Ironically, I find LLMs far better at helping me dive into unfamiliar code than at writing it.

A few weeks ago a critical bug came in on a part of the app I’d never touched. I had Claude research the relevant code while I reproduced the bug locally, then had it check the logs. That confirmed where the error was, but not why. This was code that ran constantly without incident.

So I had Claude look at the Excel doc the support person provided. Turns out there was a hidden worksheet throwing off the indices. You couldn’t even see the sheet inside Excel. I had Claude move it to the end where our indices wouldn’t be affected, ran it locally, and it worked. I handed the fixed document back to the support person and she confirmed it worked on her end too.

Total time to resolution: 15 minutes, on a tricky bug in code I’d never seen before. That hidden sheet would have been maddening to find normally. I think we might be strongly overestimating the benefits of knowing a codebase these days.

I’ve been programming professionally for about 20 years. I know this is a period of rapid change and we’re all adjusting. But I think getting overly precious about code in the age of coding agents is a coping mechanism, not a forward-looking stance. Code is cheap now. Write it and delete it.

Make high leverage decisions and let the agent handle the rest. Make sure you’ve got decent tests. Review for security. Make peace with the fact that it’s cheaper to cut three times and measure once than it used to be to measure twice and cut once.