# RunStepDeltaStepDetailsToolCallsObject
## Properties
**r#type** | **String** | Always `tool_calls`. |
**tool_calls** | Option<[**Vec<models::RunStepDeltaStepDetailsToolCallsObjectToolCallsInner>**](RunStepDeltaStepDetailsToolCallsObject_tool_calls_inner.md)> | An array of tool calls the run step was involved in. These can be associated with one of three types of tools: `code_interpreter`, `file_search`, or `function`. | [optional]
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