diff --git a/cli/CHANGELOG.md b/cli/CHANGELOG.md
index e762f7d9..20cb5cf8 100644
--- a/cli/CHANGELOG.md
+++ b/cli/CHANGELOG.md
@@ -6,6 +6,8 @@ All notable CLI behavior changes are documented in this file.
 
 ### Added
 
+- Add the user-level `astudio` agent profile, displayed as AStudio, with automatic detection of
+  `~/.acode/skills` on Linux, macOS, and Windows.
 - Add repeatable `sync pull --skill <slug>` selection for non-interactive and JSON workflows, with
   interactive multi-select in a TTY.
 - Add `skillhub upgrade <coordinate...>` for bounded, explicit upgrades of already-installed Skills,
diff --git a/cli/README.md b/cli/README.md
index 8841e61c..42192b13 100644
--- a/cli/README.md
+++ b/cli/README.md
@@ -169,6 +169,9 @@ skillhub install pdf-parser --version 1.2.0
 # Install to specific Agent
 skillhub install pdf-parser --agent codex
 
+# Install to AStudio's fixed user-level directory
+skillhub install pdf-parser --agent astudio
+
 # Install to multiple Agents
 skillhub install pdf-parser --agent codex --agent claude-code
 
@@ -197,10 +200,11 @@ The CLI determines the installation location using the following logic:
 
 ### Install Paths
 
-Each Agent has both project-level and user-level skills directories. Use `--scope user|project` to control which one is used.
+Most Agents have both project-level and user-level skills directories. Use `--scope user|project` to control which one is used. AStudio uses its fixed user-level directory only.
 
 | Agent | Project-level Path | User-level Path |
 |-------|-------------------|-----------------|
+| `astudio` (AStudio) | Not supported | `~/.acode/skills/` |
 | `claude-code` | `<project>/.claude/skills/` | `~/.claude/skills/` |
 | `codex` | `<project>/.codex/skills/` | `~/.codex/skills/` |
 | `cursor` | `<project>/.cursor/skills/` | `~/.cursor/skills/` |
@@ -217,7 +221,7 @@ Each Agent has both project-level and user-level skills directories. Use `--scop
 | `kilo` | `<project>/.kilo/skills/` | `~/.kilo/skills/` |
 | _fallback_ | `<project>/.agents/skills/` | `~/.agents/skills/` |
 
-For a custom path or an unsupported Agent directory, use `--dir` to specify the installation path. In interactive user scope, the `generic` target is offered alongside detected Agent targets. When `--scope user|project` finds no matching agent directory, the CLI falls back to the `_fallback_` row above.
+For a custom path or an unsupported Agent directory, use `--dir` to specify the installation path. In interactive user scope, the `generic` target is offered alongside detected Agent targets. AStudio appears in that selector when `~/.acode/skills/` exists. When `--scope user|project` finds no matching agent directory, the CLI falls back to the `_fallback_` row above.
 
 ### File Structure After Installation
 
diff --git a/cli/src/agents/detector.ts b/cli/src/agents/detector.ts
index 55a17d75..50abff75 100644
--- a/cli/src/agents/detector.ts
+++ b/cli/src/agents/detector.ts
@@ -1,4 +1,5 @@
 import type { AgentProfile } from './types'
+import { aStudioProfile } from './profiles/astudio'
 import { claudeCodeProfile } from './profiles/claude-code'
 import { codexProfile } from './profiles/codex'
 import { cursorProfile } from './profiles/cursor'
@@ -15,14 +16,14 @@ import { opencodeProfile } from './profiles/opencode'
 import { kiloProfile } from './profiles/kilo'
 
 export {
-  claudeCodeProfile, codexProfile, cursorProfile, githubCopilotProfile,
+  aStudioProfile, claudeCodeProfile, codexProfile, cursorProfile, githubCopilotProfile,
   geminiCliProfile, openhandsProfile, windsurfProfile, openclawProfile,
   kiroCliProfile, rooProfile, traeProfile, traeCnProfile,
   opencodeProfile, kiloProfile
 }
 
