Update app.py

app.py

@@ -4,6 +4,9 @@ from langgraph.types import Command
 from langchain_core.messages import BaseMessage, HumanMessage
 from langgraph.prebuilt import create_react_agent
 from langchain_anthropic import ChatAnthropic
+import os
+os.environ["ANTHROPIC_API_KEY"] = os.getenv("ANTHROPIC_API_KEY")
+
 
 # Define your LangGraph agents and nodes
 llm = ChatAnthropic(model="claude-3-5-sonnet-latest")