> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-7021d5f4.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# ContentPartAddedEvent - Go SDK

> ContentPartAddedEvent type definition

<Warning>
  The Go SDK and docs are currently in beta.
  Report issues on [GitHub](https://github.com/OpenRouterTeam/go-sdk/issues).
</Warning>

Event emitted when a new content part is added to an output item

## Fields

| Field            | Type                                                                                                   | Required             | Description |
| ---------------- | ------------------------------------------------------------------------------------------------------ | -------------------- | ----------- |
| `ContentIndex`   | `int64`                                                                                                | :heavy\_check\_mark: | N/A         |
| `ItemID`         | `string`                                                                                               | :heavy\_check\_mark: | N/A         |
| `OutputIndex`    | `int64`                                                                                                | :heavy\_check\_mark: | N/A         |
| `Part`           | [components.ContentPartAddedEventPart](/client-sdks/go/api-reference/models/contentpartaddedeventpart) | :heavy\_check\_mark: | N/A         |
| `SequenceNumber` | `int64`                                                                                                | :heavy\_check\_mark: | N/A         |
| `Type`           | [components.ContentPartAddedEventType](/client-sdks/go/api-reference/models/contentpartaddedeventtype) | :heavy\_check\_mark: | N/A         |