Reproduce

Verify behavior with automation, APIs, logs, and data checks before opening browser DevTools.

The Reproduce-First Loop

The canonical sequence for any bug fix:

1. Reproduce: write a failing test (or deterministic probe) that captures the buggy behavior.
2. Fix: implement the minimum change that makes it pass.
3. Verify no regression: run the nearest related suite.

Strong success criteria let the loop run without constant clarification. "Make it work" is not a success criterion — the failing test is. If you can't write a failing check first, you don't yet understand the bug well enough to fix it.

Rules