# is_async

> **Function** in `langsmith`

📖 [View in docs](https://reference.langchain.com/python/langsmith/run_helpers/is_async)

Inspect function or wrapped function to see if it is async.

## Signature

```python
is_async(
    func: Callable,
) -> bool
```

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[View source on GitHub](https://github.com/langchain-ai/langsmith-sdk/blob/c2450d95237768ddd7e77a60f4939f164fca3e8d/python/langsmith/run_helpers.py#L254)