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Event emitted when a custom tool call’s freeform input is being streamed. Mirrors response.function_call_arguments.delta but for custom tools whose input is opaque text rather than JSON arguments.

Fields

FieldTypeRequiredDescription
Deltastring:heavy_check_mark:N/A
ItemIDstring:heavy_check_mark:N/A
OutputIndexint64:heavy_check_mark:N/A
SequenceNumberint64:heavy_check_mark:N/A
Typecomponents.CustomToolCallInputDeltaEventType:heavy_check_mark:N/A