| name | jb-tdd |
| description | Use when the user asks for TDD, red-green-refactor, tests-first implementation, or a bug fix/feature with tests first. |
TDD (Red-Green-Refactor)
Use this skill whenever you need reliable, incremental implementation with test-first development.
When to use
- Building new behavior where correctness matters
- Fixing bugs with a reproducible failing test
- Refactoring safely with behavior locked by tests
- Working in codebases where regression risk is high
Workflow
-
Red
- Write or update a test that describes the intended behavior.
- Run tests and verify the new/changed test fails for the right reason.
-
Green
- Implement the smallest possible code change to make the failing test pass.
- Run the smallest relevant test scope first, then broader tests.
-
Refactor
- Improve naming, remove duplication, simplify logic.
- Keep behavior unchanged and run tests again.
-
Repeat
- Continue in small cycles until acceptance criteria are complete.
Guardrails
- Never skip the failing test step.
- Keep each cycle small and reviewable.
- Prefer deterministic tests over timing/network fragile tests.
- If behavior is unclear, stop and ask for clarification before coding.
Deliverables
- Final passing tests for all new/changed behavior
- Minimal implementation changes
- Brief summary of what each red-green-refactor cycle achieved
