ZUGFeRD Validator
REMOTE · API.ZUGFERD-VALIDATOR.DE · 2 COMPONENTS · SCANNED AUG 3
Validiert E-Rechnungen (ZUGFeRD/Factur-X, XRechnung) gegen EN 16931 mit Korrekturvorschlägen.
Available components
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score →
Endpoint Security57
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation not fully verified: no authorisation is required to call this server, and 4 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability63
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 710 tokens (~177/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management27
- Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Add this component to your MCP client. Where a client-specific snippet is available, pick your client below and copy it straight into your config; otherwise use the connection detail shown.
remote · api.zugferd-validator.de
claude mcp add --transport http de-zugferd-validator-validator https://api.zugferd-validator.de/mcp
[mcp_servers.de-zugferd-validator-validator] url = "https://api.zugferd-validator.de/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"de-zugferd-validator-validator": {
"type": "remote",
"url": "https://api.zugferd-validator.de/mcp",
"enabled": true
}
}
} openclaw mcp add de-zugferd-validator-validator --url https://api.zugferd-validator.de/mcp --transport streamable-http
mcp_servers:
de-zugferd-validator-validator:
url: "https://api.zugferd-validator.de/mcp" {
"mcpServers": {
"de-zugferd-validator-validator": {
"type": "http",
"url": "https://api.zugferd-validator.de/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 2 Aug 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.
- 31 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 30 Jul 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.
- 29 Jul 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.
- 27 Jul 26 +1
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 26 Jul 26 60
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 3 Aug 2026 · Probed https://api.zugferd-validator.de/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=zugferd-validator.de | CN=YE2,O=Let's Encrypt,C=US | 7 Jun 2026 | 5 Sept 2026 | ECDSA 256 | ECDSA-SHA384 | 6dee3abe1c4a769e774ea1a93b70f6c1c68 |
| SANs: api.zugferd-validator.de, docs.zugferd-validator.de, www.zugferd-validator.de, zugferd-validator.de | ||||||
| CN=YE2,O=Let's Encrypt,C=US (CA) | CN=Root YE,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | ECDSA 384 | ECDSA-SHA384 | 4df3b15dd6c0784c507cd37b58e6f115 |
| CN=Root YE,O=ISRG,C=US (CA) | CN=ISRG Root X2,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | ECDSA-SHA384 | 872165fc34b6e5fba8add5b3705fb53a |
| CN=ISRG Root X2,O=Internet Security Research Group,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | SHA256-RSA | 6c8f1dc727c7117f7baf853ac980f9cd |
DNSSEC insecure
Validation of api.zugferd-validator.de. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| de. | present | 26755 | 8 | Verified |
| zugferd-validator.de. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| x-content-type-options | nosniff |
| x-frame-options | DENY |
| referrer-policy | strict-origin |
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://api.zugferd-validator.de/mcp | Verified | 200 | |
| http (plaintext) | http://api.zugferd-validator.de/mcp | HTTPS enforced | 301 | https://api.zugferd-validator.de/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability.
check_consistency ~54
Prüft ob die sichtbaren PDF-Daten mit den eingebetteten XML-Daten übereinstimmen.
| Name | Type | Req | Description |
|---|---|---|---|
| pdf_content | string | yes | Base64-kodierter Inhalt der ZUGFeRD-PDF-Datei |
No output schema declared.
No examples provided.
create_invoice ~488
Erstellt aus strukturierten Daten eine valide E-Rechnung — entweder als ZUGFeRD-PDF (PDF/A-3 mit eingebettetem XML) oder als reines XRechnung-XML (mit Leitweg-ID für B2G). Unterstützt mehrere Positionen, alle USt-Kategorien, Rabatte/Zuschläge und Zahlungsangaben. Stateless — es wird nichts gespeichert.
| Name | Type | Req | Description |
|---|---|---|---|
| allowances_charges | array | — | Rabatte/Zuschläge auf Dokumentebene |
| buyer | object | yes | Käufer / Rechnungsempfänger |
| buyer_reference | string | — | Leitweg-ID / Käuferreferenz (BT-10, bei XRechnung Pflicht) |
| currency | string | — | Währung (Standard EUR) |
| date | string | yes | Belegdatum (YYYY-MM-DD) |
| document_type | string | — | Dokumenttyp (Standard invoice). credit_note=Gutschrift/Storno, corrected=Korrektur, self_billed=Gutschriftverfahren, prepayment=Anzahlung, partial=Teilrechnung, debit_note=Belastungsanzeige. Mappt au… |
| due_date | string | — | Fälligkeitsdatum (YYYY-MM-DD) |
| format | string | yes | 'zugferd' = PDF/A-3 mit eingebettetem XML, 'xrechnung' = reines XML |
| lines | array | yes | Rechnungspositionen (mindestens eine) |
| note | string | — | Freitext-Hinweis |
| number | string | yes | Belegnummer |
| payment_means | object | — | Zahlungsangaben (IBAN etc.) |
| payment_terms | string | — | Zahlungsbedingungen (Freitext) |
| preceding_invoice | object | — | Bezug auf die Ursprungsrechnung (BT-25/26) — bei Storno, Korrektur oder Gutschrift angeben |
| self_check | boolean | — | Wenn true, wird die erzeugte Rechnung sofort gegen EN 16931 geprüft (langsamer). Standard: false. |
| seller | object | yes | Verkäufer / Rechnungssteller |
| seller_logo | string | — | Logo als Base64 (PNG/JPG) — nur im Pro/Ultra-Tarif |
| type_code | string | — | Roher UNTDID-1001-Code (überschreibt document_type; für seltene Typen wie 875-877 Bauleistung) |
No output schema declared.
No examples provided.
extract_xml ~53
Extrahiert die eingebettete XML-Datei aus einem ZUGFeRD/Factur-X PDF.
| Name | Type | Req | Description |
|---|---|---|---|
| pdf_content | string | yes | Base64-kodierter Inhalt der ZUGFeRD-PDF-Datei |
No output schema declared.
No examples provided.
validate_invoice ~115
Validiert eine E-Rechnung (ZUGFeRD/Factur-X PDF oder XRechnung XML) gegen EN 16931 und gibt strukturierte Ergebnisse mit Korrekturvorschlägen zurück.
| Name | Type | Req | Description |
|---|---|---|---|
| file_content | string | yes | Base64-kodierter Inhalt der PDF- oder XML-Datei |
| file_type | string | yes | 'pdf' für ZUGFeRD/Factur-X, 'xml' für XRechnung |
| profile | string | — | Erwartetes Profil (optional, wird automatisch erkannt) |
No output schema declared.
No examples provided.