I asked my agent to fix one thing. A small bug, one function, clearly scoped. It came back in under a minute with a clean change and a confident summary. The bug was gone. I moved on. Two days later a feature I had not touched in weeks stopped working. Most of a day went into tracing it. The cause was the same change. While fixing the one function I pointed at, the agent had quietly adjusted four other things around it, and one of those adjustments broke a path nobody was looking at. Here is the opinion I will defend in the comments. Typing the code was never the expensive part of software. AI made the cheap part free, and left the entire expensive part sitting on me. Writing the change is cheap. Knowing the change is correct, and knowing it did not quietly break something you were not watching, is the part that costs. For years those two costs traveled together. If you wrote the code, you had at least held the surrounding logic in your head while you did it. Writing was also reasoning.…