It gives you book recommendations based on ✨vibes. ✨ You enter a search query like "funny scifi" and it returns a list of (hopefully!) good recommendations.
Just tried it. I put in the title of some caveman smut book and it gave me back a Ben Shapiro book on mammoth cloning, the other books in that caveman smut book series, and a book about a guy with a cybernetic eye.
It's a neat idea, but seems limited. Returns the same results each search.
For example: funny sci-fi fails to return Hitchhiker's Guide to the Galaxy, but does include "I Have No Mouth and I Must Scream" which is the polar opposite of funny.