For personal projects, it depends on how important they are. My time tracking and invoicing software, all of it. The app that archives and serves my podcast library, none (it’s written in a language I have never worked with).

For client work, a similar split. Simple UI fixes, I give it a scan. A feature that will have to be supported indefinitely, I’ll spend a few days on it making sure I really understand it. It’s not really a fair comparison though because by the time I get to a serious review I’ve already done multiple iterative sessions planning and architecting with the LLM then approved each commit as it has gone in.

I’m conflicted though. For sure I don’t have as good a grasp of my own codebase as I did when I wrote every line. I think I’m ok with that though.