diff --git a/tools/send_message_tool.py b/tools/send_message_tool.py
index b4de998fe5..938cb977b6 100644
--- a/tools/send_message_tool.py
+++ b/tools/send_message_tool.py
@@ -10,9 +10,10 @@ import json
 import logging
 import os
 import re
-from typing import Dict, Optional
 import ssl
 import time
+from email.utils import formatdate
+from typing import Dict, Optional
 
 from agent.redact import redact_sensitive_text