item_id: str

The ID of the item this summary part is associated with.

output_index: int

The index of the output item this summary part is associated with.

part: Part

The summary part that was added.

text: str

The text of the summary part.

type: Literal["summary_text"]

The type of the summary part. Always summary_text.

sequence_number: int

The sequence number of this event.

summary_index: int

The index of the summary part within the reasoning summary.

type: Literal["response.reasoning_summary_part.added"]

The type of the event. Always response.reasoning_summary_part.added.

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.