diff --git a/Agent.md b/Agent.md
index 862a4b0c..e99143ca 100644
--- a/Agent.md
+++ b/Agent.md
@@ -85,7 +85,7 @@ Usage: say "tool loop" for the whole process, "round N" for a single LLM request
   - Streaming chat with delta rendering (16ms batching), markdown on done (marked + DOMPurify + local highlight.js subset), tool call status cards (2000-char truncation + expand)
   - Session list/switch/new/delete + right-click rename (context menu, #423) synced with daemon; own-stream busy lock (G65); broadcast streams from other clients tagged "来自其他客户端"
   - Disconnect/reconnect: red status dot, auto daemon respawn (stale-port detection), session resume, input bar restored on disconnect (no 30s fake-timeout)
-  - Unit tests `npm test` (253: 45 daemon_client + 19 conn-manager + 22 app-commands + 126 renderer smoke + 16 i18n + 7 integration + 3 commands + 6 build-config + 7 gui-state + 2 tool-group); RESPONSE_TYPES mirror daemon protocol verified against `daemon.py`
+  - Unit tests `npm test` (255: 45 daemon_client + 19 conn-manager + 22 app-commands + 127 renderer smoke + 16 i18n + 7 integration + 3 commands + 7 build-config + 7 gui-state + 2 tool-group); RESPONSE_TYPES mirror daemon protocol verified against `daemon.py`
 - **Scheduled tasks** — Task generalization + CRUD (rant 2026-08-12T18:23:15, #709/#710/#711)
   - Task handler generalized: `TaskHandler` (renamed from `EvolutionHandler`), repo-configured self-heal for any project, template lookup builtin → `~/.emrg/task-templates/<name>.md` → fallback
   - Daemon commands: `task_create/update/delete` + `task_template_create/list/update/delete` (tasks stored in `~/.emrg/tasks.yml`, custom type templates in `~/.emrg/task-templates/`)
@@ -119,7 +119,7 @@ pkill -f "emrg.server"; rm -f ~/.emrg/emrgd.port; python -m emrg
 ```
 
 Python: `uv run pytest tests/ -v` (825) — import check: `uv run python -c "from emrg.client.app import run_client"`
-GUI: `cd emrg/gui && npm test` (253: 45 daemon_client + 19 conn-manager + 22 app-commands + 126 renderer smoke + 16 i18n + 7 integration + 3 commands + 6 build-config + 7 gui-state + 2 tool-group) — syntax: `node --check main.js preload.js daemon_client.js renderer/js/*.js`
+GUI: `cd emrg/gui && npm test` (255: 45 daemon_client + 19 conn-manager + 22 app-commands + 127 renderer smoke + 16 i18n + 7 integration + 3 commands + 7 build-config + 7 gui-state + 2 tool-group) — syntax: `node --check main.js preload.js daemon_client.js renderer/js/*.js`
 CI: `uv run pytest` (ubuntu + **windows-2025 matrix** — Windows pytest 回归在 PR CI 即失败，v0.2.29 教训 #725) + GUI tests + **actionlint workflow lint** (`rhysd/actionlint@v1.7.12` gate, #444 — workflow 解析错误在 PR CI 即失败，如 `if:` secrets 上下文)
 Re-trigger: `scripts/re-trigger-ci.sh [branch]` (workflow_dispatch, #527 — 替代空 commit 重触发：Actions outage 会整段丢弃 push 事件，dispatch 走 API 路径不受影响)
 
diff --git a/emrg/gui/renderer/index.html b/emrg/gui/renderer/index.html
index cbbfc7e1..8706ebf4 100644
--- a/emrg/gui/renderer/index.html
+++ b/emrg/gui/renderer/index.html
@@ -387,6 +387,10 @@ <h2 data-i18n="rename.title">重命名对话</h2>
   <!-- 右键菜单（对话列表：重命名 / 删除） -->
   <div id="ctx-menu" class="ctx-menu" hidden></div>
 
+  <!-- rant 2026-08-15T10:48:58: marked/dompurify/highlight MUST load BEFORE monaco loader.js — loader.js defines global AMD define/require (L1347 u.global.define=p); UMD marked sees AMD -> define branch -> window.marked never set -> chat/rant markdown degrades to plain text. UMD-first order fixes it (no AMD present -> UMD branch). -->
+  <script src="../vendor/marked.min.js"></script>
+  <script src="../vendor/dompurify.min.js"></script>
+  <script src="../vendor/highlight.custom.js"></script>
   <script src="../vendor/monaco/vs/loader.js"></script>
   <script>
     // Monaco (local vendor, zero network; rant 2026-08-15T09:20:12 option A).
