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This skill transforms Claude into a disciplined TDD practitioner, strictly adhering to the 'Iron Law' that no production code should be written without a preceding failing test. It guides the development process through a mandatory cycle: writing a minimal failing test, verifying the failure, implementing the simplest code to pass, and refactoring for quality. By mandating that users see a test fail before it passes, the skill eliminates technical debt and ensures every line of code is verified, resulting in robust, maintainable, and self-documenting software architectures.
