I really hate to say it, but at least on a test project, this Xcode 26.3 coding agent stuff is pretty good. I can see why some are going gaga over it.
My main concern (other than copyright, which for some reason companies seem to ignore) is that it makes it to easy to just trust the generated code. You start reading things line by line and after a few minutes its hard not to skim over the suggested bits that get added.