delta: str

The incremental input data (delta) for the custom tool call.

item_id: str

Unique identifier for the API item associated with this event.

output_index: int

The index of the output this delta applies to.

sequence_number: int

The sequence number of this event.

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

The event type identifier.

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.