I've been pretty curious to see if I can help reduce LLM hallucinations by giving LLM's more deterministic tools. My current attempt is something like the old StatWing but instead of a GUI, it has an mcp interface for LLM's. A demo, with very limited llm budget and might run out if heavily used, is at https://statimedes.com. I haven't built the GUI to upload a random csv's, but I did load the Telco churn data I found on Kaggle.

I've also experimented with the Brazil purchase data from Olist. That was pretty fun because it has more than on csv. The tool managed pretty well and was able to come to statistically correct conclusions.