diff --git a/apps/ai-game-creator-shell/scripts/start-dev-stack.mjs b/apps/ai-game-creator-shell/scripts/start-dev-stack.mjs
index 968c8927e..4a5bc81b6 100644
--- a/apps/ai-game-creator-shell/scripts/start-dev-stack.mjs
+++ b/apps/ai-game-creator-shell/scripts/start-dev-stack.mjs
@@ -127,6 +127,39 @@ function readBackendTargets({ requireAgcBackend = false } = {}) {
   });
 }
 
+function readBackendServiceFailure(
+  state,
+  {
+    expectedDatabase = backendDatabase,
+    expectedSpacetimeDataDir = backendSpacetimeDataDir,
+  } = {},
+) {
+  const targets = resolveBackendTargetsFromState(state, {
+    requireAgcBackend: true,
+    expectedDatabase,
+    expectedSpacetimeDataDir,
+  });
+  if (!targets.hasMatchingBackend) {
+    return null;
+  }
+
+  for (const serviceName of ['spacetime', 'api-server', 'bgfilter-worker']) {
+    const service = state?.services?.[serviceName];
+    if (service?.status !== 'failed') {
+      continue;
+    }
+
+    return {
+      serviceName,
+      failure: service.signal
+        ? `signal=${service.signal}`
+        : `code=${service.exitCode ?? 1}`,
+    };
+  }
+
+  return null;
+}
+
 async function isBackendReady({
   state = readJson(devStackStatePath),
   isReady = isHttpReady,
@@ -505,11 +538,29 @@ async function terminateChildTree(
   return { stopped, forced: true };
 }
 
-async function waitForBackendReady(backendChild, timeoutMs = 600_000) {
+async function waitForBackendReady(
+  backendChild,
+  timeoutMs = 600_000,
+  {
+    checkBackendReady = isBackendReady,
+    readState = () => readJson(devStackStatePath),
+    resolveTargets = readBackendTargets,
+  } = {},
+) {
+  const initialStateUpdatedAt = readState()?.updatedAt ?? '';
   const startedAt = Date.now();
   while (Date.now() - startedAt < timeoutMs) {
-    if (await isBackendReady()) {
-      return readBackendTargets();
+    if (await checkBackendReady()) {
+      return resolveTargets();
+    }
+    const state = readState();
+    if ((state?.updatedAt ?? '') !== initialStateUpdatedAt) {
+      const serviceFailure = readBackendServiceFailure(state);
+      if (serviceFailure) {
+        throw new Error(
+          `配套后端启动失败: ${serviceFailure.serviceName} ${serviceFailure.failure}`,
+        );
+      }
     }
     const failure = readChildFailure(backendChild);
     if (failure) {
@@ -684,6 +735,7 @@ export {
   isDirectModuleExecution,
   isProcessGroupAlive,
   preflightExistingVite,
+  readBackendServiceFailure,
   readChildFailure,
   readLinuxProcessGroupAlive,
   resolveBackendTargetsFromState,
diff --git a/apps/ai-game-creator-shell/tests/start-dev-stack.test.ts b/apps/ai-game-creator-shell/tests/start-dev-stack.test.ts
index d9130a640..4418da177 100644
--- a/apps/ai-game-creator-shell/tests/start-dev-stack.test.ts
+++ b/apps/ai-game-creator-shell/tests/start-dev-stack.test.ts
@@ -10,12 +10,14 @@ import {
   isBackendReady,
   isProcessGroupAlive,
   preflightExistingVite,
+  readBackendServiceFailure,
   readLinuxProcessGroupAlive,
   resolveBackendTargetsFromState,
   runWindowsTaskkill,
   spawnChild,
   stopChild,
   terminateChildTree,
+  waitForBackendReady,
   waitForChildTermination,
 } from '../scripts/start-dev-stack.mjs';
 
@@ -26,6 +28,7 @@ function backendState(spacetimeDataDir?: string, includeBgfilterWorker = true) {
   return {
     schemaVersion: spacetimeDataDir ? 2 : 1,
     database: expectedDatabase,
+    updatedAt: '',
     ...(spacetimeDataDir ? { spacetimeDataDir } : {}),
     services: {
       'api-server': {
@@ -127,6 +130,47 @@ describe('AI 游戏创作配套后端复用门禁', () => {
       }),
     ).resolves.toBe(true);
   });
+
+  test('后端服务失败时返回具体失败服务，避免外层无限等待', () => {
+    const state = backendState(expectedDataDir);
+    state.services['bgfilter-worker'].status = 'failed';
+    state.services['bgfilter-worker'].exitCode = 1;
+    state.services['bgfilter-worker'].signal = null;
+
+    expect(readBackendServiceFailure(state)).toEqual({
+      serviceName: 'bgfilter-worker',
+      failure: 'code=1',
+    });
+  });
+
+  test('不匹配的旧状态失败记录不会阻断当前后端启动', () => {
+    const state = backendState(resolve('server-rs/.spacetimedb/other/data'));
+    state.services['bgfilter-worker'].status = 'failed';
+    state.services['bgfilter-worker'].exitCode = 1;
+
+    expect(readBackendServiceFailure(state)).toBeNull();
+  });
+
+  test('等待后端时立即传播状态文件中的服务失败', async () => {
+    const initialState = backendState(expectedDataDir);
+    initialState.updatedAt = '2026-09-04T08:00:00.000Z';
+    const state = backendState(expectedDataDir);
+    state.updatedAt = '2026-09-04T08:00:01.000Z';
+    state.services['bgfilter-worker'].status = 'failed';
+    state.services['bgfilter-worker'].exitCode = 98;
+    const child = Object.assign(new EventEmitter(), {
+      exitCode: null,
+      signalCode: null,
+    });
+    let readCount = 0;
+
+    await expect(
+      waitForBackendReady(child, 100, {
+        checkBackendReady: async () => false,
+        readState: () => (readCount++ === 0 ? initialState : state),
+      }),
+    ).rejects.toThrow('配套后端启动失败: bgfilter-worker code=98');
+  });
 });
 
