Hook

TDD Guard

TDD Guard enforces test-driven development in Claude Code.

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Checked 2026-10-31

TDD Guard enforces test-driven development in Claude Code. When the agent tries to write implementation without a failing test, or to write more than the current test needs, TDD Guard blocks the action and explains what to do. It also uses your lint rules to push refactoring, lets you adjust the rules, and can be switched on or off mid-session. It supports test frameworks including Vitest, Jest, Storybook, pytest, PHPUnit, Go, Rust, RSpec and Minitest. Install with /plugin marketplace add nizos/tdd-guard, then /plugin install tdd-guard@tdd-guard, then /tdd-guard:setup. It needs Node.js 22 or later. The licence is MIT, the maintainer is Nizar Selander, and the repository was last pushed on 26 October 2026. The README says the project grew into Probity, which also covers Codex and Copilot CLI, and that new projects should start there. TDD Guard remains maintained for existing users. We have not run it ourselves for this note.

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Questions

How do I install TDD Guard?

Run this command: /plugin marketplace add nizos/tdd-guard. The install box on this page has the command for each agent it works with.

Is TDD Guard free?

It is published under the MIT licence.

Who maintains TDD Guard?

It is maintained by Nizar Selander. The code is at github.com/nizos/tdd-guard.

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  • Test Writer Subagent

    • By AI Agent Duo

    Tested with Claude Code 2.1.316 (Sonnet), 2026-10-31, sample project, invoked through the main session

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