How does TDD improve AI-generated code?

TDD forces the AI to define the API and desired behavior before implementation, which prevents the AI from hallucinating or over-complicating the solution beyond the actual requirements.

Can I use this for bug fixes?

Yes. The skill mandates writing a failing test that reproduces the bug before any fix is applied, ensuring the bug is truly understood and won't reappear in the future.

Why does the skill insist on watching a test fail?

Watching a test fail confirms that the test is actually evaluating the intended behavior and is capable of catching the specific issue. A test that passes immediately proves nothing about its own effectiveness.

What is the 'Iron Law' in this TDD skill?

The Iron Law states that no production code can be written without a failing test first. If production code is written before a test exists, it must be deleted and restarted to ensure the test is valid.

Does this skill allow for exceptions to TDD?

Exceptions are only suggested for throwaway prototypes, generated code, or simple configuration files, and typically require explicit permission from the human partner.

Test-Driven Development (TDD)

Name: Test-Driven Development (TDD)
Author: dazeb

bydazeb

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セキュリティとテスト

Enforces a strict Red-Green-Refactor workflow to ensure high-quality code through mandatory test-first implementation.

This skill transforms Claude into a disciplined TDD practitioner by enforcing the 'Iron Law': no production code is written without a failing test first. It guides the AI through the rigorous cycle of writing minimal failing tests, verifying the failure reason, implementing the simplest possible passing code, and refactoring while maintaining a 'green' state. By preventing shortcuts and rationalizations, it ensures that every line of code is purposeful, verified, and documented through automated tests, significantly reducing technical debt and production bugs.

主な機能

01Strict Red-Green-Refactor cycle enforcement

02Support for bug reproduction through regression test cycles

03Minimalist code implementation to prevent over-engineering

04Mandatory verification of test failure messages before implementation

054 GitHub stars

06Automated guidance on avoiding common TDD rationalizations

ユースケース

01Safely refactoring complex legacy systems by maintaining a continuous green state

02Implementing new features with 100% logic coverage from the start

03Reproducing and fixing software bugs by first creating a failing regression test

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add dazeb/claudeplaybook test-driven-development

For use in Claude.ai and ChatGPT

Download Skill