Fix bugs with tests that fail before the fix.
Guides bug fixes with focused regression checks that demonstrate failure before the fix and success afterward when practical.
When to use it
Use when the user explicitly requests TDD, a failing test, or a regression test, or when a bug has an obvious cheap local test target; skip unclear, expensive, or integration-heavy test paths.
It changes how the agent fixes bugs by requiring a focused failing-before test and passing-after verification when a practical test path exists.
What you provide
No setup requirements listed.
No additional actions listed.