Add ZUGFeRD Validator MCP client

[tzatti1]

Description

Adds zugferd-mcp-client to the community servers list.

Server details

• npm package: zugferd-mcp-client
• Website: https://zugferd-validator.de
• API docs: https://docs.zugferd-validator.de

What it does

Validates German and European e-invoices against EN 16931:

• validate_invoice — validates ZUGFeRD, Factur-X or XRechnung files (PDF/XML), returns structured JSON with errors, warnings and concrete fix suggestions
• extract_xml — extracts embedded XML from ZUGFeRD/Factur-X PDFs
• check_consistency — checks whether visible PDF data matches embedded XML

Usage

{
  "mcpServers": {
    "zugferd": {
      "command": "zugferd-mcp",
      "env": {
        "ZUGFERD_API_KEY": "zv_..."
      }
    }
  }
}

Free API key available at https://zugferd-validator.de/portal.html (no credit card required).

[olaservo]

Thanks for contributing to the MCP servers repo!

We've retired the third-party server list from the README in favor of the MCP Registry — see #3950 for context. The Official Integrations and Community Servers sections no longer exist in the README, so this PR no longer has a target.

Going forward, please publish your server to the MCP Registry using the quickstart guide:
https://github.com/modelcontextprotocol/registry/blob/main/docs/modelcontextprotocol-io/quickstart.mdx

That's where server discovery now happens. Thanks for building on MCP!

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Note: I'm working through the backlog with help from Claude Code to give everyone a prompt response.