diff --git a/apps/desktop-shell/scripts/check-config.mjs b/apps/desktop-shell/scripts/check-config.mjs
index abaf73229..f1dc05fbe 100644
--- a/apps/desktop-shell/scripts/check-config.mjs
+++ b/apps/desktop-shell/scripts/check-config.mjs
@@ -83,6 +83,14 @@ const desktopShellNetworkSource = fs.readFileSync(
   desktopShellNetworkPath,
   'utf8',
 );
+const desktopShellNavigationPath = new URL(
+  '../src-tauri/src/shell/navigation.rs',
+  import.meta.url,
+);
+const desktopShellNavigationSource = fs.readFileSync(
+  desktopShellNavigationPath,
+  'utf8',
+);
 const productionSourceRoots = [
   new URL('../package.json', import.meta.url),
   new URL('../src-tauri/Cargo.toml', import.meta.url),
@@ -1589,6 +1597,26 @@ if (desktopHostBridgeDispatchSource.includes('json!(HostBridgeRuntime {')) {
   throw new Error('desktop shell host.getRuntime must be built by desktop_runtime()');
 }
 
+if (
+  !desktopShellNavigationSource.includes('pub(crate) fn open_normalized_desktop_external_url') ||
+  !desktopShellNavigationSource.includes(
+    'open_normalized_desktop_external_url(app, external_url)',
+  )
+) {
+  throw new Error(
+    'desktop shell WebView external navigation must use the shared external opener helper',
+  );
+}
+
+if (
+  !desktopHostBridgeDispatchSource.includes('open_normalized_desktop_external_url(&app, url)') ||
+  desktopHostBridgeDispatchSource.includes('app.opener().open_url(')
+) {
+  throw new Error(
+    'desktop shell app.openExternalUrl must use the shared external opener helper',
+  );
+}
+
 if (config.build?.frontendDist !== '../../../dist') {
   throw new Error('desktop shell must package the root H5 dist');
 }
@@ -1930,6 +1958,7 @@ const requiredRustHostSnippets = [
   'desktop_main_window_config(app)?',
   'should_allow_desktop_webview_navigation',
   'desktop_external_navigation_url',
+  'open_normalized_desktop_external_url',
   'open_desktop_external_navigation',
   '.on_navigation(move |url|',
   '.on_new_window(move |url, _features|',
diff --git a/apps/desktop-shell/src-tauri/src/host_bridge/dispatch.rs b/apps/desktop-shell/src-tauri/src/host_bridge/dispatch.rs
index 8b9e62f90..d3bf6fb18 100644
--- a/apps/desktop-shell/src-tauri/src/host_bridge/dispatch.rs
+++ b/apps/desktop-shell/src-tauri/src/host_bridge/dispatch.rs
@@ -12,14 +12,13 @@ use crate::host_bridge::protocol::{
 use crate::host_bridge::share::{share_text_from_request, DesktopShareState};
 use crate::shell::webview::{
     color_scheme_from_theme, desktop_platform, normalize_external_url, normalize_native_page_url,
-    resolve_desktop_network_status,
+    open_normalized_desktop_external_url, resolve_desktop_network_status,
 };
 use serde_json::{json, Value};
 use tauri::Manager;
 use tauri_plugin_clipboard_manager::ClipboardExt;
 use tauri_plugin_dialog::DialogExt;
 use tauri_plugin_notification::{NotificationExt, PermissionState};
-use tauri_plugin_opener::OpenerExt;
 
 const BADGE_COUNT_MAX: i64 = 99999;
 const LOCAL_NOTIFICATION_TITLE_MAX_LENGTH: usize = 80;
@@ -192,7 +191,7 @@ pub(super) async fn execute_host_bridge_request(
                 }
             };
 
-            match app.opener().open_url(url, None::<&str>) {
+            match open_normalized_desktop_external_url(&app, url) {
                 Ok(()) => ok(request.id, json!(true)),
                 Err(error) => failed(request.id, "host_error", error.to_string()),
             }
diff --git a/apps/desktop-shell/src-tauri/src/shell/navigation.rs b/apps/desktop-shell/src-tauri/src/shell/navigation.rs
index 14e33934f..67db9a24a 100644
--- a/apps/desktop-shell/src-tauri/src/shell/navigation.rs
+++ b/apps/desktop-shell/src-tauri/src/shell/navigation.rs
@@ -149,11 +149,20 @@ pub(crate) fn desktop_external_navigation_url(url: &Url) -> Option<String> {
     normalize_external_url(url.as_str())
 }
 
+pub(crate) fn open_normalized_desktop_external_url(
+    app: &tauri::AppHandle,
+    external_url: String,
+) -> Result<(), String> {
+    app.opener()
+        .open_url(external_url, None::<&str>)
+        .map_err(|error| error.to_string())
+}
+
 pub(crate) fn open_desktop_external_navigation(app: &tauri::AppHandle, url: &Url) {
     let Some(external_url) = desktop_external_navigation_url(url) else {
         return;
     };
-    let _ = app.opener().open_url(external_url, None::<&str>);
+    let _ = open_normalized_desktop_external_url(app, external_url);
 }
 
