diff --git a/nonebot_bison/sub_manager/add_cookie.py b/nonebot_bison/sub_manager/add_cookie.py
index 235c65b..505a32a 100644
--- a/nonebot_bison/sub_manager/add_cookie.py
+++ b/nonebot_bison/sub_manager/add_cookie.py
@@ -7,7 +7,7 @@ from nonebot.adapters import Message, MessageTemplate
 
 from ..platform import platform_manager
 from .utils import common_platform, gen_handle_cancel
-from ..utils.site import CookieClientManager, is_cookie_client_manager
+from ..utils.site import CookieSite, CookieClientManager, is_cookie_client_manager
 
 
 def do_add_cookie(add_cookie: type[Matcher]):
@@ -52,11 +52,9 @@ def do_add_cookie(add_cookie: type[Matcher]):
 
     @add_cookie.got("cookie", MessageTemplate("{_prompt}"), [handle_cancel])
     async def got_cookie(state: T_State, cookie: Message = Arg()):
-        client_mgr: type[CookieClientManager] = cast(
-            type[CookieClientManager], platform_manager[state["platform"]].site.client_mgr
-        )
+        cookie_site = cast(type[CookieSite], platform_manager[state["platform"]].site)
         cookie_text = cookie.extract_plain_text()
-        if not await client_mgr.validate_cookie(cookie_text):
+        if not await cookie_site.validate_cookie(cookie_text):
             await add_cookie.reject(state["site"].cookie_format_prompt)
         state["cookie"] = cookie_text
 
diff --git a/nonebot_bison/utils/site.py b/nonebot_bison/utils/site.py
index 86a1a52..69dfc7e 100644
--- a/nonebot_bison/utils/site.py
+++ b/nonebot_bison/utils/site.py
@@ -65,25 +65,13 @@ class CookieClientManager(ClientManager):
         from ..platform import site_manager
 
         cookie_site = cast(type[CookieSite], site_manager[cls._site_name])
-        if not await cls.validate_cookie(content):
+        if not await cookie_site.validate_cookie(content):
             raise ValueError()
         cookie = Cookie(site_name=cls._site_name, content=content)
         cookie.cookie_name = await cookie_site.get_cookie_name(content)
         cookie.cd = cls._default_cd
         await config.add_cookie(cookie)
 
-    @classmethod
-    async def validate_cookie(cls, content: str) -> bool:
-        """验证 cookie 内容是否有效，添加 cookie 时用，可根据平台的具体情况进行重写"""
-        # todo: 考虑移动到 cookie site 中
-        try:
-            data = json.loads(content)
-            if not isinstance(data, dict):
-                return False
-        except JSONDecodeError:
-            return False
-        return True
-
     def _generate_hook(self, cookie: Cookie) -> callable:
         """hook 函数生成器，用于回写请求状态到数据库"""
 
@@ -172,6 +160,17 @@ class CookieSite(Site):
 
         return text_fletten(f"{cls.name} [{content[:10]}]")
 
+    @classmethod
+    async def validate_cookie(cls, content: str) -> bool:
+        """验证 cookie 内容是否有效，添加 cookie 时用，可根据平台的具体情况进行重写"""
+        try:
+            data = json.loads(content)
+            if not isinstance(data, dict):
+                return False
+        except JSONDecodeError:
+            return False
+        return True
+
 
 def anonymous_site(schedule_type: Literal["date", "interval", "cron"], schedule_setting: dict) -> type[Site]:
     return type(