diff --git a/apps/desktop-shell/scripts/check-config.mjs b/apps/desktop-shell/scripts/check-config.mjs
index b8bcc3e8d..845913123 100644
--- a/apps/desktop-shell/scripts/check-config.mjs
+++ b/apps/desktop-shell/scripts/check-config.mjs
@@ -1040,6 +1040,14 @@ function extractFunctionBody(source, functionName) {
   throw new Error(`unable to read Rust function body ${functionName}`);
 }
 
+function assertSnippetOrder(source, firstSnippet, secondSnippet, label) {
+  const firstIndex = source.indexOf(firstSnippet);
+  const secondIndex = source.indexOf(secondSnippet);
+  if (firstIndex < 0 || secondIndex < 0 || firstIndex > secondIndex) {
+    throw new Error(`${label} must call ${firstSnippet} before ${secondSnippet}`);
+  }
+}
+
 function extractDesktopDialogFilter(source, ownerName, filterLabel) {
   const ownerBody = extractFunctionBody(source, ownerName);
   const match = ownerBody.match(
@@ -1102,6 +1110,19 @@ function assertDesktopDialogBoundary(method, functionName, filterLabel, expected
   }
 }
 
+function assertDesktopFileExportPayloadOrder(method, functionName, payloadFunction) {
+  const fileFunctionBody = extractFunctionBody(
+    desktopHostBridgeFilesSource,
+    functionName,
+  );
+  assertSnippetOrder(
+    fileFunctionBody,
+    payloadFunction,
+    '.dialog()',
+    `desktop shell ${method} export boundary`,
+  );
+}
+
 function assertNoRawHostContextUrl(urlValue, label) {
   const rawUrl = String(urlValue ?? '');
   const blockedQueryKeys = [
@@ -2555,6 +2576,12 @@ if (
     'desktop shell notification HostBridge method must delegate to notifications module',
   );
 }
+assertSnippetOrder(
+  extractFunctionBody(desktopHostBridgeNotificationsSource, 'show_desktop_local_notification'),
+  'local_notification_payload(request)',
+  'app.notification()',
+  'desktop shell notification boundary',
+);
 for (const snippet of [
   'tauri_plugin_notification::{NotificationExt, PermissionState}',
   'HOST_BRIDGE_LOCAL_NOTIFICATION_DELIVERED_TO_SYSTEM_ACTION',
@@ -2687,6 +2714,21 @@ assertDesktopDialogBoundary(
   ['mp3', 'm4a', 'wav', 'ogg', 'webm'],
   'save',
 );
+assertDesktopFileExportPayloadOrder(
+  'file.exportText',
+  'export_desktop_host_bridge_text_file',
+  'export_text_payload(request)',
+);
+assertDesktopFileExportPayloadOrder(
+  'file.exportImage',
+  'export_desktop_host_bridge_image_file',
+  'export_image_payload(request)',
+);
+assertDesktopFileExportPayloadOrder(
+  'file.exportAudio',
+  'export_desktop_host_bridge_audio_file',
+  'export_audio_payload(request)',
+);
 for (const snippet of [
   '.dialog()',
   'blocking_save_file',
diff --git a/docs/project-memory/shared-memory/decision-log.md b/docs/project-memory/shared-memory/decision-log.md
index 0c0d24e98..9e97b0904 100644
--- a/docs/project-memory/shared-memory/decision-log.md
+++ b/docs/project-memory/shared-memory/decision-log.md
@@ -16,6 +16,14 @@
 
 ---
 
+## 2026-06-20 桌面壳系统能力调用顺序门禁
+
+- 背景：Tauri 桌面壳文件导出和本地通知已经在运行时代码中先校验 HostBridge payload，再打开系统保存对话框、读取通知权限或请求通知权限；如果后续重构把系统能力调用提前，非法请求会触达原生系统边界。
+- 决策：桌面壳单端配置检查必须逐函数反查 `file.exportText`、`file.exportImage`、`file.exportAudio` 先调用对应 payload helper 再进入 `.dialog()`，并反查 `notification.showLocal` 先调用 `local_notification_payload(request)` 再进入 `app.notification()`。文件导入仍以用户主动选择文件后的本地 payload 读取和大小 / MIME 校验为准。
+- 影响范围：`apps/desktop-shell/scripts/check-config.mjs`、`apps/desktop-shell/src-tauri/src/host_bridge/files.rs`、`apps/desktop-shell/src-tauri/src/host_bridge/notifications.rs`。
+- 验证方式：`node apps/desktop-shell/scripts/check-config.mjs`、`npm run check:native-shells`、`npm run check:encoding`、`git diff --check`。
+- 关联文档：`docs/【前端架构】ExpoReactNative与Tauri宿主壳方案-2026-06-17.md`、`docs/【前端架构】宿主壳能力统一协议-2026-06-17.md`。
+
 ## 2026-06-20 原生壳替身词扫描排除构建产物
 
 - 背景：桌面壳单端配置检查会递归扫描生产源码和配置中的替身词；本地或 CI 运行 Tauri / Cargo 后，`apps/desktop-shell/src-tauri/target/` 会包含依赖 `.d` 等生成文件，若纳入扫描会让门禁被缓存内容污染。