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Signature for AI Agents (MCP)

Document signing and verification for AI agents via MCP server

Ask Claude, Cursor or Copilot to sign a contract with a certificate, a QR code or a text stamp, or to check who signed a file and whether it is still valid. Certificates and documents stay on your machine.
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One-click install: VS CodeCursorAll clients
Version 26.9.0  released
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Sign a contract with an AI agent

More examples >
{
  "mcpServers": {
    "groupdocs-signature": {
      "command": "dnx",
      "args": ["GroupDocs.Signature.Mcp", "--yes"],
      "env": {
        "GROUPDOCS_MCP_STORAGE_PATH": "/path/to/documents"
      }
    }
  }
}
Then ask: Sign contractA.pdf digitally with signing-cert.pfx
dnx GroupDocs.Signature.Mcp --yes

GroupDocs.Signature MCP server at a glance

An MCP server that gives AI agents the GroupDocs.Signature engine as tools they can call

Illustration signature

Sign and verify without leaving the chat

The agent picks the signature type and placement. GroupDocs.Signature applies digital, QR code, barcode or text signatures and verifies existing ones, so a signing or audit task is one prompt.

Local by design

Your AI client starts the server as a local process over stdio. It opens no ports, sends no telemetry, and reads and writes only the folder you configure, so contracts, records and internal documents never leave your machine.

Works with every MCP client

Use it from Claude Desktop, Claude Code, VS Code with GitHub Copilot, Visual Studio 2022, Cursor, Windsurf, Cline, JetBrains Rider and Codex CLI. One-click installs and ready-made configurations are available for each client.

Runs where your agent runs

GroupDocs.Signature MCP server works on Windows, Linux and macOS, natively with .NET 10 or in Docker

VS Code
Docker
NuGet
Windows
Linux
macOS
Azure
Amazon

NuGet package

  • One command with the .NET 10 SDK, no install step
  • Windows, Linux and macOS
NuGet download

Docker image

  • Nothing to install besides Docker
  • linux/amd64 and linux/arm64, native dependencies bundled
Get the image

VS Code and GitHub Copilot

  • One-click install with a pre-filled configuration
  • Set your documents folder after install
Install in VS Code

Cursor

  • One-click install with a pre-filled configuration
  • Runs in evaluation mode until you add a license
Add to Cursor

Supported file formats

GroupDocs.Signature MCP server works with the following file formats.

Microsoft Office formats

  • Word: DOCX, DOC, DOCM, DOT, DOTX, DOTM, RTF
  • Excel: XLSX, XLS, XLSM, XLSB, XLTM, XLT, XLTM, XLTX, XLAM, SXC, SpreadsheetML
  • PowerPoint: PPT, PPTX, PPS, PPSX, PPSM, POT, POTM, POTX, PPTM

Images & Other Formats

  • Portable: PDF
  • Images: JPG, BMP, PNG, TIFF, GIF, DICOM, WEBP
  • Other office formats: ODT, OTT, OTS, ODS, ODP, OTP, ODG

Other formats

  • Web: HTML, MHTML
  • Archives: ZIP, TAR, 7Z
  • Certificates: PFX

What the MCP server can do

Nine tools to sign, verify and inspect signatures in 30+ document formats

Feature icon

Sign documents

The sign tool applies text, QR code, barcode or digital certificate signatures.

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Verify signatures

The verify tool checks text, QR code, barcode and digital signatures and returns a JSON report.

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Certificate details

The search_digital_signatures tool returns signer, issuer, serial number, validity and signing time.

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Read QR codes and barcodes

The search_qr_codes and search_barcodes tools decode values with their page and position.

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Find stamps and image signatures

The search_text_signatures and search_image_signatures tools list text stamps and signature images.

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Audit a folder

Ask which documents are unsigned, or carry signatures that are no longer valid.

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Document info

The get_document_info tool returns type, page count and page sizes for placement.

Feature icon

PDF, Word, Excel, PowerPoint

Works with PDF, DOCX, XLSX, PPTX and 30+ more formats.

Feature icon

Flexible licensing

Start in evaluation mode, then use a license file or metered keys. The get_license_status tool shows which one is active.

What you can ask your agent

Typical GroupDocs.Signature MCP scenarios, each with the prompt that drives it

Sign a document with a certificate

Point the agent at the document and the certificate file. It signs locally, so neither the contract nor the private key leaves your machine. Step by step: guide and blog walkthrough.

Prompt

Sign contract.pdf digitally using signing-cert.pfx

Verify who signed and when

Before you rely on a signed document, check it. The agent verifies the signatures and reports signer, certificate, signing time and validity. Step by step: guide and blog walkthrough.

Prompt

Verify the signatures on contract_signed.pdf.
Who signed it, with which certificate, and when?

Read QR codes and barcodes

Invoices and shipping documents carry references in QR codes and barcodes. The agent decodes them and tells you which page each one is on. Step by step: guide and blog walkthrough.

Prompt

Read the QR codes and barcodes in invoice.pdf
and tell me what they contain

Run on-premise with Docker

For regulated environments, run the server inside your perimeter. Mount the documents folder and the license, and pin the image version for change control. Architecture and security model: on-premise deployment.

docker-compose.yml

services:
  groupdocs-signature:
    image: ghcr.io/groupdocs-signature/signature-net-mcp:26.9.0
    volumes:
      - "/srv/documents:/data"
      - "/srv/licenses:/license:ro"
    environment:
      GROUPDOCS_MCP_STORAGE_PATH: /data
      GROUPDOCS_LICENSE_PATH: /license/GroupDocs.Total.lic
    stdin_open: true

Install in your AI client

Copy the configuration for your client, or use the one-click links at the top of the page

Register the server

Every client starts the server the same way. Set GROUPDOCS_MCP_STORAGE_PATH to the folder with your documents, then restart the client. Leave GROUPDOCS_LICENSE_PATH empty for evaluation mode. Configurations for Visual Studio 2022, Windsurf, Cline, JetBrains Rider and Codex CLI are in the installation guide.
Claude Desktop Claude Code VS Code Cursor Docker
{
  "mcpServers": {
    "groupdocs-signature": {
      "type": "stdio",
      "command": "dnx",
      "args": ["GroupDocs.Signature.Mcp", "--yes"],
      "env": {
        "GROUPDOCS_MCP_STORAGE_PATH": "/path/to/documents",
        "GROUPDOCS_LICENSE_PATH": ""
      }
    }
  }
}

claude mcp add groupdocs-signature \
  -e GROUPDOCS_MCP_STORAGE_PATH=/path/to/documents \
  -- dnx GroupDocs.Signature.Mcp --yes

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

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

docker run --rm -i \
  -v /path/to/documents:/data \
  ghcr.io/groupdocs-signature/signature-net-mcp:latest

Ready to get started?

Download GroupDocs.Signature for free or get a trial license for full access!

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