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tdd-vertical-slices

Test-driven development with vertical-slice red-green-refactor cycles. Use when applying TDD to a new feature or bug fix, when user mentions 'red-green-refactor', 'tdd', 'test-first', 'vertical slice' — explicitly avoids the 'horizontal slicing' anti-pattern (write all tests first, then all code) which produces brittle implementation-coupled tests.

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UpdatedJune 7, 2026 at 21:54
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