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mcp/harbor
Grok

REGON (Polish business register) for Grok

io.github.smartmobilehouse/regon-mcp

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

client:Grok transport:stdio runtime:pypi

Install REGON (Polish business register) in Grok

.mcp.json (in your project root)

Held in this page only — never stored, logged, or sent anywhere but back to your screen. 

{
  "mcpServers": {
    "regon-mcp": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "regon-mcp"
      ],
      "env": {
        "REGON_API_KEY": "<REGON_API_KEY>",
        "REGON_ENV": "<REGON_ENV>"
      }
    }
  }
}

Grok Build reads Claude Code's .mcp.json and Claude Desktop's config unchanged, so a server you have already set up there needs nothing new. The Grok web app and X integration do not take custom servers. Grok docs

REGON (Polish business register) in other clients

REGON (Polish business register) MCP server