A few things that were interesting to figure out: you can get very close to Excel with just Univer free license, the most material missing elements are charts (existing charts kept but not displaying in the view) and pivot tables. Rust + cutting down on tools available to the model (basically just web fetch + talk to user + excel operations) improves the speed materially. SpaceX model built in 2 min 30s, compared to ~5 min for Excel plug in. Working next on improving the agent efficiency for multi-sheet work + context compacting for longer sessions.

Repo: https://github.com/pixelsmasher13/gridpath Site: https://gridpath.dev Feedback welcome!