# ToolCallChunk

> **Interface** in `@langchain/core`

📖 [View in docs](https://reference.langchain.com/javascript/langchain-core/messages/ContentBlock/Tools/ToolCallChunk)

Content block to represent partial data of a tool call

## Signature

```javascript
interface ToolCallChunk
```

## Extends

- `BaseContentBlock`

## Properties

- `args`
- `id`
- `index`
- `name`
- `type`

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[View source on GitHub](https://github.com/langchain-ai/langchainjs/blob/e493ed653d734e31a8d051f78ab29b067f530e4b/libs/langchain-core/src/messages/content/tools.ts#L50)