chore: replace debug print statements with logging

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

patterns/langgraph-single-agent/langgraph_agent.py

@@ -6,7 +6,6 @@
 import base64
 import json
 import os
-import traceback
 import logging
 
 from ag_ui.core import RunAgentInput, RunErrorEvent, RunFinishedEvent
@@ -135,10 +134,8 @@ async def create_langgraph_agent(tools: list):
             system_prompt=SYSTEM_PROMPT,
             state_schema=AgentState,  # extends BaseAgentState with todos: list[Todo]
         )
-    except Exception as error:
-        print(f"[AGENT ERROR] Error creating LangGraph agent: {error}")
-        print(f"[AGENT ERROR] Exception type: {type(error).__name__}")
-        traceback.print_exc()
+    except Exception:
+        logging.exception("Error creating LangGraph agent")
         raise