Write tests first, make them pass, then refactor — a strict Red-Green-Refactor loop with typed stubs, coverage gates, and the Matt Pocock / Kent Beck discipline.
Enforces a true test-driven development loop on any coding task: writes failing tests from the spec, generates the minimal implementation to make them pass, refactors with safety net in place, and enforces coverage thresholds before marking done. Integrates with Vitest, Jest, pytest, and Go test. Produces typed mock stubs, factory helpers, and a fixture directory. Named for the Matt Pocock TDD approach popularised across skills.sh — one of the top-installed coding discipline skills with 116K+ installs.
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