 export const allProfiles: AgentProfile[] = [
-  claudeCodeProfile, codexProfile, cursorProfile, githubCopilotProfile,
+  aStudioProfile, claudeCodeProfile, codexProfile, cursorProfile, githubCopilotProfile,
   geminiCliProfile, openhandsProfile, windsurfProfile, openclawProfile,
   kiroCliProfile, rooProfile, traeProfile, traeCnProfile,
   opencodeProfile, kiloProfile
diff --git a/cli/src/agents/profiles/astudio.ts b/cli/src/agents/profiles/astudio.ts
new file mode 100644
index 00000000..ed3232e0
--- /dev/null
+++ b/cli/src/agents/profiles/astudio.ts
@@ -0,0 +1,23 @@
+import { directoryExists } from '../../platform/paths'
+import type { AgentProfile } from '../types'
+
+function userSkillsRoot(home: string): string {
+  return home.replace(/\\/g, '/').replace(/\/+$/, '') + '/.acode/skills'
+}
+
+export const aStudioProfile: AgentProfile = {
+  id: 'astudio',
+  displayName: 'AStudio',
+  projectRoots: () => [],
+  userRoots: home => [userSkillsRoot(home)],
+  async detectInstalled(_cwd, home) {
+    const rootDir = userSkillsRoot(home)
+    if (!await directoryExists(rootDir)) return []
+    return [{
+      agent: this.id,
+      rootDir,
+      scope: 'user',
+      source: 'detected'
+    }]
+  }
+}
diff --git a/cli/src/agents/profiles/make-profile.ts b/cli/src/agents/profiles/make-profile.ts
index 88d2e7ad..89c69844 100644
--- a/cli/src/agents/profiles/make-profile.ts
+++ b/cli/src/agents/profiles/make-profile.ts
@@ -1,10 +1,6 @@
-import { pathExists } from '../../platform/paths'
+import { directoryExists } from '../../platform/paths'
 import type { AgentProfile, AgentCandidate } from '../types'
 
-async function dirExists(path: string): Promise<boolean> {
-  return pathExists(path)
-}
-
 export function makeProfile(id: string, displayName: string, projectSkills: string, userSkills: string): AgentProfile {
   return {
     id,
@@ -15,7 +11,7 @@ export function makeProfile(id: string, displayName: string, projectSkills: stri
       const roots = [...this.projectRoots(cwd), ...this.userRoots(home)]
       const results: AgentCandidate[] = []
       for (const root of roots) {
-        if (await dirExists(root)) {
+        if (await directoryExists(root)) {
           results.push({
             agent: this.id,
             rootDir: root,
diff --git a/cli/src/agents/resolver.ts b/cli/src/agents/resolver.ts
index 190e1a8d..7d095bfe 100644
--- a/cli/src/agents/resolver.ts
+++ b/cli/src/agents/resolver.ts
@@ -1,7 +1,7 @@
 import { homedir } from 'node:os'
 import { CliError } from '../shared/errors'
 import { EXIT } from '../shared/constants'
-import { canonicalizeExistingPath, pathExists } from '../platform/paths'
+import { canonicalizeExistingPath, directoryExists } from '../platform/paths'
 import type { AgentCandidate } from './types'
 import { allProfiles, profileMap } from './detector'
 
@@ -105,7 +105,7 @@ async function generateScopedCandidates(
   for (const profile of allProfiles) {
     const roots = scope === 'user' ? profile.userRoots(home) : profile.projectRoots(cwd)
     for (const root of roots) {
-      if (await pathExists(root)) {
+      if (await directoryExists(root)) {
         results.push({ agent: profile.id, rootDir: root, scope, source: 'detected' })
       }
     }
@@ -145,6 +145,11 @@ async function resolveExplicitAgents(
       const userRoots = home ? profile.userRoots(home) : []
       roots = userRoots.length > 0 ? userRoots : profile.projectRoots(cwd)
     }
+    if (roots.length === 0) {
+      throw new CliError(`agent ${agentId} does not support ${scope} scope`, EXIT.usage, {
+        next: 'choose a supported scope or omit --scope'
+      })
+    }
     const userRootSet = new Set(home ? profile.userRoots(home) : [])
     for (const root of roots) {
       const candidateScope: AgentCandidate['scope'] = scope !== undefined
@@ -183,7 +188,7 @@ async function selectTargetsInteractively(candidates: AgentCandidate[]): Promise
     name: 'selected',
     message: 'Select install targets',
     choices: candidates.map(c => ({
-      title: `${c.agent} (${c.rootDir})`,
+      title: `${profileMap.get(c.agent)?.displayName ?? c.agent} (${c.rootDir})`,
       value: c
     })),
     onRender: function (this: { cursor?: number }) {
diff --git a/cli/src/platform/paths.ts b/cli/src/platform/paths.ts
index 7811a766..6e83d8a2 100644
--- a/cli/src/platform/paths.ts
+++ b/cli/src/platform/paths.ts
@@ -24,6 +24,15 @@ export async function pathExists(path: string): Promise<boolean> {
   }
 }
 
