import logging
from strands import Agent
from strands.models.bedrock import BedrockModel

sonnet4 = BedrockModel(
    max_tokens=4096,
    model_id="us.anthropic.claude-sonnet-4-20250514-v1:0",
    params={
        "temperature": 0.5,
    }
)

logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger(__name__)

agent = Agent(
    model=sonnet4,
    tools=[],
    system_prompt="You are a helpful assistant"
)
print(f"About to call agent(None)")
try:
    response = agent(None)
    print(f"SUCCESS: Agent handled None message")
    print(f"Response type: {type(response)}")
    print(f"Response: {response}")
except Exception as e:
    print(f"EXCEPTION: Agent failed with None message")
    print(f"Exception type: {type(e)}")
    print(f"Exception message: {e}")