Test Driven Development

This consolidates TDD patterns into a single reusable skill so you don't need to repeat testing guidance across multiple agents. It covers the red-green-refactor cycle, test structure patterns like AAA and Given-When-Then, and language-specific examples for Python, JavaScript, and Go. The naming conventions and mock patterns are solid reference material. Most useful when you're setting up a new project or want consistent testing practices across a codebase. The anti-patterns section is honest about common mistakes like testing implementation details or running slow tests in your unit suite. Saves you from writing the same 500 lines of testing docs every time you spin up a new agent.