feat: add per-project message trigger wait queue

- TriggerQueue: FIFO per-project queue, max 5 items, 5min TTL expiry
- Replace reject-when-locked with queue: users get position feedback
- Run completion auto-starts next queued trigger (skips expired items)
- /reset clears project queue; 60s periodic purge interval
- Add unit tests (10) for queue lifecycle and edge cases

hub/src/feishu/trigger.ts

@@ -37,9 +37,12 @@ import { readFeishuContext } from "./read.js";
 import { MessageBatcher, messageBatchKey, type MessageBatcherOptions } from "./messageBatcher.js";
 import { ApprovalManager } from "./approval.js";
 import { SenderNameCache } from "./senderCache.js";
+import { TriggerQueue, triggerQueue as defaultTriggerQueue, type QueuedTrigger } from "./triggerQueue.js";
 
 export { ApprovalManager } from "./approval.js";
 export type { ApprovalResult, PendingApproval } from "./approval.js";
+export { TriggerQueue, triggerQueue } from "./triggerQueue.js";
+export type { QueuedTrigger, TriggerQueueOptions } from "./triggerQueue.js";
 export const senderNameCache = new SenderNameCache();
 
 interface TriggerDeps {
@@ -49,6 +52,7 @@ interface TriggerDeps {
   readonly runAgent?: (req: RunRequest) => Promise<RunResult>;
   readonly authorizer?: PermissionAuthorizer | undefined;
   readonly messageBatcherOptions?: MessageBatcherOptions | undefined;
+  readonly triggerQueue?: TriggerQueue | undefined;
 }
 
 interface TriggerActor {
@@ -65,6 +69,8 @@ interface TriggerRunContext {
   readonly actor: TriggerActor;
 }
 
+type StartAgentRunOutcome = "started" | "queued" | "rejected" | "locked" | "skipped";
+
 export interface TriggerHandler {
   (event: MessageReceiveEvent, rt: FeishuRuntime): Promise<void>;
   readonly onCardAction: (event: CardActionEvent, rt: FeishuRuntime) => Promise<void>;
@@ -80,6 +86,7 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
   const authorizer = deps.authorizer ?? createPermissionAuthorizer(deps.prisma);
   const runAgent = deps.runAgent ?? defaultRunAgent;
   const approvalManager = new ApprovalManager();
+  const triggerQueue = deps.triggerQueue ?? defaultTriggerQueue;
   const batchContexts = new Map<string, TriggerRunContext>();
   const messageBatcher = new MessageBatcher(async (mergedText, key) => {
     if (key === undefined) {
@@ -100,15 +107,19 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
     }
   }, deps.messageBatcherOptions);
 
-  async function startAgentRun(context: TriggerRunContext, cleanPrompt: string): Promise<void> {
+  async function startAgentRun(
+    context: TriggerRunContext,
+    cleanPrompt: string,
+    options: { readonly queueIfLocked?: boolean } = {},
+  ): Promise<StartAgentRunOutcome> {
     const { msg, rt, chatId, projectId, senderOpenId, actor } = context;
+    const queueIfLocked = options.queueIfLocked ?? true;
 
-    // ADR-0002: if locked by another run, reply busy.
+    // ADR-0002: if locked by another run, enqueue the trigger for this project.
     const existing = await currentLockRunId(deps.prisma, projectId);
     if (existing !== null) {
-      await reactToMessage(rt, msg.message_id, "OnIt");
-      await sendText(rt, chatId, "项目正在处理中,请稍候。");
-      return;
+      if (!queueIfLocked) return "locked";
+      return enqueueLockedTrigger(context, cleanPrompt);
     }
 
     const project = await deps.prisma.project.findUnique({
@@ -117,7 +128,7 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
     });
     if (project === null) {
       deps.logger.error({ projectId }, "feishu trigger: project missing");
-      return;
+      return "skipped";
     }
 
