Reviewing agent-written code is risk management rather than reading: how long the change took and how big it is tell you when to look closely.

Part of it is just like you develop a little bit of a feeling how long something should take. So if I do a small tweak that should like change how dragging works and it takes three hours, I know something's wrong. I'll look closely. But otherwise, part of code review is simply like observing, looking how big it changes and trusting your gut.