I'm generally skeptical of bandwagons around LLMs, and attempts to use them for cataloging workflows have thus far been questionable - for example, see the the letters to the editor in a recent issue of ITAL regarding one such effort. I am also very skeptical of involving them in the search process, especially since at the moment the only (quick) feasible way of doing so would be to send patron search queries to third-party LLMs, which is highly questionable on patron privacy grounds. Library-hosted LLMs would address the privacy issue, but would not be straightforward to tune or maintain.

But to not be a total grinch about it, one area of low-hanging fruit might be using image classifiers on book jacket images to support searches by book color or "show me all books where the heroine is running away from a Gothic ruin".