feat(agent): agent.spawn{await:true} suspends too; children wake the parent via fact

agent.await and agent.spawn{await:true} now return immediately when
children are still running: the session closes, runAgent registers a
wake signal in agent_run.await_wake and waits with waitForFact without
holding an io/agent worker slot. A child that settles (terminal or
waiting) signals the parent's registered fact, so the parent resumes at
once instead of polling; the suspended call replays and the child
report becomes the tool result. agent.spawn is registered replay-safe;
a suspended spawn is recorded as failed in the ledger so the replay
re-runs it against the same child.

Migration 0037 also adds the admin_recovery_code, admin_passkey and
webauthn_challenge tables used by the account work.

E11 asserts the parent is suspended with no run held by any worker
while it waits, and covers spawn{await:true} end to end.

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

apps/server/src/modules/agent/runner.ts

@@ -27,7 +27,7 @@ import { type RunUpstream, resolveRunUpstream } from "../pi/index.ts";
 import type { ServerContext } from "../types.ts";
 import { DEMO_SCRIPTS, parseFakeScripts } from "./fake-scripts.ts";
 import { buildGoalReport } from "./report.ts";
-import { type AwaitSuspension, attachLiveRun, type LiveRun, subagentSettings } from "./subagents.ts";
+import { type AwaitSuspension, attachLiveRun, type LiveRun, subagentSettings, wakeParent } from "./subagents.ts";
 
 // runAgent 任务的执行体:从设置装配 Pi(或 fake)运行时 → 事件先写 agent_run_event 再推 SSE →
 // 崩溃恢复(pendingOperations>0 时先按幂等键对账未知结果再 resume)→ 消费追加消息 → 汇报以业务表为准。
@@ -502,11 +502,14 @@ export async function drive(
 export async function goalSettled(env: AgentEnv, runId: string, modelText: string): Promise<AgentGoalReport | null> {
   const r = await buildGoalReport(env.ctx.db, runId, modelText);
   if (r.state !== "waiting") return r;
-  await env.ctx.db
+  const u = await env.ctx.db
     .updateTable("agent_run")
     .set({ status: "waiting", summary: r.summary })
     .where("id", "=", runId)
     .where("status", "in", ["running", "waiting"])
-    .execute();
+    .returning(["parent_run_id", sql<boolean>`(select status = 'running' from agent_run o where o.id = ${runId})`.as("was_running")])
+    .executeTakeFirst();
+  // 子会话刚转 waiting(对父会话来说已有结果):唤醒挂起等待的父会话
+  if (u?.parent_run_id && u.was_running) await wakeParent(env.ctx, runId);
   return null;
 }

apps/server/src/modules/agent/service.ts

@@ -12,7 +12,7 @@ import { type AgentRunRow, type DB, type Kysely, sql } from "@umt/db";
 import type { ServerContext } from "../types.ts";
 import { buildGoalReport } from "./report.ts";
 import { type AgentEnv, type DriveResult, INVESTIGATE_CAPABILITIES, publishStatus, scopeFor } from "./runner.ts";
-import { cascadeCancel, descendants, descendantUsage, recordChildCompletion } from "./subagents.ts";
+import { cascadeCancel, descendants, descendantUsage, recordChildCompletion, wakeParent } from "./subagents.ts";
 
 // agent_run 生命周期:建行 + 业务任务行 + 入队 runAgent;追加消息 / 中止;终态汇报(业务表核查)与后台调查去重。
 
@@ -340,6 +340,8 @@ export async function finalize(
     const fin = await ctx.db.selectFrom("agent_run").selectAll().where("id", "=", runId).executeTakeFirst();
     if (fin) await recordChildCompletion(ctx, fin);
   }
+  // 子会话落定(含 waiting):唤醒挂起等待它的父会话
+  if (run.parent_run_id) await wakeParent(ctx, runId);
   // 结束前刚到的追加消息:再唤醒一次
   const pending = await ctx.db
     .selectFrom("agent_run_message")

