diff --git a/metagpt/memory/memory.py b/metagpt/memory/memory.py
index 9d526420f..2f4c9d20b 100644
--- a/metagpt/memory/memory.py
+++ b/metagpt/memory/memory.py
@@ -10,7 +10,6 @@ from collections import defaultdict
 from typing import Iterable, Set
 
 from metagpt.schema import Message
-from metagpt.utils.common import any_to_str, any_to_str_set
 
 
 class Memory:
@@ -76,14 +75,12 @@ class Memory:
 
     def get_by_action(self, action) -> list[Message]:
         """Return all messages triggered by a specified Action"""
-        idx = any_to_str(action)
-        return self.index[idx]
+        return self.index[action]
 
     def get_by_actions(self, actions: Set) -> list[Message]:
         """Return all messages triggered by specified Actions"""
-        idxs = any_to_str_set(actions)
         rsp = []
-        for action in idxs:
+        for action in actions:
             if action not in self.index:
                 continue
             rsp += self.index[action]