diff --git a/apps/mobile-shell/scripts/check-config.mjs b/apps/mobile-shell/scripts/check-config.mjs
index f4b88056f..f6831b93b 100644
--- a/apps/mobile-shell/scripts/check-config.mjs
+++ b/apps/mobile-shell/scripts/check-config.mjs
@@ -1646,6 +1646,7 @@ for (const snippet of [
   "throw invalidRequest('target is required')",
   'const normalizedTarget = normalizeHostBridgeShareOpenPayload(target);',
   "'share target is invalid'",
+  "message: 'share unavailable'",
   'ok(request, true)',
   'resetMobileHostBridgeShareTargetForTest',
 ]) {
@@ -1669,8 +1670,10 @@ for (const snippet of [
   'resetMobileHostBridgeShareTargetForTest()',
   'uses cached work target when share.open has no explicit payload',
   'keeps the previous cached target when a new target is missing or invalid',
+  'maps native share sheet failures to stable host errors',
   'does not fall back to cached target when explicit payload is unsafe',
   'rejects empty share requests before opening native share sheet',
+  "message: 'share unavailable'",
   'https://app.genarrative.world/works/detail?work=PZ-00000001',
   'javascript:alert(1)',
   'expect(Share.share).not.toHaveBeenCalled()',
diff --git a/apps/mobile-shell/src/host-bridge/share.test.ts b/apps/mobile-shell/src/host-bridge/share.test.ts
index d6f0d2479..3ee1598f0 100644
--- a/apps/mobile-shell/src/host-bridge/share.test.ts
+++ b/apps/mobile-shell/src/host-bridge/share.test.ts
@@ -159,6 +159,22 @@ describe('mobile share helpers', () => {
     });
   });
 
+  test('maps native share sheet failures to stable host errors', async () => {
+    vi.mocked(Share.share).mockRejectedValueOnce(new Error('native share failed'));
+
+    await expect(
+      openShare(
+        request('share.open', {
+          title: '测试作品',
+          url: 'https://app.genarrative.world/works/detail?work=PZ-1',
+        }),
+      ),
+    ).rejects.toMatchObject({
+      code: 'host_error',
+      message: 'share unavailable',
+    });
+  });
+
   test.each([
     'https://example.com/works/detail?work=PZ-1',
     '//example.com/works/detail?work=PZ-1',
diff --git a/apps/mobile-shell/src/host-bridge/share.ts b/apps/mobile-shell/src/host-bridge/share.ts
index 749616897..f2793b4a1 100644
--- a/apps/mobile-shell/src/host-bridge/share.ts
+++ b/apps/mobile-shell/src/host-bridge/share.ts
@@ -1,6 +1,7 @@
 import { Share } from 'react-native';
 
 import {
+  type HostBridgeError,
   type HostBridgeRequest,
   normalizeHostBridgeShareOpenPayload,
 } from '../../../../packages/shared/src/contracts/hostBridge';
@@ -57,10 +58,17 @@ export async function openShare(request: HostBridgeRequest) {
   const url = sharePayload?.url;
   const message = [sharePayload?.message, url].filter(Boolean).join('\n');
 
-  await Share.share({
-    title: sharePayload?.title,
-    message: message || url || sharePayload?.title || '',
-    url,
-  });
+  try {
+    await Share.share({
+      title: sharePayload?.title,
+      message: message || url || sharePayload?.title || '',
+      url,
+    });
+  } catch {
+    throw {
+      code: 'host_error',
+      message: 'share unavailable',
+    } satisfies HostBridgeError;
+  }
   return ok(request, true);
 }