apps/server/src/modules/agent/subagents.ts

@@ -31,9 +31,11 @@ import type { AgentEnv, RunScope } from "./runner.ts";
 //   能力白名单 ⊆ 父、模式不高于父、预算从父剩余预算划拨;settings.pi.subagents{enabled,maxConcurrent,maxDepth}。
 // - 并发:子会话在 runAgent 里先占名额(父会话下同时 running 的子会话 < maxConcurrent,咨询锁内原子判定),
 //   没名额就 waitForFact 挂起(不占 worker、不占模型)。
-// - agent.await:等子会话结束,返回脱敏后的汇报摘要。runAgent 驱动的会话里,子会话还没结束时挂起:
+// - agent.await / agent.spawn{await:true}:等子会话结束,返回脱敏后的汇报摘要。runAgent 驱动的会话里,
-//   关闭本会话(工具调用留在 JSONL 里未完成),runAgent 用 waitForFact 等子会话落定(不占 worker、不占模型),
+//   子会话还没结束时工具调用立即返回(挂起):关闭本会话(工具调用留在 JSONL 里未完成),runAgent 在 agent_run.await_wake
-//   再打开会话 resume —— agent.await 是只读能力(replay=safe),恢复时重放一次拿到结果。见 AwaitSuspension。
+//   登记唤醒信号后用 waitForFact 等子会话落定(不占 worker 槽位、不调用模型);子会话落定时 wakeParent 写 fact
+//   唤醒父会话,再打开会话 resume —— 两个能力都是 replay=safe,恢复时重放一次,子会话汇报作为工具结果续跑。
+//   见 AwaitSuspension。
 // - 事件:父会话运行进程把子会话事件按父 seq 镜像进父事件流(subagent_spawned / subagent_event / subagent_completed);
 //   父会话已不在运行时,由直接写入器在咨询锁内补记 subagent_completed。
 // - 取消:父会话取消递归传播到全部子孙会话;预算:父会话运行时把子孙会话用量计入自己的预算。
@@ -66,7 +68,23 @@ const safe = (s: string | null | undefined, n = 1500) => clip(redactString(s ??
 
 // ── 进程内活跃会话(镜像泵 + 用量缓存) ──
 
-/** agent.await 挂起请求:runAgent 据此 waitForFact,落定后以 resumedAwaits 重开会话 */
+/**
+ * 挂起中的工具调用(agent.spawn{await:true})抛出这个错误:账本记 failed、不缓存结果,
+ * 会话恢复时重放同一调用(幂等键相同 → 同一个子会话)再取汇报。会话此时已关闭,模型看不到它。
+ */
+export class AwaitSuspendedError extends CapabilityError {
+  constructor() {
+    super("precondition", "会话已挂起等待子会话结束,恢复后重放本调用");
+  }
+}
+
+/** runAgent 挂起期间登记在 agent_run.await_wake 的唤醒信号(子会话落定时 wakeParent 按它 signal) */
+export interface AwaitWake {
+  engineRunId: string;
+  fact: string;
+}
+
+/** agent.await / agent.spawn{await:true} 挂起请求:runAgent 据此 waitForFact,落定后以 resumedAwaits 重开会话 */
 export interface AwaitSuspension {
   /** 挂起的工具调用(恢复时重放,同一 invocationId 不再挂起) */
   invocationId: string;
@@ -588,6 +606,53 @@ export async function awaitReady(ctx: ServerContext, parentId: string, sus: Awai
   return rows.every((r) => SETTLED.includes(r.status)) ? true : null;
 }
 
+/** 挂起前登记 / 恢复后清除唤醒信号(幂等) */
+export async function setAwaitWake(ctx: ServerContext, runId: string, wake: AwaitWake | null): Promise<null> {
+  await ctx.db
+    .updateTable("agent_run")
+    .set({ await_wake: wake ? JSON.stringify(wake) : null })
+    .where("id", "=", runId)
+    .execute();
+  return null;
+}
+
+/**
+ * 子会话落定(终态或 waiting)后唤醒挂起等待的父会话:按父会话登记的 await_wake 写 fact + 发引擎信号。
+ * 父会话没挂起时什么也不做;失败只记日志(父会话还有兜底轮询)。
+ */
+export async function wakeParent(ctx: ServerContext, childRunId: string): Promise<boolean> {
+  try {
+    const r = await ctx.db
+      .selectFrom("agent_run as c")
+      .innerJoin("agent_run as p", "p.id", "c.parent_run_id")
+      .select(["p.id as parentId", "p.await_wake as wake"])
+      .where("c.id", "=", childRunId)
+      .executeTakeFirst();
+    const w = r?.wake as AwaitWake | null | undefined;
+    if (!w?.engineRunId || !w.fact) return false;
+    await ctx.engine.signal(w.engineRunId, w.fact, { childRunId });
+    return true;
+  } catch (err) {
+    ctx.logger.warn({ childRunId, err: { message: (err as Error).message } }, "唤醒父会话失败(父会话会兜底轮询)");
+    return false;
+  }
+}
+
+/**
+ * 子会话还没落定时请求挂起:记下等待条件并关闭会话(本调用在 JSONL 里保持未完成),drive 看到 requested 后返回
+ * suspended。同一批里已有别的调用在挂起时不再重复登记。
+ */
+async function requestSuspension(live: LiveRun, invocationId: string, runIds: string[] | null, timeoutSec: number) {
+  if (!live.suspend || live.suspend.requested) return;
+  live.suspend.requested = {
+    invocationId,
+    runIds,
+    deadline: new Date(Date.now() + timeoutSec * 1000).toISOString(),
+  };
+  await new Promise((r) => setTimeout(r, 0));
+  await live.handle.close();
+}
+
 // ── 能力处理器 ──
 
 export interface SpawnDeps {
@@ -614,7 +679,8 @@ async function parentOf(ctx: ServerContext, c: HandlerContext): Promise<AgentRun
 }
 
 export function registerSubagentCapabilities(registry: CapabilityRegistry, ctx: ServerContext, deps: SpawnDeps) {
-  registry.register(capabilitySpec("agent.spawn"), async (input, c) => {
+  // replay=safe:await=true 挂起后会话恢复时要重放本调用取子会话汇报;幂等键相同 → dedupe_key 命中同一个子会话
+  registry.register({ ...capabilitySpec("agent.spawn"), replay: "safe" }, async (input, c) => {
     const parent = await parentOf(ctx, c);
     const s = await ctx.settings.all();
     const cfg = subagentSettings(s);
@@ -655,9 +721,23 @@ export function registerSubagentCapabilities(registry: CapabilityRegistry, ctx:
       child = r.run;
     }
     await liveRun(parent.id)?.pump();
-    const result = input.await
+    let result: SubagentResult | null = null;
-      ? ((await awaitChildren(ctx, parent.id, [child.id], input.timeoutSec, c.signal)).results[0] ?? null)
+    if (input.await) {
-      : null;
+      const live = liveRun(parent.id);
+      const inv = c.invocationId;
+      if (live?.suspend && inv) {
+        // runAgent 驱动:不在工具调用里等,挂起会话(不占 worker),子会话落定后重放本调用
+        const snap = await awaitChildren(ctx, parent.id, [child.id], 0, c.signal);
+        if (!snap.allDone && !live.suspend.resumed.has(inv)) {
+          // 崩溃对账(reconcile:*)只确保子会话已建,不挂起;真正的等待交给恢复后的重放
+          if (!inv.startsWith("reconcile:")) await requestSuspension(live, inv, [child.id], input.timeoutSec);
+          throw new AwaitSuspendedError();
+        }
+        result = snap.results[0] ?? null;
+      } else {
+        result = (await awaitChildren(ctx, parent.id, [child.id], input.timeoutSec, c.signal)).results[0] ?? null;
+      }
+    }
     const cs = (child.scope ?? {}) as Partial<RunScope>;
     return {
       runId: child.id,
@@ -677,14 +757,8 @@ export function registerSubagentCapabilities(registry: CapabilityRegistry, ctx:
     // 恢复时重放:已挂起等过,直接返回当前状态
     const snap = await awaitChildren(ctx, parent.id, input.runIds, 0, c.signal);
     if (snap.allDone || live.suspend.resumed.has(inv) || live.suspend.requested) return snap;
-    // 挂起:记下等待条件,关闭会话(本调用在 JSONL 里保持未完成);drive 看到 requested 后返回 suspended
+    // 挂起:立即返回,会话关闭(本调用在 JSONL 里保持未完成,返回值不会进模型上下文);恢复后重放拿真实结果
-    live.suspend.requested = {
+    await requestSuspension(live, inv, input.runIds?.length ? [...input.runIds] : null, input.timeoutSec);
-      invocationId: inv,
-      runIds: input.runIds?.length ? [...input.runIds] : null,
-      deadline: new Date(Date.now() + input.timeoutSec * 1000).toISOString(),
-    };
-    await new Promise((r) => setTimeout(r, 0));
-    await live.handle.close();
     return snap;
   });
 }

apps/server/src/modules/agent/tasks.ts

@@ -17,14 +17,17 @@ import {
 import { buildGoalReport } from "./report.ts";
 import { type AgentEnv, type DriveResult, drive, goalSettled } from "./runner.ts";
 import { finalize } from "./service.ts";
-import { awaitReady, catchUpChildren, claimSubagentSlot } from "./subagents.ts";
+import { awaitReady, catchUpChildren, claimSubagentSlot, setAwaitWake } from "./subagents.ts";
 
