Fix handoff workflow context management and improve AG-UI demo (#5136)

python/samples/03-workflows/agents/handoff_workflow_as_agent.py

@@ -80,6 +80,7 @@ def create_agents(client: FoundryChatClient) -> tuple[Agent, Agent, Agent, Agent
             "based on the problem described."
         ),
         name="triage_agent",
+        require_per_service_call_history_persistence=True,
     )
 
     # Refund specialist: Handles refund requests
@@ -89,6 +90,7 @@ def create_agents(client: FoundryChatClient) -> tuple[Agent, Agent, Agent, Agent
         name="refund_agent",
         # In a real application, an agent can have multiple tools; here we keep it simple
         tools=[process_refund],
+        require_per_service_call_history_persistence=True,
     )
 
     # Order/shipping specialist: Resolves delivery issues
@@ -98,6 +100,7 @@ def create_agents(client: FoundryChatClient) -> tuple[Agent, Agent, Agent, Agent
         name="order_agent",
         # In a real application, an agent can have multiple tools; here we keep it simple
         tools=[check_order_status],
+        require_per_service_call_history_persistence=True,
     )
 
     # Return specialist: Handles return requests
@@ -107,6 +110,7 @@ def create_agents(client: FoundryChatClient) -> tuple[Agent, Agent, Agent, Agent
         name="return_agent",
         # In a real application, an agent can have multiple tools; here we keep it simple
         tools=[process_return],
+        require_per_service_call_history_persistence=True,
     )
 
     return triage_agent, refund_agent, order_agent, return_agent