Update app.py

app.py

@@ -168,7 +168,7 @@ def run_agent_chat(user_input: str, history: list):
             url = user_input.split()[0] if user_input.startswith("http") else next((w for w in user_input.split() if w.startswith("http")), "")
             request = user_input.replace(url, "").strip() or "Navigate to the URL and describe the page."
         else:
-            url = "[invalid url, do not cite]
+            url = "[invalid url, do not cite]"
             request = user_input
 
         search_request = f"Please go to {url}. {request}"