 // 持久任务:runAgent(驱动一次有界 Agent 会话 → 等目标关联的下载/入库落定 → 以业务表汇报)
 // 与 resolveDecision(decision.created → 自动调查;decision.updated(resolved)→ 执行所选处理)。
 
 const id = z.string().uuid();
-/** agent.await 挂起时的唤醒轮询间隔与单个会话最多挂起次数 */
+/**
-const AWAIT_POLL_SEC = 2;
+ * agent.await / agent.spawn{await:true} 挂起时的兜底轮询间隔(正常由子会话落定时的 wakeParent 信号立即唤醒;
+ * 信号在等待开始前送达而丢失时靠它兜底)与单个会话最多挂起次数
+ */
+const AWAIT_POLL_SEC = 10;
 const MAX_AWAIT_SUSPENDS = 100;
 const DB_RETRY = { maximumAttempts: 3, initialInterval: "1s", backoffCoefficient: 2, maximumInterval: "30s" } as const;
 
@@ -77,8 +80,8 @@ export function registerAgentTasks(registry: TaskRegistry, env: () => AgentEnv)
           res = { status: "failed", reason: "error", budget: null, message: "等待子会话名额超时", finalText: "" };
         else {
           res = await t.step.run("drive", () => drive(e, e.ctx.capabilities, runId, t.abortSignal));
-          // agent.await 挂起:会话已关闭,waitForFact 等子会话落定 / 超时 / 取消(不占 worker、不占模型),
+          // agent.await / agent.spawn{await:true} 挂起:会话已关闭;登记唤醒信号后 waitForFact 等子会话落定 / 超时 / 取消
-          // 再重开会话 resume(挂起的 agent.await 重放一次拿到结果)
+          // (不占 worker 槽位、不调用模型),子会话落定时写 fact 唤醒;再重开会话 resume(挂起的调用重放一次拿到结果)
           const resumedAwaits: string[] = [];
           for (let n = 1; res.status === "suspended" && res.suspension; n++) {
             const sus = res.suspension;
@@ -87,11 +90,15 @@ export function registerAgentTasks(registry: TaskRegistry, env: () => AgentEnv)
               break;
             }
             const waitMs = Math.max(0, Date.parse(sus.deadline) - Date.now());
-            await t.step.waitForFact<true>(`subagent-await-${n}`, {
+            const fact = `subagent-await-${n}`;
+            const engineRunId = t.runId;
+            await t.step.run(`${fact}-arm`, () => setAwaitWake(e.ctx, runId, { engineRunId, fact }));
+            await t.step.waitForFact<true>(fact, {
               check: () => awaitReady(e.ctx, runId, sus),
               timeout: `${AWAIT_POLL_SEC}s`,
               maxRounds: Math.max(1, Math.ceil(waitMs / 1000 / AWAIT_POLL_SEC) + 1),
             });
+            await t.step.run(`${fact}-disarm`, () => setAwaitWake(e.ctx, runId, null));
             resumedAwaits.push(sus.invocationId);
             const resumed = [...resumedAwaits];
             res = await t.step.run(`drive-${n}`, () =>

apps/server/test/e2e/e11-subagents.test.ts

@@ -87,6 +87,39 @@ const abortParentScript: FakeScript = {
   finalText: "不应走到这里",
 };
 
+const SPAWN_AWAIT_GOAL = "派生并等待:检查《沙丘》原声版本";
+const SPAWN_AWAIT_CHILD = "子目标:检查《沙丘》原声版本";
+const spawnAwaitScript: FakeScript = {
+  name: "e11-spawn-await",
+  match: SPAWN_AWAIT_GOAL,
+  steps: [
+    {
+      toolCalls: [
+        {
+          capability: "agent.spawn",
+          input: {
+            goal: SPAWN_AWAIT_CHILD,
+            capabilityAllowlist: READONLY,
+            mode: "plan_only",
+            await: true,
+            timeoutSec: 300,
+          },
+        },
+      ],
+    },
+  ],
+  finalText: (results) => {
+    const r = lastOk(results, "agent.spawn")?.result;
+    return `子会话 ${r?.status ?? "无结果"}:${r?.summary ?? ""}`;
+  },
+};
+const spawnAwaitChild: FakeScript = {
+  name: "e11-spawn-await-child",
+  match: SPAWN_AWAIT_CHILD,
+  steps: [{ toolCalls: [{ capability: "inventory.query", input: { query: "沙丘", limit: 1 } }] }],
+  finalText: "《沙丘》原声版本已在库",
+};
+
 const slowChild: FakeScript = {
   name: "e11-slow",
   match: /^子目标:慢任务/,
@@ -98,7 +131,16 @@ describe.skipIf(!hasPg)("E11 Pi 子代理(agent.spawn / agent.await)", () => {
   let e: E2E;
 
