[BUG] Agent hangs when agent(None) is passed #642
Description
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
dev
Python Version
3.12
Operating System
macOS
Installation Method
git clone
Steps to Reproduce
Code:
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}")Expected Behavior
Does not hang
Actual Behavior
It hangs and never ends!
Additional Context
Probably because nothing is ever added to the queue:
sdk-python/src/strands/models/bedrock.py
Line 395 in 8b1de4d
Possible Solution
No response
Related Issues
No response