diff --git a/apps/mobile-shell/scripts/check-config.mjs b/apps/mobile-shell/scripts/check-config.mjs
index 20c5e8cd6..af942709c 100644
--- a/apps/mobile-shell/scripts/check-config.mjs
+++ b/apps/mobile-shell/scripts/check-config.mjs
@@ -1265,7 +1265,9 @@ for (const snippet of [
 }
 
 for (const snippet of [
+  'normalizeHostBridgeExternalUrl',
   'resolveMobileShellWebViewUrl',
+  'return normalizeHostBridgeExternalUrl(rawUrl)',
   'shouldOpenInMobileShellWebView(rawUrl, allowedOrigin)',
   'new URL(rawUrl, allowedOrigin).toString()',
 ]) {
@@ -1274,6 +1276,17 @@ for (const snippet of [
   }
 }
 
+if (
+  navigationSource.includes('javascript:') ||
+  navigationSource.includes('mailto:') ||
+  navigationSource.includes('tel:+') ||
+  navigationSource.includes("protocol === '")
+) {
+  throw new Error(
+    'mobile shell WebView external protocol policy must use shared HostBridge normalizer',
+  );
+}
+
 if (shellAppSource.includes('127.0.0.1:3000')) {
   throw new Error(
     'mobile shell ShellApp must not hard-code localhost as the default H5 URL',
diff --git a/apps/mobile-shell/src/shell/navigation.test.ts b/apps/mobile-shell/src/shell/navigation.test.ts
index 731b5ec9a..335bfd6f8 100644
--- a/apps/mobile-shell/src/shell/navigation.test.ts
+++ b/apps/mobile-shell/src/shell/navigation.test.ts
@@ -1,5 +1,6 @@
 import { describe, expect, test } from 'vitest';
 
+import { HOST_BRIDGE_EXTERNAL_URL_PROTOCOLS } from '../../../../packages/shared/src/contracts/hostBridge';
 import {
   resolveMobileShellExternalUrl,
   resolveMobileShellWebViewUrl,
@@ -52,15 +53,16 @@ describe('shouldOpenInMobileShellWebView', () => {
   });
 
   test('只有允许协议能交给系统外部应用打开', () => {
-    expect(resolveMobileShellExternalUrl(' https://example.com/path ')).toBe(
-      'https://example.com/path',
-    );
-    expect(resolveMobileShellExternalUrl('mailto:hi@example.com')).toBe(
-      'mailto:hi@example.com',
-    );
-    expect(resolveMobileShellExternalUrl('tel:+12345678')).toBe(
-      'tel:+12345678',
-    );
+    for (const protocol of HOST_BRIDGE_EXTERNAL_URL_PROTOCOLS) {
+      const url =
+        protocol === 'mailto:'
+          ? 'mailto:hi@example.com'
+          : protocol === 'tel:'
+            ? 'tel:+12345678'
+            : `${protocol}//example.com/path`;
+      expect(resolveMobileShellExternalUrl(` ${url} `)).toBe(url);
+    }
+
     expect(resolveMobileShellExternalUrl('javascript:alert(1)')).toBeNull();
     expect(resolveMobileShellExternalUrl('file:///etc/passwd')).toBeNull();
     expect(resolveMobileShellExternalUrl('/relative/path')).toBeNull();
diff --git a/docs/project-memory/shared-memory/decision-log.md b/docs/project-memory/shared-memory/decision-log.md
index e9bd114d0..8be4ff178 100644
--- a/docs/project-memory/shared-memory/decision-log.md
+++ b/docs/project-memory/shared-memory/decision-log.md
@@ -24,6 +24,7 @@
 - 2026-06-18 外链接入：H5 新增 `openHostExternalUrl()` facade，`native_app` 下会把外链归一化为允许协议的绝对 URL 后请求 `app.openExternalUrl`；ICP备案号和 RPG 资产调试原图入口已优先走宿主系统浏览器，普通浏览器和小程序保留原 `<a>` 行为，宿主不可用或拒绝时回退浏览器外链。
 - 2026-06-18 外链协议白名单门禁：`packages/shared/src/contracts/hostBridge.ts` 的 `HOST_BRIDGE_EXTERNAL_URL_PROTOCOLS` 是 `app.openExternalUrl` 唯一协议来源，当前只允许 `http:`、`https:`、`mailto:`、`tel:`；Expo 直接复用共享归一化逻辑，Tauri Rust 侧必须用 URL parser 镜像同一清单，根级 `npm run check:native-shells` 会拒绝共享契约与桌面壳协议清单漂移。
 - 2026-06-18 移动壳 WebView 导航收紧：Expo WebView 自身拦截外域导航时复用 HostBridge 外链协议白名单，只把 `http:`、`https:`、`mailto:`、`tel:` 交给 `Linking.openURL`，`javascript:`、`file:`、相对异常路径等危险目标直接阻断，避免离开同源主站后仍保留完整 HostBridge。
+- 2026-06-19 移动壳 WebView 外链协议共源：`apps/mobile-shell/src/shell/navigation.ts` 的 WebView 外链离壳判断必须调用共享 `normalizeHostBridgeExternalUrl`，不得在 shell 层另写协议判断；`apps/mobile-shell/scripts/check-config.mjs` 会拒绝重新硬编码 `mailto:` / `tel:` / `javascript:` 等协议分支，`navigation.test.ts` 用 `HOST_BRIDGE_EXTERNAL_URL_PROTOCOLS` 反查当前允许协议。
 - 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。
 - 2026-06-18 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。