You paste the stack trace. Claude gives you a fix. It works. You ship it and close the ticket.
Three weeks later a different pipeline throws a different error, and you spend two hours on it before realising it's the same problem you already solved.
This is one of the most common ways AI assistance quietly fails engineers early in their careers, and it doesn't look like failure at any point. Every individual interaction went well. The fix was correct. The ticket closed. The cost lands weeks later, somewhere that looks unrelated.
A fix and a principle are two different things, and only one of them transfers.
Consider a timestamp parsed without timezone information. The symptom is dates landing a day earlier than the source system reports them. Ask for a fix and you'll get one: an explicit UTC conversion at parse time. Correct, minimal, ships clean.
