MCP server

invowerk Official

dev.invowerk/xrechnung-e-invoice-validator

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

E-invoice checker for ZUGFeRD, Factur-X, XRechnung and Peppol BIS. Free web tool, API and MCP.

Website Source

At a glance

Type

MCP server

Publisher

invowerk.dev (verified by the MCP Registry)

Status

Working at last check

Tools

6

Token cost

About 2,784 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http xrechnung-e-invoice-validator https://api.invowerk.dev/mcp/

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.xrechnung-e-invoice-validator]
url = "https://api.invowerk.dev/mcp/"

Gemini CLI

{"mcpServers":{"xrechnung-e-invoice-validator":{"httpUrl":"https://api.invowerk.dev/mcp/"}}}

Cursor

{"mcpServers":{"xrechnung-e-invoice-validator":{"url":"https://api.invowerk.dev/mcp/"}}}

VS Code

{"servers":{"xrechnung-e-invoice-validator":{"type":"http","url":"https://api.invowerk.dev/mcp/"}}}

Antigravity

agy mcp add xrechnung-e-invoice-validator https://api.invowerk.dev/mcp/

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"xrechnung-e-invoice-validator","server_url":"https://api.invowerk.dev/mcp/","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"xrechnung-e-invoice-validator","server_url":"https://api.invowerk.dev/mcp/"}

Tools

• convert_invoice ~511 tokens
  Convert an e-invoice to UBL or CII. The result is checked before it is returned. Input: `invoice_base64` is the base64 of an XML invoice or a ZUGFeRD / Factur-X PDF, at most 4 MB decoded; or pass the file as a download link in `file`. `target_syntax` is "ubl" or "cii". `target_flavor` is optional,
• explain_errors ~307 tokens
  Explain rule codes in plain language. Works without an API key. Covers the codes of `validate_invoice` findings and hints: EN 16931, XRechnung, ZUGFeRD and invowerk's own hint codes (IW-*). Input: `codes` is a list of one or more codes, e.g. ["BR-CO-18", "BR-DE-21"]. Duplicates are removed. `lang`
• generate_invoice ~426 tokens
  Create a valid EN 16931 e-invoice (UBL or CII XML) from JSON. Input: `invoice` is a JSON object keyed on EN 16931 Business Terms, the same schema as `POST /v1/generate`, at most 4 MB. Main fields: `syntax` ("ubl" default, or "cii"), `flavor` ("en16931" default, or "xrechnung", which requires `buyer
• parse_invoice ~460 tokens
  Read an existing e-invoice into JSON keyed on EN 16931 Business Terms. The JSON is the input format of `generate_invoice`, so you can edit it and create the invoice again. Input: `invoice_base64` is the base64 of an XML invoice (UBL or CII) or a ZUGFeRD / Factur-X PDF, at most 4 MB decoded; or pas
• render_invoice ~478 tokens
  Render an XML e-invoice (UBL or CII, e.g. XRechnung) as a readable HTML page. invowerk uses the KoSIT XRechnung visualization. Use it to show a person what an e-invoice contains. Input: `invoice_base64` is the base64 of the XML, at most 4 MB decoded, or pass the file as a download link in `file`.
• validate_invoice ~602 tokens
  Check an e-invoice against EN 16931 and German rules. Input: `invoice_base64` is the base64 of an XML invoice (UBL or CII) or a ZUGFeRD / Factur-X PDF, at most 4 MB decoded; or pass the file as a download link in `file`. `explain=true` adds an explanation to findings whose rule has one, in `lang` (

Browse

• PDF tools
• Invoicing and accounting

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