It's basically a fancy context aware ctrl-f to the book.
I use this regularly with RPG manuals. I _know_ the stuff, but don't remember every detail by heart. And just ctrl-f:ing through a Mörk/Pirate Borg -style PDF isn't really productive (they're "artistically" laid out). But I can just ask an AI bot that has the pdf indexed like "how does the medical kit work?" and it'll give me a summary along with the relevant rolls within seconds.
Most likely about three billion - all vibe coded and most of them with super pretty domain names and launch pages :D
The only complicated bit is the PDF indexing. I would personally suggest using a proper cloud model in a massive datacenter to do it if the source is even a bit fuzzy. (lots of tables, fancy layouts etc). A "normal" PDF can just be converted to markdown in seconds.
After that the local stuff can be managed by any local model that has a tool to use bash or read files.
I have a Discord bot that can ingest a RPG PDF and stores it in a sqlite vector database for search, took me maybe an evening to build it with Claude.
I use this regularly with RPG manuals. I _know_ the stuff, but don't remember every detail by heart. And just ctrl-f:ing through a Mörk/Pirate Borg -style PDF isn't really productive (they're "artistically" laid out). But I can just ask an AI bot that has the pdf indexed like "how does the medical kit work?" and it'll give me a summary along with the relevant rolls within seconds.