     // ADR-0017: role-as-data. Parse a leading `/<role>` command; unknown
@@ -148,7 +159,7 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
         },
       });
       await sendText(rt, chatId, `无权限使用角色 ${roleId}。`);
-      return;
+      return "skipped";
     }
     const role = models.role(roleId);
     const model = models.resolve(undefined, roleId);
@@ -234,9 +245,8 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
         action: "run.lock_race",
         metadata: { sender: await senderAuditMetadata(rt, senderOpenId) },
       });
-      await reactToMessage(rt, msg.message_id, "OnIt");
-      await sendText(rt, chatId, "项目正在处理中,请稍候。");
-      return;
+      if (!queueIfLocked) return "locked";
+      return enqueueLockedTrigger(context, cleanPrompt);
     }
 
     const projectCtx: ProjectContext = {
@@ -344,7 +354,85 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
         } catch (e) {
           deps.logger.warn({ runId: run.id, err: e instanceof Error ? e.message : String(e) }, "trigger: could not release lock");
         }
+        try {
+          await drainTriggerQueue(projectId, rt);
+        } catch (e) {
+          deps.logger.warn({ projectId, err: e instanceof Error ? e.message : String(e) }, "trigger: could not drain trigger queue");
+        }
       });
+    return "started";
+  }
+
+  async function enqueueLockedTrigger(context: TriggerRunContext, cleanPrompt: string): Promise<StartAgentRunOutcome> {
+    const position = triggerQueue.enqueue(context.projectId, {
+      chatId: context.chatId,
+      prompt: cleanPrompt,
+      msg: context.msg,
+      senderOpenId: context.senderOpenId,
+      actor: context.actor,
+    });
+    if (position === 0) {
+      await reactToMessage(context.rt, context.msg.message_id, "OnIt");
+      await sendText(context.rt, context.chatId, "队列已满，请稍后再试");
+      return "rejected";
+    }
+
+    await sendText(context.rt, context.chatId, `已加入队列（第${position}位），当前处理完成后将自动开始`);
+    return "queued";
+  }
+
+  async function drainTriggerQueue(projectId: string, rt: FeishuRuntime): Promise<void> {
+    while (triggerQueue.hasPending(projectId)) {
+      const existing = await currentLockRunId(deps.prisma, projectId);
+      if (existing !== null) return;
+
+      const queued = triggerQueue.peek(projectId);
+      if (queued === null) return;
+      if (triggerQueue.isExpired(queued)) {
+        triggerQueue.dequeue(projectId);
+        deps.logger.info(
+          { projectId, messageId: queued.msg.message_id, enqueuedAt: queued.enqueuedAt },
+          "feishu trigger: dropped expired queued trigger",
+        );
+        continue;
+      }
+
+      const next = triggerQueue.dequeue(projectId);
+      if (next === null) return;
+      const outcome = await startAgentRun(contextFromQueuedTrigger(next, rt), next.prompt, { queueIfLocked: false });
+      if (outcome === "started") return;
+      if (outcome === "locked") {
+        requeueTrigger(next);
+        return;
+      }
+    }
+  }
+
+  function contextFromQueuedTrigger(trigger: QueuedTrigger, rt: FeishuRuntime): TriggerRunContext {
+    return {
+      msg: trigger.msg,
+      rt,
+      chatId: trigger.chatId,
+      projectId: trigger.projectId,
+      senderOpenId: trigger.senderOpenId,
+      actor: trigger.actor,
+    };
+  }
+
+  function requeueTrigger(trigger: QueuedTrigger): void {
+    const position = triggerQueue.enqueue(trigger.projectId, {
+      chatId: trigger.chatId,
+      prompt: trigger.prompt,
+      msg: trigger.msg,
+      senderOpenId: trigger.senderOpenId,
+      actor: trigger.actor,
+    });
+    if (position === 0) {
+      deps.logger.warn(
+        { projectId: trigger.projectId, messageId: trigger.msg.message_id },
+        "feishu trigger: could not requeue locked queued trigger",
+      );
+    }
   }
 
   const onCardAction = async (event: CardActionEvent, rt: FeishuRuntime): Promise<void> => {
@@ -479,7 +567,7 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
 
     // Slash commands: session management, not agent runs. These bypass the
     // batcher. Session commands bypass the lock because they don't create runs;
-    // role/unknown slash prompts still run immediately through the normal lock.
+    // role/unknown slash prompts still use the normal run path and queue if locked.
     if (cleanPrompt.startsWith("/")) {
       const cmd = cleanPrompt.split(/\s+/)[0];
       switch (cmd) {
@@ -513,6 +601,10 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
             where: { projectId, archivedAt: null },
             data: { archivedAt: new Date() },
           });
+          const cleared = triggerQueue.clear(projectId);
+          if (cleared > 0) {
+            deps.logger.info({ projectId, cleared }, "feishu trigger: cleared queued triggers on reset");
+          }
           await sendText(rt, chatId, "已重置,下次 @bot 将从头开始。");
           return;
         }
@@ -526,8 +618,7 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
     if (msg.message_type === "text") {
       const existing = await currentLockRunId(deps.prisma, projectId);
       if (existing !== null) {
-        await reactToMessage(rt, msg.message_id, "OnIt");
-        await sendText(rt, chatId, "项目正在处理中,请稍候。");
+        await enqueueLockedTrigger(runContext, cleanPrompt);
         return;
       }
       const key = messageBatchKey(chatId, senderOpenId);

