diff --git a/app/sdk/_legacy/site.py b/app/sdk/_legacy/site.py
index 3f468ccc4..a0cbb83e6 100644
--- a/app/sdk/_legacy/site.py
+++ b/app/sdk/_legacy/site.py
@@ -1,10 +1,33 @@
 """保留旧站点 Oper 导入路径和无 Session 插件调用形态。"""
 
+import inspect
+from typing import Optional
+
 from app.db.oper.site import SiteOper as CanonicalSiteOper
 
 
 class SiteOper(CanonicalSiteOper):
     """继承表级站点 Oper，并将旧插件入口隔离在 Legacy SDK。"""
 
+    def success(self, domain: str, seconds: Optional[int] = None) -> None:
+        """转发站点成功统计，并保留旧插件可见的调用签名。"""
+        super().success(domain, seconds)
+
+    def fail(self, domain: str) -> None:
+        """转发站点失败统计，并保留旧插件可见的调用签名。"""
+        super().fail(domain)
+
+
+# 旧插件通过 inspect.signature 校验这两个入口没有显式返回注解；转发方法
+# 保持类型检查所需的完整返回合同，再把仅用于反射的签名恢复为历史形态。
+_legacy_success_signature = inspect.signature(CanonicalSiteOper.success).replace(
+    return_annotation=inspect.Signature.empty,
+)
+_legacy_fail_signature = inspect.signature(CanonicalSiteOper.fail).replace(
+    return_annotation=inspect.Signature.empty,
+)
+setattr(SiteOper.success, "__signature__", _legacy_success_signature)
+setattr(SiteOper.fail, "__signature__", _legacy_fail_signature)
+
 
 __all__ = ["SiteOper"]