diff --git a/backend/app/services/langgraph/streaming_agent.py b/backend/app/services/langgraph/streaming_agent.py
index 2d8d31c..7037404 100644
--- a/backend/app/services/langgraph/streaming_agent.py
+++ b/backend/app/services/langgraph/streaming_agent.py
@@ -3,6 +3,7 @@
 import json
 import re
 import time
+from collections import Counter
 from functools import lru_cache
 from typing import Any, cast