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

1.17.0

Python Version

3.12

Operating System

Ubuntu 24.04.1

Installation Method

pip

Steps to Reproduce

Simply changing the model_id in GeminiModel to gemini-3-pro-preview from gemini-2.5-flash causes the exception after a tool call:

File "/home/danielp/r-d-pocs/strands-ai-trek/.venv/lib/python3.12/site-packages/google/genai/_api_client.py", line 1225, in _async_request_once
await errors.APIError.raise_for_async_response(response)
File "/home/danielp/r-d-pocs/strands-ai-trek/.venv/lib/python3.12/site-packages/google/genai/errors.py", line 188, in raise_for_async_response
await cls.raise_error_async(status_code, response_json, response)
File "/home/danielp/r-d-pocs/strands-ai-trek/.venv/lib/python3.12/site-packages/google/genai/errors.py", line 210, in raise_error_async
raise ClientError(status_code, response_json, response)
google.genai.errors.ClientError: 400 Bad Request. {'message': '{\n "error": {\n "code": 400,\n "message": "Request contains an invalid argument.",\n "status": "INVALID_ARGUMENT"\n }\n}\n', 'status': 'Bad Request'}

Expected Behavior

Successful execution

Actual Behavior

INVALID_ARGUMENT exception

Additional Context

No response

Possible Solution

No response

Related Issues

No response