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Triggered when the AI determines that a function call is needed during the conversation. Handle this event to execute external API calls, query knowledge bases, or integrate with external systems.

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Event Properties

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type
string
Event type. Always "realtime.response.function_call_arguments.done" for this event.
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data
object
Event data object containing function call information.
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data.arguments
string
JSON string containing function call parameters.Example: "{\"userInput\": \"What's the weather in Beijing?\"}"
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data.call_id
string
Unique identifier for this function call.Example: "call-123456"
{
  "type": "realtime.response.function_call_arguments.done",
  "data": {
    "arguments": "{\"userInput\": \"What's the weather in Beijing?\"}",
    "call_id": "call-123456"
  }
}

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Usage Example

const NavTalkMessageType = Object.freeze({
    REALTIME_RESPONSE_FUNCTION_CALL_ARGUMENTS_DONE: "realtime.response.function_call_arguments.done",
    // ... other event types
});

async function handleReceivedMessage(data) {
    const nav_data = data.data;
    
    switch (data.type) {
        case NavTalkMessageType.REALTIME_RESPONSE_FUNCTION_CALL_ARGUMENTS_DONE:
            const arguments = nav_data.arguments;
            const callId = nav_data.call_id;
            
            // Parse function call arguments
            const functionCallArgs = JSON.parse(arguments);
            
            // Execute function call
            const result = await executeFunctionCall(functionCallArgs);
            
            // Send result back
            sendFunctionCallResult(result, callId);
            break;
    }
}

function sendFunctionCallResult(result, callId) {
    const resultJson = {
        type: "conversation.item.create",
        item: {
            type: "function_call_output",
            output: result,
            call_id: callId
        }
    };
    socket.send(JSON.stringify(resultJson));
    
    // Request AI response
    const rpJson = { type: "response.create" };
    socket.send(JSON.stringify(rpJson));
}
After sending the function call result, always send a response.create message to trigger AI processing.