---
url: >-
  https://adk.nht.io/api/@nhtio/adk/batteries/llm/openai_responses/types/interfaces/OpenAIResponsesOutputItemAddedEvent.md
description: >-
  SSE event emitted when a new output item is opened (streaming begins for that
  item).
---

# Interface: OpenAIResponsesOutputItemAddedEvent

Defined in: [src/batteries/llm/openai\_responses/types.ts:314](https://github.com/NHTIO/ADK/blob/v1.20261003.0/src/src/batteries/llm/openai_responses/types.ts#L314)

SSE event emitted when a new output item is opened (streaming begins for that item).

## Extends

* `OpenAIResponsesStreamEventBase`

## Properties

| Property                                                 | Type                                                                        | Description                                                                               | Overrides                             | Inherited from                                   | Defined in                                                                                                                                              |
| -------------------------------------------------------- | --------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------- | ------------------------------------- | ------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------- |
|  `item`                        | [`OpenAIResponsesOutputItem`](../type-aliases/OpenAIResponsesOutputItem.md) | The item as it stood at the moment it was opened (fields fill in as later deltas arrive). | -                                     | -                                                | [src/batteries/llm/openai\_responses/types.ts:320](https://github.com/NHTIO/ADK/blob/v1.20261003.0/src/src/batteries/llm/openai_responses/types.ts#L320) |
|  `output_index`        | `number`                                                                    | The index of the newly-opened item within `response.output`.                              | -                                     | -                                                | [src/batteries/llm/openai\_responses/types.ts:318](https://github.com/NHTIO/ADK/blob/v1.20261003.0/src/src/batteries/llm/openai_responses/types.ts#L318) |
|  `sequence_number?` | `number`                                                                    | Monotonically increasing sequence number for this event within the stream.                | -                                     | `OpenAIResponsesStreamEventBase.sequence_number` | [src/batteries/llm/openai\_responses/types.ts:310](https://github.com/NHTIO/ADK/blob/v1.20261003.0/src/src/batteries/llm/openai_responses/types.ts#L310) |
|  `type`                        | `"response.output_item.added"`                                              | Event-type discriminator; always `'response.output_item.added'`.                          | `OpenAIResponsesStreamEventBase.type` | -                                                | [src/batteries/llm/openai\_responses/types.ts:316](https://github.com/NHTIO/ADK/blob/v1.20261003.0/src/src/batteries/llm/openai_responses/types.ts#L316) |