   beforeAll(async () => {
-    e = await createE2E("e11", { fakeScripts: [parentScript, duneScript, oppieScript, abortParentScript, slowChild] });
+    e = await createE2E("e11", { fakeScripts: [
+        parentScript,
+        duneScript,
+        oppieScript,
+        abortParentScript,
+        slowChild,
+        spawnAwaitScript,
+        spawnAwaitChild,
+      ],
+    });
     await e.settings({ pi: { subagents: { enabled: true, maxConcurrent: 1, maxDepth: 1 } } });
   }, 120_000);
 
@@ -106,6 +148,31 @@ describe.skipIf(!hasPg)("E11 Pi 子代理(agent.spawn / agent.await)", () => {
     await e?.close();
   }, 60_000);
 
+  /** 父会话的引擎 run(task.engine_run_id) */
+  const engineRunOf = async (runId: string) => {
+    const t = await e.db
+      .selectFrom("task")
+      .select("engine_run_id")
+      .where("subject_type", "=", "agent_run")
+      .where("subject_id", "=", runId)
+      .executeTakeFirstOrThrow();
+    return t.engine_run_id as string;
+  };
+  /** 等到:父会话已挂起(登记了唤醒信号)且没有任何 run 被 worker 持有(io / agent 槽位全部空闲) */
+  const suspendedAndIdle = (parentId: string) =>
+    waitFor(
+      async () => {
+        const p = await runRow(e, parentId);
+        if (!p.await_wake) return null;
+        const held = (await e.booted.ctx.engine.list({ status: "running", limit: 200 })).filter(
+          (r) => r.status === "running",
+        );
+        return held.length === 0 ? { wake: p.await_wake as Any } : null;
+      },
+      30_000,
+      `父会话 ${parentId} 挂起且 worker 槽位空闲`,
+    );
+
   const settle = (runId: string, statuses: string[], ms = 90_000) =>
     waitFor(
       async () => {
@@ -334,6 +401,10 @@ describe.skipIf(!hasPg)("E11 Pi 子代理(agent.spawn / agent.await)", () => {
       "父会话派生两个子会话并开始等待",
     );
     expect(kids.every((k) => k.status === "queued")).toBe(true);
+    // agent.await 挂起:父会话不占 worker(引擎 run 未被持有),子会话在等名额也不占 → io / agent 槽位空闲
+    const idle = await suspendedAndIdle(parentId);
+    expect(idle.wake.engineRunId).toBe(await engineRunOf(parentId));
+    expect((await e.booted.ctx.engine.get(idle.wake.engineRunId))?.status).toBe("waiting");
 
