Gemini tool configuration and usage

{
    "model": "gemini-1.5-pro",
    "max_tokens": 200,
    "stream": false,
    "messages": [
        {
            "role": "system",
            "content": "Say Hi"
        },
        {
            "role": "user",
            "content": "Hey, what is the temperature in San Francisco in Celsius? Also tell me the current time"
        }
    ],
    "tool_choice": "required",
    "tools": [
      ....    
    ]
}