Update LG_agent.py

LG_agent.py

@@ -8,24 +8,18 @@ from tools import all_tools
 import os
 
 # 1. Setup once
-OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
-if not OPENAI_API_KEY:
-    raise ValueError("Missing OPENAI_API_KEY environment variable.")
-
 chat = ChatOpenAI(
     model="gpt-3.5-turbo",
-    openai_api_key=OPENAI_API_KEY,
+    openai_api_key=os.getenv("OPENAI_API_KEY"),
     temperature=0,
-)
-
-chat_with_tools = chat.bind_tools(
-    all_tools,
     system_message=(
         "You are a step-by-step reasoning assistant. "
         "Always think out loud, use available tools when appropriate, and aim for factual, complete answers."
     )
 )
 
+chat_with_tools = chat.bind_tools(all_tools)
+
 # 2. Define the agent state
 class AgentState(TypedDict):
     messages: Annotated[list[AnyMessage], add_messages]