How to Use the Lexware Office (Accounting & Invoicing) MCP in Claude

Q: How do I connect the Lexware Office (Accounting & Invoicing) MCP Server to my Claude Desktop app?

Open your claudedesktopconfig.json file and add the server config under the mcpServers key. Once you restart the app, the hammer icon in your chat window will show all 14 accounting tools.

Q: How does the server handle German tax rates and DATEV posting categories?

The listpostingcategories tool retrieves your pre-configured accounts directly from Lexoffice. Your agent uses this live schema to ensure any new contact or voucher matches your specific tax setup.

Control your Lexware Office bookkeeping directly from Claude Desktop by pulling real-time invoices and managing German customer records.

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Connect Lexware Office (Accounting & Invoicing) MCP to Claude Desktop

Create your Vinkius account to connect Lexware Office (Accounting & Invoicing) to Claude Desktop and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Lexware Office (Accounting & Invoicing) with Claude Desktop

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Audit German Vouchers with Claude Desktop

The `list_vouchers` tool pulls your entire feed of expense and income records directly into your local workspace via this MCP Server. Your agent parses these transactions to flag tax mismatches before they hit your tax advisor's desk. You don't have to export CSVs anymore. Claude Desktop reads the raw data stream, compares it against your posting rules, and highlights missing receipts in your chat window.

Write Contacts Directly to Lexoffice

The `create_contact` tool registers new customers and suppliers in your Lexware Office database without requiring you to open a browser. It formats names and maps roles automatically based on your conversation history. If you need to double-check an address first, `get_contact` pulls the existing record instantly. This keeps your master data clean and prevents duplicate entries during busy sales cycles.

Track Outstanding Invoices and Payments

The `list_invoices` tool fetches your complete history of billed invoices, sorted chronologically so you see what's pending. Your agent scans this list to identify overdue payments and draft polite follow-up emails in seconds. For granular details, `get_invoice` pulls specific tax breakdowns, net amounts, and payment status indicators. You get immediate clarity on cash flow without manual ledger lookups.

Setup guide

Set up Lexware Office (Accounting & Invoicing) MCP in Claude Web or Desktop

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.
3

Start a conversation

Open a new chat. The Lexware Office (Accounting & Invoicing) MCP tools are available immediately — no restart needed.

Endpoint URL

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

No configuration file needed — paste the URL directly in the Claude web interface.

Available on Free (1 connector), Pro, Max, Team, and Enterprise plans.

Prerequisites

Claude Desktop installed (macOS or Windows)
Active Vinkius subscription with a valid endpoint token

1

Open Claude Desktop Settings

Click the menu icon at the top-left corner, go to Settings → Developer → Edit Config. This opens claude_desktop_config.json in your default text editor.
2

Paste the Lexware Office (Accounting & Invoicing) MCP configuration

Copy the JSON snippet on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Desktop

Close and reopen the application. Claude needs a full restart to load new MCPs — refreshing a conversation is not enough.
4

Verify the connection

Open a new conversation. Click the 🔌 icon at the bottom of the message input. You should see tools listed under lexware-office-accounting-invoicing-mcp.

json

{
  "mcpServers": {
    "lexware-office-accounting-invoicing-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Lexware Office. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about Lexware Office (Accounting & Invoicing) MCP in Claude Desktop

Open your `claude_desktop_config.json` file and add the server config under the `mcpServers` key. Once you restart the app, the hammer icon in your chat window will show all 14 accounting tools.

Yes. You can feed your bank export text into the chat, and your agent will use `list_vouchers` and `list_posting_categories` to match transactions with the correct ledger accounts.

Absolutely. You can add this MCP server as a custom connector in your claude.ai settings by pasting the secure Vinkius URL, which enables the tools on any browser-equipped device.

The `list_posting_categories` tool retrieves your pre-configured accounts directly from Lexoffice. Your agent uses this live schema to ensure any new contact or voucher matches your specific tax setup.

Vinkius runs this MCP server inside a zero-trust, ephemeral V8 isolate. Your financial data, invoices, and customer contacts never persist on our servers; they flow directly between your local client and the Lexoffice API.

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