const { response, stream } = ai.generateStream({
      model: vertexAI.model('gemini-3-pro-preview'),
      config: {
        functionCallingConfig: {
          streamFunctionCallArguments: true,
        },
      },
      tools: [...],
    });

    for await (const chunk of stream) {
      if (chunk.toolRequest?.partial) {
        console.log('partial'); 
      }  else {
        console.log('final'); 
      }
    }