diff --git a/hub/src/feishu/card/streaming-card.ts b/hub/src/feishu/card/streaming-card.ts
index e3d5b62..907b375 100644
--- a/hub/src/feishu/card/streaming-card.ts
+++ b/hub/src/feishu/card/streaming-card.ts
@@ -20,7 +20,7 @@
  *   6. fail(errorText)      — flush + transition to error card
  */
 
-import type { FeishuRuntime } from "../client.js";
+import type { FeishuRuntime, SendMessageOptions } from "../client.js";
 import { sendCard, patchCard, sendText } from "../client.js";
 import { DEFAULT_MAX_MESSAGE_LENGTH, splitAtBoundary } from "../textStream.js";
 import {
@@ -41,6 +41,7 @@ export interface StreamingCardOptions {
   readonly runId: string;
   readonly rt: FeishuRuntime;
   readonly chatId: string;
+  readonly sendOptions?: SendMessageOptions | undefined;
   readonly patchIntervalMs: number | undefined;
   readonly maxMessageLength: number | undefined;
 }
@@ -61,6 +62,7 @@ export class StreamingAgentCard {
   private readonly runId: string;
   private readonly rt: FeishuRuntime;
   private readonly chatId: string;
+  private readonly sendOptions: SendMessageOptions | undefined;
   private readonly patchIntervalMs: number;
   private readonly maxMessageLength: number;
 
@@ -68,6 +70,7 @@ export class StreamingAgentCard {
     this.runId = options.runId;
     this.rt = options.rt;
     this.chatId = options.chatId;
+    this.sendOptions = options.sendOptions;
     this.patchIntervalMs = options.patchIntervalMs ?? DEFAULT_PATCH_INTERVAL_MS;
     this.maxMessageLength = options.maxMessageLength ?? DEFAULT_MAX_MESSAGE_LENGTH;
     startToolUseTraceRun(this.runId);
@@ -119,7 +122,7 @@ export class StreamingAgentCard {
         updated = await this.flushCard("complete", fallbackText);
       }
       if (!updated && this.interrupted) {
-        await sendText(this.rt, this.chatId, "\u5DF2\u4E2D\u65AD\u5F53\u524D\u8FD0\u884C\u3002");
+        await sendText(this.rt, this.chatId, "\u5DF2\u4E2D\u65AD\u5F53\u524D\u8FD0\u884C\u3002", this.sendOptions);
       }
     } finally {
       clearToolUseTraceRun(this.runId);
@@ -178,7 +181,7 @@ export class StreamingAgentCard {
     });
 
     if (this.currentMessageId === null) {
-      this.currentMessageId = await sendCard(this.rt, this.chatId, card);
+      this.currentMessageId = await sendCard(this.rt, this.chatId, card, this.sendOptions);
       let updated = this.currentMessageId !== null;
       // Send overflow chunks as new messages (rare for agent output)
       for (const chunk of chunks.slice(1)) {
@@ -192,7 +195,7 @@ export class StreamingAgentCard {
           interrupted: this.interrupted,
           runId: undefined,
         });
-        const overflowMessageId = await sendCard(this.rt, this.chatId, overflowCard);
+        const overflowMessageId = await sendCard(this.rt, this.chatId, overflowCard, this.sendOptions);
         updated = updated && overflowMessageId !== null;
         this.currentMessageId = overflowMessageId;
       }
@@ -211,7 +214,7 @@ export class StreamingAgentCard {
           interrupted: this.interrupted,
           runId: undefined,
         });
-        const overflowMessageId = await sendCard(this.rt, this.chatId, overflowCard);
+        const overflowMessageId = await sendCard(this.rt, this.chatId, overflowCard, this.sendOptions);
         updated = updated && overflowMessageId !== null;
         this.currentMessageId = overflowMessageId;
       }
diff --git a/hub/src/feishu/client.ts b/hub/src/feishu/client.ts
index 9ec5e21..e355d4d 100644
--- a/hub/src/feishu/client.ts
+++ b/hub/src/feishu/client.ts
@@ -28,6 +28,10 @@ export interface OutboundPayload {
   readonly content: string;
 }
 
