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Before fixing any bug, write a test that reproduces it and watch it fail. Use for every bug fix.
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Based on SOC occupation classification
Review a diff against the goal spec assuming the code is BROKEN. The reviewer that lives in the maker's head always agrees with itself — this pulls review into a hostile, separate pass. Invoke after every code change before marking work done.
Verify that an endpoint checks ownership, not just authentication. Use on any handler that reads or mutates user data.
Find the exact commit that introduced a bug. Use when something worked before and broke, and you don't know which change did it.
Turn a set of commits or a diff into a clean, user-facing changelog entry. Use before a release or PR description.
Turn messy WIP into clean, atomic commits with messages that explain why. Use before opening a PR.
Keep the agent's context lean so accuracy doesn't collapse. Use on long sessions, big files, or when the agent starts hallucinating.
| name | write-failing-test-first |
| description | Before fixing any bug, write a test that reproduces it and watch it fail. Use for every bug fix. |
| when_to_use | fixing a bug, "make X work", a reported defect |
The only proof you fixed a bug is a test that failed before and passes after.
