# RealtimeBetaClientEventConversationItemTruncate
## Properties
**event_id** | Option<**String**> | Optional client-generated ID used to identify this event. | [optional]
**r#type** | **String** | The event type, must be `conversation.item.truncate`. |
**item_id** | **String** | The ID of the assistant message item to truncate. Only assistant message items can be truncated. |
**content_index** | **i32** | The index of the content part to truncate. Set this to 0. |
**audio_end_ms** | **i32** | Inclusive duration up to which audio is truncated, in milliseconds. If the audio_end_ms is greater than the actual audio duration, the server will respond with an error. |
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