diff --git a/apps/mobile-shell/scripts/check-config.mjs b/apps/mobile-shell/scripts/check-config.mjs
index 77ee460cd..56faf7445 100644
--- a/apps/mobile-shell/scripts/check-config.mjs
+++ b/apps/mobile-shell/scripts/check-config.mjs
@@ -1797,6 +1797,9 @@ for (const snippet of [
     throw new Error(`mobile shell clipboard module is missing ${snippet}`);
   }
 }
+if (!bridgeTestSource.includes("'猫'.repeat(100000)")) {
+  throw new Error('mobile shell clipboard tests must cover Unicode truncation');
+}
 
 if (
   !hapticsSource.includes('normalizeHostBridgeHapticsImpactStyle(rawStyle)') ||
diff --git a/apps/mobile-shell/src/host-bridge/bridge.test.ts b/apps/mobile-shell/src/host-bridge/bridge.test.ts
index 7b64f608b..e16da2256 100644
--- a/apps/mobile-shell/src/host-bridge/bridge.test.ts
+++ b/apps/mobile-shell/src/host-bridge/bridge.test.ts
@@ -709,6 +709,17 @@ describe('handleMobileHostBridgeMessage', () => {
 
     expect(expectOk(response).result).toBe(true);
     expect(Clipboard.setStringAsync).toHaveBeenCalledWith('a'.repeat(100000));
+
+    vi.mocked(Clipboard.setStringAsync).mockClear();
+
+    const unicodeResponse = await send(
+      request('clipboard.writeText', {
+        text: '猫'.repeat(100010),
+      }),
+    );
+
+    expect(expectOk(unicodeResponse).result).toBe(true);
+    expect(Clipboard.setStringAsync).toHaveBeenCalledWith('猫'.repeat(100000));
   });
 
   test('clipboard.readText 读取失败时返回 host_error', async () => {