diff --git a/src/daemon/spawner.py b/src/daemon/spawner.py
index 00db6ac..23c1c53 100644
--- a/src/daemon/spawner.py
+++ b/src/daemon/spawner.py
@@ -988,8 +988,7 @@ curl -X POST http://{api_host}:{api_port}/api/projects/{project_id}/tasks/{task_
                 message=message,
                 task_id=task_id,
                 on_complete=on_complete,
-                use_main_session=(session_id is None),
-                reuse_session_id=session_id if session_id else None,
+                use_main_session=True,  # #02: 续杯走 main session
                 task_db_path=db_path,
             )
         except AgentBusyError: