# ToolMessageChunk

> **Class** in `langchain_core`

📖 [View in docs](https://reference.langchain.com/python/langchain-core/messages/tool/ToolMessageChunk)

Tool Message chunk.

## Signature

```python
ToolMessageChunk(
    self,
    content: str | list[str | dict] | None = None,
    content_blocks: list[types.ContentBlock] | None = None,
    **kwargs: Any = {},
)
```

## Extends

- `ToolMessage`
- `BaseMessageChunk`

## Properties

- `type`

---

[View source on GitHub](https://github.com/langchain-ai/langchain/blob/c59e83a1ffba63d709ea4847445845edd82085dc/libs/core/langchain_core/messages/tool.py#L174)