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.

partial_image_b64: str

Base64-encoded partial image data, suitable for rendering as an image.

partial_image_index: int

0-based index for the partial image (backend is 1-based, but this is 0-based for the user).

sequence_number: int

The sequence number of the image generation item being processed.

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

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

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.

background: Optional[str]

The background setting that was used.

output_format: Optional[str]

The output format that was used.

quality: Optional[str]

The image quality that was used.

size: Optional[str]

The image size that was used.