What's the best tool for offline Wikipedia RAG at the moment?

Theoretical use case: I have a compressed version of wikipedia, and some function or tool fooRAG. Then I set my system prompt (or make a skill, or hook, etc.) to include "You can search wikipedia with the fooRAG tool like so...". Then in whatever harness I'm using I ask Qwen "List every character in the play Hamlet", and it uses the tool to pull and read the wikipedia page for Hamlet. So far I've just found abandoned projects— this is the sort of question that's good to poll the community for. Definitely something I might take a crack at if there aren't good options available...