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xmlvalid MCP server

Which MCP servers are xmlvalid's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-22

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Whose server it is
  • Registry namecom.xmlvalid/xmlvalidverified in the MCP registry

The registry name sits under xmlvalid.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-22
  • Stateanswerschecked 2026-10-22
  • Tools5
  • Server calls itselfxmlvalid
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-22 the server answered initialize and tools/list without a sign-in. First answer in 764 ms.

Should an agent connect itNot proven either way yet
  • Its tools do Validate XML files against XSD, DTD or RelaxNG schemas; Check e-invoices against EN 16931, Peppol and national rules, but not Pretty-print, minify or convert XML to JSON and CSV.
  • Checked on 5 of the 7 days it takes to judge reliability.

Once connected

  • For "Validate XML files against XSD, DTD or RelaxNG schemas", the likely first call is validate_xml.
  • For "Check e-invoices against EN 16931, Peppol and national rules", the likely first call is validate_xml.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 5, the first on 2026-10-22
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 5 so far
  • What an agent can do with it2 of 3 use cases
  • Answeredmeasuring5 of the 7 daily checks it takes to print a share
  • Median first answer819 ms
  • Space in an agent's context≈ 887 tokensthe definitions of all its tools (5), which an agent carries on every turn
  • Tool definitionsA · 97 of 100
  • Typed results0 of 5 toolsdeclared outputSchema: results come typed, read once
  • Not saying whether it only reads or can destroy: 1 of 5

What an agent can do with it

  • can do · Validate XML files against XSD, DTD or RelaxNG schemas
  • can do · Check e-invoices against EN 16931, Peppol and national rules
  • cannot · Pretty-print, minify or convert XML to JSON and CSV

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers5 tools · read 2026-10-22
  • validate_xml

    Validate 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…

  • get_validation

    The 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_schemas

    Search 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…

  • explain_error

    Explain 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…

  • explain_rule

    Explain 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 API key needed.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

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

Add it

Claude Code, in a terminal

claude mcp add --transport http xmlvalid https://xmlvalid.com/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://xmlvalid.com/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.