diff --git a/packages/mcp/src/generated/catalog.json b/packages/mcp/src/generated/catalog.json
index bb36ca2a..08229002 100644
--- a/packages/mcp/src/generated/catalog.json
+++ b/packages/mcp/src/generated/catalog.json
@@ -6521,6 +6521,10 @@
                     }
                   },
                   "additionalProperties": true
+                },
+                "auto_reply": {
+                  "const": true,
+                  "description": "仅当 QQ 标记该私聊消息为自动回复时提供"
                 }
               },
               "additionalProperties": true
@@ -10710,6 +10714,10 @@
                   }
                 },
                 "additionalProperties": true
+              },
+              "auto_reply": {
+                "const": true,
+                "description": "仅当 QQ 标记该私聊消息为自动回复时提供"
               }
             },
             "additionalProperties": true
diff --git a/packages/mcp/src/generated/catalog.ts b/packages/mcp/src/generated/catalog.ts
index 01031328..a5142323 100644
--- a/packages/mcp/src/generated/catalog.ts
+++ b/packages/mcp/src/generated/catalog.ts
@@ -6524,6 +6524,10 @@ export const ACTIONS: CatalogAction[] = [
                   }
                 },
                 "additionalProperties": true
+              },
+              "auto_reply": {
+                "const": true,
+                "description": "仅当 QQ 标记该私聊消息为自动回复时提供"
               }
             },
             "additionalProperties": true
@@ -10713,6 +10717,10 @@ export const ACTIONS: CatalogAction[] = [
                 }
               },
               "additionalProperties": true
+            },
+            "auto_reply": {
+              "const": true,
+              "description": "仅当 QQ 标记该私聊消息为自动回复时提供"
             }
           },
           "additionalProperties": true
diff --git a/packages/onebot/src/action-result-schemas.ts b/packages/onebot/src/action-result-schemas.ts
index f900272e..77938037 100644
--- a/packages/onebot/src/action-result-schemas.ts
+++ b/packages/onebot/src/action-result-schemas.ts
@@ -62,6 +62,14 @@ export const messageDataSchema = {
     additionalProperties: true,
 } satisfies JsonSchema;
 
+export const messageWithAutoReplySchema = {
+    ...messageDataSchema,
+    properties: {
+        ...messageDataSchema.properties,
+        auto_reply: { const: true, description: '仅当 QQ 标记该私聊消息为自动回复时提供' },
+    },
+} satisfies JsonSchema;
+
 // Forward nodes carry their original identifiers, not locally hashed message IDs.
 export const forwardNodeSchema: JsonSchema = {
     ...messageDataSchema,
diff --git a/packages/onebot/src/actions/extended.ts b/packages/onebot/src/actions/extended.ts
index d026879c..c744b989 100644
--- a/packages/onebot/src/actions/extended.ts
+++ b/packages/onebot/src/actions/extended.ts
@@ -27,6 +27,7 @@ import { GROUP_MESSAGE_EVENT, hashMessageIdInt32 } from '../message-id';
 import {
     messageIdSchema,
     messageDataSchema,
+    messageWithAutoReplySchema,
     forwardNodeSchema,
     messageSegmentSchema,
     mediaInfoSchema,
@@ -1039,7 +1040,7 @@ export const actions = [
                 messages: {
                     type: 'array',
                     description: '消息对象数组；去除 post_type/self_id，附带 real_id',
-                    items: messageDataSchema,
+                    items: messageWithAutoReplySchema,
                 },
             },
             required: ['messages'],
diff --git a/packages/onebot/src/actions/message.ts b/packages/onebot/src/actions/message.ts
index deffb91c..c43b462b 100644
--- a/packages/onebot/src/actions/message.ts
+++ b/packages/onebot/src/actions/message.ts
@@ -2,7 +2,11 @@ import { createLogger } from '@snowluma/common/logger';
 import type { JsonObject, JsonValue } from '../types';
 import { defineAction, groupAction, f, type Field } from '../action-kit';
 import { RETCODE, failedResponse, okResponse } from '../types';
-import { messageResultSchema, messageIdSchema, messageDataSchema } from '../action-result-schemas';
+import {
+    messageResultSchema,
+    messageIdSchema,
+    messageWithAutoReplySchema,
+} from '../action-result-schemas';
 
 /** send_msg only (#426). Some clients send `group_id: ""` on private chats.
  *  Treat that exact empty string as absent. Do not change `f.groupId()`. */
@@ -210,7 +214,7 @@ export const actions = [
         ],
         returnsSchema: {
             allOf: [
-                messageDataSchema,
+                messageWithAutoReplySchema,
                 {
                     type: 'object',
                     properties: {
diff --git a/packages/onebot/src/event-converter/to-message.ts b/packages/onebot/src/event-converter/to-message.ts
index 920b91c8..29722dab 100644
--- a/packages/onebot/src/event-converter/to-message.ts
+++ b/packages/onebot/src/event-converter/to-message.ts
@@ -89,6 +89,10 @@ async function convertPrivateMessage(
         sender,
     };
 
+    if (event.autoReply) {
+        fields.auto_reply = true;
+    }
+
     if (isSelf && sessionId > 0 && sessionId !== ctx.selfId) {
         fields.target_id = sessionId;
     }
diff --git a/packages/onebot/tests/event-converter.test.ts b/packages/onebot/tests/event-converter.test.ts
index b7cf0335..4a2375c7 100644
--- a/packages/onebot/tests/event-converter.test.ts
+++ b/packages/onebot/tests/event-converter.test.ts
@@ -112,6 +112,28 @@ describe('convertEvent — message kinds', () => {
         expect(out!.message_id).toBe(PEER_UIN + 1);
     });
 
+    it.each([makeFriendMessage(PEER_UIN), makeTempMessage(PEER_UIN)])(
+        'exposes only QQ-marked auto replies in $kind',
+        async (event) => {
+            const manual = await convertEvent(bareCtx(), {
+                ...event,
+                elements: [{ type: 'text', text: '[自动回复] 稍后联系' }],
+            });
+            const automatic = await convertEvent(bareCtx(), { ...event, autoReply: true });
+
+            expect(manual).toMatchObject({
+                message: [{ type: 'text', data: { text: '[自动回复] 稍后联系' } }],
+                raw_message: '[自动回复] 稍后联系',
+            });
+            expect(manual).not.toHaveProperty('auto_reply');
+            expect(automatic).toMatchObject({
+                auto_reply: true,
+                message: [{ type: 'text', data: { text: 'hi' } }],
+                raw_message: 'hi',
+            });
+        },
+    );
+
     it('group_message peer → post_type "message", sub_type "normal", group_id set', async () => {
         const out = await convertEvent(bareCtx(), makeGroupMessage(PEER_UIN));
         expect(out!.post_type).toBe('message');
diff --git a/packages/onebot/tests/history-direction.test.ts b/packages/onebot/tests/history-direction.test.ts
index 4ae957ef..5cea8f84 100644
--- a/packages/onebot/tests/history-direction.test.ts
+++ b/packages/onebot/tests/history-direction.test.ts
@@ -137,7 +137,7 @@ describe('history direction plumbing', () => {
     it('uses C2C roaming for an unanchored latest page and ignores a stale local sequence', async () => {
         const fetchRangeHistory = vi.fn(async () => [friendMessage(99999, FRIEND_ID)]);
         const fetchLatestHistory = vi.fn(async () => [
-            friendMessage(63213, FRIEND_ID, 32742),
+            { ...friendMessage(63213, FRIEND_ID, 32742), autoReply: true },
             friendMessage(63214, SELF_ID, 32743),
         ]);
         await messageStore.storeMeta(-222222222, {
@@ -169,6 +169,12 @@ describe('history direction plumbing', () => {
 
         expect(fetchLatestHistory).toHaveBeenCalledWith('u_friend', 20, SELF_ID);
         expect(fetchRangeHistory).not.toHaveBeenCalled();
+        expect(messages[0]).toMatchObject({ auto_reply: true, raw_message: '63213' });
+        expect(messages[1]).not.toHaveProperty('auto_reply');
+        expect(await messageStore.findEvent(Number(messages[0]!.message_id))).toMatchObject({
+            auto_reply: true,
+            raw_message: '63213',
+        });
         expect(
             messages.map((message) => ({
                 sender: message.user_id,
diff --git a/packages/proto-defs/src/message.ts b/packages/proto-defs/src/message.ts
index 31978981..acd901b8 100644
--- a/packages/proto-defs/src/message.ts
+++ b/packages/proto-defs/src/message.ts
@@ -60,6 +60,8 @@ export interface ContentHead {
     sequence?: pb<5, uint_32>;
     timestamp?: pb<6, uint_32>;
     field7?: pb<7, uint_64>;
+    /** QQ sets a nonzero value for automatic replies. */
+    autoReply?: pb<10, uint_32>;
     /** Conversation-wide C2C sequence. Unlike field 5, this advances across
      *  messages sent by either participant and is the sequence accepted by
      *  SsoGetC2cMsg. It is absent on group messages. */
diff --git a/packages/protocol/src/events.ts b/packages/protocol/src/events.ts
index 840abce6..b3ada9e9 100644
--- a/packages/protocol/src/events.ts
+++ b/packages/protocol/src/events.ts
@@ -283,6 +283,7 @@ export interface QQEvent {
 
