delta: str

The function-call arguments delta that is added.

item_id: str

The ID of the output item that the function-call arguments delta is added to.

output_index: int

The index of the output item that the function-call arguments delta is added to.

sequence_number: int

The sequence number of this event.

type: Literal["response.function_call_arguments.delta"]

The type of the event. Always response.function_call_arguments.delta.

agent: Optional[Agent]

The agent that owns this multi-agent streaming event.

agent_name: str

The canonical name of the agent that produced this item.