# private_state_field_names

> **Function** in `deepagents`

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

Return fields annotated with `PrivateStateAttr` across state schemas.

## Signature

```python
private_state_field_names(
    *state_schemas: type[object] = (),
) -> frozenset[str]
```

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[View source on GitHub](https://github.com/langchain-ai/deepagents/blob/7e70065200007896336f38fe905803e6763e8f85/libs/deepagents/deepagents/middleware/_state.py#L11)