diff --git a/apps/ai-game-creator-shell/scripts/build-release.mjs b/apps/ai-game-creator-shell/scripts/build-release.mjs
index 4459fbe92..fc4bbc8f4 100644
--- a/apps/ai-game-creator-shell/scripts/build-release.mjs
+++ b/apps/ai-game-creator-shell/scripts/build-release.mjs
@@ -211,10 +211,18 @@ export async function resolvePreviousReleaseCommit(
   if (explicit && /^[0-9a-f]{7,40}$/u.test(explicit)) {
     return explicit;
   }
-  const manifest = await readRemoteChannelManifest(channel);
-  const commit =
-    typeof manifest?.commit === 'string' ? manifest.commit.trim() : '';
-  return /^[0-9a-f]{7,40}$/u.test(commit) ? commit : null;
+  try {
+    const manifest = await readRemoteChannelManifest(channel);
+    const commit =
+      typeof manifest?.commit === 'string' ? manifest.commit.trim() : '';
+    return /^[0-9a-f]{7,40}$/u.test(commit) ? commit : null;
+  } catch (error) {
+    // 摘要只是附注：清单读不到（网络抖动等）不能把发布带崩，降级为「没有锚点」。
+    console.warn(
+      `[ai-game-creator-shell] 读取摘要锚点失败，本次不写自动摘要：${error.message}`,
+    );
+    return null;
+  }
 }
 
 /**
@@ -546,6 +554,39 @@ export function formatReleaseNotes(
   return text.length > maxLength ? `${text.slice(0, maxLength - 1)}…` : text;
 }
 
+/** 无锚点时的兜底：列出最近的客户端相关提交，并注明可能与上一版重复。 */
+export function collectRecentReleaseCommits({
+  cwd = repoRoot,
+  paths = agcReleasePathPatterns,
+  limit = 8,
+} = {}) {
+  let output;
+  try {
+    output = execFileSync(
+      'git',
+      ['log', '--no-merges', `-n${limit}`, '--format=%h%x09%s', '--', ...paths],
+      { cwd, encoding: 'utf8' },
+    );
+  } catch {
+    return null;
+  }
+  const commits = output
+    .split(/\r?\n/u)
+    .map((line) => line.trim())
+    .filter(Boolean)
+    .map((line) => {
+      const [sha = '', ...subject] = line.split('\t');
+      return { sha, subject: subject.join('\t') };
+    });
+  return commits.length > 0 ? commits : null;
+}
+
+export function formatRecentReleaseNotes(commits) {
+  const notes = formatReleaseNotes(commits, { limit: 8 });
+  if (!notes) return '';
+  return `最近客户端改动（未定位到上一次发布提交，可能与上一版重复）：\n${notes}`;
+}
+
 /** 旧协议（sha256）清单：只用于把已发布客户端带到新渠道协议，一个版本周期后整条删除。 */
 export function createLegacyUpdateManifest(
   artifactPath,
@@ -572,10 +613,14 @@ export async function generateUpdateManifest() {
   const manualNotes = readReleaseNotes();
   const previousCommit = await resolvePreviousReleaseCommit(channel);
   const commits = collectReleaseCommits(previousCommit);
-  const notes = manualNotes || formatReleaseNotes(commits);
+  const recentCommits = previousCommit ? null : collectRecentReleaseCommits();
+  const notes =
+    manualNotes ||
+    formatReleaseNotes(commits) ||
+    formatRecentReleaseNotes(recentCommits);
   if (!manualNotes && !notes) {
     console.log(
-      `[ai-game-creator-shell] 未生成自动更新摘要（上一发布 commit=${previousCommit ?? '未知'}，客户端相关提交=${commits ? commits.length : '不可判定'}）`,
+      `[ai-game-creator-shell] 未生成自动更新摘要（上一发布 commit=${previousCommit ?? '未知'}，客户端相关提交=${commits ? commits.length : '不可判定'}，最近提交=${recentCommits ? recentCommits.length : '不可判定'}）`,
     );
   }
   const manifest = createUpdateManifest(artifact, { channel, notes });
@@ -606,7 +651,9 @@ export async function generateUpdateManifest() {
   console.log(
     manualNotes
       ? '[ai-game-creator-shell] 更新摘要：使用 AGC_UPDATE_RELEASE_NOTES 手动文案'
-      : `[ai-game-creator-shell] 更新摘要：自动汇总 ${commits ? commits.length : 0} 条客户端相关提交（起点 ${previousCommit ?? '无'}）`,
+      : notes && !previousCommit
+        ? `[ai-game-creator-shell] 更新摘要：无锚点，列出最近 ${recentCommits ? recentCommits.length : 0} 条客户端相关提交`
+        : `[ai-game-creator-shell] 更新摘要：自动汇总 ${commits ? commits.length : 0} 条客户端相关提交（起点 ${previousCommit ?? '无'}）`,
   );
   console.log(`[ai-game-creator-shell] 更新摘要文件：${notesPath}`);
   if (legacyManifestPath) {
diff --git a/apps/ai-game-creator-shell/scripts/build-release.test.mjs b/apps/ai-game-creator-shell/scripts/build-release.test.mjs
index eb583e380..de0134267 100644
--- a/apps/ai-game-creator-shell/scripts/build-release.test.mjs
+++ b/apps/ai-game-creator-shell/scripts/build-release.test.mjs
@@ -14,11 +14,13 @@ import { fileURLToPath } from 'node:url';
 
 import {
   agcReleasePathPatterns,
+  collectRecentReleaseCommits,
   collectReleaseCommits,
   compareVersions,
   createChannelConfig,
   createLegacyUpdateManifest,
   createUpdateManifest,
+  formatRecentReleaseNotes,
   formatReleaseNotes,
   nextPatchVersion,
   resolveManifestPlatformKeys,
@@ -277,6 +279,61 @@ test('release notes anchor prefers the explicit commit and falls back to the man
   );
 });
 
+test('release notes anchor degrades to null when the manifest cannot be read', async () => {
+  const originalFetch = globalThis.fetch;
+  globalThis.fetch = async () => {
+    throw new Error('fetch failed');
+  };
+  try {
+    assert.equal(
+      await resolvePreviousReleaseCommit('dev-win', { override: undefined }),
+      null,
+    );
+  } finally {
+    globalThis.fetch = originalFetch;
+  }
+});
+
+test('recent commit fallback marks that entries may repeat the previous release', () => {
+  const directory = mkdtempSync(path.join(os.tmpdir(), 'agc-recent-git-'));
+  const git = (...args) =>
+    execFileSync('git', args, { cwd: directory, encoding: 'utf8' });
+  try {
+    git('init', '--quiet');
+    git('config', 'user.email', 'release@example.test');
+    git('config', 'user.name', 'release test');
+    mkdirSync(path.join(directory, 'apps/ai-game-creator-shell'), {
+      recursive: true,
+    });
+    for (const name of ['one', 'two']) {