hub/src/feishu/triggerQueue.ts

@@ -0,0 +1,100 @@
+import type { MessageReceiveEvent } from "./client.js";
+
+export interface QueuedTrigger {
+  readonly projectId: string;
+  readonly chatId: string;
+  readonly prompt: string;
+  readonly msg: MessageReceiveEvent["message"];
+  readonly senderOpenId: string;
+  readonly actor: { readonly feishuOpenId: string; readonly chatId: string };
+  readonly enqueuedAt: number;
+}
+
+export interface TriggerQueueOptions {
+  readonly maxQueueSize?: number;
+  readonly maxWaitMs?: number;
+}
+
+const DEFAULT_MAX_QUEUE_SIZE = 5;
+const DEFAULT_MAX_WAIT_MS = 300_000;
+
+export class TriggerQueue {
+  readonly maxQueueSize: number;
+  readonly maxWaitMs: number;
+
+  private readonly queues = new Map<string, QueuedTrigger[]>();
+
+  constructor(options: TriggerQueueOptions = {}) {
+    this.maxQueueSize = Math.max(0, Math.trunc(options.maxQueueSize ?? DEFAULT_MAX_QUEUE_SIZE));
+    this.maxWaitMs = Math.max(0, Math.trunc(options.maxWaitMs ?? DEFAULT_MAX_WAIT_MS));
+  }
+
+  enqueue(projectId: string, trigger: Omit<QueuedTrigger, "projectId" | "enqueuedAt">): number {
+    const queue = this.queues.get(projectId) ?? [];
+    if (queue.length >= this.maxQueueSize) return 0;
+
+    queue.push({
+      ...trigger,
+      projectId,
+      enqueuedAt: Date.now(),
+    });
+    if (!this.queues.has(projectId)) {
+      this.queues.set(projectId, queue);
+    }
+    return queue.length;
+  }
+
+  dequeue(projectId: string): QueuedTrigger | null {
+    const queue = this.queues.get(projectId);
+    if (queue === undefined || queue.length === 0) return null;
+
+    const next = queue.shift() ?? null;
+    if (queue.length === 0) {
+      this.queues.delete(projectId);
+    }
+    return next;
+  }
+
+  peek(projectId: string): QueuedTrigger | null {
+    return this.queues.get(projectId)?.[0] ?? null;
+  }
+
+  length(projectId: string): number {
+    return this.queues.get(projectId)?.length ?? 0;
+  }
+
+  hasPending(projectId: string): boolean {
+    return this.length(projectId) > 0;
+  }
+
+  purgeExpired(): number {
+    const now = Date.now();
+    let removed = 0;
+    for (const [projectId, queue] of this.queues) {
+      const fresh = queue.filter((trigger) => !this.isExpired(trigger, now));
+      removed += queue.length - fresh.length;
+      if (fresh.length === 0) {
+        this.queues.delete(projectId);
+      } else if (fresh.length !== queue.length) {
+        this.queues.set(projectId, fresh);
+      }
+    }
+    return removed;
+  }
+
+  clear(projectId: string): number {
+    const count = this.length(projectId);
+    this.queues.delete(projectId);
+    return count;
+  }
+
+  clearAll(): void {
+    this.queues.clear();
+  }
+
+  isExpired(trigger: QueuedTrigger, now = Date.now()): boolean {
+    return trigger.enqueuedAt + this.maxWaitMs < now;
+  }
+}
+
+export const triggerQueue = new TriggerQueue();

hub/src/server.ts

@@ -16,6 +16,7 @@ import { prisma } from "./db.js";
 import { createEnvRuntimeSettings } from "./settings/runtime.js";
 import { createLarkClient, startFeishuListenerWithClient } from "./feishu/client.js";
 import { makeTriggerHandler } from "./feishu/trigger.js";
+import { triggerQueue } from "./feishu/triggerQueue.js";
 
