Factur-X: Generate & Validate E-Invoices

Try fixed invoice samples (no document input)

view_invoice_demo

Read-onlyIdempotent

Demonstrate the engine on bundled synthetic samples only; never checks a user's invoice.

Use for product evaluation without a key. To check a supplied document, choose validate_invoice.
Choose sample=valid to inspect a passing CII invoice or sample=invalid to see the missing-buyer-name
finding. Both use the production XSD and EN 16931 engine; results may be cached for 24 hours for
the same engine version and input. Inspect validated_at and cached; a cache hit is not a fresh run.
Call with {} to validate the passing sample, or sample=downloads for PDF/CII/UBL files and the published report.
Accepts no document data, URLs or extra arguments. No PDF or business-register checks in live mode.
Shared rate limits return a retryable tool error; unavailable checks never become a passing result.
Use explain_finding for a returned rule id. Your own invoices require validate_invoice with
a verified-account trial, prepaid or monthly-plan key. Nothing is stored except reports for these public fixtures.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`sample`	No	valid (default): passing CII invoice; invalid: missing buyer name; downloads: published files.	valid

Output Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedOct 2, 2026

removedInput schema / properties / sample / anyOf

Removed value: -[
-  {
-    "enum": [
-      "valid",
-      "invalid"
-    ],
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

changedInput schema / properties / sample / default
```
Previous value: -nullNew value: +"valid"
```

changedInput schema / properties / sample / description

Previous value: -"valid: fixed CII invoice; invalid: same invoice without the buyer name. Omit for downloads."New value: +"valid (default): passing CII invoice; invalid: missing buyer name; downloads: published files."

addedInput schema / properties / sample / enum

Added value: +[
+  "valid",
+  "invalid",
+  "downloads"
+]

addedInput schema / properties / sample / type
```
Added value: +"string"
```

Changed1 schema field changedSep 30, 2026

addedInput schema / properties / sample

Added value: +{
+  "anyOf": [
+    {
+      "enum": [
+        "valid",
+        "invalid"
+      ],
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "valid: fixed CII invoice; invalid: same invoice without the buyer name. Omit for downloads.",
+  "title": "Sample"
+}

AddedSep 27, 2026

TDQS

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