mcp-einvoicing-de

# mcp-einvoicing-de 🇩🇪

[English](README.md) | [Deutsch](README.de.md)

<!-- mcp-name: io.github.cmendezs/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.

---

## 🏗️ Built on

This package is built on [**mcp-einvoicing-core**](https://github.com/cmendezs/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.

---

## 🏗️ 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 / datev_export / tax_rules
    (+ core Peppol tool plugin, mounted separately: lookup / send / DNS / codelists)

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

---

## 🚀 Installation

### Via PyPI (recommended)

```bash
pip install mcp-einvoicing-de
```

Without prior installation, using `uvx`:

```bash
uvx mcp-einvoicing-de
```

### From source

```bash
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 1.09.2 and KoSIT XRechnung 3.0.2). Required for local Schematron validation; lxml supports XSLT 1.0 only. | `pip install mcp-einvoicing-de[xslt2]` |
| `[pdf]` | Additional PDF utilities for embedded XML extraction (`pikepdf` is also a base dependency for PDF/A-3 generation). | `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]` |

---

## ⚙️ 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. Only used if cloud validation is enabled — see `EINVOICING_DE_KOSIT_ENABLE` | |
| `EINVOICING_DE_KOSIT_ENABLE` | Set to `1` to enable KoSIT cloud validation (`validator.kosit.de` or a self-hosted endpoint). Local Schematron-only validation is the default | |
| `EINVOICING_PEPPOL_CODELIST_DIR` | Local directory containing your own copy of the OpenPeppol eDEC Code Lists, required by the Peppol codelist tools (not bundled with this package; see `mcp-einvoicing-core` README) | |

### 🤖 Claude Desktop integration

Add the following entry to `claude_desktop_config.json`:

```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):

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

### 🪐 Kiro integration

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

---

## 🧰 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. `output_format='pdf'` produces a PDF/A-3 level B hybrid invoice with sRGB ICC profile, OutputIntent, embedded fonts, and deterministic /ID. |
| `invoice_validate` | Validate an invoice against EN 16931 and KoSIT rules (BR-DE-\*). Local Schematron validation runs by default (no data leaves your machine); set `cloud_validate=True` or `EINVOICING_DE_KOSIT_ENABLE=1` to opt into KoSIT cloud validation (`validator.kosit.de` or a self-hosted endpoint) with exponential backoff retry (1s/2s/4s). XSLT 2.0 local validation requires the `[xslt2]` extra. |
| `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`. |
| `invoice_convert` | Convert between ZUGFeRD profiles, swap ZUGFeRD/XRechnung CII headers, or perform cross-syntax CII/UBL conversion via core `convert_wire_format`. |
| `datev_export` | Export a ZUGFeRD invoice as a DATEV EXTF 700 Buchungsstapel CSV file for import into DATEV accounting software. Defaults to SKR 03 accounts (8400 revenue / 10000 receivable). |
| `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). |

### Peppol network tools

Peppol participant lookup, service-endpoint lookup, a DNS-only diagnostic, AS4 send, and the OpenPeppol eDEC codelist tools are provided by the shared core Peppol tool plugin (`mcp_einvoicing_core.peppol.tools.register_peppol_tools`), mounted in `server.py` with a German-specific identifier adapter: a bare USt-IdNr (e.g. `123456789` or `DE123456789`) is normalized to the `9930:<value>` Peppol scheme (`DE:VAT`); an already scheme-qualified identifier (e.g. `9930:DE123456789`, or `0204:<leitweg-id>` for Leitweg-ID-routed B2G invoices) passes through unchanged. To send via AS4, first produce XRechnung UBL with `invoice_convert` (or `invoice_create` with `target_syntax='UBL'`), then pass the result to `peppol_send`.

| Tool | Description |
|---|---|
| `peppol_lookup_participant` | Check whether a business is registered on the Peppol network; returns registration status and supported document types |
| `peppol_get_service_endpoint` | Fetch the AS4 endpoint for a participant's document type |
| `resolve_peppol_dns` | DNS-only (SML) diagnostic, independent of SMP reachability |
| `peppol_send` | Transmit a UBL/CII invoice via AS4 |
| `list_participant_id_schemes`, `list_document_type_ids`, `list_process_ids`, `list_spis_use_case_ids` | OpenPeppol eDEC codelist lookups (require `EINVOICING_PEPPOL_CODELIST_DIR`) |
| `check_document_type_id_in_codelist`, `check_process_id_in_codelist`, `check_participant_id_scheme_in_codelist`, `get_peppol_codelist_version` | OpenPeppol eDEC codelist checks and version reporting |

See the [`mcp-einvoicing-core` README](https://github.com/cmendezs/mcp-einvoicing-core#readme) for full parameter documentation on these tools.

---

## 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_lookup_participant(
     identifier="123456789",   # bare USt-IdNr, normalized to 9930:DE123456789
     environment="production"
   )
   → {
       "is_registered": true,
       "participant_id": "9930:DE123456789",
       "supported_document_types": ["urn:cen.eu:en16931:2017#compliant#urn:fdc:peppol.eu:2017:poacc:billing:3.0"],
       "smp_hostname": "b-...iso6523-actorid-upis.edelivery.tech.ec.europa.eu"
     }
```

### 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"
     }
```

---

## 📚 Supported standards

| Standard | Version | Profiles / Syntax |
|----------|---------|-------------------|
| ZUGFeRD | 2.5.2 | MINIMUM, BASIC WL, BASIC, EN 16931, EXTENDED |
| XRechnung | 3.0.2 | CII (C