Claude Code is an agentic coding tool that edits files, runs commands and turns issues into pull requests, covering the AI coding agent job that spec-first guides.
Paid plans: see official pricing
AI tool
spec-first
spec-first guides AI coding agents through reviewed specs, isolated worktrees and gated commits before pull requests open.
What spec-first does
It has an agent write a spec for a feature before any code is built. A separate reviewer agent checks the spec against the existing code. Commits only go through when build and tests pass, then a pull request is opened.
Built for
- Developers working with AI coding agents
Key features
- Writes specs with goal, facts, steps and done criteria
- Checks that cited files and lines exist
- Fresh agent reviews spec against the code
- One branch and worktree per spec
- Commit gate runs build and tests before committing
- Logs design decisions to decisions files
- Series of specs delivered as one pull request
Pros
Pros
- Records the reasons behind design choices alongside the code.
- Works with several AI coding agents through shared repository files.
Where spec-first is listed
spec-first is listed under AI coding agents in AI coding tools.
See MCP servers for coding and Claude skills for coding.
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spec-first alternatives
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Devin is an autonomous coding agent that builds, tests and delivers pull requests in the cloud or on your machine.
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