会话更新
发送此事件以更新会话的默认配置。客户可以
随时发送此事件以更新会话配置，以及任何
字段可能随时更新，但 “voice” 除外。服务器将响应
替换为session.updated事件，该事件显示完整的有效配置。
只有存在的字段才会更新，因此清除
字段（如 “instructions” ）用于传递空字符串。
对象 session.update
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{
"event_id": "event_123",
"type": "session.update",
"session": {
"modalities": ["text", "audio"],
"instructions": "You are a helpful assistant.",
"voice": "sage",
"input_audio_format": "pcm16",
"output_audio_format": "pcm16",
"input_audio_transcription": {
"model": "whisper-1"
},
"turn_detection": {
"type": "server_vad",
"threshold": 0.5,
"prefix_padding_ms": 300,
"silence_duration_ms": 500
},
"tools": [
{
"type": "function",
"name": "get_weather",
"description": "Get the current weather...",
"parameters": {
"type": "object",
"properties": {
"location": { "type": "string" }
},
"required": ["location"]
}
}
],
"tool_choice": "auto",
"temperature": 0.8,
"max_response_output_tokens": "inf"
}
}