Is this skill compatible with my existing testing framework?

Yes, the test-first methodology is framework-agnostic and can be applied to any testing suite Claude supports, such as Jest, Pytest, or Vitest.

How does this skill prevent AI from 'cheating' or overfitting to tests?

It utilizes independent subagent reviews to inspect the code for magic numbers or hardcoded logic that only serves to pass the specific test cases provided.

What is the benefit of writing tests first with Claude?

Writing tests first provides Claude with a definitive success criterion, allowing it to use test failures as a feedback loop to refine its implementation autonomously.

When should I trigger the Test-First skill?

You should use it whenever you are starting a new feature or addressing a bug, especially when the logic is complex enough to require multiple edge-case validations.

Test-First Development

Name: Test-First Development
Author: rahulsub

byrahulsub

•

Security & Testing

Implements Test-Driven Development patterns to enable LLM self-correction and autonomous iteration through feedback loops.

The Test-First Development skill optimizes Claude's coding workflow by enforcing a rigorous TDD cycle: writing failing tests, implementing minimal code to pass, and refactoring for quality. By establishing success criteria before writing implementation logic, it creates a structured feedback loop that allows the LLM to verify its own work and correct errors autonomously. Crucially, it incorporates independent subagent verification to prevent 'overfitting'—a common AI pitfall where code is written to pass specific tests without addressing broader business requirements—ensuring production-ready, generalized logic for both new features and bug fixes.

Key Features

01Edge case and error handling coverage checklists

02Automated TDD workflow (Red-Green-Refactor loop)

03LLM self-correction based on test execution feedback

041 GitHub stars

05Independent subagent verification to prevent test overfitting

06Verification patterns for complex business logic

Use Cases

01Refactoring existing codebases while ensuring functional parity

02Implementing new features with complex logic and strict requirements

03Reproducing and fixing bugs by creating regression tests first

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add rahulsub/code-practices-plugin test-first

For use in Claude.ai and ChatGPT

Download Skill