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[BUG] use_aws with Nova model #519

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[BUG] use_aws with Nova model#519
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bugSomething isn't working
@rprentyaws

Description

@rprentyaws
rprentyaws
opened on Jul 23, 2025

Checks

  • I have updated to the lastest minor and patch version of Strands
  • I have checked the documentation and this is not expected behavior
  • I have searched ./issues and there are no duplicates of my issue

Strands Version

1.0.1

Python Version

3.13.3

Operating System

MacOS 15.5

Installation Method

pip

Steps to Reproduce

Use the use_aws with a very large prompt. If you DM me internally, I can send you the full app and prompt.

api_spec = 
sonnet37_eu = "eu.anthropic.claude-3-7-sonnet-20250219-v1:0"
sonnet37_us = "us.anthropic.claude-3-7-sonnet-20250219-v1:0"
novapro_eu = "eu.amazon.nova-pro-v1:0"
novapro_us = "us.amazon.nova-pro-v1:0"

model = novapro_us 
region = "us-east-1"

boto_config = BotocoreConfig(
    read_timeout=3600,
    retries={'max_attempts': 5},
    connect_timeout=3600
)

bedrock_model = BedrockModel(
    model_id=model, 
    region_name=region,
    boto_client_config=boto_config
)

agent = Agent(model=bedrock_model, tools=[use_aws])
prompt = "<<<ping me internally for this>>>"
agent(prompt)

Expected Behavior

The use_aws tool should succeed in its operation against the respective AWS service.

If I invoke use_aws directly, it works:

result = agent.tool.use_aws(
     service_name="xxx", 
     operation_name="xxx",
     parameters={xxx},
     region="us-east-1",
     label="do xxx"
 )

However, when the agent invokes it, it does not work:

agent(agent_prompt)

Actual Behavior

Invocation logs only show this:

{
    "timestamp": "2025-07-23T08:36:01Z",
    "accountId": "xxx",
    "identity": {
        "arn": "xxx"
    },
    "region": "us-east-1",
    "requestId": "03158d6a-38ba-4177-8478-b085d741b516",
    "operation": "ConverseStream",
    "modelId": "us.amazon.nova-pro-v1:0",
    "errorCode": "ModelErrorException",
    "inferenceRegion": "us-west-2",
    "schemaType": "ModelInvocationLog",
    "schemaVersion": "1.0"
}

Error on the client from running python app.py:

Traceback (most recent call last):
  File "/Users/rprenty/Desktop/Importer/app.py", line 83, in <module>
    try:
    
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 377, in __call__
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/concurrent/futures/_base.py", line 456, in result
    return self.__get_result()
           ~~~~~~~~~~~~~~~~~^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/concurrent/futures/_base.py", line 401, in __get_result
    raise self._exception
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/concurrent/futures/thread.py", line 59, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/opentelemetry/instrumentation/threading/__init__.py", line 171, in wrapped_func
    return original_func(*func_args, **func_kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 373, in execute
    return asyncio.run(self.invoke_async(prompt, **kwargs))
           ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/asyncio/runners.py", line 195, in run
    return runner.run(main)
           ~~~~~~~~~~^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/asyncio/base_events.py", line 719, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 398, in invoke_async
    async for event in events:
        _ = event
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 508, in stream_async
    async for event in events:
    ...<2 lines>...
            yield event["callback"]
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 544, in _run_loop
    async for event in events:
    ...<13 lines>...
        yield event
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 583, in _execute_event_loop_cycle
    async for event in events:
        yield event
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/event_loop/event_loop.py", line 187, in event_loop_cycle
    raise e
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/event_loop/event_loop.py", line 132, in event_loop_cycle
    async for event in stream_messages(agent.model, agent.system_prompt, agent.messages, tool_specs):
    ...<6 lines>...
            }
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/event_loop/streaming.py", line 318, in stream_messages
    async for event in process_stream(chunks):
        yield event
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/event_loop/streaming.py", line 273, in process_stream
    async for chunk in chunks:
    ...<16 lines>...
            handle_redact_content(chunk["redactContent"], state)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/models/bedrock.py", line 350, in stream
    await task
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/asyncio/threads.py", line 25, in to_thread
    return await loop.run_in_executor(None, func_call)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/concurrent/futures/thread.py", line 59, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/opentelemetry/instrumentation/threading/__init__.py", line 171, in wrapped_func
    return original_func(*func_args, **func_kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/models/bedrock.py", line 385, in _stream
    for chunk in response["stream"]:
                 ~~~~~~~~^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/botocore/eventstream.py", line 591, in __iter__
    for event in self._event_generator:
                 ^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/botocore/eventstream.py", line 598, in _create_raw_event_generator
    for chunk in self._raw_stream.stream():
                 ~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/urllib3/response.py", line 1063, in stream
    yield from self.read_chunked(amt, decode_content=decode_content)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/urllib3/response.py", line 1219, in read_chunked
    self._update_chunk_length()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/urllib3/response.py", line 1149, in _update_chunk_length
    raise ProtocolError("Response ended prematurely") from None
urllib3.exceptions.ProtocolError: Response ended prematurely
2025-07-23 09:39:08,905 | ERROR | root | Full stack trace:
  File "/Users/rprenty/Desktop/Importer/app.py", line 83, in <module>
    try:
    
