# SystemMessageChunk

> **Class** in `langchain_core`

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

System Message chunk.

## Signature

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

## Extends

- `SystemMessage`
- `BaseMessageChunk`

## Properties

- `type`

---

[View source on GitHub](https://github.com/langchain-ai/langchain/blob/fb6ab993a73180538f6cca876b3c85d46c08845f/libs/core/langchain_core/messages/system.py#L63)