MCP LibreOffice Calc

MCP server for controlling LibreOffice Calc workbooks through UNO.

This project focuses on reliable spreadsheet operations against an already-open workbook, or a workbook opened explicitly by the server. It avoids silent file rewrites outside LibreOffice and provides practical tools for writing cells, ranges, hyperlinks, and reusable visual templates.

Demo

The demo shows the create_gpu_purchase_dashboard_live tool rebuilding the dashboard from scratch through UNO: creating the sheet, styling and filling each section live, and adding native Calc charts, so every change is visible in LibreOffice.

A higher-quality version is available at assets/demo.mp4.

Related MCP server: Excel MCP Server

Available Tools

• libreoffice_status: check the UNO connection and list reachable Calc workbooks.

• open_calc: open a Calc or Excel workbook through LibreOffice.

• ensure_calc_document: reuse an already-open workbook, or open it explicitly if missing.

• list_calc_documents: list Calc workbooks reachable through UNO.

• list_sheets: list workbook sheets.

• add_sheet: add a sheet if it does not already exist.

• remove_sheet: remove a sheet, while refusing to delete the last sheet.

• activate_sheet: activate a sheet and select a cell for live visual workflows.

• read_cell: read a cell value and formula.

• write_cell: write one cell directly.

• write_range: write a 2D table from a starting cell.

• set_hyperlink: add a Ctrl-click hyperlink to a Calc cell.

• set_internal_hyperlink: add a Ctrl-click hyperlink to another sheet/cell.

• link_url_range: convert plain-text URLs in a range into Ctrl-click hyperlinks.

• apply_calc_template: apply a visual template, including pc_nostalgia.

• create_gpu_purchase_dashboard_live: build the GPU purchase dashboard through UNO for live demos, including native Calc charts.

• auto_fit_sheets: adjust column widths, row heights, and wrapping.

• save_document: save the workbook.

Build the live GPU purchase dashboard, including charts:

create_gpu_purchase_dashboard_live(
  path="/path/to/workbook.xlsx",
  dashboard_sheet="Dashboard_live",
  recreate=true,
  pause_seconds=0.25
)

Manual Start

cd /home/maxime/.local/share/mcp-libreoffice-calc
uv run python src/main.py

The server starts or joins a LibreOffice UNO listener on 127.0.0.1:2002.

Code Configuration

Example ~/.code/config.toml entry:

[mcp_servers.libreoffice_calc]
command = "uv"
args = ["run", "python", "/home/maxime/.local/share/mcp-libreoffice-calc/src/main.py"]
cwd = "/home/maxime/.local/share/mcp-libreoffice-calc"

[mcp_servers.libreoffice_calc.env]
PYTHONPATH = "/home/maxime/.local/share/mcp-libreoffice-calc/src:/usr/lib/python3.14/site-packages"

Notes

LibreOffice must be reachable through UNO to control an already-open workbook. The recommended flow is to call ensure_calc_document once, then use add_sheet, write_cell, write_range, set_hyperlink, or link_url_range.

MCP servers load tool definitions at process startup. Restart or reload your MCP client after changing server code or configuration.

Files copied from the original base project remain covered by their original license. The main server in src/ has been rewritten for this focused Calc workflow.