 function requireEnv(name: string): string {
   const v = process.env[name];
@@ -61,6 +62,13 @@ async function main(): Promise<void> {
   if (feishuListenerEnabled) {
     const feishuConfig = { appId: feishuAppId, appSecret: feishuAppSecret, botOpenId: feishuBotOpenId };
     const larkClient = createLarkClient(feishuConfig);
+    const triggerQueuePurgeTimer = setInterval(() => {
+      const removed = triggerQueue.purgeExpired();
+      if (removed > 0) {
+        app.log.info({ removed }, "feishu trigger queue: purged expired triggers");
+      }
+    }, 60_000);
+    triggerQueuePurgeTimer.unref();
     const trigger = makeTriggerHandler({ prisma, settings: runtimeSettings, logger: app.log });
     startFeishuListenerWithClient(feishuConfig, larkClient, app.log, trigger, trigger.onCardAction);
   } else {

hub/test/integration/trigger.test.ts

@@ -2,6 +2,7 @@ import { describe, it, expect, beforeEach, afterAll, vi } from "vitest";
 import { prisma, resetDb, mockFeishuRuntime, seedProject, silentLogger } from "./helpers.js";
 import { InMemoryModelRegistry } from "../../src/agent/models.js";
 import { makeTriggerHandler, extractPrompt } from "../../src/feishu/trigger.js";
+import { TriggerQueue } from "../../src/feishu/triggerQueue.js";
 import type { MessageReceiveEvent } from "../../src/feishu/client.js";
 import type { RunRequest, RunResult } from "../../src/agent/runner.js";
 import type { RuntimeSettings } from "../../src/settings/runtime.js";
@@ -179,7 +180,7 @@ describe("trigger full lifecycle (integration)", () => {
     expect(runs).toHaveLength(0);
   });
 
-  it("replies busy when project is already locked (ADR-0002)", async () => {
+  it("queues a text trigger when project is already locked (ADR-0002)", async () => {
     await seedProject("proj-3", "chat-3");
     // Manually create a lock by inserting a run + lock.
     const existingRun = await prisma.agentRun.create({
@@ -192,13 +193,59 @@ describe("trigger full lifecycle (integration)", () => {
     const trigger = makeTriggerHandler({ prisma, settings, logger: silentLogger, runAgent, messageBatcherOptions: { maxMessages: 1 } });
     await trigger(makeEvent("chat-3", "@_user_1 写教案"), rt);
 
-    expect(rt.sentTexts).toContain("项目正在处理中,请稍候。");
+    expect(rt.sentTexts).toContain("已加入队列（第1位），当前处理完成后将自动开始");
+    expect(rt.reactions.some((reaction) => reaction.emoji === "OnIt")).toBe(false);
     expect(runAgentCalls).toHaveLength(0);
     // No new run created.
     const runs = await prisma.agentRun.findMany();
     expect(runs).toHaveLength(1);
   });
 
+  it("starts the next queued text trigger when the current run finishes", async () => {
+    await seedProject("proj-3b", "chat-3b");
+    const firstRun = deferred<RunResult>();
+    const secondRun = deferred<RunResult>();
+    const pendingRuns = [firstRun, secondRun];
+    const queuedRunAgent: TestRunner = async (req) => {
+      runAgentCalls.push(req);
+      req.onStream?.({ type: "text-delta", text: `mock response ${runAgentCalls.length}` });
+      const pendingRun = pendingRuns.shift();
+      if (pendingRun === undefined) {
+        throw new Error("unexpected extra run");
+      }
+      return pendingRun.promise;
+    };
+    const trigger = makeTriggerHandler({
+      prisma,
+      settings,
+      logger: silentLogger,
+      runAgent: queuedRunAgent,
+      messageBatcherOptions: { maxMessages: 1 },
+    });
+
+    await trigger(makeEvent("chat-3b", "@_user_1 第一个请求"), rt);
+    await vi.waitFor(() => {
+      expect(runAgentCalls).toHaveLength(1);
+    });
+
+    await trigger(makeEvent("chat-3b", "@_user_1 第二个请求"), rt);
+    expect(rt.sentTexts).toContain("已加入队列（第1位），当前处理完成后将自动开始");
+    expect(runAgentCalls).toHaveLength(1);
+
+    firstRun.resolve(completedRunResult("first done", "sdk-session-first"));
+    await vi.waitFor(() => {
+      expect(runAgentCalls).toHaveLength(2);
+    });
+    expect(runAgentCalls[1]?.prompt).toBe("第二个请求");
+
+    secondRun.resolve(completedRunResult("second done", "sdk-session-second"));
+    await vi.waitFor(async () => {
+      const runs = await prisma.agentRun.findMany({ orderBy: { createdAt: "asc" } });
+      expect(runs).toHaveLength(2);
+      expect(runs.every((run) => run.status === "COMPLETED")).toBe(true);
+    });
+  });
+
   it("ignores messages from unbound chats (ADR-0001)", async () => {
     await seedProject("proj-4", "chat-4");
     const trigger = makeTriggerHandler({ prisma, settings, logger: silentLogger, runAgent, messageBatcherOptions: { maxMessages: 1 } });
@@ -278,7 +325,15 @@ describe("trigger full lifecycle (integration)", () => {
 
