Scaffold with TDD
Lock behavior with tests before writing the implementation.
The prompt
Write failing tests for <behavior> first and show them to me. Once I confirm, implement until they pass. Don't modify the tests without asking.Why it works
Tests-first gives the model an executable definition of “done” and a tight feedback loop. The “don’t modify the tests” rule stops it from quietly weakening the spec to make things pass.
Fill in
<behavior>— the behavior to specify, with example inputs/outputs.
Follow-ups
- “All green — now refactor the implementation, keeping tests untouched.”