diff --git a/packages/core/src/app.ts b/packages/core/src/app.ts
index f47c666d92..6dcaaf7aee 100644
--- a/packages/core/src/app.ts
+++ b/packages/core/src/app.ts
@@ -55,7 +55,7 @@ export class App extends Context {
       if (!key) return
       const segments = key.split('.')
       let i = 1, name = segments[0], cmd: Command
-      while ((cmd = this._commands.get(name)) && i < segments.length) {
+      while ((cmd = this.getCommand(name)) && i < segments.length) {
         name = cmd.name + '.' + segments[i++]
       }
       return cmd
diff --git a/packages/core/src/command.ts b/packages/core/src/command.ts
index 57c2c63991..f72263fd04 100644
--- a/packages/core/src/command.ts
+++ b/packages/core/src/command.ts
@@ -104,7 +104,7 @@ export class Command<U extends User.Field = never, G extends Channel.Field = nev
 
   private _registerAlias(name: string) {
     this._aliases.push(name)
-    const previous = this.app._commands.get(name)
+    const previous = this.app.getCommand(name)
     if (!previous) {
       this.app._commands.set(name, this)
     } else if (previous !== this) {
diff --git a/packages/core/src/context.ts b/packages/core/src/context.ts
index 6d9b6b3f6f..a8b355c653 100644
--- a/packages/core/src/context.ts
+++ b/packages/core/src/context.ts
@@ -486,6 +486,10 @@ export class Context {
     return this.createTimerDispose(setInterval(callback, ms, ...args))
   }
 
+  getCommand(name: string) {
+    return this.app._commands.get(name)
+  }
+
   command<D extends string>(def: D, config?: Command.Config): Command<never, never, Argv.ArgumentType<D>>
   command<D extends string>(def: D, desc: string, config?: Command.Config): Command<never, never, Argv.ArgumentType<D>>
   command(def: string, ...args: [Command.Config?] | [string, Command.Config?]) {
@@ -500,7 +504,7 @@ export class Context {
     segments.forEach((segment, index) => {
       const code = segment.charCodeAt(0)
       const name = code === 46 ? parent.name + segment : code === 47 ? segment.slice(1) : segment
-      let command = this.app._commands.get(name)
+      let command = this.getCommand(name)
       if (command) {
         if (parent) {
           if (command === parent) {
diff --git a/packages/core/src/internal/help.ts b/packages/core/src/internal/help.ts
index 9f02292382..0f78f43f2f 100644
--- a/packages/core/src/internal/help.ts
+++ b/packages/core/src/internal/help.ts
@@ -17,15 +17,7 @@ export interface HelpConfig extends Command.Config {
 }
 
 export function enableHelp<U extends User.Field, G extends Channel.Field, A extends any[], O extends {}>(cmd: Command<U, G, A, O>) {
-  return cmd
-    .option('help', '-h  显示此信息', { hidden: true })
-    .before(async ({ session, options }, ...args) => {
-      if (cmd['_actions'].length && !options['help']) return
-      return session.execute({
-        name: 'help',
-        args: [cmd.name],
-      })
-    })
+  return cmd.option('help', '-h  显示此信息', { hidden: true })
 }
 
 export default function help(ctx: Context, config: HelpConfig = {}) {
@@ -73,7 +65,7 @@ export default function help(ctx: Context, config: HelpConfig = {}) {
           prefix: template('internal.help-suggestion-prefix'),
           suffix: template('internal.help-suggestion-suffix'),
           async apply(suggestion) {
-            return showHelp(app._commands.get(suggestion), this as any, options)
+            return showHelp(ctx.getCommand(suggestion), this as any, options)
           },
         })
         return
diff --git a/packages/core/src/internal/runtime.ts b/packages/core/src/internal/runtime.ts
index 1a4727d312..e41a4efa9c 100644
--- a/packages/core/src/internal/runtime.ts
+++ b/packages/core/src/internal/runtime.ts
@@ -1,6 +1,7 @@
 import { defineProperty, template, valueMap } from '@koishijs/utils'
 import { Argv } from '../parser'
 import { Context } from '../context'
+import { Session } from '../session'
 import { getCommandNames } from './help'
 
