diff --git a/src/backend/v3/callbacks/response_handlers.py b/src/backend/v3/callbacks/response_handlers.py
index fb91dd9c0..51a4e2e84 100644
--- a/src/backend/v3/callbacks/response_handlers.py
+++ b/src/backend/v3/callbacks/response_handlers.py
@@ -6,7 +6,7 @@
 import asyncio
 import logging
 import time
-
+import re
 from semantic_kernel.contents import ChatMessageContent, StreamingChatMessageContent
 from v3.config.settings import connection_config
 from v3.models.messages import (
@@ -18,6 +18,24 @@
 )
 
 
+def clean_citations(text: str) -> str:
+    """Remove citation markers from agent responses while preserving formatting."""
+    if not text:
+        return text
+
+    # Remove citation patterns like [9:0|source], [9:1|source], etc.
+    text = re.sub(r'\[\d+:\d+\|source\]', '', text)
+
+    # Remove other common citation pattern
+    text = re.sub(r'\[\s*source\s*\]', '', text, flags=re.IGNORECASE)
+    text = re.sub(r'\[\d+\]', '', text)
+    text = re.sub(r'【[^】]*】', '', text)  # Unicode brackets
+    text = re.sub(r'\(source:[^)]*\)', '', text, flags=re.IGNORECASE)
+    text = re.sub(r'\[source:[^\]]*\]', '', text, flags=re.IGNORECASE)
+
+    return text
+
+
 def agent_response_callback(message: ChatMessageContent, user_id: str = None) -> None:
     """Observer function to print detailed information about streaming messages."""
     # import sys
@@ -55,7 +73,7 @@ def agent_response_callback(message: ChatMessageContent, user_id: str = None) ->
                 final_message = AgentMessage(
                     agent_name=agent_name,
                     timestamp=time.time() or "",
-                    content=message.content or "",
+                    content=clean_citations(message.content) or "",
                 )
 
                 asyncio.create_task(
@@ -80,7 +98,7 @@ async def streaming_agent_response_callback(
             try:
                 message = AgentMessageStreaming(
                     agent_name=streaming_message.name or "Unknown Agent",
-                    content=streaming_message.content,
+                    content=clean_citations(streaming_message.content),
                     is_final=is_final,
                 )
                 await connection_config.send_status_update_async(