I think a lot of the telltale signs of AI can be found in the comments. Besides the slop writing style, I've found AI comments to 1. be overly verbose, 2. unnecessarily describe before/after code state (# This function used to do foo, but now it does bar), and 3. reference its own internal "plan" (# This function is part of Stage 3 of the implementation of Use Case X from the requirements doc) WTF is Stage 3? - says code reader 2 years from now. Although I bet you can probably prompt these behaviors away.