> ## Documentation Index
> Fetch the complete documentation index at: https://gofastmcp.com/llms.txt
> Use this file to discover all available pages before exploring further.
# async_utils
# `fastmcp.utilities.async_utils`
Async utilities for FastMCP.
## Functions
### `is_coroutine_function`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
is_coroutine_function(fn: Any) -> bool
```
Check if a callable is a coroutine function, unwrapping functools.partial.
`inspect.iscoroutinefunction` returns `False` for
`functools.partial` objects wrapping an async function on Python \< 3.12.
This helper unwraps any layers of `partial` before checking.
### `call_sync_fn_in_threadpool`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
call_sync_fn_in_threadpool(fn: Callable[..., Any], *args: Any, **kwargs: Any) -> Any
```
Call a sync function in a threadpool to avoid blocking the event loop.
Uses anyio.to\_thread.run\_sync which properly propagates contextvars,
making this safe for functions that depend on context (like dependency injection).
### `gather`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
gather(*awaitables: Awaitable[T]) -> list[T] | list[T | BaseException]
```
Run awaitables concurrently and return results in order.
Uses anyio TaskGroup for structured concurrency.
**Args:**
* `*awaitables`: Awaitables to run concurrently
* `return_exceptions`: If True, exceptions are returned in results.
If False, first exception cancels all and raises.
**Returns:**
* List of results in the same order as input awaitables.