diff --git a/lib/agents/login_google/prompt.py b/lib/agents/login_google/prompt.py
index a5be07e..a57e1f4 100644
--- a/lib/agents/login_google/prompt.py
+++ b/lib/agents/login_google/prompt.py
@@ -44,6 +44,9 @@ Constraints:
     - CAPTCHA or MFA appears
     - ID/password input is required
 - If the user is already logged in to Google and redirected back automatically, stop there and report success.
+- If the login page cannot be found, return "login_page_not_found".
+- If the Google login button is not found, return "sso_not_found".
+- If a page such as a sign-up page appears after entering the ID and password, consider it a successful login and terminate immediately.
 
 Final Output:
 Return the result in the following format only: