diff --git a/.mocharc.js b/.mocharc.js
index 683fb00e30..bc4e01a4e3 100644
--- a/.mocharc.js
+++ b/.mocharc.js
@@ -7,6 +7,7 @@ const specs = [
   'packages/segment/tests/*.spec.ts',
   'packages/utils/tests/*.spec.ts',
   'plugins/a11y/admin/tests/*.spec.ts',
+  'plugins/a11y/commands/tests/*.spec.ts',
   'plugins/a11y/rate-limit/tests/*.spec.ts',
   'plugins/a11y/schedule/tests/*.spec.ts',
   'plugins/a11y/switch/tests/*.spec.ts',
@@ -25,7 +26,6 @@ const specs = [
   'plugins/database/mysql/tests/*.spec.ts',
   'plugins/database/sqlite/tests/*.spec.ts',
   // 'plugins/eval/tests/*.spec.ts',
-  'plugins/frontend/commands/tests/*.spec.ts',
   // 'plugins/github/tests/*.spec.ts',
   'plugins/teach/tests/*.spec.ts',
 ]
diff --git a/packages/core/src/command.ts b/packages/core/src/command.ts
index e2dd8b2b0b..8185d43676 100644
--- a/packages/core/src/command.ts
+++ b/packages/core/src/command.ts
@@ -75,7 +75,7 @@ export class Command<U extends User.Field = never, G extends Channel.Field = nev
   constructor(name: string, decl: string, context: Context) {
     super(name, decl, context)
     this.config = { ...Command.defaultConfig }
-    this._registerAlias(name.toLowerCase())
+    this._registerAlias(name)
     context.app._commandList.push(this)
   }
 
@@ -83,14 +83,44 @@ export class Command<U extends User.Field = never, G extends Channel.Field = nev
     return this.context.app
   }
 
-  private _registerAlias(name: string) {
-    this._aliases.push(name)
+  get displayName() {
+    return this._aliases[0]
+  }
+
+  set displayName(name) {
+    this._registerAlias(name, true)
+  }
+
+  private _registerAlias(name: string, prepend = false) {
+    name = name.toLowerCase()
+
+    // add to list
+    const done = this._aliases.includes(name)
+    if (done) {
+      if (prepend) {
+        remove(this._aliases, name)
+        this._aliases.unshift(name)
+      }
+      return
+    } else if (prepend) {
+      this._aliases.unshift(name)
+    } else {
+      this._aliases.push(name)
+    }
+
+    // register global
     const previous = this.app.getCommand(name)
     if (!previous) {
       this.app._commands.set(name, this)
     } else if (previous !== this) {
       throw new Error(`duplicate command names: "${name}"`)
     }
+
+    // add disposable
+    this._disposables?.push(() => {
+      remove(this._aliases, name)
+      this.app._commands.delete(name)
+    })
   }
 
   [Symbol.for('nodejs.util.inspect.custom')]() {
@@ -109,14 +139,8 @@ export class Command<U extends User.Field = never, G extends Channel.Field = nev
 
   alias(...names: string[]) {
     if (this._disposed) return this
-    for (const _name of names) {
-      const name = _name.toLowerCase()
-      if (this._aliases.includes(name)) continue
+    for (const name of names) {
       this._registerAlias(name)
-      this._disposables?.push(() => {
-        remove(this._aliases, name)
-        this.app._commands.delete(name)
-      })
     }
     return this
   }
diff --git a/packages/core/src/internal/help.ts b/packages/core/src/internal/help.ts
index 3faa1f4b81..7d8bd77d5d 100644
--- a/packages/core/src/internal/help.ts
+++ b/packages/core/src/internal/help.ts
@@ -97,12 +97,12 @@ function* getCommands(session: Session<'authority'>, commands: Command[], showHi
 function formatCommands(path: string, session: Session<'authority'>, children: Command[], options: HelpOptions) {
   const commands = Array
     .from(getCommands(session, children, options.showHidden))
-    .sort((a, b) => a.name > b.name ? 1 : -1)
+    .sort((a, b) => a.displayName > b.displayName ? 1 : -1)
   if (!commands.length) return []
 
   let hasSubcommand = false
-  const output = commands.map(({ name, config, children }) => {
-    let output = '    ' + name
+  const output = commands.map(({ name, displayName, config, children }) => {
+    let output = '    ' + displayName
     if (options.authority) {
       output += ` (${config.authority}${children.length ? (hasSubcommand = true, '*') : ''})`
     }
@@ -148,7 +148,7 @@ function getOptions(command: Command, session: Session<'authority'>, config: Hel
 }
 
