NormAPI
Validate and generate German e-invoices (XRechnung, ZUGFeRD) against the official KoSIT rules.
Connect it
Settings → Connectors → Add custom connector
URL: https://normapi.com/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://normapi.com/mcp{
"mcpServers": {
"mcp": {
"url": "https://normapi.com/mcp",
"headers": {
"Authorization": "<YOUR_AUTHORIZATION>"
}
}
}
}claude mcp add --transport http mcp https://normapi.com/mcp --header "Authorization: <value>"{
"servers": {
"mcp": {
"type": "http",
"url": "https://normapi.com/mcp",
"headers": {
"Authorization": "<YOUR_AUTHORIZATION>"
}
}
}
}{
"mcpServers": {
"mcp": {
"command": "npx",
"args": [
"-y",
"@normapi/mcp@1.0.1"
],
"env": {
"NORMAPI_API_KEY": "<value>"
}
}
}
}claude mcp add mcp -- npx -y @normapi/mcp@1.0.13 tools, verified live
validate_invoiceread-onlyCheck an XRechnung (UBL or CII XML) or a ZUGFeRD/Factur-X PDF against the official KoSIT rules. Returns the verdict, the rule set version, and every finding; each business-rule finding comes with a plain-language meaning, cause and fix. Send the XML as text in `xml`, or the PDF base64-encoded in `pdfBase64` â exactly one. Free, no account needed, 5 MB at most.
generate_invoiceProduce an XRechnung (`ubl` or `cii` XML) or a ZUGFeRD hybrid PDF (`zugferd`) from invoice data. Totals are computed server-side in decimal arithmetic, and the document is validated against the official rules before it is returned. Data the rules do not permit is refused with the broken rules and how to fix each. Needs the user's NormAPI account; each document counts against the monthly allowance
explain_ruleread-onlyExplain one EN 16931 / XRechnung / Peppol business rule by its code (e.g. BR-DE-15, BR-CO-10, PEPPOL-EN16931-R010): what it requires, why invoices typically break it, and how to fix it, with a link to the full page. Case does not matter. Schema findings (cvc-*) have no explanation.
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