diff --git a/metagpt/config.py b/metagpt/config.py
index 4cae79b17..5944fef57 100644
--- a/metagpt/config.py
+++ b/metagpt/config.py
@@ -131,6 +131,8 @@ class Config(metaclass=Singleton):
 
     def set_context(self, options: dict):
         """Update current config"""
+        if not options:
+            return
         opts = deepcopy(OPTIONS.get())
         opts.update(options)
         OPTIONS.set(opts)
diff --git a/metagpt/memory/memory.py b/metagpt/memory/memory.py
index a96aaf1be..bf9f0541c 100644
--- a/metagpt/memory/memory.py
+++ b/metagpt/memory/memory.py
@@ -85,3 +85,11 @@ class Memory:
                 continue
             rsp += self.index[action]
         return rsp
+
+    def get_by_tags(self, tags: list) -> list[Message]:
+        """Return messages with specified tags"""
+        result = []
+        for m in self.storage:
+            if m.is_contain_tags(tags):
+                result.append(m)
+        return result
diff --git a/metagpt/roles/role.py b/metagpt/roles/role.py
index efb8db9f8..aba7d4574 100644
--- a/metagpt/roles/role.py
+++ b/metagpt/roles/role.py
@@ -92,6 +92,13 @@ class RoleContext(BaseModel):
     def history(self) -> list[Message]:
         return self.memory.get()
 
+    @property
+    def prerequisite(self):
+        """Retrieve information with `prerequisite` tag"""
+        if self.memory and hasattr(self.memory, 'get_by_tags'):
+            return self.memory.get_by_tags([MessageTag.Prerequisite.value])
+        return ""
+
 
 class Role:
     """Role/Proxy"""
@@ -201,7 +208,7 @@ class Role:
         #                                history=self.history)
 
         logger.info(f"{self._setting}: ready to {self._rc.todo}")
-        requirement = self._rc.important_memory
+        requirement = self._rc.important_memory or self._rc.prerequisite
         response = await self._rc.todo.run(requirement)
         # logger.info(response)
         if isinstance(response, ActionOutput):