# invowerk

Validates ZUGFeRD, Factur-X, XRechnung and Peppol BIS e-invoices. Use it from Claude Code and other MCP clients over HTTP.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI
- Author: invowerk-dev
- License: MIT · policy=link-only · description only; the file stays with the author
- Source: https://github.com/invowerk-dev/invowerk
- Updated: 2026-10-15
- HTML: https://affpapa.org/en/nevibecode/mcp/invowerk

## What it does

invowerk validates ZUGFeRD and Factur-X PDFs, XRechnung in UBL or CII form, and Peppol BIS Billing. XRechnung checks use the KoSIT validator, while PDF files also go through PDF/A validation. Results include the verdict, applied rule sets and the document SHA-256.

The server is available through `https://api.invowerk.dev/mcp/`, a REST API and a browser tool. Files are handled in memory rather than stored. The anonymous tier works without an API key but has a lower rate limit; adding `X-API-Key` raises plan limits, with 500 free credits per month for the API and MCP service.

It supports Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Cline, Zed and Windsurf (Devin Desktop). A failed validation still returns a response with `valid: false` and individual findings.

## Requirements
- Remote server: `https://api.invowerk.dev/mcp/`

## Install

### Claude Code (native platform)

**Platform CLI: remote server**
```bash
claude mcp add --transport http xrechnung-e-invoice-validator https://api.invowerk.dev/mcp/
```

### Codex

**Platform CLI: remote server**
```bash
codex mcp add invowerk --url https://api.invowerk.dev/mcp/
```

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "invowerk": {
            "url": "https://api.invowerk.dev/mcp/"
        }
    }
}
```

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "invowerk": {
            "type": "http",
            "url": "https://api.invowerk.dev/mcp/"
        }
    }
}
```

### Gemini CLI

**Platform CLI: remote server**
```bash
gemini mcp add -t http invowerk https://api.invowerk.dev/mcp/
```

## When to use it
- validate a ZUGFeRD or Factur-X PDF
- check an XRechnung UBL or CII file
- inspect a Peppol BIS Billing invoice
- return the document hash and rule results
- identify findings in an e-invoice

## Example prompts
- Validate `beispiel-xrechnung.xml` and list any business-rule findings.
- Check this ZUGFeRD PDF for PDF/A compliance and return its SHA-256.
- Detect the invoice format and explain every validation problem.

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