diff --git a/src/card/reply-dispatcher-types.ts b/src/card/reply-dispatcher-types.ts
index 969e60db..c4f7963c 100644
--- a/src/card/reply-dispatcher-types.ts
+++ b/src/card/reply-dispatcher-types.ts
@@ -112,7 +112,7 @@ export const THROTTLE_CONSTANTS = {
   REASONING_STATUS_MS: 1500,
 } as const;
 
-export const EMPTY_REPLY_FALLBACK_TEXT = 'Done.';
+export const EMPTY_REPLY_FALLBACK_TEXT = '(no reply)';
 
 // ---------------------------------------------------------------------------
 // Factory params and result
diff --git a/tests/reply-dispatcher-empty-fallback.test.ts b/tests/reply-dispatcher-empty-fallback.test.ts
new file mode 100644
index 00000000..0a0eaaf8
--- /dev/null
+++ b/tests/reply-dispatcher-empty-fallback.test.ts
@@ -0,0 +1,74 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import type { ClawdbotConfig } from 'openclaw/plugin-sdk';
+import { updateCardKitCard } from '../src/card/cardkit';
+import { StreamingCardController } from '../src/card/streaming-card-controller';
+
+vi.mock('openclaw/plugin-sdk/reply-runtime', () => ({ SILENT_REPLY_TOKEN: '__silent__' }));
+vi.mock('../src/core/api-error', () => ({
+  extractLarkApiCode: () => undefined,
+}));
+vi.mock('../src/core/lark-logger', () => ({
+  larkLogger: () => ({ debug: vi.fn(), info: vi.fn(), warn: vi.fn(), error: vi.fn() }),
+}));
+vi.mock('../src/core/lark-client', () => ({ LarkClient: {} }));
+vi.mock('../src/core/shutdown-hooks', () => ({ registerShutdownHook: () => () => {} }));
+vi.mock('../src/card/image-resolver', () => ({
+  ImageResolver: class {
+    resolveImages(text: string) {
+      return text;
+    }
+    resolveImagesAwait(text: string) {
+      return Promise.resolve(text);
+    }
+  },
+}));
+vi.mock('../src/messaging/outbound/send', () => ({
+  sendCardFeishu: vi.fn(),
+  updateCardFeishu: vi.fn(),
+}));
+vi.mock('../src/card/cardkit', () => ({
+  createCardEntity: vi.fn(async () => 'card_1'),
+  sendCardByCardId: vi.fn(async () => ({ messageId: 'om_1' })),
+  setCardStreamingMode: vi.fn(async () => {}),
+  streamCardContent: vi.fn(async () => {}),
+  updateCardKitCard: vi.fn(async () => {}),
+}));
+
+describe('StreamingCardController empty reply fallback', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('renders the fallback when completion has no completed or accumulated text', async () => {
+    const controller = new StreamingCardController({
+      cfg: {} as ClawdbotConfig,
+      sessionKey: 'agent:main:feishu:direct:test-empty-reply',
+      accountId: undefined,
+      chatId: 'oc_test',
+      replyToMessageId: 'om_source',
+      replyInThread: false,
+      toolUseDisplay: {
+        mode: 'off',
+        showToolUse: false,
+        showToolResultDetails: false,
+        showFullPaths: false,
+      },
+      resolvedFooter: {
+        status: false,
+        elapsed: false,
+        tokens: false,
+        cache: false,
+        context: false,
+        model: false,
+      },
+    });
+
+    await controller.ensureCardCreated();
+    controller.markFullyComplete();
+    await controller.onIdle();
+
+    expect(updateCardKitCard).toHaveBeenCalledOnce();
+    const renderedCard = vi.mocked(updateCardKitCard).mock.calls[0]?.[0].card;
+    expect(JSON.stringify(renderedCard)).toContain('(no reply)');
+  });
+});