ZUGFeRD Validator is answering right now. Last checked 15 min ago. 84 installs a week from npm. It exposes 5 tools.
Validiert E-Rechnungen (ZUGFeRD/Factur-X, XRechnung) gegen EN 16931 mit Korrekturvorschlägen.
The linked repository no longer exists on GitHub — it was deleted or made private.
What changed 3
Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 13 August 2026. No other catalogue keeps this.
ZUGFeRD Validator missed one check this week
Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of from your users.
Connect this server
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 15 min ago.
claude mcp add validator --transport http https://api.zugferd-validator.de/mcp{
"mcpServers": {
"validator": {
"url": "https://api.zugferd-validator.de/mcp"
}
}
}[mcp_servers.validator]
url = "https://api.zugferd-validator.de/mcp"{
"mcpServers": {
"validator": {
"url": "https://api.zugferd-validator.de/mcp"
}
}
}{
"mcpServers": {
"validator": {
"url": "https://api.zugferd-validator.de/mcp"
}
}
}This one needs environment variables set before it will start:
ZUGFERD_API_KEY (API-Key von https://zugferd-validator.de/konto (Demo-Key: zv_demo_public_zugferd_2026)).
The author declared them in the registry entry; get the values from the project itself.
Available tools 5
Read directly from the server with tools/list, grouped by what they act on.
If a tool disappears, we record the date.
check_consistency
extract_xml
create_invoice
validate_invoice
validation_report
Endpoints
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://api.zugferd-validator.de/mcp | streamable-http | answering | 146 ms | 15 min ago |
Alternatives to ZUGFeRD Validator
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ZUGFeRD Validator — questions
Answers built from our own checks of this server.