tdd
Invocation points:
- Task plan calls out behavior with a clear external contract (pure function, API endpoint, module boundary)
- Bug fix — write the failing repro test first, then fix
- Refactor into a new module — write the tests against the new interface first
Do not use this skill for:
- Exploratory spikes (use
/gsd start spike— no production code ships) - Pure UI polish where visual verification beats unit tests
- Scripts that run once and are deleted
<core_principle>
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5