Function Call Response

Message containing the result of a function call, sent by client or server

Voice Agent

The FunctionCallResponse message contains the result of a function call. It is usually sent by the client in response to a FunctionCallRequest, but may also be sent by the server if the function was handled internally (When a request contained client_side: false).

Purpose

This message completes a function call flow. It provides the output of the function to the agent, regardless of where it was executed.

  • If the request was marked client_side: true, the client sends the FunctionCallResponse.
  • If the request had client_side: false, the server sends this message after processing the function.

Fields

  • type: Always "FunctionCallResponse".
  • id: The ID of the original function call (optional but recommended for traceability).
  • name: The name of the function that was called.
  • content: A text summary or result of the function’s output. This is often passed to the next step in the conversation, or parsed if it contains encoded text (i.e. JSON).

Example payload

1{
2  "type": "FunctionCallResponse",
3  "id": "fc_12345678-90ab-cdef-1234-567890abcdef",
4  "name": "get_weather",
5  "content": "{\"location\": \"Fremont, CA 94539\", \"temperature_c\": 21, \"condition\": \"Sunny\", \"humidity\": 40, \"wind_kph\": 14}"
6}

In this example, the client (or server) returns the result of calling the get_weather function.

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