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validator

MCP serverDev tools

This integration checks electronic invoices in ZUGFeRD/Factur-X and XRechnung formats against the EN 16931 standard. Once added, your AI can review invoices for compliance issues and receive concrete correction suggestions, so faulty invoices are caught before they cause problems.

Use validator in Claude, ChatGPT or Ahel Desktop

Free. Sign in, add validator and connect your AI. About a minute.

ClaudeChatGPTAhel Desktop

Also: Claude Code · Cursor · Codex

Then ask your AI: use validator to validate invoice

Details

Available today. Use it from your connected AI after setup.

After adding it, give your AI an e-invoice and ask it to check the file. It will report any EN 16931 issues together with suggested corrections.

validatorStart free

What your AI can do with it

  • Validate ZUGFeRD/Factur-X invoices against EN 16931
  • Validate XRechnung invoices against EN 16931
  • Report which rules an invoice fails
  • Suggest fixes for invoices that do not pass the check

Install validator

The server’s own address, for the clients that take one directly. Or connect Ahel once and every client you use reads it from one address, with the account kept on Ahel rather than in each client’s config.

  • Claude Code

    claude mcp add --transport http --scope user validator 'https://api.zugferd-validator.de/mcp'

    Run it once in your project, then open /mcp to approve any sign-in the server asks for.

  • Claude Desktop

    https://api.zugferd-validator.de/mcp

    Add a custom connector in Settings, paste this address, and approve the sign-in.

  • Cursor

    cursor://anysphere.cursor-deeplink/mcp/install?name=validator&config=eyJ1cmwiOiJodHRwczovL2FwaS56dWdmZXJkLXZhbGlkYXRvci5kZS9tY3AifQ==

    Open the link and Cursor adds the server at that address.

  • ChatGPT

    https://api.zugferd-validator.de/mcp

    In Settings, enable Developer mode, create an MCP app, and paste this address. Your plan and workspace must allow custom apps.

  • Codex

    codex mcp add validator --url 'https://api.zugferd-validator.de/mcp'

    Run it once, then sign in with codex mcp login validator if the server asks for an account.

Tools it offers (5)

What this server listed when Ahel dialed its public endpoint in Oct 2026, with no key and no account of yours. The names are the server’s own.

  • validate_invoice
  • extract_xml
  • check_consistency
  • create_invoice
  • validation_report

Signals

Weekly downloads
74
Advanced
Delivery
validator MCP server → your Ahel connector (mcp.ahel.ai) → your AI.
Item type
mcp-server
Key
de-zugferd-validator-validator
Source
github.com/tzatti1/zugferd-validator
Hosted endpoint
https://api.zugferd-validator.de/mcp

github.com/tzatti1/zugferd-validator

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