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tdd

Test-Driven Development enforcer. Red→Green→Refactor cycle with no production code without a failing test first. Use for new features and bug fixes.

plugins/epicsagas/epic-harness/skills/tdd/SKILL.md

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# TDD — Test-Driven Development

## Iron Law

NO PRODUCTION CODE WITHOUT A FAILING TEST FIRST. Violating the letter of this process is violating the spirit of this process.

## Process

### Red → Green → Refactor

1. **Red**: Write a failing test that describes the desired behavior
   - Test name should read like a spec: `it("returns 401 when token is expired")` (reason: the test name IS your specification — it must communicate intent to future readers)
   - Run the test — confirm it fails for the right reason (reason: a test that fails for the wrong reason gives false confidence)