A week or two back there was a post on Reddit where someone was advertising a project they'd put up on GitHub, and when I went to look at it I didn't find any documentation explaining how it actually worked - just how to install it and run it.

So I gave Gemini the URL of the repository and asked it to generate a "Deep Research" report on how it worked. Got a very extensive and detailed breakdown, including some positives and negatives that weren't mentioned in the existing readme.