GroupDocs Comparison

MCP server that exposes GroupDocs.Comparison as AI-callable tools for Claude, Cursor, GitHub Copilot, and other MCP agents.

NuGet NuGet downloads Docker pulls MCP Registry Integration tests License: MIT

Installation

Install in VS Code Install in VS Code Insiders Add to Cursor Codex CLI setup Windsurf setup

One-click installs pre-fill every supported setting: edit the placeholder documents folder after install (output defaults to the same folder); an empty GROUPDOCS_LICENSE_PATH runs in evaluation mode - point it at your license to lift limits.

More clients - ready-made configs for Claude Code, Codex CLI, Visual Studio 2022, Cursor, Windsurf, Cline, and JetBrains Rider live in install/generated/.

Requires .NET 10 SDK.

Run directly with dnx (recommended — no install step):

dnx GroupDocs.Comparison.Mcp --yes

Pulls the latest stable release on every invocation. To pin to a specific version (recommended for shared configs and CI), append @<version>:

dnx [email protected] --yes

Or install as a global dotnet tool:

dotnet tool install -g GroupDocs.Comparison.Mcp
groupdocs-comparison-mcp

Or run via Docker:

docker run --rm -i \
  -v $(pwd)/documents:/data \
  ghcr.io/groupdocs-comparison/comparison-net-mcp:latest

Native prerequisites

The underlying GroupDocs engine uses System.Drawing (GDI+) for some operations. When you run the server natively (via dnx or the global dotnet tool) on Linux or macOS, install the native libgdiplus library first:

Platform	Setup
Windows	Nothing — GDI+ is built into the OS.
Linux	sudo apt-get install -y libgdiplus libfontconfig1 ttf-mscorefonts-installer
macOS	brew install mono-libgdiplus
Docker	Nothing — the image already bundles libgdiplus.

Skipping this on Linux/macOS surfaces as DllNotFoundException: libgdiplus in the tool response. The simplest zero-setup option on Linux/macOS is the Docker image.

Available MCP Tools

Tool	Description
Compare	Compares two documents (source vs target) and produces a marked-up result file, plus a change-count summary and a structured JSON list of the changes (type, page, the changed fragment, surrounding source/target text, table cell, style changes). Use when the user wants the rendered diff document. Supports PDF, Word, Excel, PowerPoint, ODT, RTF, TXT, HTML, and 30+ more formats; optional sourcePassword / targetPassword cover protected documents.
AnalyzeChanges	Returns the differences between two documents as structured data only — the same JSON change list as Compare, but without rendering or saving a result file. Cheaper than Compare; use when the user wants to summarize, explain, or reason about what changed rather than obtain the marked-up file. Optional sourcePassword / targetPassword.
GetDocumentInfo	Inspects a single source document and returns file type, page count, file size, and per-page dimensions as JSON — without performing a comparison. Useful as a pre-flight check before deciding whether to compare or which formats to expect. Optional password for protected documents.

Example prompts for AI agents

Once the server is wired up to your MCP client (Claude Desktop, Cursor, VS Code Copilot, …), try:

Compare old.pdf and new.pdf and save the marked-up result.

Diff contract-v1.docx against contract-v2.docx and tell me the change count.

What changed between proposal-v1.docx and proposal-v2.docx? Summarize the edits.

Did the prices change between budget-q1.xlsx and budget-q2.xlsx? Which cells?

How many pages does report.pdf have? Who's the author?

Inspect /docs/legal-brief.pdf — what's the file type and page count?

The client picks Compare when the user wants the rendered diff file, AnalyzeChanges when they only want to know what changed (summary / analysis, no file), and GetDocumentInfo for inspection-only questions.

Licensing

The MCP server itself is MIT; the underlying GroupDocs.Comparison engine requires a license for production use. Without one the server runs in evaluation mode:

• Comparison output may carry evaluation watermarks / notices.
• A single server process can open at most 15 documents; further calls fail with an evaluation-cap error until the server restarts.

To lift the limits, point GROUPDOCS_LICENSE_PATH at your GroupDocs.Total.lic:

• Get a free 30-day temporary license
• Purchase a license | Product page

Configuration

Variable	Description	Default
GROUPDOCS_MCP_STORAGE_PATH	Base folder for input and output files	current directory
GROUPDOCS_MCP_OUTPUT_PATH	(Optional) separate folder for output files	GROUPDOCS_MCP_STORAGE_PATH
GROUPDOCS_LICENSE_PATH	Path to GroupDocs license file	(evaluation mode)

Usage with Claude Desktop

{
  "mcpServers": {
    "groupdocs-comparison": {
      "type": "stdio",
      "command": "dnx",
      "args": ["GroupDocs.Comparison.Mcp", "--yes"],
      "env": {
        "GROUPDOCS_MCP_STORAGE_PATH": "/path/to/documents"
      }
    }
  }
}

To pin to a specific version, replace "GroupDocs.Comparison.Mcp" with "[email protected]" in args. Pinning is recommended for shared / committed configs to avoid surprise upgrades.

Usage with VS Code / GitHub Copilot

NuGet.org generates a ready-to-use mcp.json snippet on the package page. Copy it directly into your .vscode/mcp.json.

Alternatively, add manually to .vscode/mcp.json:

{
  "inputs": [
    {
      "type": "promptString",
      "id": "storage_path",
      "description": "Base folder for input and output files.",
      "password": false
    }
  ],
  "servers": {
    "groupdocs-comparison": {
      "type": "stdio",
      "command": "dnx",
      "args": ["GroupDocs.Comparison.Mcp", "--yes"],
      "env": {
        "GROUPDOCS_MCP_STORAGE_PATH": "${input:storage_path}"
      }
    }
  }
}

Same pinning rule as above — swap "GroupDocs.Comparison.Mcp" for "[email protected]" to lock to a specific release.

Usage with Docker Compose

cd docker
docker compose up

Edit docker/docker-compose.yml to point volumes at your local documents folder.

Documentation & guides

Step-by-step deployment guides and a published-package integration test suite live in the companion repo GroupDocs.Comparison.Mcp.Tests:

• Install from NuGet — dnx, global tool, pinned vs always-latest
• Run via Docker
• Verify on the MCP registry
• Use with Claude Desktop
• Use with VS Code / GitHub Copilot
• Run the integration tests

That repo also exercises every advertised tool against the published NuGet artifact on Linux, macOS, and Windows in CI — so the snippets above are verified end-to-end on every release.

License

MIT — see LICENSE