 export default function runtime(ctx: Context) {
@@ -83,4 +84,28 @@ export default function runtime(ctx: Context) {
       },
     })
   })
+
+  function executeHelp(session: Session, name: string) {
+    if (!ctx.getCommand('help')) return
+    return session.execute({
+      name: 'help',
+      args: [name],
+    })
+  }
+
+  ctx.before('command/execute', (argv) => {
+    const { args, command, options, session } = argv
+    if (options['help'] && command._options.help) {
+      return executeHelp(session, command.name)
+    }
+
+    if (command['_actions'].length) return
+    const arg0 = args.shift() || ''
+    const subcommand = ctx.getCommand(command.name + '.' + arg0)
+    if (subcommand) {
+      return session.execute({ ...argv, command: subcommand })
+    } else {
+      return executeHelp(session, command.name)
+    }
+  })
 }
diff --git a/packages/core/src/session.ts b/packages/core/src/session.ts
index afc702471f..856bc16ace 100644
--- a/packages/core/src/session.ts
+++ b/packages/core/src/session.ts
@@ -340,7 +340,7 @@ export class Session<U extends User.Field = never, G extends Channel.Field = nev
       }
       if (!this.resolve(argv)) return ''
     } else {
-      argv.command ||= this.app._commands.get(argv.name)
+      argv.command ||= this.app.getCommand(argv.name)
       if (!argv.command) {
         logger.warn(new Error(`cannot find command ${argv.name}`))
         return ''
diff --git a/packages/core/tests/help.spec.ts b/packages/core/tests/help.spec.ts
index dc61b977ea..2eaa3a35e1 100644
--- a/packages/core/tests/help.spec.ts
+++ b/packages/core/tests/help.spec.ts
@@ -138,7 +138,7 @@ describe('Help Command', () => {
   it('disable help command', async () => {
     const app = new App({ help: false })
     app.plugin(mock)
-    app.command('foo')
+    app.command('foo').action(() => {})
     await app.start()
 
     const client = app.mock.client('123')
@@ -149,7 +149,7 @@ describe('Help Command', () => {
   it('disable help options', async () => {
     const app = new App({ help: { options: false } })
     app.plugin(mock)
-    app.command('foo')
+    app.command('foo').action(() => {})
     await app.start()
 
     const client = app.mock.client('123')
diff --git a/plugins/common/forward/src/index.ts b/plugins/common/forward/src/index.ts
index fb2a2eaf4d..330698e988 100644
--- a/plugins/common/forward/src/index.ts
+++ b/plugins/common/forward/src/index.ts
@@ -1,4 +1,4 @@
-import { Context, Session, Dict, Time, template, Schema } from 'koishi'
+import { Context, Session, Dict, Time, template, Schema, Command } from 'koishi'
 import { parsePlatform } from '@koishijs/helpers'
 
 declare module 'koishi' {
@@ -95,48 +95,46 @@ export function apply(ctx: Context, { rules, interval }: Config) {
   })
 
