I did something similar to this for all the Cosmere stuff. I wanted to be able to find answers but only with the information I had read been exposed to so far. I didn't want to risk going to the wiki and getting spoilers for things I haven't read yet. It wasn't anything fancy, it was just giving the agent access to all the text I had read up to my current chapter. Probably too much context for it to handle efficiently - would be awesome to take it one step further and do it proper