Question
An AI agent changed the default timezone handling in a shared `formatTimestamp` utility to fix a bug where one customer saw times in UTC instead of their local zone. The targeted bug is fixed. This utility is imported by 40+ modules across billing, notifications, audit logs, and analytics. How do you confirm the change didn't silently break adjacent features — and what's the trap of relying on the test suite passing?
Treat the AI’s output as a draft to verify, not an answer to trust. Name the specific flaw and the input that triggers it, say how you’d catch it — tests, edge cases, reading critically — and how you’d re-prompt or decompose to get it right.
Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.