mcp-einvoicing-de 0.3.1

MCP server for German electronic invoicing (ZUGFeRD 2.x, XRechnung 3.x, EN 16931)

mcp-einvoicing-de 🇩🇪

English | Deutsch

MCP server (Model Context Protocol) in Python for German electronic invoicing in ZUGFeRD 2.x and XRechnung 3.x formats (EN 16931, FeRD, KoSIT). Enables AI agents (Claude, IDEs) to create, validate, parse, and convert e-invoices that are fully compliant with the German B2B e-invoicing mandate (effective from 2025, phased enforcement through 2027 to 2028) and the European standard EN 16931.

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🏗️ Built on

This package is built on mcp-einvoicing-core, a shared base library for European e-invoicing MCP servers. It provides shared models, validation abstractions, XML utilities, and the exception hierarchy.

mcp-einvoicing-core is automatically installed as a transitive dependency, no additional step required.

For developers: pip install -e ".[dev]" installs the base package automatically from PyPI.

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🏗️ Architecture

mcp-einvoicing-de (this package, standalone MCP server)
├── ZUGFeRDInvoice / XRechnungInvoice  ← Pydantic models (all profiles)
├── SchematronValidator                ← EN 16931 + KoSIT BR-DE-* rules
├── KoSITValidator                     ← Remote validation tool (optional)
└── Tools: create / validate / parse / convert / peppol_check / tax_rules

        ↑ extends
mcp-einvoicing-core (shared base, installed as dependency)
├── BaseDocumentGenerator / Validator / Parser
├── BaseInvoice, BaseParty … (Pydantic)
├── xml_utils, exceptions
└── EInvoicingMCPServer

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🚀 Installation

Via PyPI (recommended)

pip install mcp-einvoicing-de

Without prior installation, using uvx:

uvx mcp-einvoicing-de

From source

git clone https://github.com/cmendezs/mcp-einvoicing-de.git
cd mcp-einvoicing-de

python -m venv .venv
source .venv/bin/activate   # Windows: .venv\Scripts\activate

pip install -e ".[dev]"

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⚙️ Configuration

The server does not require any external credentials in v0.1.0. Available environment variables:

Variable	Description	Default
EINVOICING_DE_LOG_LEVEL	Log level (DEBUG, INFO, WARNING, ERROR)	INFO
EINVOICING_DE_KOSIT_VALIDATOR_URL	URL of the KoSIT validation tool (optional, for remote validation)
EINVOICING_DE_PEPPOL_SMP_URL	Peppol SMP lookup URL (optional)
EINVOICING_DE_PDF_ENGINE	PDF generation engine (reportlab or pymupdf)	reportlab

🤖 Claude Desktop integration

Add the following entry to claude_desktop_config.json:

{
  "mcpServers": {
    "einvoicing-de": {
      "command": "uvx",
      "args": ["mcp-einvoicing-de"]
    }
  }
}

⌨️ Cursor integration

Configuration file (~/.cursor/mcp.json or .cursor/mcp.json in the project directory):

{
  "mcpServers": {
    "einvoicing-de": {
      "command": "uvx",
      "args": ["mcp-einvoicing-de"]
    }
  }
}

🪐 Kiro integration

{
  "mcpServers": {
    "einvoicing-de": {
      "command": "uvx",
      "args": ["mcp-einvoicing-de"],
      "disabled": false,
      "autoApprove": []
    }
  }
}

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🧰 Available MCP tools

Tool	Description
invoice_create	Generate ZUGFeRD or XRechnung XML (CII or UBL); PDF/A-3 hybrid planned (v0.2.0)
invoice_validate	Validate an invoice against EN 16931 and KoSIT Schematron rules (BR-DE-*)
invoice_parse	Extract structured data from an existing ZUGFeRD or XRechnung file
invoice_convert	Convert between ZUGFeRD profiles or ZUGFeRD ↔ XRechnung
peppol_check	Check Peppol participant registration of a German company (AS4)
tax_rules	Query German VAT rules (tax categories, §13b UStG reverse charge, exemptions)