+export interface SendMessageOptions {
+  readonly replyToMessageId?: string | undefined;
+}
+
 export async function withRetry<T>(
   fn: () => Promise<T>,
   options: {
@@ -193,29 +197,24 @@ export function parsePostMessage(content: string): { text: string; imageKeys: st
 }
 
 /** Send a text message using the best Feishu message type for the content. */
-export async function sendTextMessage(rt: FeishuRuntime, chatId: string, text: string): Promise<string | null> {
+export async function sendTextMessage(
+  rt: FeishuRuntime,
+  chatId: string,
+  text: string,
+  options?: SendMessageOptions,
+): Promise<string | null> {
   const payload = buildOutboundPayload(text);
-  const client = rt.client as unknown as {
-    im: { v1: { message: { create: (p: unknown) => Promise<MessageCreateResponse> } } };
-  };
   try {
-    const res = await client.im.v1.message.create({
-      params: { receive_id_type: "chat_id" },
-      data: { receive_id: chatId, msg_type: payload.msgType, content: payload.content },
-    });
-    return messageIdFromResponse(res);
+    return await sendMessagePayload(rt, chatId, payload, options);
   } catch (e) {
     if (payload.msgType === "post" && isPostContentFormatError(e)) {
       try {
-        const res = await client.im.v1.message.create({
-          params: { receive_id_type: "chat_id" },
-          data: {
-            receive_id: chatId,
-            msg_type: "text",
-            content: JSON.stringify({ text: _stripMarkdownToPlainText(text) }),
-          },
-        });
-        return messageIdFromResponse(res);
+        return await sendMessagePayload(
+          rt,
+          chatId,
+          { msgType: "text", content: JSON.stringify({ text: _stripMarkdownToPlainText(text) }) },
+          options,
+        );
       } catch {
         return null;
       }
@@ -225,10 +224,15 @@ export async function sendTextMessage(rt: FeishuRuntime, chatId: string, text: s
 }
 
 /** Send long text as multiple Feishu messages. Returns the last successful message_id. */
-export async function sendLongText(rt: FeishuRuntime, chatId: string, text: string): Promise<string | null> {
+export async function sendLongText(
+  rt: FeishuRuntime,
+  chatId: string,
+  text: string,
+  options?: SendMessageOptions,
+): Promise<string | null> {
   let lastMessageId: string | null = null;
   for (const chunk of splitAtBoundary(text, DEFAULT_MAX_MESSAGE_LENGTH)) {
-    const messageId = await sendTextMessage(rt, chatId, chunk);
+    const messageId = await sendTextMessage(rt, chatId, chunk, options);
     if (messageId !== null) {
       lastMessageId = messageId;
     }
@@ -237,23 +241,31 @@ export async function sendLongText(rt: FeishuRuntime, chatId: string, text: stri
 }
 
 /** Send a plain text message (fire-and-forget). */
-export async function sendText(rt: FeishuRuntime, chatId: string, text: string): Promise<void> {
-  await sendTextMessage(rt, chatId, text);
+export async function sendText(
+  rt: FeishuRuntime,
+  chatId: string,
+  text: string,
+  options?: SendMessageOptions,
+): Promise<void> {
+  await sendTextMessage(rt, chatId, text, options);
 }
 
 /** Send an interactive card message (always patchable). Used for streaming. */
-export async function sendInteractiveCardMessage(rt: FeishuRuntime, chatId: string, text: string): Promise<string | null> {
+export async function sendInteractiveCardMessage(
+  rt: FeishuRuntime,
+  chatId: string,
+  text: string,
+  options?: SendMessageOptions,
+): Promise<string | null> {
   const payload = buildOutboundPayload(text);
   const card = buildInteractiveCardFromOutboundPayload(payload);
-  const client = rt.client as unknown as {
-    im: { v1: { message: { create: (p: unknown) => Promise<MessageCreateResponse> } } };
-  };
   try {
-    const res = await client.im.v1.message.create({
-      params: { receive_id_type: "chat_id" },
-      data: { receive_id: chatId, msg_type: "interactive", content: JSON.stringify(card) },
-    });
-    return messageIdFromResponse(res);
+    return await sendMessagePayload(
+      rt,
+      chatId,
+      { msgType: "interactive", content: JSON.stringify(card) },
+      options,
+    );
   } catch {
     return null;
   }
@@ -278,16 +290,19 @@ export async function patchTextMessage(rt: FeishuRuntime, messageId: string, tex
 }
 