   it("/reset archives current session", async () => {
     await seedProject("proj-8", "chat-8");
-    const trigger = makeTriggerHandler({ prisma, settings, logger: silentLogger, runAgent, messageBatcherOptions: { maxMessages: 1 } });
+    const queue = new TriggerQueue();
+    const trigger = makeTriggerHandler({
+      prisma,
+      settings,
+      logger: silentLogger,
+      runAgent,
+      messageBatcherOptions: { maxMessages: 1 },
+      triggerQueue: queue,
+    });
 
     await trigger(makeEvent("chat-8", "@_user_1 写教案"), rt);
     await vi.waitFor(async () => {
@@ -287,8 +342,19 @@ describe("trigger full lifecycle (integration)", () => {
       expect(runs[0]?.status).toBe("COMPLETED");
     });
 
+    const queuedEvent = makeEvent("chat-8", "@_user_1 后续需求");
+    queue.enqueue("proj-8", {
+      chatId: "chat-8",
+      prompt: extractPrompt(queuedEvent.message) ?? "后续需求",
+      msg: queuedEvent.message,
+      senderOpenId: "ou_test_user",
+      actor: { feishuOpenId: "ou_test_user", chatId: "chat-8" },
+    });
+    expect(queue.length("proj-8")).toBe(1);
+
     await trigger(makeEvent("chat-8", "@_user_1 /reset"), rt);
     expect(rt.sentTexts).toContain("已重置,下次 @bot 将从头开始。");
+    expect(queue.length("proj-8")).toBe(0);
 
     const sessions = await prisma.agentSession.findMany();
     expect(sessions).toHaveLength(1);
@@ -490,6 +556,32 @@ describe("trigger full lifecycle (integration)", () => {
   });
 });
 
+interface Deferred<T> {
+  readonly promise: Promise<T>;
+  readonly resolve: (value: T) => void;
+  readonly reject: (reason?: unknown) => void;
+}
+
+function deferred<T>(): Deferred<T> {
+  let resolve!: (value: T) => void;
+  let reject!: (reason?: unknown) => void;
+  const promise = new Promise<T>((res, rej) => {
+    resolve = res;
+    reject = rej;
+  });
+  return { promise, resolve, reject };
+}
+
+function completedRunResult(text: string, sdkSessionId: string): RunResult {
+  return {
+    status: "completed",
+    text,
+    usage: { inputTokens: 10, outputTokens: 5 },
+    numTurns: 1,
+    sdkSessionId,
+  };
+}
+
 afterAll(async () => {
   await prisma.$disconnect();
 });

