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mcp/harbor
Grok

InvoiceXML for Grok

com.invoicexml/invoicexml

Create, validate, convert & extract compliant e-invoices (UBL, Factur-X, ZUGFeRD, XRechnung)

client:Grok transport:streamable-http

Install InvoiceXML in Grok

.mcp.json (in your project root) 

{
  "mcpServers": {
    "invoicexml": {
      "type": "http",
      "url": "https://mcp.invoicexml.com"
    }
  }
}

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

InvoiceXML in other clients

InvoiceXML MCP server