Can Claude merge CSV files into one?
Not on its own. a chat AI can't run programs or write files on your computer. With the GUI Hub Data MCP server installed, Claude (Desktop or Code), Cursor, VS Code and other MCP clients can combine many CSV files locally: the assistant calls the duckdb_combine tool, which runs DuckDB on your machine. Files are not uploaded.
Set it up (2 minutes)
- Claude Code / Cursor / VS Code / Windsurf: add the MCP server
npx -y https://guihub.cc/mcp.tgz --product=data
Claude Code:claude mcp add gui-hub-data -- npx -y https://guihub.cc/mcp.tgz --product=data - Claude Desktop: download the one-file extension and double-click it.
- No AI? GUI Hub Data is also a point-and-click desktop app.
Then ask
“Combine all the CSVs in ~/Exports into one Excel file.”
What the AI gets
duckdb_combine — Combine several local CSV files into one file (rows stacked, columns matched by name; missing columns become empty). Output format CSV, Excel, Parquet or JSON.
| Input | Type |
|---|---|
| inputs* | array |
| format | string (xlsx, HEADER true, csv, HEADER true, parquet, json, ARRAY true) |
| out* | string |
Cost
Free to install; each tool has 3 free uses. Then $9 once for all of GUI Hub Data (no subscription). The tool tells the assistant when free uses run out and how to unlock.
Powered by DuckDB (MIT), the official release, verified by SHA-256. GUI Hub is independent and not affiliated with DuckDB, Anthropic, Cursor or Microsoft.
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