Update agent_langchain.py

agent_langchain.py

@@ -4,6 +4,10 @@ from datetime import date
 from langchain.agents import AgentType, initialize_agent, load_tools, tool
 from langchain.chat_models import ChatOpenAI
 
+LANGCHAIN_TRACING_V2 = true
+LANGCHAIN_ENDPOINT   = "https://api.smith.langchain.com"
+LANGCHAIN_API_KEY    = os.environ["LANGSMITH_API_KEY"]
+
 @tool
 def today_tool(text: str) -> str:
     """Returns today's date. Use this for any questions related to knowing today's date.