 describe('AI 游戏创作启动子进程生命周期', () => {
diff --git a/docs/【开发运维】本地开发验证与生产运维-2026-05-15.md b/docs/【开发运维】本地开发验证与生产运维-2026-05-15.md
index 944fa7356..a86648451 100644
--- a/docs/【开发运维】本地开发验证与生产运维-2026-05-15.md
+++ b/docs/【开发运维】本地开发验证与生产运维-2026-05-15.md
@@ -58,7 +58,7 @@ Linux 本机多用户并发开发时，`npm run dev`、`npm run dev:*` 单模块
 
 后端日志默认写入 `logs/api-server/`，独立 BgFilter worker 日志默认写入 `logs/bgfilter-worker/`。后端 API smoke 使用 `npm run dev:api-server`，先检查 BgFilter worker `/readyz`，再检查 API `/healthz`；需要确认 API 实例可接生产流量时检查 API `/readyz`。不要使用旧 `api-server:maincloud` 或任何 `GENARRATIVE_SPACETIME_MAINCLOUD_*` 口径。
 
-AI 游戏创作客户端使用 `npm run agc`。该入口由 `apps/ai-game-creator-shell/scripts/start-tauri-dev.mjs` 解析 AGC Vite 实际端口：Linux 默认取当前用户端口段的 `start + 5`，占用时只在本用户段内漂移；Windows / macOS 保留 `3080` 为兼容首选并允许统一漂移。最终端口通过 `GENARRATIVE_AGC_VITE_PORT` 传给 `beforeDevCommand` 和配套后端端口解析器，通过 Tauri CLI 动态 `build.devUrl` 配置传给 WebView，并通过 Vite CLI `--port` 启动严格监听；Vite 继续使用 `strictPort`，任何一层都不得自行改到另一个端口。AGC 配套后端的 `backend` 模式启动 SpacetimeDB、独立 `bgfilter-worker` 和 `api-server`，并在复用现有后端前同时检查三者状态及 `/v1/ping`、`/readyz`、`/healthz`；worker 缺失时不得把不完整的 API/数据库组合误判为 ready。启动器在创建原生窗口前预检最终地址；若竞态中该地址被 AGC Vite、无响应监听器或其它服务占用，一律失败关闭，不复用、也不擅自终止无法证明归属的进程。
+AI 游戏创作客户端使用 `npm run agc`。该入口由 `apps/ai-game-creator-shell/scripts/start-tauri-dev.mjs` 解析 AGC Vite 实际端口：Linux 默认取当前用户端口段的 `start + 5`，占用时只在本用户段内漂移；Windows / macOS 保留 `3080` 为兼容首选并允许统一漂移。最终端口通过 `GENARRATIVE_AGC_VITE_PORT` 传给 `beforeDevCommand` 和配套后端端口解析器，通过 Tauri CLI 动态 `build.devUrl` 配置传给 WebView，并通过 Vite CLI `--port` 启动严格监听；Vite 继续使用 `strictPort`，任何一层都不得自行改到另一个端口。AGC 配套后端的 `backend` 模式启动 SpacetimeDB、独立 `bgfilter-worker` 和 `api-server`，并在复用现有后端前同时检查三者状态及 `/v1/ping`、`/readyz`、`/healthz`；worker 缺失时不得把不完整的 API/数据库组合误判为 ready。任一配套服务在启动阶段进入 `failed` 时，外层启动器必须立即报告具体服务和退出原因，不能继续等待前端地址超时。启动器在创建原生窗口前预检最终地址；若竞态中该地址被 AGC Vite、无响应监听器或其它服务占用，一律失败关闭，不复用、也不擅自终止无法证明归属的进程。
 
 Tauri `beforeDevCommand` 默认与客户端构建并行，不能把上述检查只放在 `beforeDevCommand` 内：选定地址上若已有旧 Vite，Tauri 可能先创建加载旧前端的窗口，随后配套后端才因代理不匹配退出。外层启动器会把 Tauri CLI 放入受控进程树；CLI 正常退出、启动失败或收到终止信号后，POSIX 先向保留的 PGID 发送 `SIGTERM`、有界等待后升级 `SIGKILL`，Windows 使用 `taskkill /PID <pid> /T /F`。Linux 容器中的孤儿后代退出后可能暂时保留为 zombie，`kill(-PGID, 0)` 仍会返回成功；启动器必须结合 `/proc/<pid>/stat` 判断同组是否还存在非 zombie 成员，不能把等待 PID 1 回收误报为清理失败。配套后端和 Vite 仍由 `start-dev-stack.mjs` 各自持有，退出时同样有界收束，避免只剩客户端、Runner、Cargo 或旧订阅进程。排障时同时核对控制台输出的 AGC Vite 实际地址及其 marker、`.app/dev-stack.json` 的实际 API URL 和进程 cwd；不要把“终端已返回”当成客户端及其 Runner 已退出的证据。
 
diff --git a/scripts/dev.mjs b/scripts/dev.mjs
index 0b28a3b17..9b1e91939 100644
--- a/scripts/dev.mjs
+++ b/scripts/dev.mjs
@@ -1433,6 +1433,7 @@ class DevRunner {
 
     if (
       command === 'all' ||
+      command === 'backend' ||
       command === 'api-server' ||
       command === 'bgfilter-worker'
     ) {