Why does the skill make me write 'minimal' code?

Writing only enough code to pass the current test prevents over-engineering and ensures that every piece of logic in your codebase is explicitly required by a test case.

What happens if I write code before a test using this skill?

The TDD skill enforces a strict 'Iron Law'—if production code is written before a failing test, the skill will instruct you to delete the code and start the cycle over correctly.

Does this skill work with my existing test runner?

Yes, it is designed to integrate with standard commands like 'npm test' or other language-specific frameworks to verify test failures and successes.

Can I skip the refactoring phase?

The skill discourages skipping refactoring to prevent the accumulation of technical debt. It mandates a cleanup step after every green phase to keep the codebase healthy.

Test-Driven Development (TDD)

Name: Test-Driven Development (TDD)
Author: Yeachan-Heo

byYeachan-Heo

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3,720

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Security & Testing

Enforces a strict Red-Green-Refactor workflow by requiring failing tests before any production code implementation.

The TDD skill transforms Claude into a disciplined development partner that adheres to the 'Iron Law' of software engineering: no production code is written without a preceding failing test. By guiding users through the Red-Green-Refactor cycle, this skill ensures that every line of code serves a specific requirement, prevents feature creep, and maintains high code quality through mandatory refactoring phases. It is ideal for developers who want to eliminate technical debt and ensure 100% functional coverage from the very first line of a project.

Key Features

01Structured TDD reporting for clear visibility of development progress

023,720 GitHub stars

03Strict Red-Green-Refactor cycle enforcement

04Automated 'Iron Law' validation to prevent code-first development

05Minimal implementation guidance to focus on passing specific tests

06Mandatory refactoring steps to maintain code cleanliness

Use Cases

01Refactoring complex legacy systems by wrapping functionality in tests first

02Building mission-critical features requiring high reliability and test coverage

03Onboarding developers to TDD best practices through guided AI pair programming

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add yeachan-heo/oh-my-claudecode tdd

For use in Claude.ai and ChatGPT

Download Skill