 export interface FriendMessage extends QQEvent {
     kind: 'friend_message';
+    autoReply?: true;
     senderUin: number;
     /** The other participant in this private conversation. Differs from
      *  senderUin for messages sent by the logged-in account. */
@@ -326,6 +327,7 @@ export interface GroupMessage extends QQEvent {
 
 export interface TempMessage extends QQEvent {
     kind: 'temp_message';
+    autoReply?: true;
     senderUin: number;
     /** Source group of the temp session (from responseHead.forward), or 0. */
     groupId: number;
diff --git a/packages/protocol/src/msg-push/context.ts b/packages/protocol/src/msg-push/context.ts
index 8911b871..38fd2d1f 100644
--- a/packages/protocol/src/msg-push/context.ts
+++ b/packages/protocol/src/msg-push/context.ts
@@ -21,6 +21,7 @@ export interface MsgPushHead {
     readonly c2cCmd: number;
     /** Sender-local C2C client sequence (field 5), or the group sequence. */
     readonly sequence: number;
+    readonly autoReply?: true;
     /** Bidirectional C2C sequence (field 11); zero on groups/legacy packets. */
     readonly ntMsgSeq: number;
     readonly timestamp: number;
@@ -94,6 +95,7 @@ export function buildContextFromMessage(
         subType: msg.contentHead.subType ?? 0,
         c2cCmd: msg.contentHead.c2cCmd ?? 0,
         sequence: msg.contentHead.sequence ?? 0,
+        autoReply: msg.contentHead.autoReply ? true : undefined,
         ntMsgSeq: msg.contentHead.ntMsgSeq ?? 0,
         timestamp: msg.contentHead.timestamp ?? 0,
         msgId: msg.contentHead.msgId ?? 0,
diff --git a/packages/protocol/src/msg-push/decoders/friend-message.ts b/packages/protocol/src/msg-push/decoders/friend-message.ts
index 16d87e5e..598edb31 100644
--- a/packages/protocol/src/msg-push/decoders/friend-message.ts
+++ b/packages/protocol/src/msg-push/decoders/friend-message.ts
@@ -80,6 +80,7 @@ export const decodeFriendMessage: MsgPushDecoder = (ctx) => {
 
     const ev: FriendMessage = {
         kind: 'friend_message',
+        autoReply: ctx.head.autoReply,
         time: ctx.head.timestamp,
         selfUin: ctx.selfUin,
         senderUin: ctx.fromUin,
diff --git a/packages/protocol/src/msg-push/decoders/temp-message.ts b/packages/protocol/src/msg-push/decoders/temp-message.ts
index 90399587..2c61943b 100644
--- a/packages/protocol/src/msg-push/decoders/temp-message.ts
+++ b/packages/protocol/src/msg-push/decoders/temp-message.ts
@@ -6,6 +6,7 @@ export const decodeTempMessage: MsgPushDecoder = (ctx) => {
     const sequenceAuthoritative = ctx.head.ntMsgSeq > 0;
     const ev: TempMessage = {
         kind: 'temp_message',
+        autoReply: ctx.head.autoReply,
         time: ctx.head.timestamp,
         selfUin: ctx.selfUin,
         senderUin: ctx.fromUin,
diff --git a/packages/protocol/tests/msg-push/fetch-c2c-history.test.ts b/packages/protocol/tests/msg-push/fetch-c2c-history.test.ts
index b0edb35f..04b68e32 100644
--- a/packages/protocol/tests/msg-push/fetch-c2c-history.test.ts
+++ b/packages/protocol/tests/msg-push/fetch-c2c-history.test.ts
@@ -18,12 +18,14 @@ import type { IdentityService } from '../../src/identity-service';
 import { buildContextFromMessage } from '../../src/msg-push/context';
 import { decodeFriendMessage } from '../../src/msg-push/decoders/friend-message';
 import {
+    MSG_PUSH_CMD,
     SSO_GET_C2C_MSG_CMD,
     SSO_GET_ROAM_MSG_CMD,
     fetchC2cMessageRange,
     fetchC2cRoamMessagePage,
+    parseMsgPushOrThrow,
 } from '../../src/msg-push';
-import { s, v } from '../oidb-services/_pb-oracle';
+import { m, s, v } from '../oidb-services/_pb-oracle';
 
 const identity = { findFriend: () => undefined } as unknown as IdentityService;
 const previousLogLevel = getLogLevel();
@@ -36,6 +38,52 @@ function okResult(data: Uint8Array): SendPacketResult {
     return { success: true, gotResponse: true, responseData: data } as SendPacketResult;
 }
 
