TDD: Test-Driven Development Overview Use this skill to drive one concrete behavior into existence through a focused test-first cycle. The cycle is: The test is evidence only when it observes the promised behavior at the right boundary and can fail for a meaningful defect. A green test is evidence only when its oracle proves the requirement rather than an implementation shape. This method is framework-neutral. Identify the repository's test tooling and delegate its commands and mechanics to the applicable project skill. When to Use Use this skill for: - new behavior and feature work; - bug fi…