Build features with tests that prove they work.
Implements features through a test plan, failing tests, minimal code, and full-suite validation.
When to use it
Use for test-first feature development, coverage-critical features, and bug fixes requiring regression tests.
Give it a feature to implement in a project; it produces tests and minimal implementation code, then validates the full test suite.
What you provide
No setup requirements listed.
This skill
implementation code
Deletes code written before tests (irreversible)