+      writeFileSync(
+        path.join(directory, `apps/ai-game-creator-shell/${name}.rs`),
+        `fn ${name}() {}\n`,
+      );
+      git('add', '.');
+      git('commit', '--quiet', '-m', `客户端：${name}`);
+    }
+    writeFileSync(path.join(directory, 'README.md'), '# 文档\n');
+    git('add', '.');
+    git('commit', '--quiet', '-m', '文档：说明');
+
+    const recent = collectRecentReleaseCommits({ cwd: directory, limit: 5 });
+    assert.deepEqual(
+      recent.map((entry) => entry.subject),
+      ['客户端：two', '客户端：one'],
+    );
+    const notes = formatRecentReleaseNotes(recent);
+    assert.match(
+      notes,
+      /^最近客户端改动（未定位到上一次发布提交，可能与上一版重复）：\n- 客户端：two/u,
+    );
+    assert.equal(formatRecentReleaseNotes([]), '');
+    assert.equal(formatRecentReleaseNotes(null), '');
+  } finally {
+    rmSync(directory, { recursive: true, force: true });
+  }
+});
+
 test('release upload forces overwrite for artifact, signature and channel pointers', () => {
   const source = readFileSync(
     new URL('./release-upload.mjs', import.meta.url),
diff --git a/docs/technical/【技术方案】AGC客户端更新检查与下载-2026-08-31.md b/docs/technical/【技术方案】AGC客户端更新检查与下载-2026-08-31.md
index 3c7201a22..97c7474ea 100644
--- a/docs/technical/【技术方案】AGC客户端更新检查与下载-2026-08-31.md
+++ b/docs/technical/【技术方案】AGC客户端更新检查与下载-2026-08-31.md
@@ -92,7 +92,7 @@
 - 发布入口：`npm run ai-game-creator-shell:release:upload`（构建 + 按渠道上传）；仅构建不发布的 smoke 使用 `--no-bundle` 分支，不读远端版本、不改版本、不生成清单。
 - 渠道由构建参数显式指定，并按目标平台校验：Windows 目标只允许 `dev-win`，macOS 目标只允许 `dev-mac`；未显式指定时按目标平台取默认渠道。
 - 定时调度只在本轮到达的提交包含 AGC 相关路径（客户端、共享包、`server-rs/crates`、AGC 插件、桌面壳图标、根依赖清单）时才触发渠道发布；纯文档或流水线自身的提交只跑 Full Build，不推高客户端版本号。判定失败或勾选强制触发时按"需要发布"处理。
-- 更新摘要自动生成：发布脚本用渠道清单里的 `commit` 字段（上一次发布的提交）到本次提交之间、且只覆盖客户端相关路径的提交列表生成 `notes`（每条 `- 提交标题（短 SHA）`，最多 12 条、主题 80 字、整体 900 字，超出折叠或截断），同时写入旧协议清单的 `releaseNotes` 和归档文件 `release-notes.txt`。`AGC_UPDATE_RELEASE_NOTES` 非空时以手动文案为准；无法判定起点（缺少上次 `commit` 或本地没有该提交）时不写摘要。清单缺少 `commit` 时回退用上一次成功构建的 `COMMIT_HASH`（CI 通过 `AGC_UPDATE_PREVIOUS_COMMIT` 传入）作为锚点，因此首次启用摘要或更换渠道后也能立即产出摘要。
+- 更新摘要自动生成：发布脚本用渠道清单里的 `commit` 字段（上一次发布的提交）到本次提交之间、且只覆盖客户端相关路径的提交列表生成 `notes`（每条 `- 提交标题（短 SHA）`，最多 12 条、主题 80 字、整体 900 字，超出折叠或截断），同时写入旧协议清单的 `releaseNotes` 和归档文件 `release-notes.txt`。`AGC_UPDATE_RELEASE_NOTES` 非空时以手动文案为准；无法判定起点（缺少上次 `commit` 或本地没有该提交）时不写摘要。清单缺少 `commit` 时回退用上一次成功构建的 `COMMIT_HASH`（CI 通过 `AGC_UPDATE_PREVIOUS_COMMIT` 传入）作为锚点，因此首次启用摘要或更换渠道后也能立即产出摘要。锚点仍不可得（清单读取失败或没有 CI 锚点）时降级为「最近客户端改动」列表并注明可能与上一版重复 —— 摘要属于附注，任何情况下都不允许因为它让发布失败。
 - 清单里的 `commit` 是非标准字段：更新插件忽略未知字段，发布脚本用它定位下一次摘要的起点。
 - 上传：安装包与 `.sig` 上传到 `agc/<channel>/<version>/`，清单以 `--force` 覆盖上传到 `agc/<channel>/latest.json`，保证 latest 指针与清单内 URL 指向已存在的对象。
 - Jenkins 流水线需要新增渠道参数与签名凭据；签名私钥与密码只以受保护凭据注入当前进程，不写入 workspace、日志或归档产物。