 pub(crate) fn should_allow_desktop_webview_download(event: &DownloadEvent<'_>) -> bool {
diff --git a/apps/desktop-shell/src-tauri/src/shell/webview.rs b/apps/desktop-shell/src-tauri/src/shell/webview.rs
index 025f4b011..20711df8b 100644
--- a/apps/desktop-shell/src-tauri/src/shell/webview.rs
+++ b/apps/desktop-shell/src-tauri/src/shell/webview.rs
@@ -5,8 +5,8 @@ pub(crate) use crate::shell::lifecycle::{
 };
 pub(crate) use crate::shell::navigation::{
     normalize_external_url, normalize_native_page_url, open_desktop_external_navigation,
-    register_desktop_navigation_events, should_allow_desktop_webview_download,
-    should_allow_desktop_webview_navigation,
+    open_normalized_desktop_external_url, register_desktop_navigation_events,
+    should_allow_desktop_webview_download, should_allow_desktop_webview_navigation,
 };
 pub(crate) use crate::shell::network::{
     register_desktop_network_events, resolve_desktop_network_status,
diff --git a/docs/project-memory/shared-memory/decision-log.md b/docs/project-memory/shared-memory/decision-log.md
index 6a095c729..7e3ca7ec7 100644
--- a/docs/project-memory/shared-memory/decision-log.md
+++ b/docs/project-memory/shared-memory/decision-log.md
@@ -29,6 +29,7 @@
 - 2026-06-19 移动壳外链打开 helper 共用：Expo WebView 外域拦截和 HostBridge `app.openExternalUrl` 都必须复用 `openMobileShellExternalNavigation` 执行系统外链打开动作；HostBridge 分支仍先调用 `normalizeHostBridgeExternalUrlPayload` 保留 payload 错误语义，但不再单独维护 `Linking.canOpenURL` / `Linking.openURL` 顺序。移动壳配置检查会拒绝 `app.openExternalUrl` 绕开该 helper，避免两条离壳路径漂移。
 - 2026-06-19 移动壳系统分享 URL 边界：Expo `share.open` 调用 React Native 系统分享面板前，只允许把 `url`、`href`、`path`、`targetPath` 和 `work` 归一为 `https://app.genarrative.world` 同源公开 URL；外域、协议相对 URL、`javascript:` 等危险目标必须返回 `invalid_request`，且显式非法 payload 不得回退到之前缓存的 `share.setTarget` 目标。分享实现复用移动壳入口 URL 的生产主站 origin，配置检查会拒绝重新声明同值 origin 或移除协议相对 URL 拦截。
 - 2026-06-19 桌面壳系统分享 URL 边界：Tauri `share.open` 写入系统剪贴板前同样只允许把 `url`、`href`、`path`、`targetPath` 和 `work` 归一为 `https://app.genarrative.world` 同源公开 URL；外域、协议相对 URL、`javascript:` 等危险目标必须返回 `invalid_request`，且显式非法 payload 不得回退到之前缓存的 `share.setTarget` 目标。桌面壳配置检查会拒绝移除同源分享 URL 归一和协议相对 URL 拦截。
+- 2026-06-19 桌面壳外链打开 helper 共用：Tauri WebView 外域拦截和 HostBridge `app.openExternalUrl` 都必须复用 `open_normalized_desktop_external_url` 执行系统外链打开动作；HostBridge 分支仍先用 `normalize_external_url` 保留 payload 错误语义并把 opener 错误回传给 H5，WebView 拦截保持 best-effort 静默处理。桌面壳配置检查会拒绝 `dispatch.rs` 直接调用 `app.opener().open_url` 绕过该 helper，避免两条离壳路径漂移。
 - 2026-06-18 能力声明收紧：`packages/shared/src/contracts/hostBridge.ts` 提供 HostBridge method / capability 白名单，H5 的 `getHostRuntime()` 会解析并过滤 `hostCapabilities`；`openHostShare`、`writeHostClipboardText`、`requestHostHapticsImpact`、`setHostAppTitle`、`exportHostTextFile` 等 native 能力只在宿主声明对应 capability 后调用。发布分享弹窗只有声明 `share.open` 时才显示“系统分享”，避免旧壳或裁剪壳露出不可用入口。
 - 2026-06-18 宿主 runtime 回读：主 App 启动时会通过真实 `host.getRuntime` 回读 Expo / Tauri runtime 并缓存过滤后的能力清单，能力来源为 URL `hostCapabilities` 与宿主真实回包的并集；裁剪壳或旧入口 URL 缺少 `hostCapabilities` 时也能启用真实声明能力，但仍不会仅凭 `native_app` 或 transport 存在推断能力可用。该回读请求的短超时由共享契约 `HOST_BRIDGE_RUNTIME_REFRESH_TIMEOUT_MS` 声明，H5 facade 不得本地重声明。
 - 2026-06-18 壳能力防漂移：`npm run mobile-shell:typecheck` 与 `npm run desktop-shell:typecheck` 会校验 Expo / Tauri 壳声明的 capability 均来自共享 HostBridge 白名单，并校验壳 runtime 回包、H5 URL `hostCapabilities` 和实现分支保持一致；微信小程序 `WECHAT_HOST_CAPABILITIES` 由 `miniprogram/host-bridge/protocol.test.js` 和根级 `npm run check:native-shells` 反查共享 `HOST_BRIDGE_WECHAT_MINI_PROGRAM_CAPABILITIES`。新增能力必须先更新契约和真实壳实现，再通过这些检查。