Can A2AServer handle multiple concurrent request.

[jnaircsod]

Can you A2A server handle multiple concurrent request. The way A2A Server initialized , it take agent object as parameter. The agent once initialized with a session id. Will this be able to handle concurrent request separately as different session. I have done the implementation but I have facing below issue.

Error
raise error_class(parsed_response, operation_name)
botocore.errorfactory.ValidationException: An error occurred (ValidationException) when calling the ConverseStream operation: Expected toolResult blocks at messages.34.content for the following Ids: tooluse_DkTE_kXERpmGkxxGc31jhw, but found: tooluse__WdnNdJ3RH-cpf42IPlVsA
└ Bedrock region: us-west-2
└ Model id: arn:aws:bedrock:::inference-profile/global.anthropic.claude-sonnet-4-20250514-v1:0
ERROR | strands.multiagent.a2a.executor | Error in streaming execution
Traceback (most recent call last):
File "/root/a2a/.venv/lib64/python3.11/site-packages/strands/event_loop/event_loop.py", line 189, in event_loop_cycle
async for tool_event in tool_events:
File "/root/a2a/.venv/lib64/python3.11/site-packages/strands/event_loop/event_loop.py", line 531, in _handle_tool_execution
async for event in events:
File "/root/a2a/.venv/lib64/python3.11/site-packages/strands/event_loop/event_loop.py", line 277, in recurse_event_loop
async for event in events:
File "/root/a2a/.venv/lib64/python3.11/site-packages/strands/event_loop/event_loop.py", line 152, in event_loop_cycle
async for model_event in model_events:
File "/root/a2a/.venv/lib64/python3.11/site-packages/strands/event_loop/event_loop.py", line 396, in _handle_model_execution
raise e
File "/root/a2a/.venv/lib64/python3.11/site-packages/strands/event_loop/event_loop.py", line 337, in _handle_model_execution
async for event in stream_messages(
File "/root/a2a/.venv/lib64/python3.11/site-packages/strands/event_loop/streaming.py", line 454, in stream_messages
async for event in process_stream(chunks, start_time):
File "/root/a2a/.venv/lib64/python3.11/site-packages/strands/event_loop/streaming.py", line 388, in process_stream
async for chunk in chunks:
File "/root/a2a/.venv/lib64/python3.11/site-packages/strands/models/bedrock.py", line 647, in stream
await task
File "/usr/lib64/python3.11/asyncio/threads.py", line 25, in to_thread
return await loop.run_in_executor(None, func_call)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/concurrent/futures/thread.py", line 58, in run
result = self.fn(*self.args, **self.kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/root/a2a/.venv/lib64/python3.11/site-packages/opentelemetry/instrumentation/threading/init.py", line 171, in wrapped_func
return original_func(*func_args, **func_kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/root/a2a/.venv/lib64/python3.11/site-packages/strands/models/bedrock.py", line 768, in _stream
raise e
File "/root/a2a/.venv/lib64/python3.11/site-packages/strands/models/bedrock.py", line 683, in _stream
response = self.client.converse_stream(**request)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/root/a2a/.venv/lib64/python3.11/site-packages/botocore/client.py", line 602, in _api_call
return self._make_api_call(operation_name, kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/root/a2a/.venv/lib64/python3.11/site-packages/botocore/context.py", line 123, in wrapper
return func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^
File "/root/a2a/.venv/lib64/python3.11/site-packages/botocore/client.py", line 1078, in _make_api_call
raise error_class(parsed_response, operation_name)