feat(agent): add read-only download.list capability

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/contracts/src/capability.ts

@@ -69,6 +69,7 @@ export const CAPABILITY_IDS = [
   "subscription.list",
   "decision.list",
   "download.inspect",
+  "download.list",
   "downloader.list",
   "agent.spawn",
   "agent.await",
@@ -330,6 +331,18 @@ export const CAPABILITY_CATALOG: Record<KnownCapabilityId, CapabilityDescriptor>
     true,
     false,
   ),
+  // AG-5:先列再看。反例里模型要用户给下载任务 ID / 种子 hash,其实自己能列
+  "download.list": d(
+    "download.list",
+    "列出下载任务",
+    "按状态、作品或名称列出下载任务（名称、作品、状态、进度、体积、下载器、最近进展与错误），附按状态计数；缺省只列本工具管理的。问下载进度、找失败或卡住的下载、要下载任务 ID 时先用它，再用 download.inspect 看其中一个；不要向用户要 ID 或 hash",
+    "read",
+    "DownloadList",
+    "read",
+    "low",
+    true,
+    false,
+  ),
   // FIX-7:智能体原先只能从站点列表推断下载器是否接入(site.list 不含下载器),汇报成"下载器不在系统内"
   "downloader.list": d(
     "downloader.list",
@@ -627,6 +640,7 @@ export const CAPABILITY_ACTIVITY: Record<KnownCapabilityId, CapabilityActivity>
   "subscription.list": act("查", "订阅"),
   "decision.list": act("查", "待处理事项"),
   "download.inspect": act("查", "下载任务", "个"),
+  "download.list": act("列", "下载任务"),
   "downloader.list": act("查", "下载器"),
   "agent.spawn": act("派出", "子会话", "个"),
   "agent.await": act("等", "子会话"),