fix agent tools

app/agent/tools/impl/query_downloaders.py

@@ -1,6 +1,9 @@
 """查询下载器工具"""
 
 import json
+from typing import Type
+
+from pydantic import BaseModel, Field
 
 from app.db.systemconfig_oper import SystemConfigOper
 from app.log import logger
@@ -8,11 +11,17 @@ from app.schemas.types import SystemConfigKey
 from app.agent.tools.base import MoviePilotTool
 
 
+class QueryDownloadersInput(BaseModel):
+    """查询下载器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")
+
+
 class QueryDownloadersTool(MoviePilotTool):
     name: str = "query_downloaders"
-    description: str = "查询下载器配置，查看可用的下载器列表和配置信息。"
+    description: str = "Query downloader configuration and list all available downloaders. Shows downloader status, connection details, and configuration settings."
+    args_schema: Type[BaseModel] = QueryDownloadersInput
 
-    async def _arun(self, explanation: str, **kwargs) -> str:
+    async def _arun(self, **kwargs) -> str:
         logger.info(f"执行工具: {self.name}")
         try:
             system_config_oper = SystemConfigOper()