spec-first

Open-source spec-first method and Claude Code plugin for AI coding agents. Four commands write a spec from your description, have a fresh agent review it against the code, build it in its own git worktree with the tests the spec names, and open a pull request only after build and tests pass. Specs, decisions and memory are plain YAML and Markdown in your repo, and it also works with Cursor or other IDE agents.

Use case

AI coding agents

Pricing tier

Free

Pricing note

Free and MIT licensed.

Skill level*

Intermediate

License

MIT

Added

2026-10-28

Sources checked

• spec-first.dev/
• github.com/holgerleichsenring/specification-first-agentic-development
• news.ycombinator.com/item?id=50260571

* Skill level and vibe badges are our own editorial labels. Pricing and plans change often; always confirm on the official site. Last checked 2026-10-27.