 /** Send a raw interactive card (arbitrary JSON). Returns message_id on success. */
-export async function sendCard(rt: FeishuRuntime, chatId: string, card: Record<string, unknown>): Promise<string | null> {
-  const client = rt.client as unknown as {
-    im: { v1: { message: { create: (p: unknown) => Promise<MessageCreateResponse> } } };
-  };
+export async function sendCard(
+  rt: FeishuRuntime,
+  chatId: string,
+  card: Record<string, unknown>,
+  options?: SendMessageOptions,
+): Promise<string | null> {
   try {
-    const res = await client.im.v1.message.create({
-      params: { receive_id_type: "chat_id" },
-      data: { receive_id: chatId, msg_type: "interactive", content: JSON.stringify(card) },
-    });
-    return messageIdFromResponse(res);
+    return await sendMessagePayload(
+      rt,
+      chatId,
+      { msgType: "interactive", content: JSON.stringify(card) },
+      options,
+    );
   } catch {
     return null;
   }
@@ -318,6 +333,7 @@ export async function sendApprovalCard(
   title: string,
   body: string,
   buttons: ReadonlyArray<{ label: string; value: string; style?: "primary" | "default" | "danger" }>,
+  options?: SendMessageOptions,
 ): Promise<string | null> {
   const card = {
     config: { wide_screen_mode: true },
@@ -335,15 +351,13 @@ export async function sendApprovalCard(
       },
     ],
   };
-  const client = rt.client as unknown as {
-    im: { v1: { message: { create: (p: unknown) => Promise<MessageCreateResponse> } } };
-  };
   try {
-    const res = await client.im.v1.message.create({
-      params: { receive_id_type: "chat_id" },
-      data: { receive_id: chatId, msg_type: "interactive", content: JSON.stringify(card) },
-    });
-    return messageIdFromResponse(res);
+    return await sendMessagePayload(
+      rt,
+      chatId,
+      { msgType: "interactive", content: JSON.stringify(card) },
+      options,
+    );
   } catch (e) {
     rt.logger.warn({ chatId, err: e instanceof Error ? e.message : String(e) }, "sendApprovalCard failed");
     return null;
@@ -491,11 +505,16 @@ export async function downloadMessageFile(
 }
 
 /** Upload and send a file to a chat. */
-export async function sendFile(rt: FeishuRuntime, chatId: string, filePath: string, fileName: string): Promise<string | null> {
+export async function sendFile(
+  rt: FeishuRuntime,
+  chatId: string,
+  filePath: string,
+  fileName: string,
+  options?: SendMessageOptions,
+): Promise<string | null> {
   const client = rt.client as unknown as {
     im: { v1: {
       file: { create: (p: unknown) => Promise<FileCreateResponse> }
-      message: { create: (p: unknown) => Promise<MessageCreateResponse> }
     } };
   };
   try {
@@ -510,13 +529,9 @@ export async function sendFile(rt: FeishuRuntime, chatId: string, filePath: stri
       rt.logger.warn({ chatId, filePath }, "sendFile failed: upload response missing file_key");
       return null;
     }
-    const msgRes = await withRetry(async () =>
-      client.im.v1.message.create({
-        params: { receive_id_type: "chat_id" },
-        data: { receive_id: chatId, msg_type: "file", content: JSON.stringify({ file_key: fileKey }) },
-      }),
+    const messageId = await withRetry(async () =>
+      sendMessagePayload(rt, chatId, { msgType: "file", content: JSON.stringify({ file_key: fileKey }) }, options),
     );
-    const messageId = messageIdFromResponse(msgRes);
     if (messageId === null) {
       rt.logger.warn({ chatId, filePath }, "sendFile failed: message response missing message_id");
     }
@@ -527,6 +542,41 @@ export async function sendFile(rt: FeishuRuntime, chatId: string, filePath: stri
   }
 }
 
