Technically speaking: it can't, any more than it can actually answer any other thing you ask it to do.

But in practice it does produce fairly reasonable output fairly often, and if you've been there watching and correcting it you can probably validate the result quite easily. "Re-read everything before" and similar are definitely anthropomorphizing, but that doesn't mean they're ineffective.

It can easily detect repeated failed attempts at a non obvious problem such as incorrect documentation or missing run flags

Why wouldn’t it?