Update app.py

app.py

@@ -10,7 +10,7 @@ from langchain_core.runnables import Runnable
 from langchain_core.agents import AgentFinish
 from langchain.agents import create_react_agent
 from langchain.agents.agent import RunnableAgent
-from langchain.agents.tools import Tool
+from langchain.tools import Tool
 from langchain_core.messages import HumanMessage
 from langchain_google_genai import ChatGoogleGenerativeAI
 
@@ -19,7 +19,7 @@ from langchain_google_genai import ChatGoogleGenerativeAI
 # --- Constants ---
 DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
 
-OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
+GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")
 
 
 # --- Basic Agent Definition ---