io.github.geniuskey/mcp-server-xlwings

mcp-server-xlwings

MCP server for Excel automation via xlwings COM. Works with DRM-protected files.

Why xlwings?

Libraries like openpyxl or pandas read .xlsx files directly from disk. This fails when:

• DRM / file-level encryption is applied (common in enterprise environments)
• You need to interact with a live Excel session (formulas, macros, add-ins)
• Files are locked by another process

mcp-server-xlwings uses COM automation to talk to the running Excel process, so it can read and write any file that Excel itself can open -- including DRM-protected documents.

xlwings-exclusive capabilities

These features are impossible with file-based libraries like openpyxl:

• Read the user's current selection -- see exactly what the user is looking at
• Get the active workbook -- no need to specify a file path
• Run VBA macros -- execute existing macros and get their return values
• Live formula results -- set a formula and get the calculated value immediately
• Force recalculation -- trigger Excel to recalculate all formulas

Installation

With uvx (recommended)

uvx mcp-server-xlwings

With pip

pip install mcp-server-xlwings

Configuration

Claude Desktop

Add to %APPDATA%\Claude\claude_desktop_config.json:

{
  "mcpServers": {
    "xlwings": {
      "command": "uvx",
      "args": ["mcp-server-xlwings"]
    }
  }
}

Claude Code

claude mcp add xlwings -- uvx mcp-server-xlwings

Roo Code (VS Code)

Add to Roo Code MCP settings or create <project-root>/.roo/mcp.json:

{
  "mcpServers": {
    "xlwings": {
      "command": "uvx",
      "args": ["mcp-server-xlwings"]
    }
  }
}

Cursor

Add to %USERPROFILE%\.cursor\mcp.json:

{
  "mcpServers": {
    "xlwings": {
      "command": "uvx",
      "args": ["mcp-server-xlwings"]
    }
  }
}

Windsurf

Add to %USERPROFILE%\.codeium\windsurf\mcp_config.json:

{
  "mcpServers": {
    "xlwings": {
      "command": "uvx",
      "args": ["mcp-server-xlwings"]
    }
  }
}

Continue (VS Code)

Add to ~/.continue/config.yaml:

mcpServers:
  - name: xlwings
    command: uvx
    args:
      - mcp-server-xlwings

Available Tools (11)

All tools default to the active workbook when workbook is omitted.

Examples

See what the user is working on

"What's in the spreadsheet I have open?"

The agent calls get_active_workbook() to get the workbook name, sheets, and selection data, then read_data() to fetch the full sheet.

Summarize selected data

"Summarize the data I've selected"

The agent calls get_active_workbook() -- the response includes the selection data directly.

Run a macro

"Run the UpdateReport macro"

The agent calls run_macro(macro_name="UpdateReport") and returns the result.

Build a summary row

"Add a SUM formula in C10 that totals C2:C9"

The agent calls write_data(start_cell="C10", formula="=SUM(C2:C9)") and gets back the calculated value.

Format a header row

"Make row 1 bold and centered with a yellow background"

The agent calls format_range(cell_range="A1:D1", bold=true, alignment="center", bg_color="#FFFF00").

Read all sheets at once

"Give me a summary of every sheet"

The agent calls read_data(sheet="*") -- returns all sheet summaries in a single call.

Read merged cells properly

"Read B6:C20 and fill in merged cell values"

The agent calls read_data(cell_range="B6:C20", merge_info=true). Merged cells return the parent value instead of null.

Find all formulas

"Show me all formulas in this sheet"

The agent calls get_formulas(cell_range="A1:Z100", values_too=true) and gets every formula with its calculated value.

Insert rows

"Insert 3 blank rows at row 5"

The agent calls manage_sheets(action="insert_rows", position=5, count=3).

Requirements

• Windows (Excel COM automation is Windows-only)
• Microsoft Excel installed
• Python 3.10+

License

MIT