+async function sendMessagePayload(
+  rt: FeishuRuntime,
+  chatId: string,
+  payload: OutboundPayload,
+  options?: SendMessageOptions,
+): Promise<string | null> {
+  const client = rt.client as unknown as {
+    im: { v1: { message: {
+      create: (p: unknown) => Promise<MessageCreateResponse>;
+      reply: (p: unknown) => Promise<MessageCreateResponse>;
+    } } };
+  };
+  const replyToMessageId = normalizeReplyMessageId(options?.replyToMessageId);
+  if (replyToMessageId !== null) {
+    const res = await client.im.v1.message.reply({
+      path: { message_id: replyToMessageId },
+      data: {
+        msg_type: payload.msgType,
+        content: payload.content,
+      },
+    });
+    return messageIdFromResponse(res);
+  }
+
+  const res = await client.im.v1.message.create({
+    params: { receive_id_type: "chat_id" },
+    data: { receive_id: chatId, msg_type: payload.msgType, content: payload.content },
+  });
+  return messageIdFromResponse(res);
+}
+
+function normalizeReplyMessageId(messageId: string | undefined): string | null {
+  return messageId === undefined || messageId === "" ? null : messageId;
+}
+
 type MessageCreateResponse = {
   readonly message_id?: string | undefined;
   readonly data?: { readonly message_id?: string | undefined } | undefined;
diff --git a/hub/src/feishu/fileDeliveryTool.ts b/hub/src/feishu/fileDeliveryTool.ts
index 5a0ea4b..76ae653 100644
--- a/hub/src/feishu/fileDeliveryTool.ts
+++ b/hub/src/feishu/fileDeliveryTool.ts
@@ -1,6 +1,6 @@
 import { createSdkMcpServer, tool, type McpSdkServerConfigWithInstance } from "@anthropic-ai/claude-agent-sdk";
 import { z } from "zod";
-import { sendApprovalCard, sendFile, type FeishuRuntime } from "./client.js";
+import { sendApprovalCard, sendFile, type FeishuRuntime, type SendMessageOptions } from "./client.js";
 import { resolveDeliverableFile } from "./fileDelivery.js";
 import { readFeishuContext } from "./read.js";
 import type { ApprovalManager } from "./approval.js";
@@ -11,6 +11,7 @@ export interface FileDeliveryToolOptions {
   readonly projectId: string;
   readonly runId: string;
   readonly workspaceDir: string;
+  readonly sendOptions?: SendMessageOptions | undefined;
   readonly approvalManager: ApprovalManager;
   readonly onDelivered?: (path: string) => void;
 }
@@ -43,7 +44,7 @@ export function createFileDeliveryMcpServer(options: FileDeliveryToolOptions): M
             };
           }
 
-          const messageId = await sendFile(options.rt, options.chatId, file.path, args.name ?? file.name);
+          const messageId = await sendFile(options.rt, options.chatId, file.path, args.name ?? file.name, options.sendOptions);
           if (messageId === null) {
             return {
               isError: true,
@@ -106,6 +107,7 @@ export function createFileDeliveryMcpServer(options: FileDeliveryToolOptions): M
               value: option.value,
               ...(option.style === undefined ? {} : { style: option.style }),
             })),
+            options.sendOptions,
           );
           if (messageId === null) {
             return {
diff --git a/hub/src/feishu/slashCommands.ts b/hub/src/feishu/slashCommands.ts
index 4a9ca72..f8b5c8b 100644
--- a/hub/src/feishu/slashCommands.ts
+++ b/hub/src/feishu/slashCommands.ts
@@ -2,7 +2,7 @@ import type { PrismaClient } from "@prisma/client";
 import type { FastifyBaseLogger } from "fastify";
 import type { ModelRegistry, RoleEntry } from "../agent/models.js";
 import type { RuntimeSettings } from "../settings/runtime.js";
-import { sendText, type FeishuRuntime } from "./client.js";
+import { sendText, type FeishuRuntime, type SendMessageOptions } from "./client.js";
 import type { TriggerQueue } from "./triggerQueue.js";
 
 export interface SlashInvocation {
@@ -15,6 +15,7 @@ export interface SlashCommandRunContext {
   readonly projectId: string;
   readonly chatId: string;
   readonly rt: FeishuRuntime;
+  readonly sendOptions?: SendMessageOptions | undefined;
 }
 
