OpenRegister MCP Server

A unofficial Model Context Protocol (MCP) server for accessing the OpenRegister API, providing tools to search and retrieve company information from the German company register.

Features

• Search for companies based on various criteria (name, register number, type, etc.)
• Get detailed company information including history, financials, and documents
• Retrieve company shareholders information

Requirements

• Python 3.9+
• uv
• OpenRegister API key (which you can get from https://openregister.de after you have created an account)
• Claude Desktop (or another MCP client that understands MCP)

Installation

1. Clone the repository:

   git clone https://github.com/Syndicats/openregister-mcp.git
   cd openregister-mcp
   

2. Create a virtual environment and install dependencies:

   uv venv
   source .venv/bin/activate
   uv pip install "mcp[cli]" httpx dotenv
   

3. Create a .env file based on the example:

   cp env.example .env
   

4. Add your OpenRegister API key to the .env file:

   OPENREGISTER_API_KEY=your_api_key_here
   OPENREGISTER_API_URL=https://api.openregister.de/v0
   

Usage as MCP Server

Run the server within Claude Desktop, e.g. by editing the claude_desktop_config.json from Claude Desktop

{
    "mcpServers": {
        "openregister": {
            "command": "uv",
            "args": [
                "--directory",
                "<Absolute Path to openregister-mcp>/openregister-mcp",
                "run",
                "server.py"
            ]
        }
    }
}

Restart Claude Desktop so that the changes take effect.

Caution

Sometimes it is necessary to use the absolute path for uv. Then the JSON needs to be changed accordingly.

Available Tools

The server provides the following MCP tools:

1. search_companies - Search for companies based on various criteria

   • Parameters:
     • query: Text search query to find companies by name
     • register_number: Company register number for exact matching
     • register_type: Type of register to filter results (e.g., "HRB", "HRA", "PR", "GnR", "VR")
     • register_court: Court where the company is registered
     • active: Filter for active or inactive companies (default: true)
     • legal_form: Legal form of the company (e.g., "gmbh", "ag", "ug")

2. get_company_info - Get detailed information about a company using its unique ID

   • Parameters:
     • company_id: Unique company identifier (e.g., "DE-HRB-F1103-267645")
     • history: Include historical company data (default: true)
     • financials: Include financial data (default: true)
     • documents: Include document metadata (default: true)

3. get_company_shareholders - Retrieve the shareholders of a company

   • Parameters:
     • company_id: Unique company identifier (e.g., "DE-HRB-F1103-267645")
   • Note: Currently only supports companies with the legal form GmbH

License

MIT