diff --git a/src/__tests__/thread-reaction.test.ts b/src/__tests__/thread-reaction.test.ts
new file mode 100644
index 00000000..2a4c3737
--- /dev/null
+++ b/src/__tests__/thread-reaction.test.ts
@@ -0,0 +1,172 @@
+/**
+ * Thread Reaction Tests
+ *
+ * Tests for the emoji reaction feature in thread messages:
+ * - When user @bot in a thread (no quick-ack), bot adds a reaction as immediate feedback
+ * - After formal reply is sent, bot removes the reaction
+ * - Reaction cleanup happens in finally block (even on error)
+ */
+// @ts-nocheck — test file
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+
+// ============================================================
+// Mock feishuClient
+// ============================================================
+
+const mockAddReaction = vi.fn();
+const mockRemoveReaction = vi.fn().mockResolvedValue(true);
+const mockReplyText = vi.fn();
+const mockReplyTextInThread = vi.fn();
+
+vi.mock('../feishu/client.js', () => ({
+  feishuClient: {
+    addReaction: (...args: unknown[]) => mockAddReaction(...args),
+    removeReaction: (...args: unknown[]) => mockRemoveReaction(...args),
+    replyText: (...args: unknown[]) => mockReplyText(...args),
+    replyTextInThread: (...args: unknown[]) => mockReplyTextInThread(...args),
+    fetchRecentMessages: vi.fn().mockResolvedValue([]),
+    sendCard: vi.fn(),
+    updateCard: vi.fn(),
+    replyCardInThread: vi.fn(),
+  },
+}));
+
+vi.mock('../utils/logger.js', () => ({
+  logger: {
+    info: vi.fn(),
+    warn: vi.fn(),
+    error: vi.fn(),
+    debug: vi.fn(),
+  },
+}));
+
+// ============================================================
+// Tests: Thread reaction logic
+//
+// Simulates the core reaction logic from executeDirectTask
+// without needing to invoke the full function.
+// ============================================================
+
+/**
+ * Simulates the thread reaction add/remove flow from executeDirectTask.
+ */
+async function simulateThreadReactionFlow(params: {
+  messageId: string;
+  eventThreadId?: string;
+  shouldError?: boolean;
+}) {
+  const { feishuClient } = await import('../feishu/client.js');
+  const { messageId, eventThreadId, shouldError } = params;
+
+  // Same logic as executeDirectTask
+  let pendingReactionId: string | undefined;
+  if (eventThreadId) {
+    pendingReactionId = await feishuClient.addReaction(messageId, 'OnIt').catch(() => undefined);
+  }
+
+  try {
+    if (shouldError) {
+      throw new Error('Simulated execution error');
+    }
+
+    // Simulate successful reply
+    await feishuClient.replyTextInThread(messageId, 'response');
+  } catch {
+    // Error handling (reply error message)
+  } finally {
+    // Cleanup reaction (same as executeDirectTask finally block)
+    if (pendingReactionId) {
+      feishuClient.removeReaction(messageId, pendingReactionId).catch(() => {});
+    }
+  }
+
+  return { pendingReactionId };
+}
+
+describe('thread reaction: immediate feedback for @bot in threads', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('adds reaction when eventThreadId is present', async () => {
+    mockAddReaction.mockResolvedValue('reaction-123');
+
+    await simulateThreadReactionFlow({
+      messageId: 'msg-1',
+      eventThreadId: 'thread-1',
+    });
+
+    expect(mockAddReaction).toHaveBeenCalledWith('msg-1', 'OnIt');
+    expect(mockAddReaction).toHaveBeenCalledTimes(1);
+  });
+
+  it('does NOT add reaction when not in thread (main chat)', async () => {
+    await simulateThreadReactionFlow({
+      messageId: 'msg-1',
+      eventThreadId: undefined,
+    });
+
+    expect(mockAddReaction).not.toHaveBeenCalled();
+  });
+
+  it('removes reaction after successful reply', async () => {
+    mockAddReaction.mockResolvedValue('reaction-456');
+
+    await simulateThreadReactionFlow({
+      messageId: 'msg-1',
+      eventThreadId: 'thread-1',
+    });
+
+    expect(mockRemoveReaction).toHaveBeenCalledWith('msg-1', 'reaction-456');
+  });
+
+  it('removes reaction even on execution error (finally block)', async () => {
+    mockAddReaction.mockResolvedValue('reaction-789');
+
+    await simulateThreadReactionFlow({
+      messageId: 'msg-1',
+      eventThreadId: 'thread-1',
+      shouldError: true,
+    });