@@ -400,9 +404,6 @@ <h2 data-i18n="rename.title">重命名对话</h2>
       }
     };
   </script>
-  <script src="../vendor/marked.min.js"></script>
-  <script src="../vendor/dompurify.min.js"></script>
-  <script src="../vendor/highlight.custom.js"></script>
   <!-- 帮助对话框（/help，GUI / 指令 P1） -->
   <dialog id="help-dialog">
     <div class="dialog-card" style="min-width:420px;">
diff --git a/emrg/gui/renderer/js/markdown.js b/emrg/gui/renderer/js/markdown.js
index c38fb968..d1d99cab 100644
--- a/emrg/gui/renderer/js/markdown.js
+++ b/emrg/gui/renderer/js/markdown.js
@@ -45,10 +45,33 @@ function ensureConfigured() {
   window.__emrgMarkedConfigured = true;
 }
 
+/** AMD-hijack recovery (rant 2026-08-15T10:48:58) — fallback layer:
+ *  monaco loader 的全局 AMD define 会让 UMD marked/dompurify 走 define 分支而非挂 window；
+ *  顺序修复（index.html marked 先于 loader.js）后正常路径不触发，此处兜底 + 可诊断。 */
+function recoverAmdModule(name) {
+  try {
+    // monaco loader 的 require 内部模块表: require.s[name] = { exports }
+    if (window.require && window.require.s && window.require.s[name]) {
+      const mod = window.require.s[name].exports;
+      if (mod) return mod;
+    }
+    // 部分打包器形态: define.amd.modules
+    if (window.define && window.define.amd && window.define.amd.modules && window.define.amd.modules[name]) {
+      return window.define.amd.modules[name].exports;
+    }
+  } catch { /* ignore */ }
+  return null;
+}
+
 renderer.renderMarkdown = async function (mdText) {
   if (!window.marked) {
-    console.warn("markdown vendor missing (marked not loaded)");
-    return escapeHtml(mdText || "");
+    const amdMarked = recoverAmdModule("marked");
+    if (amdMarked && typeof amdMarked.parse === "function") {
+      window.marked = amdMarked; // 兜底取回：AMD 劫持场景仍可渲染
+    } else {
+      console.error("markdown vendor missing (marked not loaded — check index.html order: marked must load before monaco loader.js, which defines global AMD define/require)");
+      return escapeHtml(mdText || "");
+    }
   }
   try {
     ensureConfigured();
diff --git a/emrg/gui/test/build-config.test.js b/emrg/gui/test/build-config.test.js
index 2798aa03..0be335ad 100644
--- a/emrg/gui/test/build-config.test.js
+++ b/emrg/gui/test/build-config.test.js
@@ -68,13 +68,35 @@ test("vendor ships Monaco editor (loader + editor.main js/css)", () => {
   }
 });
 
-test("renderMarkdown fallback logs when marked is missing", () => {
+test("renderMarkdown fallback logs when marked is missing (AMD-hijack diagnostic)", () => {
   const md = fs.readFileSync(path.join(GUI_ROOT, "renderer", "js", "markdown.js"), "utf-8");
   assert.match(
     md,
-    /if \(!window\.marked\) \{[\s\S]*console\.warn\("markdown vendor missing \(marked not loaded\)"\)/,
-    "silent markdown degradation must be diagnostic (console.warn when marked is missing)"
+    /if \(!window\.marked\) \{[\s\S]*console\.error\("markdown vendor missing \(marked not loaded/,
+    "silent markdown degradation must be diagnostic (console.error naming the AMD-hijack cause when marked is missing)"
   );
