diff --git a/src/agentex/lib/core/services/adk/providers/litellm.py b/src/agentex/lib/core/services/adk/providers/litellm.py
index d016148a..1ff24343 100644
--- a/src/agentex/lib/core/services/adk/providers/litellm.py
+++ b/src/agentex/lib/core/services/adk/providers/litellm.py
@@ -241,6 +241,7 @@ async def chat_completion_stream_auto_send(
                     final_content = TextContent(
                         author="agent",
                         content=complete_message.choices[0].message.content or "",
+                        format="markdown",
                     )
                     await streaming_context.stream_update(
                         update=StreamTaskMessageFull(