alt Hacker News> I do think there's a bit of an experience divide here, where people more experienced have been down the path of a codebase degrading until it's just too much to salvage – so I think that's part of why you see so much pushback.
When I look back over my career to date there are so many examples of nightmare degraded codebases that I would love to have hit with a bunch of coding agents.
I remember the pain of upgrading a poorly-tested codebase from Python 2 to Python 3 - months of work that only happened because one brave engineer pulled a skunkworks project on it.
One of my favorite things about working with coding agents is that my tolerance for poorly tested, badly structured code has gone way down. I used to have to take on technical debt because I couldn't schedule the time to pay it down. Now I can use agents to eliminate that almost as soon as I spot it.
I've used Claude Code to do the same (large refactor). It has worked fairly well but it tends to introduce really subtle changes in behaviour (almost always negative) which are very difficult to identify. Even worse if you use it to fix those issues it can get stuck in a loop of constantly reintroducing issues which are slightly different leading to fixing things over and over again.
Overall I like using it still but I can also see my mental model of the codebase has significantly degraded which means I am no longer as effective in stopping it from doing silly things. That in itself is a serious problem I think.