+export async function directoryExists(path: string): Promise<boolean> {
+  const { stat } = await import('node:fs/promises')
+  try {
+    return (await stat(path)).isDirectory()
+  } catch {
+    return false
+  }
+}
+
 export async function canonicalizeExistingPath(path: string): Promise<string> {
   const { realpath } = await import('node:fs/promises')
   try {
diff --git a/cli/test/integration/install-command.test.ts b/cli/test/integration/install-command.test.ts
index 9687e60a..f6b6f21c 100644
--- a/cli/test/integration/install-command.test.ts
+++ b/cli/test/integration/install-command.test.ts
@@ -667,6 +667,49 @@ describe('install command — server errors', () => {
 // ---------------------------------------------------------------------------
 
 describe('install command — multi-agent & auto-detect', () => {
+  test('--agent astudio installs and persists the stable lowercase agent id', async () => {
+    const env = await createTempHome()
+    registry = await startFakeRegistry({
+      token: 'sk_ok',
+      user: { handle: 'u', displayName: 'U' },
+      skills: [{ namespace: 'global', slug: 'pdf-parser', version: '1.0.0', zipBytes: makeSkillZip() }]
+    })
+    await runCli(['login', '--registry', registry.url, '--token', 'sk_ok'], { HOME: env.home, USERPROFILE: env.home })
+
+    const result = await runCli(
+      [
+        'install', 'pdf-parser',
+        '--agent', 'astudio',
+        '--registry', registry.url,
+        '--token', 'sk_ok',
+        '--json'
+      ],
+      { HOME: env.home, USERPROFILE: env.home }
+    )
+
+    expect(result.exitCode).toBe(0)
+    const parsed = JSON.parse(result.stdout) as { installed: Array<{ agent: string; dir: string }> }
+    expect(parsed.installed).toEqual([{
+      agent: 'astudio',
+      dir: join(env.home, '.acode', 'skills', 'pdf-parser')
+    }])
+    const metadataPath = join(
+      env.home,
+      '.acode',
+      'skills',
+      'pdf-parser',
+      '.skillhub',
+      'metadata.json'
+    )
+    expect(await Bun.file(metadataPath).exists()).toBe(true)
+    expect(JSON.parse(await readFile(metadataPath, 'utf-8')).agent).toBe('astudio')
+
+    const inventory = JSON.parse(await readFile(join(env.home, '.skillhub', 'inventory.json'), 'utf-8')) as {
+      items: Array<{ targets: Array<{ agent: string }> }>
+    }
+    expect(inventory.items[0]?.targets[0]?.agent).toBe('astudio')
+  })
+
   test('multi --agent installs the same skill into every specified user-level dir', async () => {
     const env = await createTempHome()
     registry = await startFakeRegistry({
diff --git a/cli/test/unit/agents/profiles.test.ts b/cli/test/unit/agents/profiles.test.ts
index a93d0e8e..ec567fe7 100644
--- a/cli/test/unit/agents/profiles.test.ts
+++ b/cli/test/unit/agents/profiles.test.ts
@@ -1,9 +1,12 @@
+import { mkdir, mkdtemp, rm, writeFile } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
 import { describe, expect, test } from 'bun:test'
 import { allProfiles, profileMap } from '../../../src/agents/detector'
 
 describe('agent profiles', () => {
-  test('has 14 tier 1 profiles', () => {
-    expect(allProfiles).toHaveLength(14)
+  test('has 15 tier 1 profiles', () => {
+    expect(allProfiles).toHaveLength(15)
   })
 
   test('all profiles have unique ids', () => {
@@ -12,7 +15,8 @@ describe('agent profiles', () => {
   })
 
