# SummarizationState

> **Class** in `deepagents`

📖 [View in docs](https://reference.langchain.com/python/deepagents/middleware/summarization/SummarizationState)

State for the summarization middleware.

Extends AgentState with a private field for tracking summarization events.

## Signature

```python
SummarizationState()
```

## Extends

- `AgentState`

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[View source on GitHub](https://github.com/langchain-ai/deepagents/blob/a9e6e4f7ad7fe161dd9affc3d74bb19784aca70b/libs/deepagents/deepagents/middleware/summarization.py#L152)