diff --git a/config/config.yaml b/config/config.yaml
index 696c39cb..7d98f49d 100644
--- a/config/config.yaml
+++ b/config/config.yaml
@@ -13,8 +13,9 @@ memory_service:
     class: memory.service.chat_memory_service
     history_msg_count: 32
     contextual_msg_count: 6
+    read_memory_key: read_memory
     memory_operations:
-      read_user_message:
+      contextual_message:
         class: memory.operation.read_memory
         workflow: dummy
         description: "read session messages of the user"
diff --git a/memory_scope/memory/worker/base_worker.py b/memory_scope/memory/worker/base_worker.py
index 9f9ed979..85426cc3 100644
--- a/memory_scope/memory/worker/base_worker.py
+++ b/memory_scope/memory/worker/base_worker.py
@@ -52,5 +52,5 @@ class BaseWorker(metaclass=ABCMeta):
         else:
             self.context[key] = value
 
-    def __getattr__(self, key):
+    def __getattr__(self, key: str):
         return self.kwargs[key]