mcp-einvoicing-de 🇩🇪

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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]"

Optional extras

Extra	Purpose	Install
[xslt2]	Saxon-HE backend for XSLT 2.0 Schematron stylesheets (FeRD Factur-X 1.08 and KoSIT XRechnung 3.0.2). Required for local Schematron validation; lxml supports XSLT 1.0 only.	pip install mcp-einvoicing-de[xslt2]
[pdf]	PDF/A-3 hybrid invoice generation and embedded XML extraction (uses pikepdf).	pip install mcp-einvoicing-de[pdf]
[pymupdf]	Alternative PDF engine (uses PyMuPDF).	pip install mcp-einvoicing-de[pymupdf]
[dev]	Development tools (pytest, ruff, pre-commit).	pip install mcp-einvoicing-de[dev]

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⚙️ Configuration

The server does not require external credentials. Available environment variables:

Variable	Description	Default
EINVOICING_DE_LOG_LEVEL	Log level (DEBUG, INFO, WARNING, ERROR)	INFO
EINVOICING_DE_KOSIT_VALIDATOR_URL	URL of a self-hosted KoSIT validation tool REST endpoint (optional, enables remote validation when set)

🤖 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). Enforces the §14 Abs. 2 UStG B2B mandate: non-XML output is rejected for DE-prefixed VAT buyers unless transitional_period_opt_in=True is set. PDF/A-3 hybrid via experimental output_format='pdf' ships XMP pdfaid metadata; full ISO 19005-3 level B (OutputIntent + ICC + fonts) is a v0.4.0 follow-up.
invoice_validate	Validate an invoice against EN 16931 and KoSIT Schematron rules (BR-DE-*). XSLT 2.0 FeRD and KoSIT stylesheets execute via Saxon-HE when the [xslt2] extra is installed.
invoice_parse	Extract structured data from ZUGFeRD or XRechnung XML, or from a PDF/A-3 hybrid invoice with embedded factur-x.xml / zugferd-invoice.xml (requires [pdf] extra).
invoice_convert	Convert between ZUGFeRD profiles or swap ZUGFeRD CII and XRechnung CII headers. Cross-syntax CII to UBL transformation is rejected pending v0.4.0.
peppol_check	Check Peppol participant registration of a German company. Lookup only; AS4 outbound transmission is tracked as DE-PEPPOL-1 for v0.5.0.
tax_rules	Query German VAT rules (rates, §13b UStG reverse charge codes, §19 UStG Kleinunternehmer thresholds at JStG 2024 values of €25,000 preceding year / €100,000 current year, 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	2.3.2	MINIMUM, BASIC WL, BASIC, EN 16931, EXTENDED
XRechnung	3.0.2	CII (Cross Industry Invoice), UBL (Universal Business Language)
EN 16931	2017	European core data model for electronic invoicing
Peppol BIS	3.0	Billing 3.0 (EN 16931-compliant)

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

Current version: v0.3.1. Upcoming releases:

Version	Features
v0.4.0	Full ISO 19005-3 level B in generate_pdf_invoice (sRGB OutputIntent + ICC + TTF fonts); cross-syntax CII to UBL transformation in invoice_convert; default-on KoSIT cloud validation with retry and structured fallback; audit gate reconciliation of country-reference [NEED:] markers
v0.5.0	Peppol AS4 outbound transmission (DE-PEPPOL-1); DATEV import format export (DE-DATEV-1)
v1.0.0	Production-ready: full EN 16931 coverage, KoSIT cloud canary corpus, performance benchmarks, 95% line coverage with mutation tests, end-to-end integration test against the cloud validator

For the history of past releases, see RELEASE.md.

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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.