 export interface SlashCommandDefinition {
@@ -68,9 +69,9 @@ export function createSlashCommandRegistry(deps: SlashCommandRegistryDeps): Read
       "不创建 agent run,也不改变当前会话。",
       "支持 /help new 和 /new help 两种写法。",
     ],
-    run: async ({ invocation, projectId, chatId, rt }) => {
+    run: async ({ invocation, projectId, chatId, rt, sendOptions }) => {
       const registry = await deps.settings.modelRegistry({ projectId });
-      await sendText(rt, chatId, formatHelpCommandInvocation(invocation, registry, commands));
+      await sendText(rt, chatId, formatHelpCommandInvocation(invocation, registry, commands), sendOptions);
     },
   });
 
@@ -82,12 +83,12 @@ export function createSlashCommandRegistry(deps: SlashCommandRegistryDeps): Read
       "归档当前未归档的 agent session。",
       "不会清空当前项目的等待队列。",
     ],
-    run: async ({ projectId, chatId, rt }) => {
+    run: async ({ projectId, chatId, rt, sendOptions }) => {
       await deps.prisma.agentSession.updateMany({
         where: { projectId, archivedAt: null },
         data: { archivedAt: new Date() },
       });
-      await sendText(rt, chatId, "已开新会话,下次 @bot 将从头开始。");
+      await sendText(rt, chatId, "已开新会话,下次 @bot 将从头开始。", sendOptions);
     },
   });
 
@@ -99,21 +100,21 @@ export function createSlashCommandRegistry(deps: SlashCommandRegistryDeps): Read
       "只恢复当前项目最近归档的 agent session。",
       "没有可恢复会话时只回复提示,不会创建 agent run。",
     ],
-    run: async ({ projectId, chatId, rt }) => {
+    run: async ({ projectId, chatId, rt, sendOptions }) => {
       const latest = await deps.prisma.agentSession.findFirst({
         where: { projectId, archivedAt: { not: null } },
         orderBy: { archivedAt: "desc" },
         select: { id: true },
       });
       if (latest === null) {
-        await sendText(rt, chatId, "没有可恢复的会话。");
+        await sendText(rt, chatId, "没有可恢复的会话。", sendOptions);
         return;
       }
       await deps.prisma.agentSession.update({
         where: { id: latest.id },
         data: { archivedAt: null },
       });
-      await sendText(rt, chatId, "已恢复上一个会话。");
+      await sendText(rt, chatId, "已恢复上一个会话。", sendOptions);
     },
   });
 
@@ -125,7 +126,7 @@ export function createSlashCommandRegistry(deps: SlashCommandRegistryDeps): Read
       "归档当前未归档的 agent session。",
       "清空当前项目已经排队、尚未开始的触发请求。",
     ],
-    run: async ({ projectId, chatId, rt }) => {
+    run: async ({ projectId, chatId, rt, sendOptions }) => {
       await deps.prisma.agentSession.updateMany({
         where: { projectId, archivedAt: null },
         data: { archivedAt: new Date() },
@@ -134,7 +135,7 @@ export function createSlashCommandRegistry(deps: SlashCommandRegistryDeps): Read
       if (cleared > 0) {
         deps.logger.info({ projectId, cleared }, "feishu trigger: cleared queued triggers on reset");
       }
-      await sendText(rt, chatId, "已重置,下次 @bot 将从头开始。");
+      await sendText(rt, chatId, "已重置,下次 @bot 将从头开始。", sendOptions);
     },
   });
 
diff --git a/hub/src/feishu/trigger.ts b/hub/src/feishu/trigger.ts
index 0ca7cf5..44c8f26 100644
--- a/hub/src/feishu/trigger.ts
+++ b/hub/src/feishu/trigger.ts
@@ -25,6 +25,7 @@ import {
   type CardActionEvent,
   type FeishuRuntime,
   type MessageReceiveEvent,
+  type SendMessageOptions,
 } from "./client.js";
 import { runAgent as defaultRunAgent, type ProjectContext, type RunRequest, type RunResult } from "../agent/runner.js";
 import type { RuntimeSettings } from "../settings/runtime.js";
@@ -124,6 +125,7 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
     options: { readonly queueIfLocked?: boolean } = {},
   ): Promise<StartAgentRunOutcome> {
     const { msg, rt, chatId, projectId, senderOpenId, actor } = context;
+    const sendOptions = sendOptionsForTriggerMessage(msg);
     const queueIfLocked = options.queueIfLocked ?? true;
 