+  assert.match(
+    md,
+    /recoverAmdModule\("marked"\)/,
+    "must attempt AMD module-table recovery before degrading (rant 2026-08-15T10:48:58)"
+  );
+});
+
+test("index.html loads marked/dompurify/highlight BEFORE monaco loader.js (AMD-hijack order guard)", () => {
+  // rant 2026-08-15T10:48:58：monaco/vs/loader.js 定义全局 AMD define/require；
+  // UMD marked 见 AMD 走 define 分支 → window.marked 永不设置 → markdown 全退化纯文本。
+  // 顺序修复 = marked 等 UMD 库必须先于 loader.js 加载（无 AMD → UMD 分支挂 window）。
+  const html = fs.readFileSync(path.join(GUI_ROOT, "renderer", "index.html"), "utf-8");
+  const idxMarked = html.indexOf('src="../vendor/marked.min.js"');
+  const idxDompurify = html.indexOf('src="../vendor/dompurify.min.js"');
+  const idxHighlight = html.indexOf('src="../vendor/highlight.custom.js"');
+  const idxMonaco = html.indexOf('src="../vendor/monaco/vs/loader.js"');
+  for (const [name, idx] of [["marked", idxMarked], ["dompurify", idxDompurify], ["highlight", idxHighlight], ["monaco loader", idxMonaco]]) {
+    assert.ok(idx >= 0, `index.html must include ${name} script`);
+  }
+  assert.ok(idxMarked < idxMonaco, "marked.min.js must load BEFORE monaco loader.js (else AMD define hijacks UMD marked)");
+  assert.ok(idxDompurify < idxMonaco, "dompurify.min.js must load BEFORE monaco loader.js");
+  assert.ok(idxHighlight < idxMonaco, "highlight.custom.js must load BEFORE monaco loader.js");
 });
 
 test("every main.js/preload.js local require is covered by files whitelist", () => {
diff --git a/emrg/gui/test/renderer.smoke.test.js b/emrg/gui/test/renderer.smoke.test.js
index 642b50ad..c3b47ea8 100644
--- a/emrg/gui/test/renderer.smoke.test.js
+++ b/emrg/gui/test/renderer.smoke.test.js
@@ -824,6 +824,28 @@ test("代码块复制按钮：codeRenderer 输出容器 + 点击复制（设计
   assert.ok(chatSrc.includes(".code-copy"), "chat.js 应含复制按钮事件委托");
 });
 
+test("rant 10:48:58：window.marked 缺失时从 Monaco AMD 模块表兜底取回（防退化纯文本）", async () => {
+  const { ctx, win } = makeSandbox({});
+  // 模拟 #801 Monaco 全局 AMD define 劫持后 marked 未挂 window 的场景：
+  // window.marked = null（沙箱默认），但 monaco require 模块表里有 marked
+  win.marked = undefined; // 强制缺失（沙箱默认 null → 触发兜底路径）
+  win.require = {
+    s: {
+      marked: { exports: { use: () => {}, parse: async () => "<p><strong>ok</strong></p>" } },
+    },
+  };
+  win.DOMPurify = { sanitize: (x) => x };
+  const html = await vm.runInContext('window.emrgMarkdown.renderMarkdown("**ok**")', ctx);
+  assert.ok(String(html).includes("<strong>ok</strong>"), `AMD 兜底应渲染 marked：${html}`);
+  assert.ok(win.marked && typeof win.marked.parse === "function", "兜底取回后 window.marked 应被赋值");
+  // 无 AMD 表也无 marked → 降级转义 + 可诊断错误（不崩）
+  const { ctx: ctx2, win: win2 } = makeSandbox({});
+  win2.marked = undefined;
+  win2.require = undefined;
+  const html2 = await vm.runInContext('window.emrgMarkdown.renderMarkdown("<b>x</b>")', ctx2);
+  assert.strictEqual(html2, "&lt;b&gt;x&lt;/b&gt;", "双缺失 → escapeHtml 降级");
+});
+
 test("模型切换器：菜单项构建 + 键盘导航 handler 注册", async () => {
   const { ctx } = makeSandbox({
     getSettings: async () => ({