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 377, in __call__
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/concurrent/futures/_base.py", line 456, in result
    return self.__get_result()
           ~~~~~~~~~~~~~~~~~^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/concurrent/futures/_base.py", line 401, in __get_result
    raise self._exception
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/concurrent/futures/thread.py", line 59, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/opentelemetry/instrumentation/threading/__init__.py", line 171, in wrapped_func
    return original_func(*func_args, **func_kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 373, in execute
    return asyncio.run(self.invoke_async(prompt, **kwargs))
           ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/asyncio/runners.py", line 195, in run
    return runner.run(main)
           ~~~~~~~~~~^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/asyncio/base_events.py", line 719, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 398, in invoke_async
    async for event in events:
        _ = event
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 508, in stream_async
    async for event in events:
    ...<2 lines>...
            yield event["callback"]
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 544, in _run_loop
    async for event in events:
    ...<13 lines>...
        yield event
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 583, in _execute_event_loop_cycle
    async for event in events:
        yield event
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/event_loop/event_loop.py", line 187, in event_loop_cycle
    raise e
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/event_loop/event_loop.py", line 132, in event_loop_cycle
    async for event in stream_messages(agent.model, agent.system_prompt, agent.messages, tool_specs):
    ...<6 lines>...
            }
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/event_loop/streaming.py", line 318, in stream_messages
    async for event in process_stream(chunks):
        yield event
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/event_loop/streaming.py", line 273, in process_stream
    async for chunk in chunks:
    ...<16 lines>...
            handle_redact_content(chunk["redactContent"], state)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/models/bedrock.py", line 350, in stream
    await task
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/asyncio/threads.py", line 25, in to_thread
    return await loop.run_in_executor(None, func_call)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/concurrent/futures/thread.py", line 59, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/opentelemetry/instrumentation/threading/__init__.py", line 171, in wrapped_func
    return original_func(*func_args, **func_kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/models/bedrock.py", line 385, in _stream
    for chunk in response["stream"]:
                 ~~~~~~~~^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/botocore/eventstream.py", line 591, in __iter__
    for event in self._event_generator:
                 ^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/botocore/eventstream.py", line 598, in _create_raw_event_generator
    for chunk in self._raw_stream.stream():
                 ~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/urllib3/response.py", line 1063, in stream
    yield from self.read_chunked(amt, decode_content=decode_content)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/urllib3/response.py", line 1219, in read_chunked
    self._update_chunk_length()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/urllib3/response.py", line 1149, in _update_chunk_length
    raise ProtocolError("Response ended prematurely") from None

<thinking> xxx. I will use the use_aws tool to make this call.Traceback (most recent call last):
  File "/Users/rprenty/Desktop/Importer/app.py", line 83, in <module>
    try:
    
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 377, in __call__
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/concurrent/futures/_base.py", line 456, in result
    return self.__get_result()
           ~~~~~~~~~~~~~~~~~^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/concurrent/futures/_base.py", line 401, in __get_result
    raise self._exception
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/concurrent/futures/thread.py", line 59, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/opentelemetry/instrumentation/threading/__init__.py", line 171, in wrapped_func
    return original_func(*func_args, **func_kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 373, in execute
    return asyncio.run(self.invoke_async(prompt, **kwargs))
           ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/asyncio/runners.py", line 195, in run
    return runner.run(main)
           ~~~~~~~~~~^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/asyncio/base_events.py", line 719, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 398, in invoke_async
    async for event in events:
        _ = event
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 508, in stream_async
    async for event in events:
    ...<2 lines>...
            yield event["callback"]
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 544, in _run_loop
    async for event in events:
    ...<13 lines>...
        yield event
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/agent/agent.py", line 583, in _execute_event_loop_cycle
    async for event in events:
        yield event
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/event_loop/event_loop.py", line 187, in event_loop_cycle
    raise e
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/event_loop/event_loop.py", line 132, in event_loop_cycle
    async for event in stream_messages(agent.model, agent.system_prompt, agent.messages, tool_specs):
    ...<6 lines>...
            }
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/event_loop/streaming.py", line 318, in stream_messages
    async for event in process_stream(chunks):
        yield event
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/event_loop/streaming.py", line 273, in process_stream
    async for chunk in chunks:
    ...<16 lines>...
            handle_redact_content(chunk["redactContent"], state)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/models/bedrock.py", line 350, in stream
    await task
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/asyncio/threads.py", line 25, in to_thread
    return await loop.run_in_executor(None, func_call)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/concurrent/futures/thread.py", line 59, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/opentelemetry/instrumentation/threading/__init__.py", line 171, in wrapped_func
    return original_func(*func_args, **func_kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/strands/models/bedrock.py", line 385, in _stream
    for chunk in response["stream"]:
                 ~~~~~~~~^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/botocore/eventstream.py", line 591, in __iter__
    for event in self._event_generator:
                 ^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/botocore/eventstream.py", line 598, in _create_raw_event_generator
    for chunk in self._raw_stream.stream():
                 ~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/urllib3/response.py", line 1063, in stream
    yield from self.read_chunked(amt, decode_content=decode_content)
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/urllib3/response.py", line 1219, in read_chunked
    self._update_chunk_length()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/urllib3/response.py", line 1149, in _update_chunk_length
    raise ProtocolError("Response ended prematurely") from None
urllib3.exceptions.ProtocolError: Response ended prematurely

Additional Context

Like I mentioned, if I invoke use_aws directly, it works. If I lean on the agent itself, it doesn't.

If I reduce the size of my input file, the API operation works when leaning on the agent which leads me to believe this issue is related to max_tokens.

If I use Claude models, the error is more helpful on the invocation logging which includes:

...
            "stopReason": "max_tokens"
...

Possible Solution

No response

Related Issues

No response

Internal tracking id: D277187567

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