---
title: "FunctionCallArgsDeltaEvent"
---

Event emitted when function call arguments are being streamed


## Fields

| Field                                                                                        | Type                                                                                         | Required                                                                                     | Description                                                                                  |
| -------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------- |
| `delta`                                                                                      | *str*                                                                                        | :heavy_check_mark:                                                                           | N/A                                                                                          |
| `item_id`                                                                                    | *str*                                                                                        | :heavy_check_mark:                                                                           | N/A                                                                                          |
| `output_index`                                                                               | *int*                                                                                        | :heavy_check_mark:                                                                           | N/A                                                                                          |
| `sequence_number`                                                                            | *int*                                                                                        | :heavy_check_mark:                                                                           | N/A                                                                                          |
| `type`                                                                                       | [components.FunctionCallArgsDeltaEventType](../components/functioncallargsdeltaeventtype.mdx) | :heavy_check_mark:                                                                           | N/A                                                                                          |