Fictional Fans

What's the setup? What's the vibe?

Well put.

An alternative is to include a quote and a prompt/basic description of the setup.

Yes, that's a good way to cover your bases.

I passed over sooooo many fics on FF.net where there's no tagging because of their uninformative summaries...

When the summary is unhelpful the tags can be a good alternative. But I have found I am more likely to skip stories when I see their tags. Especially for kink-fic or PWPs, I get using very specific tags -- you're finding your audience. But I daresay I have skipped right over stories I might otherwise have liked because you are telling me way too much about the sex scenes (which I'm probably not going to read anyway).