tdd
TDD Skill
Write the test first. Watch it fail. Write minimal code to pass.
The Iron Law
No production code without a failing test first.
Every line of production code must be justified by a test that failed without it. No exceptions. No shortcuts. No "I'll test after."
Agent Workflow
1. DETECT -> Identify stack, test framework, existing test patterns
2. RED -> Write ONE failing test for the next behavior
3. VERIFY -> Run test, confirm it fails for the EXPECTED reason
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