item_id: str

The unique identifier of the image generation item being processed.

output_index: int

The index of the output item in the response’s output array.

sequence_number: int

The sequence number of the image generation item being processed.

type: Literal["response.image_generation_call.generating"]

The type of the event. Always ‘response.image_generation_call.generating’.

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.