[efskap]

Makes sense that the agent can refine its search terms/strategy based on discovered context.

But it still has to enumerate synonyms to find things.

I would assume it's very domain dependent, like code or technical docs would have more precise terminology that is better for fixed string search. On the other hand, medical or legal text can have many many ways to say something

[soco]

Yup, and good luck finding usable dictionaries. It's a lot of one-time handiwork to build it yourself, for which you need to find the right motivation (and time, and funding)