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LibreOffice MCP Tools

by passerbyflutter
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LibreOffice MCP Tools

npm version

A Model Context Protocol (MCP) server that gives AI agents (Claude, Copilot, Gemini, Cursor, etc.) the ability to read, write, and edit Office documents via LibreOffice — with a token-efficient design that minimizes LLM context usage.

Inspired by the architecture of chrome-devtools-mcp.

✨ Features

  • 22 MCP tools covering reading, writing, spreadsheets, and presentations

  • Token-efficient design: outline-first navigation, range-based access, pagination

  • Broad format support: DOCX, DOC, XLSX, XLS, PPTX, PPT, ODT, ODS, ODP, RTF, CSV, TXT, PDF

  • Legacy format bridge: .doc, .xls, .ppt auto-converted via LibreOffice before parsing

  • No LibreOffice required for basic reads: native parsers handle DOCX, XLSX, PPTX directly

  • LibreOffice required for: legacy formats, PDF export, format conversion

📋 Supported Formats

Format

Extensions

Read

Write

Method

Word 2007+

.docx, .dotx

✅

✅

Native (mammoth read / JSZip OOXML write)

Word 97-2003

.doc, .dot

✅

✅

LibreOffice bridge

Excel 2007+

.xlsx, .xlsm

✅

✅

Native (ExcelJS)

Excel 97-2003

.xls

✅

✅

LibreOffice bridge

PowerPoint 2007+

.pptx

✅

✅

Native (JSZip OOXML)

PowerPoint 97-2003

.ppt

✅

✅

LibreOffice bridge

OpenDocument Text

.odt

✅

✅

LibreOffice bridge

OpenDocument Spreadsheet

.ods

✅

✅

LibreOffice bridge

OpenDocument Presentation

.odp

✅

✅

LibreOffice bridge

Rich Text Format

.rtf

✅

✅

LibreOffice bridge

CSV

.csv

✅

✅

Native

PDF

.pdf

✅ (text)

❌

LibreOffice CLI

Plain text

.txt

✅

✅

Native

🚀 Quick Start

Prerequisites

  • Node.js 20+

  • LibreOffice (optional for basic DOCX/XLSX/PPTX reads; required for .doc/.xls/.ppt and format conversion)

    • Windows: Download LibreOffice

    • macOS: brew install --cask libreoffice

    • Linux: sudo apt install libreoffice or sudo dnf install libreoffice

Installation

Using npx (recommended — no install needed):

{
  "mcpServers": {
    "libreoffice": {
      "command": "npx",
      "args": ["-y", "@passerbyflutter/libreoffice-mcp-tools"]
    }
  }
}

Global install:

npm install -g @passerbyflutter/libreoffice-mcp-tools

From source:

git clone https://github.com/passerbyflutter/libreoffice-mcp-tools
cd libreoffice-mcp-tools
npm install
npm run build

Configure your MCP client

Add to your MCP client configuration (e.g., Claude Desktop claude_desktop_config.json):

{
  "mcpServers": {
    "libreoffice": {
      "command": "npx",
      "args": ["-y", "@passerbyflutter/libreoffice-mcp-tools"],
      "env": {
        "SOFFICE_PATH": "/path/to/soffice"
      }
    }
  }
}

Or use .mcp.json at your project root:

{
  "mcpServers": {
    "libreoffice": {
      "command": "npx",
      "args": ["-y", "@passerbyflutter/libreoffice-mcp-tools"]
    }
  }
}

CLI Options

node build/bin/libreoffice-mcp.js [options]

  --libreoffice-path <path>   Path to soffice executable
                              (default: auto-detected or SOFFICE_PATH env)

🛠 Tool Reference

Document Management

Tool

Description

document_open

Open a file → returns docId handle. Auto-bridges legacy formats.

document_close

Release document handle and temp files

document_list

List all open documents

document_create

Create new empty document (writer/calc/impress)

document_save

Save to current or new path

document_export

Export via LibreOffice (PDF, HTML, CSV, etc.)

document_convert

Convert file format (DOC→DOCX, XLSX→CSV, etc.)