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Usage examples

Example 1: Validate an invoice

1. invoice_validate(
     xml_base64="...",   # Base64-encoded ZUGFeRD XML
     strict=True
   )
   → {
       "is_valid": true,
       "profile": "EN_16931",
       "syntax": "CII",
       "error_count": 0,
       "warning_count": 2,
       "errors": [],
       "warnings": [...],
       "validator_used": "local_schematron"
     }

Example 2: Query German tax rules

2. tax_rules(query="reverse_charge", context="Bauleistungen")
   → {
       "results": [
         {
           "paragraph": "§13b Abs. 2 Nr. 5 UStG",
           "description_en": "Construction services (building contractor rule)",
           "vatex_code": "VATEX-EU-AE",
           "invoice_note": "Steuerschuldnerschaft des Leistungsempfängers (§13b UStG)"
         }
       ],
       "legal_disclaimer": "..."
     }

Example 3: Check Peppol registration

3. peppol_check(
     participant_id="0204:991-1234512345-06",
     environment="production"
   )
   → {
       "is_registered": true,
       "participant_id": "0204:991-1234512345-06",
       "document_type_supported": true,
       "access_point_url": "https://ap.example.de/as4",
       "transport_profile": "peppol-transport-as4-v2.0"
     }

Example 4: Parse invoice data

4. invoice_parse(xml_base64="...", include_raw_xml=False)
   → {
       "profile": "XRECHNUNG",
       "syntax": "CII",
       "invoice_number": "RE-2025-001",
       "invoice_date": "2025-01-15",
       "seller_name": "Muster GmbH",
       "buyer_name": "Käufer AG",
       "tax_inclusive_amount": "119.00",
       "currency_code": "EUR"
     }

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📚 Supported standards

Standard	Version	Profiles / Syntax
ZUGFeRD	2.3	MINIMUM, BASIC WL, BASIC, EN 16931, EXTENDED
XRechnung	3.x	CII (Cross Industry Invoice), UBL (Universal Business Language)
EN 16931		European core data model for electronic invoicing
Peppol BIS	3.0	Billing 3.0 (DE PINT)

Note: ZUGFeRD 2.x and XRechnung 3.x share the same CII XML syntax at the EN 16931 profile level. Conversion between both formats is therefore possible without data loss. The EXTENDED profile is specific to ZUGFeRD and has no XRechnung equivalent.

Resource	Link
FeRD ZUGFeRD specification	ferd-net.de
KoSIT XRechnung	xeinkauf.de
KoSIT validation tool	github.com/itplr-kosit/validationtool
EN 16931-1:2017	CEN
Peppol BIS Billing 3.0	docs.peppol.eu

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🧪 Tests

# Install development dependencies
pip install -e ".[dev]"

# Run the full test suite
pytest tests/ -v

# With coverage report
pytest --cov=mcp_einvoicing_de --cov-report=term-missing

# Model tests only
pytest tests/test_models.py -v

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Roadmap

Version	Features
v0.1.0 (current)	Tools: create, validate, parse, convert, peppol_check, tax_rules
v0.2.0	PDF/A-3 embedding (ZUGFeRD hybrid) via reportlab / PyMuPDF
v0.3.0	KoSIT online validator fully integrated
v0.4.0	Peppol AS4 direct submission
v0.5.0	DATEV export format
v1.0.0	Production-ready, full EN 16931 coverage

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Contributing

Contributions are welcome. Please open an issue before submitting a pull request for significant changes.

git clone https://github.com/cmendezs/mcp-einvoicing-de.git
cd mcp-einvoicing-de
pip install -e ".[dev]"
pytest
make audit

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Other e-invoicing MCP servers

Country	Server
🌍 Global	mcp-einvoicing-core
🇧🇪 Belgium	mcp-einvoicing-be
🇧🇷 Brazil	mcp-nfe-br
🇫🇷 France	mcp-facture-electronique-fr
🇩🇪 Germany	mcp-einvoicing-de
🇮🇹 Italy	mcp-fattura-elettronica-it
🇵🇱 Poland	mcp-ksef-pl
🇪🇸 Spain	mcp-facturacion-electronica-es

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📄 License

This project is licensed under the Apache 2.0 License.
See the LICENSE file for details.

Copyright 2026 cmendezs

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Project maintained by cmendezs. For questions about the ZUGFeRD or XRechnung specification implementation, please open an issue.