     // ADR-0002: if locked by another run, enqueue the trigger for this project.
@@ -169,7 +171,7 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
           sender: await senderAuditMetadata(rt, senderOpenId),
         },
       });
-      await sendText(rt, chatId, `无权限使用角色 ${roleId}。`);
+      await sendText(rt, chatId, `无权限使用角色 ${roleId}。`, sendOptions);
       return "skipped";
     }
     const role = models.role(roleId);
@@ -279,7 +281,14 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
     // Streaming agent card: single interactive card through the full run
     // lifecycle (thinking → tool calls → streaming text → complete).
     // Shows tool-use trace panel + reasoning panel + answer text.
-    const card = new StreamingAgentCard({ runId: run.id, rt, chatId, patchIntervalMs: undefined, maxMessageLength: undefined });
+    const card = new StreamingAgentCard({
+      runId: run.id,
+      rt,
+      chatId,
+      sendOptions,
+      patchIntervalMs: undefined,
+      maxMessageLength: undefined,
+    });
     const deliveredFiles: string[] = [];
     const fileDeliveryMcpServer = createFileDeliveryMcpServer({
       rt,
@@ -287,6 +296,7 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
       projectId,
       runId: run.id,
       workspaceDir: project.workspaceDir,
+      sendOptions,
       approvalManager,
       onDelivered: (path) => {
         deliveredFiles.push(path);
@@ -422,11 +432,16 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
     });
     if (position === 0) {
       await reactToMessage(context.rt, context.msg.message_id, "OnIt");
-      await sendText(context.rt, context.chatId, "队列已满，请稍后再试");
+      await sendText(context.rt, context.chatId, "队列已满，请稍后再试", sendOptionsForTriggerMessage(context.msg));
       return "rejected";
     }
 
-    await sendText(context.rt, context.chatId, `已加入队列（第${position}位），当前处理完成后将自动开始`);
+    await sendText(
+      context.rt,
+      context.chatId,
+      `已加入队列（第${position}位），当前处理完成后将自动开始`,
+      sendOptionsForTriggerMessage(context.msg),
+    );
     return "queued";
   }
 
@@ -614,7 +629,7 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
     if (senderOpenId === "") {
       deps.logger.warn({ projectId, chatId }, "feishu trigger: sender has no open_id, denying");
       await writeAudit(deps.prisma, { projectId, action: "trigger.denied", metadata: { reason: "missing open_id" } });
-      await sendText(rt, chatId, "无法识别发送者,拒绝触发。");
+      await sendText(rt, chatId, "无法识别发送者,拒绝触发。", sendOptionsForTriggerMessage(msg));
       return;
     }
     const actor = { feishuOpenId: senderOpenId, chatId };
@@ -634,7 +649,7 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
           sender: await senderAuditMetadata(rt, senderOpenId),
         },
       });
-      await sendText(rt, chatId, "无权限触发。");
+      await sendText(rt, chatId, "无权限触发。", sendOptionsForTriggerMessage(msg));
       return;
     }
 
@@ -689,14 +704,14 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
       if (helpSubcommandTarget !== null) {
         // Help is generated on demand because role/tool configuration is runtime data.
         const models = await deps.settings.modelRegistry({ projectId });
-        await sendText(rt, chatId, formatSlashHelpTarget(helpSubcommandTarget, models, slashCommands));
+        await sendText(rt, chatId, formatSlashHelpTarget(helpSubcommandTarget, models, slashCommands), sendOptionsForTriggerMessage(msg));
         return;
       }
 
       if (invocation !== null) {
         const slashCommand = slashCommands.get(invocation.name);
         if (slashCommand !== undefined) {
-          await slashCommand.run({ invocation, projectId, chatId, rt });
+          await slashCommand.run({ invocation, projectId, chatId, rt, sendOptions: sendOptionsForTriggerMessage(msg) });
           return;
         }
       }
@@ -772,6 +787,10 @@ function nonEmpty(value: string | undefined): string | undefined {
   return value === undefined || value === "" ? undefined : value;
 }
 