Reading (Token-Efficient)

Tool

Description

document_get_metadata

Title, author, word/page count, dates

document_get_outline

Headings (Writer) / sheet names (Calc) / slide titles (Impress)

document_read_text

Paginated document text as Markdown

document_read_range

Specific paragraph or slide range

document_search

Find text with surrounding context

Writing (Writer)

Tool

Description

document_insert_text

Insert at start/end/after heading

document_replace_text

Find & replace (first or all occurrences)

document_insert_paragraph

Insert paragraph at specific index

document_apply_style

Apply heading/paragraph style

Spreadsheet (Calc)

Tool

Description

spreadsheet_list_sheets

Sheet names with row/col counts

spreadsheet_get_range

Cell range as JSON + markdown table

spreadsheet_set_cell

Set cell value or formula

spreadsheet_set_range

Set 2D range of values

spreadsheet_add_sheet

Add new sheet

spreadsheet_get_formulas

Get formula expressions in range

Presentation (Impress)

Tool

Description

presentation_list_slides

Slide titles with index

presentation_get_slide

Full slide content (title, body, notes)

presentation_get_notes

Speaker notes

presentation_add_slide

Add new slide (requires LibreOffice)

presentation_update_slide

Update slide content

💡 Token-Saving Workflow

For maximum token efficiency, follow this pattern:

1. document_open(filePath) → get docId
2. document_get_metadata(docId) → understand size/type
3. document_get_outline(docId) → see structure
4. document_read_range(docId, startIndex=N, endIndex=M) → read specific section

Instead of dumping the entire document, you navigate to exactly what you need.

Spreadsheet workflow:

1. document_open(path) → docId
2. spreadsheet_list_sheets(docId) → see all sheets
3. spreadsheet_get_range(docId, sheetName="Sales", range="A1:D20") → targeted data

🏗 Architecture

src/
├── index.ts                # createMcpServer() — MCP server factory
├── LibreOfficeAdapter.ts   # soffice subprocess manager
├── DocumentContext.ts      # Open document registry
├── DocumentSession.ts      # Per-document state + format bridge
├── McpResponse.ts          # Response builder (text/JSON/markdown)
├── Mutex.ts                # Serializes LibreOffice subprocess calls
├── parsers/
│   ├── DocxParser.ts           # DOCX read → {paragraphs, outline, metadata} (mammoth)
│   ├── DocxOoxmlEditor.ts      # DOCX write → direct JSZip OOXML manipulation (format-preserving)
│   ├── XlsxParser.ts           # XLSX read/write via ExcelJS
│   ├── PptxParser.ts           # PPTX read → {slides[]} (JSZip XML)
│   └── PptxOoxmlEditor.ts      # PPTX write → add/update slides, create PPTX (JSZip OOXML)
├── formatters/
│   ├── MarkdownFormatter.ts
│   ├── JsonFormatter.ts
│   └── TableFormatter.ts   # Spreadsheet → Markdown table
└── tools/
    ├── documents.ts         # open/close/list/create
    ├── reader.ts            # metadata/outline/read/search
    ├── writer.ts            # insert/replace/style
    ├── spreadsheet.ts       # get/set cells/ranges/sheets
    ├── presentation.ts      # slides/notes
    └── converter.ts         # save/export/convert

🧪 Testing

# Create sample fixtures
node tests/create-fixtures.mjs

# Run smoke tests
npm test

📝 Environment Variables

Variable

Description

SOFFICE_PATH

Path to LibreOffice soffice executable

DEBUG

Set to lo-mcp:* for verbose logging

📄 License

MIT

Install Server
A
security – no known vulnerabilities
A
license - permissive license
A
quality - A tier

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