hub/test/unit/trigger-queue.test.ts

@@ -0,0 +1,135 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { TriggerQueue, type QueuedTrigger } from "../../src/feishu/triggerQueue.js";
+import type { MessageReceiveEvent } from "../../src/feishu/client.js";
+
+describe("TriggerQueue", () => {
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  it("dequeues triggers in FIFO order", () => {
+    const queue = new TriggerQueue();
+
+    queue.enqueue("project-1", makeTrigger("first"));
+    queue.enqueue("project-1", makeTrigger("second"));
+
+    expect(queue.dequeue("project-1")?.prompt).toBe("first");
+    expect(queue.dequeue("project-1")?.prompt).toBe("second");
+  });
+
+  it("returns the 1-based queue position from enqueue", () => {
+    const queue = new TriggerQueue();
+
+    expect(queue.enqueue("project-1", makeTrigger("first"))).toBe(1);
+    expect(queue.enqueue("project-1", makeTrigger("second"))).toBe(2);
+    expect(queue.enqueue("project-1", makeTrigger("third"))).toBe(3);
+  });
+
+  it("returns 0 when the project queue is full", () => {
+    const queue = new TriggerQueue({ maxQueueSize: 2 });
+
+    expect(queue.enqueue("project-1", makeTrigger("first"))).toBe(1);
+    expect(queue.enqueue("project-1", makeTrigger("second"))).toBe(2);
+    expect(queue.enqueue("project-1", makeTrigger("third"))).toBe(0);
+    expect(queue.length("project-1")).toBe(2);
+  });
+
+  it("returns null when dequeueing an empty queue", () => {
+    const queue = new TriggerQueue();
+
+    expect(queue.dequeue("project-1")).toBeNull();
+  });
+
+  it("peeks without removing the trigger", () => {
+    const queue = new TriggerQueue();
+
+    queue.enqueue("project-1", makeTrigger("first"));
+
+    expect(queue.peek("project-1")?.prompt).toBe("first");
+    expect(queue.length("project-1")).toBe(1);
+    expect(queue.dequeue("project-1")?.prompt).toBe("first");
+  });
+
+  it("reports length and pending state per project", () => {
+    const queue = new TriggerQueue();
+
+    expect(queue.length("project-1")).toBe(0);
+    expect(queue.hasPending("project-1")).toBe(false);
+
+    queue.enqueue("project-1", makeTrigger("first"));
+
+    expect(queue.length("project-1")).toBe(1);
+    expect(queue.hasPending("project-1")).toBe(true);
+  });
+
+  it("purges expired triggers", () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(1_000);
+    const queue = new TriggerQueue({ maxWaitMs: 100 });
+
+    queue.enqueue("project-1", makeTrigger("old"));
+    vi.setSystemTime(1_050);
+    queue.enqueue("project-1", makeTrigger("fresh"));
+    vi.setSystemTime(1_101);
+
+    expect(queue.purgeExpired()).toBe(1);
+    expect(queue.length("project-1")).toBe(1);
+    expect(queue.dequeue("project-1")?.prompt).toBe("fresh");
+  });
+
+  it("clears all triggers for a project", () => {
+    const queue = new TriggerQueue();
+
+    queue.enqueue("project-1", makeTrigger("first"));
+    queue.enqueue("project-1", makeTrigger("second"));
+    queue.enqueue("project-2", makeTrigger("other"));
+
+    expect(queue.clear("project-1")).toBe(2);
+    expect(queue.length("project-1")).toBe(0);
+    expect(queue.length("project-2")).toBe(1);
+  });
+
+  it("clears all project queues", () => {
+    const queue = new TriggerQueue();
+
+    queue.enqueue("project-1", makeTrigger("first"));
+    queue.enqueue("project-2", makeTrigger("other"));
+    queue.clearAll();
+
+    expect(queue.hasPending("project-1")).toBe(false);
+    expect(queue.hasPending("project-2")).toBe(false);
+  });
+
+  it("keeps multiple project queues independent", () => {
+    const queue = new TriggerQueue();
+
+    expect(queue.enqueue("project-1", makeTrigger("p1-first"))).toBe(1);
+    expect(queue.enqueue("project-2", makeTrigger("p2-first"))).toBe(1);
+    expect(queue.enqueue("project-1", makeTrigger("p1-second"))).toBe(2);
+
+    expect(queue.dequeue("project-2")?.prompt).toBe("p2-first");
+    expect(queue.dequeue("project-1")?.prompt).toBe("p1-first");
+    expect(queue.dequeue("project-1")?.prompt).toBe("p1-second");
+  });
+});
+
+function makeTrigger(prompt: string): Omit<QueuedTrigger, "projectId" | "enqueuedAt"> {
+  return {
+    chatId: "chat-1",
+    prompt,
+    msg: makeMessage(prompt),
+    senderOpenId: "ou-user",
+    actor: { feishuOpenId: "ou-user", chatId: "chat-1" },
+  };
+}
+
+function makeMessage(prompt: string): MessageReceiveEvent["message"] {
+  return {
+    message_id: `message-${prompt}`,
+    chat_id: "chat-1",
+    chat_type: "group",
+    message_type: "text",
+    content: JSON.stringify({ text: `@_user_1 ${prompt}` }),
+    mentions: [{ key: "@_user_1", id: { open_id: "ou-bot" }, name: "Bot" }],
+  };
+}