# ToolCallArgsEvent

# Interface: ToolCallArgsEvent

Defined in: [packages/ai/src/types.ts:1270](https://github.com/TanStack/ai/blob/main/packages/ai/src/types.ts#L1270)

Emitted when tool call arguments are streaming.

@ag-ui/core provides: `toolCallId`, `delta`

## Extends

- `ToolCallArgsEvent`

## Indexable

```ts
[k: string]: unknown
```