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REGON (Polish business register)

io.github.SmartMobileHouse/regon-mcp · v0.2.3

Look up Polish businesses in the GUS REGON register (BIR1) by NIP, REGON, or KRS.

Source code Set it up

Connect Runs on your machine

Terminal
claude mcp add regon-mcp -e REGON_API_KEY=<REGON_API_KEY> -e REGON_ENV=<REGON_ENV> -- uvx regon-mcp==0.2.3
claude_desktop_config.json
{
  "mcpServers": {
    "regon-mcp": {
      "command": "uvx",
      "args": [
        "regon-mcp==0.2.3"
      ],
      "env": {
        "REGON_API_KEY": "<REGON_API_KEY>",
        "REGON_ENV": "<REGON_ENV>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "regon-mcp": {
      "command": "uvx",
      "args": [
        "regon-mcp==0.2.3"
      ],
      "env": {
        "REGON_API_KEY": "<REGON_API_KEY>",
        "REGON_ENV": "<REGON_ENV>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "regon-mcp": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "regon-mcp==0.2.3"
      ],
      "env": {
        "REGON_API_KEY": "<REGON_API_KEY>",
        "REGON_ENV": "<REGON_ENV>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

NameDescription
REGON_API_KEY
Optional, secret		GUS BIR USER_KEY for live production data. Omit to use the public test key against the anonymized test database.
REGON_ENV
Optional		Which GUS environment to query: 'test' (default) or 'prod'. Use 'prod' with a real USER_KEY.

Details

Package[email protected] (PYPI, stdio)
First published4 Nov 2026
Last updated4 Nov 2026
Registry nameio.github.SmartMobileHouse/regon-mcp

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