+function sendOptionsForTriggerMessage(msg: MessageReceiveEvent["message"]): SendMessageOptions {
+  return { replyToMessageId: msg.message_id };
+}
+
 function approvalActionFromValue(value: unknown): string | null {
   if (typeof value === "string") {
     try {
diff --git a/hub/test/integration/helpers.ts b/hub/test/integration/helpers.ts
index 73df524..c1a18e6 100644
--- a/hub/test/integration/helpers.ts
+++ b/hub/test/integration/helpers.ts
@@ -62,6 +62,12 @@ export interface MockFeishuRuntime extends FeishuRuntime {
   readonly sentTexts: string[];
   readonly sentCards: unknown[];
   readonly sentPatches: unknown[];
+  readonly sentReplies: Array<{
+    readonly messageId: string;
+    readonly msgType: string;
+    readonly content: string;
+    readonly replyInThread: unknown;
+  }>;
   readonly reactions: Array<{ readonly messageId: string; readonly emoji: string }>;
   readonly readableMessages: Map<string, MockFeishuMessage>;
   readonly threadMessages: Map<string, readonly MockFeishuMessage[]>;
@@ -84,6 +90,7 @@ export function mockFeishuRuntime(): MockFeishuRuntime {
   const sentTexts: string[] = [];
   const sentCards: unknown[] = [];
   const sentPatches: unknown[] = [];
+  const sentReplies: MockFeishuRuntime["sentReplies"] = [];
   const reactions: Array<{ messageId: string; emoji: string }> = [];
   const readableMessages = new Map<string, MockFeishuMessage>();
   const threadMessages = new Map<string, readonly MockFeishuMessage[]>();
@@ -108,19 +115,21 @@ export function mockFeishuRuntime(): MockFeishuRuntime {
           message: {
             create: async (p: unknown) => {
               const payload = p as { data?: { msg_type?: string; content?: string } };
-              if (payload.data?.msg_type === "interactive") {
-                const card = payload.data.content ? JSON.parse(payload.data.content) : null;
-                sentCards.push(card);
-                const text = textFromCard(card);
-                if (text !== null) sentTexts.push(text);
-              } else {
-                try {
-                  const c = JSON.parse(payload.data?.content ?? "{}") as { text?: string };
-                  sentTexts.push(c.text ?? payload.data?.content ?? "");
-                } catch {
-                  sentTexts.push(payload.data?.content ?? "");
-                }
-              }
+              recordSentMessage(payload.data, sentTexts, sentCards);
+              return { data: { message_id: "mock-msg-id" } };
+            },
+            reply: async (p: unknown) => {
+              const payload = p as {
+                path?: { message_id?: string };
+                data?: { msg_type?: string; content?: string; reply_in_thread?: unknown };
+              };
+              sentReplies.push({
+                messageId: payload.path?.message_id ?? "",
+                msgType: payload.data?.msg_type ?? "",
+                content: payload.data?.content ?? "",
+                replyInThread: payload.data?.reply_in_thread,
+              });
+              recordSentMessage(payload.data, sentTexts, sentCards);
               return { data: { message_id: "mock-msg-id" } };
             },
             patch: async (p: unknown) => {
@@ -153,6 +162,7 @@ export function mockFeishuRuntime(): MockFeishuRuntime {
     sentTexts,
     sentCards,
     sentPatches,
+    sentReplies,
     reactions,
     readableMessages,
     threadMessages,
@@ -160,6 +170,27 @@ export function mockFeishuRuntime(): MockFeishuRuntime {
   return rt;
 }
 
