so install the whole repo if you want those.
Run:
/spec
Describe what you want to build. The spec comes before any code. If your idea is still fuzzy, install and use the interview-me skill first, so the agent asks requirement questions one at a time instead of silently guessing.
/plan
The plan breaks the spec into small, atomic tasks. Read it. This is the cheapest moment to catch a wrong assumption, because nothing has been built yet.
/build
This implements one slice at a time, test-driven. If you trust the plan, /build auto implements every task after a single plan approval. Be clear about what that means: it removes the stepping between tasks, not the verification. It still s on failures and risky steps.
/test
Run it before you merge. When you want a review pass, the repo also has /review (in Claude Code use /agent-skills:review, because a built-in command shares the name) and /code-simplify for anything that came out too clever.
"Using addyosmani/agent-skills, run /spec for , then /plan, and show me the plan. After I approve, implement it with /build one slice at a time, test-driven, committing each task, and stop on any failing test."
Step-by-step card: Go from idea to tested feature with /spec, /plan and /build. Everything else people do with this repo: agent-skills use cases. For the wider category, see AI use cases for Cursor.
Source repo: addyosmani/agent-skills.
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