diff --git a/backend/packages/harness/deerflow/tools/builtins/task_tool.py b/backend/packages/harness/deerflow/tools/builtins/task_tool.py
index 9f3f13b..55a41e3 100644
--- a/backend/packages/harness/deerflow/tools/builtins/task_tool.py
+++ b/backend/packages/harness/deerflow/tools/builtins/task_tool.py
@@ -86,6 +86,8 @@ async def task_tool(
         sandbox_state = runtime.state.get("sandbox")
         thread_data = runtime.state.get("thread_data")
         thread_id = runtime.context.get("thread_id") if runtime.context else None
+        if thread_id is None:
+            thread_id = runtime.config.get("configurable", {}).get("thread_id")
 
         # Try to get parent model from configurable
         metadata = runtime.config.get("metadata", {})