+function recordSentMessage(
+  data: { msg_type?: string; content?: string } | undefined,
+  sentTexts: string[],
+  sentCards: unknown[],
+): void {
+  if (data?.msg_type === "interactive") {
+    const card = data.content ? JSON.parse(data.content) : null;
+    sentCards.push(card);
+    const text = textFromCard(card);
+    if (text !== null) sentTexts.push(text);
+    return;
+  }
+
+  try {
+    const c = JSON.parse(data?.content ?? "{}") as { text?: string };
+    sentTexts.push(c.text ?? data?.content ?? "");
+  } catch {
+    sentTexts.push(data?.content ?? "");
+  }
+}
+
 function textFromCard(card: unknown): string | null {
   if (typeof card !== "object" || card === null) return null;
   const elements = (card as { elements?: unknown }).elements;
diff --git a/hub/test/integration/trigger.test.ts b/hub/test/integration/trigger.test.ts
index df6bd1b..3757f34 100644
--- a/hub/test/integration/trigger.test.ts
+++ b/hub/test/integration/trigger.test.ts
@@ -104,8 +104,9 @@ describe("trigger full lifecycle (integration)", () => {
   it("creates a run, acquires + releases the lock, sends status card", async () => {
     await seedProject("proj-1", "chat-1");
     const trigger = makeTriggerHandler({ prisma, settings, logger: silentLogger, runAgent, messageBatcherOptions: { maxMessages: 1 } });
+    const event = makeEvent("chat-1", "@_user_1 写教案");
 
-    await trigger(makeEvent("chat-1", "@_user_1 写教案"), rt);
+    await trigger(event, rt);
 
     // Wait for the async run to complete (fire-and-forget in trigger).
     await vi.waitFor(async () => {
@@ -122,6 +123,11 @@ describe("trigger full lifecycle (integration)", () => {
 
     // A status card was sent.
     expect(rt.sentCards.length).toBeGreaterThanOrEqual(1);
+    expect(rt.sentReplies[0]).toMatchObject({
+      messageId: event.message.message_id,
+      msgType: "interactive",
+      replyInThread: undefined,
+    });
     expect(rt.sentTexts).toContain("mock response");
     expect(runAgentCalls).toHaveLength(1);
     expect(runAgentCalls[0]?.providerEnv).toMatchObject({
diff --git a/hub/test/unit/feishu-client.test.ts b/hub/test/unit/feishu-client.test.ts
index e5d672b..fa075ce 100644
--- a/hub/test/unit/feishu-client.test.ts
+++ b/hub/test/unit/feishu-client.test.ts
@@ -34,6 +34,23 @@ describe("Feishu client helpers", () => {
     await expect(sendTextMessage(rt, "chat-1", "hello")).resolves.toBe("message-1");
   });
 
+  it("replies to a message without enabling Feishu topic mode", async () => {
+    const messageCreate = vi.fn();
+    const messageReply = vi.fn(async () => ({ data: { message_id: "reply-1" } }));
+    const rt = mockRuntime({ fileCreate: vi.fn(), messageCreate, messageReply });
+
+    await expect(sendTextMessage(rt, "chat-1", "hello", { replyToMessageId: "m-trigger" })).resolves.toBe("reply-1");
+
+    expect(messageCreate).not.toHaveBeenCalled();
+    expect(messageReply).toHaveBeenCalledWith({
+      path: { message_id: "m-trigger" },
+      data: {
+        msg_type: "text",
+        content: JSON.stringify({ text: "hello" }),
+      },
+    });
+  });
+
   it("sends long text in chunks and returns the last successful message id", async () => {
     let messageNumber = 0;
     const messageCreate = vi.fn(async () => ({ data: { message_id: `message-${++messageNumber}` } }));
@@ -70,6 +87,7 @@ describe("Feishu client helpers", () => {
 function mockRuntime(options: {
   readonly fileCreate: (payload: unknown) => Promise<unknown>;
   readonly messageCreate: (payload: unknown) => Promise<unknown>;
+  readonly messageReply?: (payload: unknown) => Promise<unknown>;
   readonly contactBasicBatch?: (payload: unknown) => Promise<unknown>;
   readonly request?: (payload: unknown) => Promise<unknown>;
 }): FeishuRuntime {
@@ -86,7 +104,10 @@ function mockRuntime(options: {
       im: {
         v1: {
           file: { create: options.fileCreate },
-          message: { create: options.messageCreate },
+          message: {
+            create: options.messageCreate,
+            reply: options.messageReply ?? vi.fn(async () => ({ data: { message_id: "reply-1" } })),
+          },
         },
       },
     } as unknown as FeishuRuntime["client"],