+
+    // Reaction should still be cleaned up
+    expect(mockRemoveReaction).toHaveBeenCalledWith('msg-1', 'reaction-789');
+  });
+
+  it('does not attempt removal when addReaction fails', async () => {
+    mockAddReaction.mockResolvedValue(undefined);
+
+    await simulateThreadReactionFlow({
+      messageId: 'msg-1',
+      eventThreadId: 'thread-1',
+    });
+
+    // pendingReactionId is undefined → no removal attempt
+    expect(mockRemoveReaction).not.toHaveBeenCalled();
+  });
+
+  it('does not attempt removal when addReaction throws', async () => {
+    mockAddReaction.mockRejectedValue(new Error('API error'));
+
+    await simulateThreadReactionFlow({
+      messageId: 'msg-1',
+      eventThreadId: 'thread-1',
+    });
+
+    // .catch(() => undefined) swallows the error, pendingReactionId is undefined
+    expect(mockRemoveReaction).not.toHaveBeenCalled();
+  });
+
+  it('removal failure does not throw (fire-and-forget)', async () => {
+    mockAddReaction.mockResolvedValue('reaction-abc');
+    mockRemoveReaction.mockRejectedValue(new Error('delete failed'));
+
+    // Should not throw
+    await expect(
+      simulateThreadReactionFlow({
+        messageId: 'msg-1',
+        eventThreadId: 'thread-1',
+      }),
+    ).resolves.not.toThrow();
+  });
+});
diff --git a/src/feishu/client.ts b/src/feishu/client.ts
index 69e0e759..11dfe408 100644
--- a/src/feishu/client.ts
+++ b/src/feishu/client.ts
@@ -641,6 +641,57 @@ export class FeishuClient {
     }
   }
 
+  /**
+   * 给消息添加表情回复（reaction）
+   * 用于在话题内 @bot 时立即反馈（替代 quick-ack）
+   *
+   * @param messageId - 要添加表情的消息 ID
+   * @param emojiType - 表情类型（如 "OnIt", "THUMBSUP" 等飞书 emoji_type）
+   * @returns reaction_id（用于后续删除），失败返回 undefined
+   */
+  async addReaction(messageId: string, emojiType: string): Promise<string | undefined> {
+    try {
+      const resp = await this.client.im.messageReaction.create({
+        path: { message_id: messageId },
+        data: { reaction_type: { emoji_type: emojiType } },
+      });
+
+      if (resp.code !== 0) {
+        logger.warn({ code: resp.code, msg: resp.msg, messageId, emojiType }, 'Failed to add reaction');
+        return undefined;
+      }
+
+      return resp.data?.reaction_id;
+    } catch (err) {
+      logger.warn({ err, messageId, emojiType }, 'Error adding reaction');
+      return undefined;
+    }
+  }
+
+  /**
+   * 删除消息的表情回复（reaction）
+   *
+   * @param messageId - 消息 ID
+   * @param reactionId - 要删除的 reaction_id（由 addReaction 返回）
+   */
+  async removeReaction(messageId: string, reactionId: string): Promise<boolean> {
+    try {
+      const resp = await this.client.im.messageReaction.delete({
+        path: { message_id: messageId, reaction_id: reactionId },
+      });
+
+      if (resp.code !== 0) {
+        logger.warn({ code: resp.code, msg: resp.msg, messageId, reactionId }, 'Failed to remove reaction');
+        return false;
+      }
+
+      return true;
+    } catch (err) {
+      logger.warn({ err, messageId, reactionId }, 'Error removing reaction');
+      return false;
+    }
+  }
+
   /** 获取原始 client 以便直接使用 */
   get raw(): lark.Client {
     return this.client;
diff --git a/src/feishu/event-handler.ts b/src/feishu/event-handler.ts
index 9df455b4..88cd2af8 100644
--- a/src/feishu/event-handler.ts
+++ b/src/feishu/event-handler.ts
@@ -1614,6 +1614,13 @@ async function executeDirectTask(
   let threadReplyMsgId: string | undefined = eventThreadId ? rootId : undefined;
   let threadId: string | undefined = eventThreadId;
 
+  // 话题内消息：跳过 quick-ack，改为先添加表情回复作为即时反馈
+  // 正式回复发出后再移除表情（在 finally 中清理）
+  let pendingReactionId: string | undefined;
+  if (eventThreadId) {
+    pendingReactionId = await feishuClient.addReaction(messageId, 'OnIt').catch(() => undefined);
+  }
+
   try {
     // 快速确认：用小模型判断消息类型并生成短回复
     // 纯问候类消息直接回复后跳过 Claude，其他类型照常走完整查询
@@ -1823,6 +1830,10 @@ async function executeDirectTask(
       await feishuClient.replyText(messageId, errorReply);
     }
   } finally {
+    // 移除话题内的待处理表情回复（无论成功/失败都要清理）
+    if (pendingReactionId) {
+      feishuClient.removeReaction(messageId, pendingReactionId).catch(() => {});
+    }
     try {
       sessionManager.setStatus(chatId, userId, 'idle', agentId);
     } catch (err) {