diff --git a/pkg/provider/tools/toolmgr.py b/pkg/provider/tools/toolmgr.py
index 3e412eaf..c7bd0018 100644
--- a/pkg/provider/tools/toolmgr.py
+++ b/pkg/provider/tools/toolmgr.py
@@ -118,10 +118,9 @@ class ToolManager:
             traceback.print_exc()
             return f"error occurred when executing function {name}: {e}"
         finally:
-
             plugin = None
 
-            for p in self.ap.plugin_mgr.plugins:
+            for p in self.ap.plugin_mgr.plugins():
                 if function in p.content_functions:
                     plugin = p
                     break
@@ -137,4 +136,4 @@ class ToolManager:
                     },
                     function_name=function.name,
                     function_description=function.description,
-                )
+                )
\ No newline at end of file