Codex

Connect Codex to the Klardaten DATEV MCP server with the app UI or CLI.

Set up in Codex

  1. Open Settings in Codex.
Codex: Settings menu opened from the account menu
  1. Select MCP servers.
  2. Click Add server.
Codex: MCP servers settings with Add server
  1. Enter a server name, for example klardaten.
  2. Select Streamable HTTP and set the URL to https://api.klardaten.com/mcp.
  3. Click Save.
Codex: custom MCP server setup with Streamable HTTP URL
  1. If the server does not appear immediately, restart Codex and return to MCP servers.
Codex: MCP server listed after setup
  1. Click Authenticate for the server. Codex opens the Klardaten OAuth flow in your browser.
  2. Complete OAuth, then return to Codex.
  3. In chat, ask Codex to use the MCP server by the name you configured.

Set up with the CLI

You can also add the same server from the terminal:

Terminal
codex mcp add klardaten --url https://api.klardaten.com/mcp
  1. Complete the OAuth flow in the browser window Codex opens.
  2. Run codex mcp list to verify that the server is configured.

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