# Go from idea to tested feature in Claude Code or Cursor with /spec, /plan and /build

> Source: <https://dev.to/dedupedai/go-from-idea-to-tested-feature-in-claude-code-or-cursor-with-spec-plan-and-build-376d>
> Published: 2026-11-02 20:07:32+00:00

Agents are fast at writing code and equally fast at writing the wrong code. [addyosmani/agent-skills](https://github.com/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 pauses 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](https://dedupedai.com/use-cases/addyosmani-agent-skills/spec-plan-build-a-feature-with-agent-skills/?utm_source=devto&utm_medium=article&utm_campaign=howto_agentskills). Everything else people do with this repo: [agent-skills use cases](https://dedupedai.com/use-cases/addyosmani-agent-skills/?utm_source=devto&utm_medium=article&utm_campaign=howto_agentskills). For the wider category, see [AI use cases for Cursor](https://dedupedai.com/use-cases/a/cursor/?utm_source=devto&utm_medium=article&utm_campaign=howto_agentskills).

Source repo: [addyosmani/agent-skills](https://github.com/addyosmani/agent-skills).

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