REGON (Polish business register)

Overview

REGON is a Model Context Protocol server that lets you query Polish businesses directly from the GUS REGON register (BIR1). Search by NIP, REGON, or KRS number to retrieve company data. Any MCP-compatible AI assistant can call REGON's tools automatically during conversation or agent workflows, with the model deciding when to invoke lookups.

The server runs locally as a Python package. Install via uvx regon-mcp and provide your API key to authenticate with the BIR1 registry. Version v0.2.2 is available now under the MIT license, with full source code at SmartMobileHouse/regon-mcp on GitHub.

REGON appears in the AI & Agents category on mcp.site and integrates with Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, Zed, and all other MCP clients. If you maintain this project, claim the listing to verify ownership and keep information up to date.

Installation

// claude_desktop_config.json
{
  "mcpServers": {
    "regon_polish_business_register": {
      "command": "uvx",
      "args": [
        "regon-mcp"
      ]
    }
  }
}