diff --git a/backend/packages/harness/deerflow/sandbox/tools.py b/backend/packages/harness/deerflow/sandbox/tools.py
index 81ddc1018..ce91e8634 100644
--- a/backend/packages/harness/deerflow/sandbox/tools.py
+++ b/backend/packages/harness/deerflow/sandbox/tools.py
@@ -678,6 +678,8 @@ def ensure_sandbox_initialized(runtime: ToolRuntime[ContextT, ThreadState] | Non
 
     # Lazy acquisition: get thread_id and acquire sandbox
     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") if runtime.config else None
     if thread_id is None:
         raise SandboxRuntimeError("Thread ID not available in runtime context")