   ctx.using(['database'], (ctx) => {
-    ctx.command('forward <channel:channel>', '设置消息转发', { authority: 3, checkUnknown: true })
-      .channelFields(['forward'])
-      .option('add', '-a  添加目标频道')
-      .option('delete', '-d  移除目标频道')
-      .option('clear', '-c  移除全部目标频道')
-      .option('list', '-l  查看目标频道列表')
+    const cmd = ctx
+      .command('forward [operation:string] <channel:channel>', '设置消息转发', { authority: 3 })
       .usage(session => `当前频道 ID：${session.cid}`)
-      .before(async ({ session, options }, id) => {
-        if (options.add || options.delete) {
-          return id ? null : '请提供目标频道。'
-        } else if (Object.keys(options).length) {
-          return
-        }
-        return session.execute({
-          name: 'help',
-          args: ['forward'],
-        })
-      })
-      .action(async ({ session, options }, id) => {
-        const { forward } = session.channel
-        if (options.add) {
-          if (forward.includes(id)) {
-            return `${id} 已经是当前频道的目标频道。`
-          } else {
-            forward.push(id)
-            return `已成功添加目标频道 ${id}。`
-          }
-        } else if (options.delete) {
-          const index = forward.indexOf(id)
-          if (index >= 0) {
-            forward.splice(index, 1)
-            return `已成功移除目标频道 ${id}。`
-          } else {
-            return `${id} 不是当前频道的目标频道。`
-          }
-        } else if (options.clear) {
-          session.channel.forward = []
-          return '已成功移除全部目标频道。'
-        } else if (options.list) {
-          if (!forward.length) return '当前频道没有设置目标频道。'
-          return ['当前频道的目标频道列表为：', ...forward].join('\n')
-        }
-      })
+      .alias('fwd')
+
+    const register = (def: string, desc: string, callback: Command.Action<never, 'forward', [string]>) => cmd
+      .subcommand(def, desc, { authority: 3, checkArgCount: true })
+      .channelFields(['forward'])
+      .action(callback)
+
+    register('.add <channel:channel>', '添加目标频道', async ({ session }, id) => {
+      const { forward } = session.channel
+      if (forward.includes(id)) {
+        return `${id} 已经是当前频道的目标频道。`
+      } else {
+        forward.push(id)
+        return `已成功添加目标频道 ${id}。`
+      }
+    })
+
+    register('.remove <channel:channel>', '移除目标频道', async ({ session }, id) => {
+      const { forward } = session.channel
+      const index = forward.indexOf(id)
+      if (index >= 0) {
+        forward.splice(index, 1)
+        return `已成功移除目标频道 ${id}。`
+      } else {
+        return `${id} 不是当前频道的目标频道。`
+      }
+    }).alias('forward.rm')
+
+    register('.clear', '移除全部目标频道', async ({ session }) => {
+      session.channel.forward = []
+      return '已成功移除全部目标频道。'
+    })
+
+    register('.list', '查看目标频道列表', async ({ session }) => {
+      const { forward } = session.channel
+      if (!forward.length) return '当前频道没有设置目标频道。'
+      return ['当前频道的目标频道列表为：', ...forward].join('\n')
+    }).alias('forward.ls')
   })
 }
diff --git a/plugins/common/forward/tests/index.spec.ts b/plugins/common/forward/tests/index.spec.ts
index 8cc7059d74..a1c0bf5218 100644
--- a/plugins/common/forward/tests/index.spec.ts
+++ b/plugins/common/forward/tests/index.spec.ts
@@ -50,10 +50,10 @@ describe('@koishijs/plugin-forward', () => {
     await app.mock.initUser('123', 3)
 
     await session2.shouldReply('forward', /设置消息转发/)
-    await session2.shouldReply('forward -a #123', '已成功添加目标频道 mock:123。')
-    await session2.shouldReply('forward -l', '当前频道的目标频道列表为：\nmock:123')
-    await session2.shouldReply('forward -d #123', '已成功移除目标频道 mock:123。')
-    await session2.shouldReply('forward -l', '当前频道没有设置目标频道。')
-    await session2.shouldReply('forward -c', '已成功移除全部目标频道。')
+    await session2.shouldReply('forward add #123', '已成功添加目标频道 mock:123。')
+    await session2.shouldReply('forward ls', '当前频道的目标频道列表为：\nmock:123')
+    await session2.shouldReply('forward rm #123', '已成功移除目标频道 mock:123。')
+    await session2.shouldReply('forward ls', '当前频道没有设置目标频道。')
+    await session2.shouldReply('forward clear', '已成功移除全部目标频道。')
   })
 })