Validate XML and e-invoices (XSD, DTD, RelaxNG, EN 16931, Peppol, XRechnung), explain errors
Connect Remote server
claude mcp add --transport http xmlvalid https://xmlvalid.com/mcp --header "Authorization: Bearer <YOUR_API_KEY>"
{
"mcpServers": {
"xmlvalid": {
"url": "https://xmlvalid.com/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
}
{
"servers": {
"xmlvalid": {
"type": "http",
"url": "https://xmlvalid.com/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
}
Settings > Connectors > Add custom connector
URL: https://xmlvalid.com/mcp
Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools 5 found in our last check
validate_xmlValidate an XML document with xmlvalid: well-formedness, an XSD, DTD or RelaxNG schema, and for e-invoices the Schematron business rules of EN 16931, Peppol BIS, XRechnung, Factur-X and national formats. Pass the document as `xml` (its text) or `url` (a public http(s) address),…
get_validationThe status and result of a validation started with validate_xml that was still running when it returned (status "queued" or "running"). Results are kept for 24 hours.
search_schemasSearch xmlvalid's catalog of official XML schemas (UBL, CII, Peppol, XRechnung, Factur-X, ISO 20022, HL7, sitemaps…) by name, namespace, root element or area. Returns each schema's slug to pass to validate_xml, its version and the business rules it checks. No sign-in or API key…
explain_errorExplain an XML parsing or schema validation error message: what it means, why it happens and how to fix it, with an example. Understands libxml2 (xmllint, PHP, Python lxml, xmlvalid), Java (Xerces cvc-* codes, SAXParseException) and .NET (System.Xml) wording; paste the message a…
explain_ruleExplain an e-invoicing business rule by its id, such as BR-CO-15, BR-DE-1, PEPPOL-EN16931-R001 or a national CIUS rule: its message, level, the rule sets it belongs to, why invoices fail it and how to fix them. No sign-in or API key needed.
Headers
| Name | Description |
|---|---|
AuthorizationOptional, secret | An xmlvalid API key (Dashboard → API keys, free tier), for validate_xml and get_validation; the lookup tools need none |
Details
| Endpoint | https://xmlvalid.com/mcp (Streamable HTTP) |
| First published | 22 Oct 2026 |
| Last updated | 22 Oct 2026 |
| Registry name | com.xmlvalid/xmlvalid |
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