> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-5b6e02fd.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# ChatStreamingMessageToolCall - TypeScript SDK

> ChatStreamingMessageToolCall method reference

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

## Example Usage

```typescript lines theme={null}
import { ChatStreamingMessageToolCall } from "@openrouter/sdk/models";

let value: ChatStreamingMessageToolCall = {
  index: 3974.82,
};
```

## Fields

| Field      | Type                                                                                                               | Required             | Description |
| ---------- | ------------------------------------------------------------------------------------------------------------------ | -------------------- | ----------- |
| `index`    | *number*                                                                                                           | :heavy\_check\_mark: | N/A         |
| `id`       | *string*                                                                                                           | :heavy\_minus\_sign: | N/A         |
| `type`     | *"function"*                                                                                                       | :heavy\_minus\_sign: | N/A         |
| `function` | [models.ChatStreamingMessageToolCallFunction](/client-sdks/typescript/models/chatstreamingmessagetoolcallfunction) | :heavy\_minus\_sign: | N/A         |