diff --git a/bioflow_service/app/services/bioflow/extensions.py b/bioflow_service/app/services/bioflow/extensions.py
index 0e3c143..b6b9ede 100644
--- a/bioflow_service/app/services/bioflow/extensions.py
+++ b/bioflow_service/app/services/bioflow/extensions.py
@@ -804,7 +804,9 @@ class ExtensionStore:
 
         executor = self.executor or ExtensionExecutor()
         started = now_iso()
-        if isinstance(executor, ExtensionExecutor) and type(executor) is ExtensionExecutor:
+        if isinstance(executor, ExtensionExecutor) and executor._real is None:
+            # 与 trial 守卫同语义:适配器实例(ExtensionExecutor)在未注入真实执行器时
+            # 才拒绝;TL 接线后的适配器 _real 非 None,正常执行。
             raise ExtensionRunError(
                 "扩展执行器未接入（extension_exec.py 由 Dev-B 实现；"
                 "接口签名见 extensions.ExtensionExecutor）"