Update agent.py

agent.py

@@ -19,7 +19,7 @@ from .prompt import system_prompt
 
 llm = ChatOpenAI(
     model="gpt-4.1-nano",
-    api_key=os.getenv("OPENAI_API_KEY"),
+    api_key=os.getenv["OPENAI_API_KEY"],
     temperature=0
 )