feat: 新增修改下载任务Agent工具，查询下载任务支持返回标签

- 新增 modify_download Agent工具，支持通过hash修改下载任务的标签、开始和暂停下载
- 在 ChainBase 及三个下载器模块中新增 set_torrents_tag 方法
- DownloadingTorrent schema 新增 tags 字段
- 各下载器模块构建 DownloadingTorrent 时填充 tags
- query_download_tasks 工具输出中新增 tags 字段

app/agent/tools/impl/modify_download.py

@@ -0,0 +1,123 @@
+"""修改下载任务工具"""
+
+from typing import Optional, Type, List
+
+from pydantic import BaseModel, Field
+
+from app.agent.tools.base import MoviePilotTool
+from app.chain.download import DownloadChain
+from app.log import logger
+
+
+class ModifyDownloadInput(BaseModel):
+    """修改下载任务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",
+    )
+    hash: str = Field(
+        ..., description="Task hash (can be obtained from query_download_tasks tool)"
+    )
+    action: Optional[str] = Field(
+        None,
+        description="Action to perform on the task: 'start' to resume downloading, 'stop' to pause downloading. "
+        "If not provided, no start/stop action will be performed.",
+    )
+    tags: Optional[List[str]] = Field(
+        None,
+        description="List of tags to set on the download task. If provided, these tags will be added to the task. "
+        "Example: ['movie', 'hd']",
+    )
+    downloader: Optional[str] = Field(
+        None,
+        description="Name of specific downloader (optional, if not provided will search all downloaders)",
+    )
+
+
+class ModifyDownloadTool(MoviePilotTool):
+    """修改下载任务工具"""
+
+    name: str = "modify_download"
+    description: str = (
+        "Modify a download task in the downloader by task hash. "
+        "Supports: 1) Setting tags on a download task, "
+        "2) Starting (resuming) a paused download task, "
+        "3) Stopping (pausing) a downloading task. "
+        "Multiple operations can be performed in a single call."
+    )
+    args_schema: Type[BaseModel] = ModifyDownloadInput
+
+    def get_tool_message(self, **kwargs) -> Optional[str]:
+        hash_value = kwargs.get("hash", "")
+        action = kwargs.get("action")
+        tags = kwargs.get("tags")
+        downloader = kwargs.get("downloader")
+
+        parts = [f"正在修改下载任务: {hash_value}"]
+        if action == "start":
+            parts.append("操作: 开始下载")
+        elif action == "stop":
+            parts.append("操作: 暂停下载")
+        if tags:
+            parts.append(f"标签: {', '.join(tags)}")
+        if downloader:
+            parts.append(f"下载器: {downloader}")
+        return " | ".join(parts)
+
+    async def run(
+        self,
+        hash: str,
+        action: Optional[str] = None,
+        tags: Optional[List[str]] = None,
+        downloader: Optional[str] = None,
+        **kwargs,
+    ) -> str:
+        logger.info(
+            f"执行工具: {self.name}, 参数: hash={hash}, action={action}, tags={tags}, downloader={downloader}"
+        )
+
+        try:
+            # 校验 hash 格式
+            if len(hash) != 40 or not all(c in "0123456789abcdefABCDEF" for c in hash):
+                return "参数错误：hash 格式无效，请先使用 query_download_tasks 工具获取正确的 hash。"
+
+            # 校验参数：至少需要一个操作
+            if not action and not tags:
+                return "参数错误：至少需要指定 action（start/stop）或 tags 中的一个。"
+
+            # 校验 action 参数
+            if action and action not in ("start", "stop"):
+                return f"参数错误：action 只支持 'start'（开始下载）或 'stop'（暂停下载），收到: '{action}'。"
+
+            download_chain = DownloadChain()
+            results = []
+
+            # 设置标签
+            if tags:
+                tag_result = download_chain.set_torrents_tag(
+                    hashs=[hash], tags=tags, downloader=downloader
+                )
+                if tag_result:
+                    results.append(f"成功设置标签：{', '.join(tags)}")
+                else:
+                    results.append(f"设置标签失败，请检查任务是否存在或下载器是否可用")
+
+            # 执行开始/暂停操作
+            if action:
+                action_result = download_chain.set_downloading(
+                    hash_str=hash, oper=action, name=downloader
+                )
+                action_desc = "开始" if action == "start" else "暂停"
+                if action_result:
+                    results.append(f"成功{action_desc}下载任务")
+                else:
+                    results.append(
+                        f"{action_desc}下载任务失败，请检查任务是否存在或下载器是否可用"
+                    )
+
+            return f"下载任务 {hash}：" + "；".join(results)
+
+        except Exception as e:
+            logger.error(f"修改下载任务失败: {e}", exc_info=True)
+            return f"修改下载任务时发生错误: {str(e)}"

app/agent/tools/impl/query_download_tasks.py

@@ -214,6 +214,7 @@ class QueryDownloadTasksTool(MoviePilotTool):
                         "state": d.state,
                         "upspeed": d.upspeed,
                         "dlspeed": d.dlspeed,
+                        "tags": d.tags,
                         "left_time": d.left_time
                     }
                     # 精简 media 字段