diff --git a/packages/adapter-cqhttp/src/api.ts b/packages/adapter-cqhttp/src/api.ts
index c0bbe56fa0..24198cfea5 100644
--- a/packages/adapter-cqhttp/src/api.ts
+++ b/packages/adapter-cqhttp/src/api.ts
@@ -318,6 +318,7 @@ defineAsync('set_group_anonymous', 'group_id', 'enable')
 defineAsync('set_group_card', 'group_id', 'user_id', 'card')
 defineAsync('set_group_leave', 'group_id', 'is_dismiss')
 defineAsync('set_group_special_title', 'group_id', 'user_id', 'special_title', 'duration')
+defineSync('get_msg', 'message_id')
 defineSync('get_login_info')
 defineSync('get_stranger_info', 'user_id', 'no_cache')
 defineSync('get_friend_list')
diff --git a/packages/koishi-core/src/server.ts b/packages/koishi-core/src/server.ts
index d16592abb3..ed07356d95 100644
--- a/packages/koishi-core/src/server.ts
+++ b/packages/koishi-core/src/server.ts
@@ -1,5 +1,5 @@
 import { camelCase, paramCase, sleep } from 'koishi-utils'
-import { Session, MessageType, Meta } from './session'
+import { Session, MessageType, Meta, MessageInfo } from './session'
 import { App, AppStatus } from './app'
 import * as http from 'http'
 import type Koa from 'koa'
@@ -112,6 +112,7 @@ export enum BotStatusCode {
 export interface Bot extends BotOptions {
   ready?: boolean
   version?: string
+  getMsg(messageId: number): Promise<MessageInfo>
   getSelfId(): Promise<number>
   getStatusCode(): Promise<BotStatusCode>
   getMemberMap(groupId: number): Promise<Record<number, string>>