This drops DuckDB into Claude's filesystem to run SQL queries against your Excel and CSV uploads. You get schema inspection, aggregation, joins across multiple files, and exports to CSV, JSON, or Markdown. The workflow is straightforward: inspect to see what columns you're working with, then write SQL like you're querying a database. It handles multi-sheet workbooks, each sheet becomes a table you can join against. Honest take: if you're already thinking in SQL, this is faster than wrestling with pandas syntax or manually pivoting in Excel. For non-technical users asking data questions, it gives Claude the tooling to actually compute answers instead of just talking about them.
npx skills add https://github.com/bytedance/deer-flow --skill data-analysis