# RunStepDeltaStepDetailsToolCallsFunctionObject
## Properties
**index** | **i32** | The index of the tool call in the tool calls array. |
**id** | Option<**String**> | The ID of the tool call object. | [optional]
**r#type** | **String** | The type of tool call. This is always going to be `function` for this type of tool call. |
**function** | Option<[**models::RunStepDeltaStepDetailsToolCallsFunctionObjectFunction**](RunStepDeltaStepDetailsToolCallsFunctionObject_function.md)> | | [optional]
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