+describe('private auto replies', () => {
+    it.each([
+        { name: 'missing flag', flag: [], text: '稍后联系', expected: undefined },
+        { name: 'explicit zero', flag: v(10, 0), text: '[自动回复] 稍后联系', expected: undefined },
+        { name: 'set flag', flag: v(10, 1), text: '稍后联系', expected: true },
+        { name: 'other nonzero flag', flag: v(10, 2), text: '[自动回复] 稍后联系', expected: true },
+    ])(
+        'decodes $name from a live push and both history responses',
+        async ({ flag, text, expected }) => {
+            const head = [...v(1, 166), ...v(5, 7), ...flag, ...v(11, 42)];
+            const textElement = m(1, s(1, text));
+            const wireMessage = [
+                ...m(1, v(1, 222)),
+                ...m(2, head),
+                ...m(3, m(1, m(2, textElement))),
+            ];
+            const live = parseMsgPushOrThrow(
+                {
+                    pid: 0,
+                    uin: '10001',
+                    serviceCmd: MSG_PUSH_CMD,
+                    seqId: 1,
+                    retCode: 0,
+                    fromClient: false,
+                    body: Buffer.from(m(1, wireMessage)),
+                },
+                identity,
+            );
+            // Both history endpoints carry repeated messages in field 7.
+            const sender = { sendRawPacket: async () => okResult(Buffer.from(m(7, wireMessage))) };
+            const range = await fetchC2cMessageRange(sender, identity, 10001, 'u_friend', 42, 42);
+            const roam = await fetchC2cRoamMessagePage(sender, identity, 10001, 'u_friend', 100, 1);
+
+            for (const messages of [live, range, roam.messages]) {
+                expect(messages).toHaveLength(1);
+                expect(messages[0]).toMatchObject({
+                    kind: 'friend_message',
+                    elements: [{ type: 'text', text }],
+                });
+                const [event] = messages;
+                expect(event.kind === 'friend_message' && event.autoReply).toBe(expected);
+            }
+        },
+    );
+});
+
 function inviteCardMessage(sequence: number): PushMsgBody {
     const json = JSON.stringify({
         app: 'com.tencent.qun.invite',
diff --git a/packages/sdk/MESSAGING.md b/packages/sdk/MESSAGING.md
index 60420de6..3737a2fb 100644
--- a/packages/sdk/MESSAGING.md
+++ b/packages/sdk/MESSAGING.md
@@ -73,6 +73,8 @@ Old `SnowLumaEventContext` objects and explicitly typed handlers remain valid. S
 
 ## Wait for a future event
 
+Private messages marked by QQ as automatic replies carry `auto_reply: true` in live events and friend history. Check `event.auto_reply === true` to filter them. SnowLuma preserves the reply text, including any literal `[自动回复]` the sender typed. Older locally stored messages may lack the flag.
+
 `waitForEvent(predicate?, options?)` and `waitForMessage(predicate?, options?)` are available on the WebSocket client. Both also accept just the options object. Synchronous type-guard predicates narrow the resolved type; boolean predicates filter without claiming a narrower type.
 
 ```ts
diff --git a/packages/sdk/src/types/events.ts b/packages/sdk/src/types/events.ts
index 45184c29..a8cda714 100644
--- a/packages/sdk/src/types/events.ts
+++ b/packages/sdk/src/types/events.ts
@@ -18,6 +18,8 @@ export interface OneBotSender extends JsonObject {
 export interface OneBotPrivateMessageEvent extends OneBotBaseEvent {
     post_type: 'message' | 'message_sent';
     message_type: 'private';
+    /** Present only when QQ marks this message as an automatic reply. */
+    auto_reply?: true;
     sub_type: string;
     message_id: number;
     message_seq?: number;
diff --git a/packages/sdk/src/types/results.ts b/packages/sdk/src/types/results.ts
index a218963a..f7245480 100644
--- a/packages/sdk/src/types/results.ts
+++ b/packages/sdk/src/types/results.ts
@@ -1,3 +1,4 @@
+import type { OneBotPrivateMessageEvent } from './events.js';
 import type { JsonArray, JsonObject, JsonValue } from './json.js';
 
 export interface QzoneCommentReply {
@@ -85,7 +86,7 @@ export interface GroupMessageHistory {
 }
 
 export interface FriendMessageHistory {
-    messages: JsonObject[];
+    messages: Array<JsonObject & Pick<OneBotPrivateMessageEvent, 'auto_reply'>>;
 }
 
 export interface GroupNoticeInfo {