feat(bedrock): async client support via asyncio.to_thread

docs/integrations/bedrock.md

@@ -88,6 +88,8 @@ print(user)
 > **Warning:**
 > AWS Bedrock's official SDK (`boto3`) does not support async natively. If you need to call Bedrock from async code, you can use `asyncio.to_thread` to run synchronous Bedrock calls in a non-blocking way.
 
+AWS's boto3 Bedrock client does **not** natively support asynchronous operations. To enable async usage, Instructor wraps the synchronous client using Python's `asyncio.to_thread`, which runs blocking calls in a thread pool. This allows you to use Bedrock in async applications without blocking the event loop, but note that true network-level async is not possible until boto3 adds support.
+
 ```python
 import instructor
 from pydantic import BaseModel

instructor/client_bedrock.py

@@ -9,6 +9,8 @@
 import instructor
 from instructor.client import AsyncInstructor, Instructor
 
+import asyncio
+
 
 @overload  # type: ignore
 def from_bedrock(
@@ -47,7 +49,19 @@ def from_bedrock(
     **kwargs: Any,
 ) -> Instructor | AsyncInstructor:
     """
-    Accepts both 'async_client' (preferred) and '_async' (deprecated) for async mode.
+    Create an Instructor or AsyncInstructor client for AWS Bedrock.
+
+    Args:
+        client (BaseClient): A boto3 Bedrock client instance.
+        mode (instructor.Mode): The mode to use (BEDROCK_TOOLS or BEDROCK_JSON).
+        _async (bool): If True, returns an AsyncInstructor that runs client.converse in a thread using asyncio.to_thread.
+        **kwargs: Additional keyword arguments passed to the Instructor/AsyncInstructor.
+
+    Returns:
+        Instructor or AsyncInstructor: The appropriate client for synchronous or asynchronous usage.
+
+    Note:
+        The async client is a wrapper around the synchronous boto3 client, using asyncio.to_thread to enable non-blocking calls in async applications.
     """
     valid_modes = {
         instructor.Mode.BEDROCK_TOOLS,
@@ -83,7 +97,7 @@ def from_bedrock(
     use_async = async_client or (_async is not None and _async is True)
 
     async def async_wrapper(**kwargs: Any):
-        return client.converse(**kwargs)
+        return await asyncio.to_thread(client.converse, **kwargs)
 
     create = client.converse