♻️ 移除子代理 to 参数，Agent 管理页面添加文档链接

src/app/repo/agent_task.test.ts

@@ -141,13 +141,21 @@ describe("AgentTaskRunRepo", () => {
 
   it("appendRun 超过 MAX_RUNS_PER_TASK 时裁剪最老记录", async () => {
     const taskId = "task-ring";
-    for (let i = 0; i < 105; i++) {
+    // 预填 500 条数据（最新在前），避免逐条 append 超时
+    const prefilled: AgentTaskRun[] = [];
+    for (let i = 499; i >= 0; i--) {
+      prefilled.push(makeRun({ id: `rr-${i}`, taskId, starttime: i }));
+    }
+    await (repo as any).writeJsonFile(`${taskId}.json`, prefilled);
+
+    // 再 append 5 条（id rr-500 ~ rr-504），触发裁剪
+    for (let i = 500; i < 505; i++) {
       await repo.appendRun(makeRun({ id: `rr-${i}`, taskId, starttime: i }));
     }
-    const runs = await repo.listRuns(taskId, 200);
-    expect(runs.length).toBe(100);
+    const runs = await repo.listRuns(taskId, 600);
+    expect(runs.length).toBe(500);
     // 最新的在前，最老 5 条被裁剪掉（rr-0 ~ rr-4）
-    expect(runs[0].id).toBe("rr-104");
-    expect(runs[99].id).toBe("rr-5");
+    expect(runs[0].id).toBe("rr-504");
+    expect(runs[499].id).toBe("rr-5");
   });
 });

src/app/repo/agent_task.ts

@@ -28,7 +28,7 @@ export class AgentTaskRepo extends Repo<AgentTask> {
   }
 }
 
-const MAX_RUNS_PER_TASK = 100;
+const MAX_RUNS_PER_TASK = 500;
 
 export class AgentTaskRunRepo extends OPFSRepo {
   constructor() {

src/app/service/agent/core/system_prompt.ts

@@ -136,7 +136,6 @@ The sub-agent starts fresh — it has zero context from this conversation. Brief
 - **Launch multiple agents concurrently** whenever possible — call \`agent\` multiple times **in the same response**.
 - Sub-agent results are not visible to the user. Summarize the results for the user after sub-agents complete.
 - Sub-agents share the parent's task list — they can call \`update_task\` to report progress.
-- To continue a previously completed sub-agent, use the \`to\` parameter with the agentId.
 
 ### When NOT to Use
 

src/app/service/agent/core/tools/sub_agent.test.ts

@@ -15,7 +15,6 @@ describe("sub_agent", () => {
       prompt: "Search for X",
       description: "Searching X",
       type: undefined,
-      to: undefined,
     });
     expect(result).toContain("[agentId: test-id]");
     expect(result).toContain("Sub-agent result");
@@ -30,20 +29,18 @@ describe("sub_agent", () => {
       prompt: "Do something",
       description: "Sub-agent task",
       type: undefined,
-      to: undefined,
     });
   });
 
-  it("should pass type and to parameters", async () => {
+  it("should pass type parameter", async () => {
     const mockRunSubAgent = vi.fn().mockResolvedValue({ agentId: "id3", result: "ok" });
     const { executor } = createSubAgentTool({ runSubAgent: mockRunSubAgent });
 
-    await executor.execute({ prompt: "Research X", type: "researcher", to: "prev-agent-id" });
+    await executor.execute({ prompt: "Research X", type: "researcher" });
     expect(mockRunSubAgent).toHaveBeenCalledWith({
       prompt: "Research X",
       description: "Sub-agent task",
       type: "researcher",
-      to: "prev-agent-id",
     });
   });
 

src/app/service/agent/core/tools/sub_agent.ts

@@ -8,7 +8,6 @@ export type SubAgentRunOptions = {
   prompt: string;
   description: string;
   type?: string;
-  to?: string; // 延续已有子代理
   tabId?: number; // 父代理传递的标签页上下文
 };
 
@@ -26,30 +25,24 @@ const SUB_AGENT_TYPE_NAMES = Object.keys(SUB_AGENT_TYPES);
 export const SUB_AGENT_DEFINITION: ToolDefinition = {
   name: "agent",
   description:
-    "Launch a sub-agent to handle a subtask autonomously. Sub-agents run in their own conversation context. Use the `type` parameter to select a specialized sub-agent, or use `to` to continue a previous sub-agent with follow-up instructions.",
+    "Launch a sub-agent to handle a subtask autonomously. Sub-agents run in their own conversation context. Use the `type` parameter to select a specialized sub-agent.",
   parameters: {
     type: "object",
     properties: {
       prompt: {
         type: "string",
-        description: "The task description or follow-up message for the sub-agent. Be specific about what you need.",
+        description: "The task description for the sub-agent. Be specific about what you need.",
       },
       description: {
         type: "string",
-        description:
-          "A short (3-5 word) description of what the sub-agent will do, shown in the UI. Optional when resuming a previous sub-agent via `to`.",
+        description: "A short (3-5 word) description of what the sub-agent will do, shown in the UI.",
       },
       type: {
         type: "string",
         enum: SUB_AGENT_TYPE_NAMES,
         description:
           "Sub-agent type. 'researcher' (web search/fetch, page reading — read-only, no DOM interaction), 'page_operator' (browser tab interaction, DOM manipulation, page automation), 'general' (all tools, default). Choose the most specific type for better results.",
       },
-      to: {
-        type: "string",
-        description:
-          "agentId of a previously completed sub-agent. Sends a follow-up message while preserving the sub-agent's full conversation context.",
-      },
       tab_id: {
         type: "number",
         description:
@@ -71,10 +64,9 @@ export function createSubAgentTool(params: {
       const prompt = requireString(args, "prompt");
       const description = (args.description as string) || "Sub-agent task";
       const type = args.type as string | undefined;
-      const to = args.to as string | undefined;
       const tabId = args.tab_id as number | undefined;
 
-      const result = await params.runSubAgent({ prompt, description, type, to, tabId });
+      const result = await params.runSubAgent({ prompt, description, type, tabId });
 
       // 返回结构化结果，附带子代理执行详情用于持久化
       const content = `[agentId: ${result.agentId}]\n\n${result.result}`;

src/app/service/agent/service_worker/chat_service.ts

@@ -522,7 +522,7 @@ export class ChatService {
       // Sub-agent
       const subAgentTool = createSubAgentTool({
         runSubAgent: (options: SubAgentRunOptions) => {
-          const agentId = options.to || uuidv4();
+          const agentId = uuidv4();
           const typeConfig = resolveSubAgentType(options.type);
           // 组合父信号和类型配置的超时信号
           const subSignal = AbortSignal.any([abortController.signal, AbortSignal.timeout(typeConfig.timeoutMs)]);