# ResponseCustomToolCallInputDeltaEvent
## Properties
**r#type** | **String** | The event type identifier. |
**sequence_number** | **i32** | The sequence number of this event. |
**output_index** | **i32** | The index of the output this delta applies to. |
**item_id** | **String** | Unique identifier for the API item associated with this event. |
**delta** | **String** | The incremental input data (delta) for the custom tool call. |
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