Update streamlit_app.py

streamlit_app.py

@@ -21,8 +21,11 @@ try:
     from phi.tools.duckduckgo import DuckDuckGo
     HAS_PHI = True
 except Exception:
-    Agent = Gemini = DuckDuckGo = None
+# disable phi Agent usage to avoid phi IndexError in production
     HAS_PHI = False
+    Agent = None
+    Gemini = None
+    DuckDuckGo = None
 
 try:
     import google.generativeai as genai