async def _asyncio_to_thread(
        func: Callable[T_ParamSpec, T_Retval], /, *args: T_ParamSpec.args, **kwargs: T_ParamSpec.kwargs
    ) -> Any:
        """Asynchronously run function *func* in a separate thread.

        Any *args and **kwargs supplied for this function are directly passed
        to *func*. Also, the current :class:`contextvars.Context` is propagated,
        allowing context variables from the main thread to be accessed in the
        separate thread.

        Returns a coroutine that can be awaited to get the eventual result of *func*.
        """
        loop = asyncio.events.get_running_loop()
        ctx = contextvars.copy_context()
        func_call = functools.partial(ctx.run, func, *args, **kwargs)
        return await loop.run_in_executor(None, func_call)
Asynchronously run function *func* in a separate thread.

        Any *args and **kwargs supplied for this function are directly passed
        to *func*. Also, the current :class:`contextvars.Context` is propagated,
        allowing context variables from the main thread to be accessed in the
        separate thread.

        Returns a coroutine that can be awaited to get the eventual result of *func*.
        
src/anthropic/_utils/_sync.py