     const ab = await e.api("POST", `/agent/runs/${parentId}/abort`, { reason: "e11 中止" });
     expect(ab.status).toBe(200);
@@ -349,4 +420,90 @@ describe.skipIf(!hasPg)("E11 Pi 子代理(agent.spawn / agent.await)", () => {
     expect(b.cancel_requested_at).not.toBeNull();
     await e.db.updateTable("agent_run").set({ status: "cancelled" }).where("id", "=", blocker.id).execute();
   }, 120_000);
+  it("agent.spawn{await:true} 挂起:等待期间 io/agent 槽位空闲,子会话落定写 fact 唤醒父会话,子汇报作为工具结果续跑", async () => {
+    await e.worker?.stop();
+    const r = await e.api("POST", "/agent/runs", {
+      goal: SPAWN_AWAIT_GOAL,
+      mode: "plan_only",
+      capabilityAllowlist: [...READONLY, "agent.spawn", "agent.await"],
+    });
+    expect(r.status).toBe(201);
+    const parentId = r.body.data.id as string;
+    // 占住唯一名额:真实子会话排队,父会话必须挂起等待
+    const blocker = await e.db
+      .insertInto("agent_run")
+      .values({
+        trigger: "subagent",
+        goal: "占名额",
+        status: "running",
+        mode: "plan_only",
+        scope: JSON.stringify({ capabilities: READONLY }),
+        budget: JSON.stringify({}),
+        parent_run_id: parentId,
+        depth: 1,
+        started_at: new Date(),
+      })
+      .returning("id")
+      .executeTakeFirstOrThrow();
+    await e.startWorker();
+
+    const idle = await suspendedAndIdle(parentId);
+    const engineRunId = await engineRunOf(parentId);
+    expect(idle.wake).toEqual({ engineRunId, fact: "subagent-await-1" });
+    expect((await e.booted.ctx.engine.get(engineRunId))?.status).toBe("waiting");
+    const child = await e.db
+      .selectFrom("agent_run")
+      .selectAll()
+      .where("parent_run_id", "=", parentId)
+      .where("id", "<>", blocker.id)
+      .executeTakeFirstOrThrow();
+    expect(child.status).toBe("queued");
+    // 挂起的调用没有把"未结束"的结果交给模型:工具调用只有开始、没有结束
+    const before = await runEvents(e, parentId);
+    expect(before.some((x) => x.type === "tool_call_end" && (x.payload as Any).capabilityId === "agent.spawn")).toBe(
+      false,
+    );
+
+    // 放出名额 → 子会话跑完 → 写 fact 唤醒父会话(不用等兜底轮询)
+    await e.db
+      .updateTable("agent_run")
+      .set({ status: "succeeded", finished_at: new Date() })
+      .where("id", "=", blocker.id)
+      .execute();
+    const doneChild = await settle(child.id, ["succeeded", "failed", "cancelled", "budget_exceeded"]);
+    expect(doneChild.status).toBe("succeeded");
+    const parent = await settle(parentId, ["succeeded", "failed", "cancelled", "budget_exceeded"], 30_000);
+    expect(parent.status).toBe("succeeded");
+    expect(parent.await_wake).toBeNull();
+    const fact = await e.db
+      .selectFrom("tasks_fact")
+      .select(["name", "payload"])
+      .where("run_id", "=", engineRunId)
+      .where("name", "=", "subagent-await-1")
+      .execute();
+    expect(fact.map((f) => (f.payload as Any).childRunId)).toContain(child.id);
+
+    const events = await runEvents(e, parentId);
+    const spawnEnd = events.find(
+      (x) => x.type === "tool_call_end" && (x.payload as Any).capabilityId === "agent.spawn",
+    )!;
+    expect(spawnEnd).toBeTruthy();
+    expect((spawnEnd.payload as Any).isError).toBe(false);
+    expect((spawnEnd.payload as Any).recovery).toBe(true);
+    expect(events.filter((x) => x.type === "run_started").map((x) => (x.payload as Any).resumed)).toEqual([
+      false,
+      true,
+    ]);
+    const done = events.find((x) => x.type === "run_completed")!;
+    expect((done.payload as Any).finalText).toContain("子会话 succeeded");
+    expect((done.payload as Any).finalText).toContain("《沙丘》原声版本已在库");
+    // 只派生了一个子会话(重放命中同一个 dedupe_key)
+    const kids = await e.db
+      .selectFrom("agent_run")
+      .select("id")
+      .where("parent_run_id", "=", parentId)
+      .where("id", "<>", blocker.id)
+      .execute();
+    expect(kids).toHaveLength(1);
+  }, 120_000);
 });

