diff --git a/app/agent/tools/__init__.py b/app/agent/tools/__init__.py
index 72727378..12be8988 100644
--- a/app/agent/tools/__init__.py
+++ b/app/agent/tools/__init__.py
@@ -16,6 +16,7 @@ from app.agent.tools.impl.query_media_library import QueryMediaLibraryTool
 from app.agent.tools.impl.send_message import SendMessageTool
 from app.agent.tools.impl.query_schedulers import QuerySchedulersTool
 from app.agent.tools.impl.run_scheduler import RunSchedulerTool
+from app.agent.tools.impl.update_site_cookie import UpdateSiteCookieTool
 from .factory import MoviePilotToolFactory
 
 __all__ = [
@@ -30,6 +31,7 @@ __all__ = [
     "QueryDownloadersTool",
     "QuerySitesTool",
     "TestSiteTool",
+    "UpdateSiteCookieTool",
     "GetRecommendationsTool",
     "QueryMediaLibraryTool",
     "SendMessageTool",
diff --git a/app/agent/tools/factory.py b/app/agent/tools/factory.py
index c7156e4a..836754b9 100644
--- a/app/agent/tools/factory.py
+++ b/app/agent/tools/factory.py
@@ -17,6 +17,7 @@ from app.agent.tools.impl.search_torrents import SearchTorrentsTool
 from app.agent.tools.impl.send_message import SendMessageTool
 from app.agent.tools.impl.query_schedulers import QuerySchedulersTool
 from app.agent.tools.impl.run_scheduler import RunSchedulerTool
+from app.agent.tools.impl.update_site_cookie import UpdateSiteCookieTool
 from app.core.plugin import PluginManager
 from app.log import logger
 from .base import MoviePilotTool
@@ -42,6 +43,7 @@ class MoviePilotToolFactory:
             QueryDownloadersTool,
             QuerySitesTool,
             TestSiteTool,
+            UpdateSiteCookieTool,
             GetRecommendationsTool,
             QueryMediaLibraryTool,
             SendMessageTool,
diff --git a/app/agent/tools/impl/update_site_cookie.py b/app/agent/tools/impl/update_site_cookie.py
new file mode 100644
index 00000000..59e6f1ed
--- /dev/null
+++ b/app/agent/tools/impl/update_site_cookie.py
@@ -0,0 +1,76 @@
+"""更新站点Cookie和UA工具"""
+
+from typing import Optional, Type
+
+from pydantic import BaseModel, Field
+
+from app.agent.tools.base import MoviePilotTool
+from app.chain.site import SiteChain
+from app.db.site_oper import SiteOper
+from app.log import logger
+from app.utils.string import StringUtils
+
+
+class UpdateSiteCookieInput(BaseModel):
+    """更新站点Cookie和UA工具的输入参数模型"""
+    explanation: str = Field(..., description="Clear explanation of why this tool is being used in the current context")
+    site_identifier: str = Field(..., description="Site identifier: can be site ID (integer as string), site name, or site domain/URL")
+    username: str = Field(..., description="Site login username")
+    password: str = Field(..., description="Site login password")
+    two_step_code: Optional[str] = Field(None, description="Two-step verification code or secret key (optional, required for sites with 2FA enabled)")
+
+
+class UpdateSiteCookieTool(MoviePilotTool):
+    name: str = "update_site_cookie"
+    description: str = "Update site Cookie and User-Agent by logging in with username and password. This tool can automatically obtain and update the site's authentication credentials. Supports two-step verification for sites that require it. Accepts site ID, site name, or site domain/URL as identifier."
+    args_schema: Type[BaseModel] = UpdateSiteCookieInput
+
+    async def run(self, site_identifier: str, username: str, password: str, 
+                  two_step_code: Optional[str] = None, **kwargs) -> str:
+        logger.info(f"执行工具: {self.name}, 参数: site_identifier={site_identifier}, username={username}")
+
+        try:
+            site_oper = SiteOper()
+            site_chain = SiteChain()
+            
+            # 尝试解析为站点ID
+            site = None
+            if site_identifier.isdigit():
+                # 如果是数字，尝试作为站点ID查询
+                site = await site_oper.async_get(int(site_identifier))
+            
+            # 如果不是ID或ID查询失败，尝试按名称或域名查询
+            if not site:
+                # 尝试按名称查询
+                sites = await site_oper.async_list()
+                for s in sites:
+                    if (site_identifier.lower() in (s.name or "").lower()) or \
+                       (site_identifier.lower() in (s.domain or "").lower()):
+                        site = s
+                        break
+                
+                # 如果还是没找到，尝试从URL提取域名
+                if not site:
+                    domain = StringUtils.get_url_domain(site_identifier)
+                    if domain:
+                        site = await site_oper.async_get_by_domain(domain)
+            
+            if not site:
+                return f"未找到站点：{site_identifier}，请使用 query_sites 工具查询可用的站点"
+            
+            # 更新站点Cookie和UA
+            status, message = site_chain.update_cookie(
+                site_info=site,
+                username=username,
+                password=password,
+                two_step_code=two_step_code
+            )
+            
+            if status:
+                return f"站点【{site.name}】Cookie和UA更新成功\n{message}"
+            else:
+                return f"站点【{site.name}】Cookie和UA更新失败\n错误原因：{message}"
+        except Exception as e:
+            logger.error(f"更新站点Cookie和UA失败: {e}", exc_info=True)
+            return f"更新站点Cookie和UA时发生错误: {str(e)}"
+
diff --git a/app/db/site_oper.py b/app/db/site_oper.py
index 572ccc2a..c215a471 100644
--- a/app/db/site_oper.py
+++ b/app/db/site_oper.py
@@ -29,6 +29,12 @@ class SiteOper(DbOper):
         """
         return Site.get(self._db, sid)
 
+    async def async_get(self, sid: int) -> Site:
+        """
+        异步查询单个站点
+        """
+        return await Site.async_get(self._db, sid)
+
     def list(self) -> List[Site]:
         """
         获取站点列表