Instantiating an Agent with a non-string name (e.g. an integer) does not perform type validation, causing downstream errors when the SDK assumes name is a string.

from agents import Agent # Pass an integer instead of a string agent = Agent(name=1) # Use the agent response = agent.run_sync(agent , "Hello!")

Observe: no exception is raised at instantiation, but later calls fail (e.g. JSON serialization errors).

Sloution for this behavior:

if not isinstance(name, str): raise TypeError(f"Agent name must be a string, got {type(name).__name__}")