GroupDocs.Signature MCP Server

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

Installation

Requires .NET 10 SDK.

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

dnx GroupDocs.Signature.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 GroupDocs.Signature.Mcp@26.5.0 --yes

Or install as a global dotnet tool:

dotnet tool install -g GroupDocs.Signature.Mcp
groupdocs-signature-mcp

Or run via Docker:

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

Native prerequisites

The underlying GroupDocs engine renders signature glyphs (text, QR codes, barcodes) onto document pages via System.Drawing (GDI+). When you run the server natively (via dnx or the global dotnet tool) on Linux or macOS, install the native libgdiplus library and a fonts package first:

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

Example prompts

• "Sign contract.pdf with a QR code containing 'Signed by Alice'"
• "Verify all signatures in agreement.docx and tell me if any failed"
• "Search invoice.pdf for QR codes — return the decoded text and the QR images"
• "Are there any digital signatures in this report.pdf? If so, who signed it?"
• "Add a text signature 'APPROVED' to the bottom-right of every page of policy.pdf"

Configuration

Usage with Claude Desktop

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

To pin to a specific version, replace "GroupDocs.Signature.Mcp" with "GroupDocs.Signature.Mcp@26.5.0" 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-signature": {
      "type": "stdio",
      "command": "dnx",
      "args": ["GroupDocs.Signature.Mcp", "--yes"],
      "env": {
        "GROUPDOCS_MCP_STORAGE_PATH": "${input:storage_path}"
      }
    }
  }
}

Same pinning rule as above — swap "GroupDocs.Signature.Mcp" for "GroupDocs.Signature.Mcp@26.5.0" 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.

License

MIT — see LICENSE