Update app.py

app.py

@@ -7,14 +7,14 @@ import time
 import mimetypes
 import pandas as pd
 
-# NEW: LangGraph & LangChain imports
+# LangChain & LangGraph
 from langchain_community.chat_models import ChatOpenAI
 from langgraph.graph import StateGraph, END
 from langgraph.prebuilt import create_react_agent
 
 st.set_page_config(page_title="PDF Tools", layout="wide")
 
-# -------- LLM Model Setup (your unchanged code) --------
+# -------- LLM Model Setup --------
 MODELS = {
     "OpenAI GPT-4.1": {
         "api_url": "https://api.openai.com/v1/chat/completions",
@@ -326,6 +326,7 @@ def build_decision_agent():
         model="gpt-4-1106-preview",
         temperature=0,
         streaming=False,
+        # No 'tools' param, classic ReAct only!
     )
     tools = [
         {
@@ -343,7 +344,7 @@ def build_decision_agent():
     graph_builder.add_edge(agent, END)
     return graph_builder.compile()
 
-if extracted_info and po_df is not None:
+if extracted_info is not None and po_df is not None:
     if st.button("Make a decision (AI Agent)"):
         with st.spinner("Reasoning and making a decision with LangGraph agent..."):
             agent_graph = build_decision_agent()