diff --git a/openhands/server/conversation_manager/conversation_manager.py b/openhands/server/conversation_manager/conversation_manager.py
index f8d1843d3f..330bcc14c8 100644
--- a/openhands/server/conversation_manager/conversation_manager.py
+++ b/openhands/server/conversation_manager/conversation_manager.py
@@ -107,6 +107,10 @@ class ConversationManager(ABC):
     async def send_to_event_stream(self, connection_id: str, data: dict):
         """Send data to an event stream."""
 
+    @abstractmethod
+    async def send_event_to_conversation(self, sid: str, data: dict):
+        """Send an event to a conversation."""
+
     @abstractmethod
     async def disconnect_from_session(self, connection_id: str):
         """Disconnect from a session."""
diff --git a/openhands/server/conversation_manager/docker_nested_conversation_manager.py b/openhands/server/conversation_manager/docker_nested_conversation_manager.py
index 22fb55ca47..e7dbdb6f6e 100644
--- a/openhands/server/conversation_manager/docker_nested_conversation_manager.py
+++ b/openhands/server/conversation_manager/docker_nested_conversation_manager.py
@@ -275,6 +275,18 @@ class DockerNestedConversationManager(ConversationManager):
         # Not supported - clients should connect directly to the nested server!
         raise ValueError('unsupported_operation')
 
+    async def send_event_to_conversation(self, sid, data):
+        async with httpx.AsyncClient(
+            headers={
+                'X-Session-API-Key': self._get_session_api_key_for_conversation(sid)
+            }
+        ) as client:
+            nested_url = self._get_nested_url(sid)
+            response = await client.post(
+                f'{nested_url}/api/conversations/{sid}/events', json=data
+            )
+            response.raise_for_status()
+
     async def disconnect_from_session(self, connection_id: str):
         # Not supported - clients should connect directly to the nested server!
         raise ValueError('unsupported_operation')
diff --git a/openhands/server/conversation_manager/standalone_conversation_manager.py b/openhands/server/conversation_manager/standalone_conversation_manager.py
index 9a372ad080..6b3c880add 100644
--- a/openhands/server/conversation_manager/standalone_conversation_manager.py
+++ b/openhands/server/conversation_manager/standalone_conversation_manager.py
@@ -331,13 +331,13 @@ class StandaloneConversationManager(ConversationManager):
         sid = self._local_connection_id_to_session_id.get(connection_id)
         if not sid:
             raise RuntimeError(f'no_connected_session:{connection_id}')
+        await self.send_event_to_conversation(sid, data)
 
+    async def send_event_to_conversation(self, sid: str, data: dict):
         session = self._local_agent_loops_by_sid.get(sid)
-        if session:
-            await session.dispatch(data)
-            return
-
-        raise RuntimeError(f'no_connected_session:{connection_id}:{sid}')
+        if not session:
+            raise RuntimeError(f'no_conversation:{sid}')
+        await session.dispatch(data)
 
     async def disconnect_from_session(self, connection_id: str):
         sid = self._local_connection_id_to_session_id.pop(connection_id, None)