docs/runbook/agent.md

@@ -200,7 +200,8 @@ OpenRouter 换到的是永久 key,不刷新。
 - 预算:子会话预算从父会话剩余预算划拨(缺省剩余的一半,请求超过剩余直接拒绝),子会话超预算只结束它自己;父会话的工具调用 / token / 费用预算把子孙会话的实际用量算在内。
 - 取消:中止父会话会递归取消全部未结束的子孙会话(排队中的也一样)。
 - 事件:子会话的开始、工具调用、结束按父会话 seq 镜像为 `subagent_spawned` / `subagent_event` / `subagent_completed`,SSE 上以 `agent.tool_call`(能力 `agent.spawn`)提示;会话详情返回 `parent`、`children` 与 `familyUsage`(会话树合计)。
-- `agent.await` 在父会话的工具调用里轮询业务表等待,不调用模型,但等待期间父会话占着一个 Agent worker 槽位,超时(缺省 600 秒)返回 pending。
+- 等待(`agent.await`,以及 `agent.spawn {await:true}`):子会话还没落定时工具调用立即返回,父会话挂起——会话文件里这次调用保持未完成,父 run 在 `agent_run.await_wake` 登记唤醒信号 `{engineRunId, fact}` 后用 `waitForFact` 等待,**不占 io / agent worker 槽位,也不调用模型**。子会话落定(终态或 waiting)时 `wakeParent` 按登记写 fact 并发引擎信号,父会话立刻重开会话续跑:挂起的调用(两个能力都是 replay=safe)重放一次,子会话汇报作为工具结果交给模型。信号丢失(子会话恰在父会话开始等待前落定)时靠 10 秒兜底轮询;超时(缺省 600 秒)后未结束的子会话标 pending,父会话被取消时立即唤醒按取消收尾。`agent.spawn {await:true}` 挂起那次调用在账本里记为 failed(`会话已挂起…`,不缓存结果),重放时幂等键相同,命中同一个子会话。
+- 排查:父会话挂起期间 `agent_run.await_wake` 非空、引擎 run 状态为 waiting(`GET /engine/runs/{id}`);恢复后 `await_wake` 清空,事件流里第二个 `run_started` 的 `resumed=true`,重放调用的 `tool_call_end.recovery=true`。
 - 成本:每个子会话都是一次完整的模型会话(独立上下文,有自己的系统提示与工具定义),token 成本大致随子会话数线性增加,也计入每日 Agent 运行次数。
 
 ## fake 模式演示

packages/db/migrations/0037_agent_await_passkey.ts

@@ -0,0 +1,63 @@
+import type { Kysely } from "kysely";
+import { dropTables, entityTable, execDdl, oneOf } from "../src/migration-helpers.ts";
+
+// C1-B Agent 与账户遗留收尾:
+// - agent_run.await_wake:父会话挂起等待子会话(agent.await / agent.spawn{await:true})时登记的唤醒信号
+//   {engineRunId, fact};子会话落定时按它写 fact + 发引擎信号,父会话恢复后清空。
+// - admin_recovery_code:TOTP 备用恢复码(一次性,argon2id 哈希存库,used_at 非空即已用)。
+// - admin_passkey:WebAuthn Passkey(COSE 公钥、签名计数器、传输方式、名称),可多把。
+// - webauthn_challenge:注册 / 登录挑战(一次性、5 分钟有效;条件更新消费,防重放)。
+
+// biome-ignore lint/suspicious/noExplicitAny: 迁移不依赖应用表类型
+export async function up(db: Kysely<any>): Promise<void> {
+  await execDdl(
+    db,
+    `
+alter table agent_run add column await_wake jsonb;
+
+create table admin_recovery_code (
+  id uuid primary key default gen_random_uuid(),
+  admin_user_id uuid not null references admin_user (id) on delete cascade,
+  code_hash text not null,
+  used_at timestamptz,
+  created_at timestamptz not null default now()
+);
+create index admin_recovery_code_unused_idx on admin_recovery_code (admin_user_id) where used_at is null;
+
+${entityTable(
+  "admin_passkey",
+  `
+  admin_user_id uuid not null references admin_user (id) on delete cascade,
+  credential_id text not null,
+  public_key bytea not null,
+  counter bigint not null default 0 check (counter >= 0),
+  transports jsonb not null default '[]'::jsonb,
+  device_type text,
+  backed_up boolean not null default false,
+  name text not null,
+  last_used_at timestamptz,
+  constraint admin_passkey_credential_key unique (credential_id)`,
+)}
+
+create table webauthn_challenge (
+  id uuid primary key default gen_random_uuid(),
+  purpose text not null ${oneOf("purpose", ["register", "login"])},
+  challenge text not null,
+  admin_user_id uuid references admin_user (id) on delete cascade,
+  expires_at timestamptz not null,
+  used_at timestamptz,
+  created_at timestamptz not null default now()
+);
+create index webauthn_challenge_expires_idx on webauthn_challenge (expires_at);
+`,
+  );
+}
+
+// biome-ignore lint/suspicious/noExplicitAny: 同上
+export async function down(db: Kysely<any>): Promise<void> {
+  await execDdl(
+    db,
+    `${dropTables(["webauthn_challenge", "admin_passkey", "admin_recovery_code"])}
+alter table agent_run drop column if exists await_wake;`,
+  );
+}

packages/db/src/types.ts

@@ -246,6 +246,7 @@ export type TaskStatus = "pending" | "running" | "waiting" | "succeeded" | "fail
 export type TasksOpLedgerStatus = "started" | "succeeded";
 export type TitleAliasKind = "original" | "translated" | "short" | "site_title" | "romanized" | "other";
 export type TitleAliasSource = "tmdb" | "user" | "site" | "agent" | "nfo" | "import";
+export type WebauthnChallengePurpose = "register" | "login";
 
 export interface AcquisitionPlanTable {
   id: Generated<string>;
@@ -296,6 +297,29 @@ export interface AcquisitionSlotTable {
   position: Generated<number>;
 }
 
