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.claude/skills/test-driven-development/SKILL.md

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+---
+name: test-driven-development
+description: Enforce RED→GREEN→REFACTOR micro-cycles and keep diffs minimal
+version: 0.1.0
+tags: [testing, quality]
+triggers:
+  - tdd
+  - tests first
+  - failing test
+---
+
+# Test-Driven Development
+
+## Purpose
+Bias implementation to tests-first and small, verifiable changes.
+
+## Behavior
+1. RED: scaffold 1–3 failing tests targeting the smallest slice.
+2. GREEN: implement the minimum code to pass.
+3. REFACTOR: improve names/structure with tests green.
+4. Repeat in tiny increments until task acceptance criteria are met.
+
+## Guardrails
+- Block large edits unless a failing test exists.
+- Prefer small diffs spanning ≤3 files.
+- Keep test names explicit and deterministic.
+
+## Output Style
+- `bullet-points` for steps; `markdown-focused` for code blocks.
+
+## Integration
+- `/lazy task-exec` implementation phase; Coder/Tester agents.
+
+## Example Prompt
+> Apply TDD to implement input validation for prices.
+