 async function showHelp(command: Command, session: Session<'authority'>, config: HelpOptions) {
-  const output = [command.name + command.declaration]
+  const output = [command.displayName + command.declaration]
 
   const description = session.text([`commands.${command.name}.description`, ''])
   if (description) output.push(description)
@@ -186,7 +186,7 @@ async function showHelp(command: Command, session: Session<'authority'>, config:
     output.push(session.text('.command-examples'), ...command._examples.map(example => '    ' + example))
   } else {
     const text = session.text([`commands.${command.name}.examples`, ''])
-    output.push(...text.split('\n').map(line => '    ' + line))
+    if (text) output.push(...text.split('\n').map(line => '    ' + line))
   }
 
   output.push(...formatCommands('.subcommand-prolog', session, command.children, config))
diff --git a/packages/core/src/parser.ts b/packages/core/src/parser.ts
index 9460beffac..1f4eb7ff8b 100644
--- a/packages/core/src/parser.ts
+++ b/packages/core/src/parser.ts
@@ -378,7 +378,7 @@ export namespace Argv {
     private _namedOptions: OptionDeclarationMap = {}
     private _symbolicOptions: OptionDeclarationMap = {}
 
-    constructor(public name: string, declaration: string, public context: Context) {
+    constructor(public readonly name: string, declaration: string, public context: Context) {
       if (!name) throw new Error('expect a command name')
       const decl = this._arguments = parseDecl(declaration)
       this.declaration = decl.stripped
diff --git a/plugins/a11y/commands/src/index.ts b/plugins/a11y/commands/src/index.ts
index 89fc783f7f..1b2816a447 100644
--- a/plugins/a11y/commands/src/index.ts
+++ b/plugins/a11y/commands/src/index.ts
@@ -76,8 +76,7 @@ export function apply(ctx: Context, config: Dict<Config>) {
       const _name = locate(target, name)
       if (!_name) return
       // directly modify name of prototype
-      target.name = _name
-      command.alias(_name)
+      command.displayName = _name
     }
 
     for (const name of config.alias) {
diff --git a/plugins/a11y/commands/tests/index.spec.ts b/plugins/a11y/commands/tests/index.spec.ts
index 8ed367bafe..5b00636459 100644
--- a/plugins/a11y/commands/tests/index.spec.ts
+++ b/plugins/a11y/commands/tests/index.spec.ts
@@ -33,7 +33,7 @@ describe('@koishijs/plugin-override', () => {
       await client.shouldNotReply('bar')
       await client.shouldNotReply('baz')
 
-      await app.dispose(commands)
+      app.dispose(commands)
     })
 
     it('dispose plugin', async () => {
@@ -49,7 +49,7 @@ describe('@koishijs/plugin-override', () => {
       await client.shouldReply('bar', 'test')
       await client.shouldReply('baz', 'test')
 
-      await app.dispose(commands)
+      app.dispose(commands)
 
       await client.shouldReply('bar', 'test')
       await client.shouldNotReply('baz')
@@ -72,7 +72,7 @@ describe('@koishijs/plugin-override', () => {
       await client.shouldReply('foo.bar', 'test')
       await client.shouldReply('baz', 'test')
 
-      await app.dispose(commands)
+      app.dispose(commands)
       await client.shouldReply('foo.bar', 'test')
       await client.shouldNotReply('baz')
       expect(foo.children).to.have.length(1)
@@ -94,7 +94,7 @@ describe('@koishijs/plugin-override', () => {
       await client.shouldReply('bar', 'test')
       await client.shouldReply('baz', 'test')
 
-      await app.dispose(commands)
+      app.dispose(commands)
       await client.shouldReply('bar', 'test')
       await client.shouldNotReply('baz')
       expect(foo.children).to.have.length(0)
@@ -118,7 +118,7 @@ describe('@koishijs/plugin-override', () => {
       expect(baz.children).to.have.length(1)
       await client.shouldReply('foo', 'test')
 
-      await app.dispose(commands)
+      app.dispose(commands)
       await client.shouldReply('foo', 'test')
       expect(bar.children).to.have.length(1)
       expect(baz.children).to.have.length(0)
@@ -143,7 +143,7 @@ describe('@koishijs/plugin-override', () => {
       await client.shouldReply('foo', /baz/)
       await client.shouldReply('baz', 'test')
 
-      await app.dispose(commands)
+      app.dispose(commands)
       await client.shouldNotReply('foo')
       await client.shouldNotReply('baz')
       await client.shouldReply('bar', 'test')