I need an agent that if the user starts speking french , answer in french , in the user starts speaking in german. answer in german ,etc

Vapi supports multilingual assistants by letting you configure transcribers and voices for different languages, but there is no direct documentation confirming fully automatic, real-time language switching during a call. You can set up multilingual support like this:

json
{
  "voice": {
    "provider": "azure",
    "voiceId": "es-ES-ElviraNeural"
  }
}

To handle dynamic switching, you may need to implement custom logic to detect language changes and update the assistant's configuration via the API. Monitor the [multilingual support docs](https://docs.vapi.ai/customization/multilingual) for future enhancements. Source: - [Vapi Multilingual Support Documentation](https://docs.vapi.ai/customization/multilingual)

in that page i do not see any example on how to do the dynamic switch

Use a multilingual transcriber like Deepgram or Whisper, ensure your LLM handles both languages, choose TTS voices for French and German, and write a system prompt instructing the agent to respond in the user’s detected language..