Open WebUI

Connect Open WebUI to the Klardaten DATEV MCP server via OAuth 2.1.

  1. In the admin panel, open Settings → Integrations.
Open WebUI: Open admin panel then navigate to Settings → Integrations
  1. Under "Manage Tool Servers", click Add (+).
  2. Set the connection type to "MCP Streamable HTTP" (not OpenAPI).
  3. Fill in the connection details:
    • Name: Klardaten
    • ID: e.g. klardaten
    • URL: https://api.klardaten.com/mcp
  4. For authentication, choose "OAuth 2.1".
  5. Click "Register Client" to verify the connection. You can also restrict which users may use the MCP server.
  6. Click "Save" to close the dialog.
Open WebUI: MCP Streamable HTTP tool server settings

Use the MCP server in a chat

  1. Open a new chat.
  2. Choose Tools → Klardaten to start the OAuth login flow.
Open WebUI: selecting Klardaten tools in a chat

On the login screen, sign in with either:

  • your Klardaten user email and password, or
  • your user API key
OAuth login screen for MCP

Once you confirm, the tool is available in the chat.

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