+export interface AdminPasskeyTable {
+  id: Generated<string>;
+  admin_user_id: string;
+  credential_id: string;
+  public_key: Buffer;
+  counter: Generated<number>;
+  transports: Generated<Json>;
+  device_type: string | null;
+  backed_up: Generated<boolean>;
+  name: string;
+  last_used_at: Timestamptz | null;
+  created_at: GeneratedTimestamptz;
+  updated_at: GeneratedTimestamptz;
+}
+
+export interface AdminRecoveryCodeTable {
+  id: Generated<string>;
+  admin_user_id: string;
+  code_hash: string;
+  used_at: Timestamptz | null;
+  created_at: GeneratedTimestamptz;
+}
+
 export interface AdminSessionTable {
   id: Generated<string>;
   admin_user_id: string;
@@ -355,6 +379,7 @@ export interface AgentRunTable {
   upstream_id: string | null;
   depth: Generated<number>;
   spawn_reason: string | null;
+  await_wake: Json | null;
 }
 
 export interface AgentRunEventTable {
@@ -1552,9 +1577,21 @@ export interface TrashItemTable {
   updated_at: GeneratedTimestamptz;
 }
 
+export interface WebauthnChallengeTable {
+  id: Generated<string>;
+  purpose: WebauthnChallengePurpose;
+  challenge: string;
+  admin_user_id: string | null;
+  expires_at: Timestamptz;
+  used_at: Timestamptz | null;
+  created_at: GeneratedTimestamptz;
+}
+
 export interface DB {
   acquisition_plan: AcquisitionPlanTable;
   acquisition_slot: AcquisitionSlotTable;
+  admin_passkey: AdminPasskeyTable;
+  admin_recovery_code: AdminRecoveryCodeTable;
   admin_session: AdminSessionTable;
   admin_user: AdminUserTable;
   agent_run: AgentRunTable;
@@ -1627,6 +1664,7 @@ export interface DB {
   tasks_run_meta: TasksRunMetaTable;
   title_alias: TitleAliasTable;
   trash_item: TrashItemTable;
+  webauthn_challenge: WebauthnChallengeTable;
 }
 
 export type AcquisitionPlanRow = Selectable<AcquisitionPlanTable>;
@@ -1635,6 +1673,12 @@ export type AcquisitionPlanUpdate = Updateable<AcquisitionPlanTable>;
 export type AcquisitionSlotRow = Selectable<AcquisitionSlotTable>;
 export type NewAcquisitionSlot = Insertable<AcquisitionSlotTable>;
 export type AcquisitionSlotUpdate = Updateable<AcquisitionSlotTable>;
+export type AdminPasskeyRow = Selectable<AdminPasskeyTable>;
+export type NewAdminPasskey = Insertable<AdminPasskeyTable>;
+export type AdminPasskeyUpdate = Updateable<AdminPasskeyTable>;
+export type AdminRecoveryCodeRow = Selectable<AdminRecoveryCodeTable>;
+export type NewAdminRecoveryCode = Insertable<AdminRecoveryCodeTable>;
+export type AdminRecoveryCodeUpdate = Updateable<AdminRecoveryCodeTable>;
 export type AdminSessionRow = Selectable<AdminSessionTable>;
 export type NewAdminSession = Insertable<AdminSessionTable>;
 export type AdminSessionUpdate = Updateable<AdminSessionTable>;
@@ -1851,3 +1895,6 @@ export type TitleAliasUpdate = Updateable<TitleAliasTable>;
 export type TrashItemRow = Selectable<TrashItemTable>;
 export type NewTrashItem = Insertable<TrashItemTable>;
 export type TrashItemUpdate = Updateable<TrashItemTable>;
+export type WebauthnChallengeRow = Selectable<WebauthnChallengeTable>;
+export type NewWebauthnChallenge = Insertable<WebauthnChallengeTable>;
+export type WebauthnChallengeUpdate = Updateable<WebauthnChallengeTable>;