diff --git a/finbot/agents/chat.py b/finbot/agents/chat.py
index ba2a0bd7..ff70f468 100644
--- a/finbot/agents/chat.py
+++ b/finbot/agents/chat.py
@@ -332,10 +332,11 @@ async def stream_response(
             stream = await self._client.responses.create(**stream_params)
 
             pending_tool_calls: list[dict] = []
+            round_text = ""
 
             async for event in stream:
                 if event.type == "response.output_text.delta":
-                    full_response += event.delta
+                    round_text += event.delta
                     yield f"data: {json.dumps({'type': 'token', 'content': event.delta})}\n\n"
 
                 elif event.type == "response.output_item.done":