diff --git a/metagpt/context_mixin.py b/metagpt/context_mixin.py
index cf0604606..59daa692f 100644
--- a/metagpt/context_mixin.py
+++ b/metagpt/context_mixin.py
@@ -34,14 +34,15 @@ class ContextMixin(BaseModel):
 
     @model_validator(mode="after")
     def validate_context_mixin_extra(self):
-        self._process_context_mixin_extra(**(self.model_extra or {}))
+        self._process_context_mixin_extra()
         return self
 
-    def _process_context_mixin_extra(self, **kwargs):
+    def _process_context_mixin_extra(self):
         """Process the extra field"""
-        self.set_context(kwargs.get("context"))
-        self.set_config(kwargs.get("config"))
-        self.set_llm(kwargs.get("llm"))
+        kwargs = self.model_extra or {}
+        self.set_context(kwargs.pop("context", None))
+        self.set_config(kwargs.pop("config", None))
+        self.set_llm(kwargs.pop("llm", None))
 
     def set(self, k, v, override=False):
         """Set attribute"""
diff --git a/metagpt/roles/role.py b/metagpt/roles/role.py
index 20cd4da99..c098f95af 100644
--- a/metagpt/roles/role.py
+++ b/metagpt/roles/role.py
@@ -151,18 +151,19 @@ class Role(SerializationMixin, ContextMixin, BaseModel):
 
     @model_validator(mode="after")
     def validate_role_extra(self):
-        self._process_role_extra(**(self.model_extra or {}))
+        self._process_role_extra()
         return self
 
-    def _process_role_extra(self, **kwargs):
+    def _process_role_extra(self):
         self.pydantic_rebuild_model()
+        kwargs = self.model_extra or {}
 
         if self.is_human:
             self.llm = HumanProvider(None)
 
         self._check_actions()
         self.llm.system_prompt = self._get_prefix()
-        self._watch(kwargs.get("watch") or [UserRequirement])
+        self._watch(kwargs.pop("watch", [UserRequirement]))
 
         if self.latest_observed_msg:
             self.recovered = True