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This skill provides a rigorous framework for Test-Driven Development (TDD) within Claude, centered on the 'Iron Law' that no production code should exist without a preceding failing test. It guides users through the mandatory cycle of writing a minimal failing test, verifying the failure, implementing the simplest code to pass, and refactoring for cleanliness. By eliminating common rationalizations for skipping tests, this skill helps developers build high-confidence features, reproducible bug fixes, and maintainable architectures while ensuring that every line of code serves a verified purpose.
