Claude Code Tutorial: Build Your First Skill in 10 Minutes

Building a custom Claude skill enables a strict test-driven development (TDD) workflow by forcing the AI to adhere to the red-green-refactor cycle. This process involves creating a dedicated folder within a `.claud/skills` directory and defining a `skill.md` file with YAML front matter that specifies the skill's name and a trigger description. The core logic instructs Claude to write the simplest possible failing test, generate minimal code to pass, and verify results before refactoring. A practical demonstration using a GitHub repository name validator shows how this skill prevents the AI from writing entire test files upfront or implementing multiple features simultaneously. By following these constraints, the workflow generates comprehensive documentation through a robust test suite and ensures that every piece of functionality is verified through discrete, incremental steps.