   test('profileMap contains all profiles', () => {
-    expect(profileMap.size).toBe(14)
+    expect(profileMap.size).toBe(15)
+    expect(profileMap.has('astudio')).toBe(true)
     expect(profileMap.has('claude-code')).toBe(true)
     expect(profileMap.has('codex')).toBe(true)
     expect(profileMap.has('cursor')).toBe(true)
@@ -35,4 +39,41 @@ describe('agent profiles', () => {
     const profile = profileMap.get('cursor')!
     expect(profile.projectRoots('/repo')).toEqual(['/repo/.cursor/skills'])
   })
+
+  test('AStudio exposes only its fixed user-level directory on Linux, macOS, and Windows', () => {
+    const profile = profileMap.get('astudio')!
+
+    expect(profile.displayName).toBe('AStudio')
+    expect(profile.projectRoots('/repo')).toEqual([])
+    expect(profile.userRoots('/home/alice')).toEqual(['/home/alice/.acode/skills'])
+    expect(profile.userRoots('/Users/alice')).toEqual(['/Users/alice/.acode/skills'])
+    expect(profile.userRoots('C:\\Users\\alice')).toEqual(['C:/Users/alice/.acode/skills'])
+  })
+
+  test('AStudio is detected only when the user .acode skills directory exists', async () => {
+    const home = await mkdtemp(join(tmpdir(), 'skillhub-astudio-home-'))
+    const profile = profileMap.get('astudio')!
+    const nativeRootDir = join(home, '.acode', 'skills')
+    const profileRootDir = nativeRootDir.replace(/\\/g, '/')
+
+    try {
+      expect(await profile.detectInstalled('/repo', home)).toEqual([])
+
+      await mkdir(join(home, '.acode'), { recursive: true })
+      await writeFile(nativeRootDir, 'not a directory')
+      expect(await profile.detectInstalled('/repo', home)).toEqual([])
+
+      await rm(nativeRootDir)
+      await mkdir(nativeRootDir, { recursive: true })
+
+      expect(await profile.detectInstalled('/repo', home)).toEqual([{
+        agent: 'astudio',
+        rootDir: profileRootDir,
+        scope: 'user',
+        source: 'detected'
+      }])
+    } finally {
+      await rm(home, { recursive: true, force: true })
+    }
+  })
 })
diff --git a/cli/test/unit/agents/resolver-interactive.test.ts b/cli/test/unit/agents/resolver-interactive.test.ts
index f669f80d..d2fdeb37 100644
--- a/cli/test/unit/agents/resolver-interactive.test.ts
+++ b/cli/test/unit/agents/resolver-interactive.test.ts
@@ -1,7 +1,11 @@
+import { mkdir, mkdtemp, rm, writeFile } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
 import { afterEach, describe, expect, mock, test } from 'bun:test'
 import type { AgentCandidate } from '../../../src/agents/types'
 
 interface PromptChoice {
+  title: string
   value: AgentCandidate
 }
 
@@ -13,9 +17,11 @@ interface PromptOptions {
 
 const defaultSelectedTargets = (options: PromptOptions): AgentCandidate[] => options.format?.([]) ?? []
 let selectPromptTargets = defaultSelectedTargets
+let renderedChoices: PromptChoice[] = []
 
 mock.module('prompts', () => ({
   default: (options: PromptOptions) => {
+    renderedChoices = options.choices ?? []
     options.onRender?.call({ cursor: 1 })
     return { selected: selectPromptTargets(options) }
   }
@@ -23,11 +29,62 @@ mock.module('prompts', () => ({
 
 afterEach(() => {
   selectPromptTargets = defaultSelectedTargets
+  renderedChoices = []
 })
 
 const { resolveInstallTargets } = await import('../../../src/agents/resolver')
 
 describe('resolveInstallTargets interactive prompt', () => {
+  test('renders AStudio by display name when its directory was detected', async () => {
+    const home = await mkdtemp(join(tmpdir(), 'skillhub-astudio-resolver-'))
+    const nativeRootDir = join(home, '.acode', 'skills')
+    const profileRootDir = nativeRootDir.replace(/\\/g, '/')
+
+    try {
+      await mkdir(nativeRootDir, { recursive: true })
+      await resolveInstallTargets({
+        cwd: '/repo',
+        home,
+        agents: [],
+        scope: 'user',
+        json: false,
+        interactive: true
+      })
+
+      expect(renderedChoices[0]?.title).toBe(`AStudio (${profileRootDir})`)
+    } finally {
+      await rm(home, { recursive: true, force: true })
+    }
+  })
+
+  test('does not render AStudio when .acode skills is a regular file', async () => {
+    const home = await mkdtemp(join(tmpdir(), 'skillhub-astudio-file-'))
+    const rootDir = join(home, '.acode', 'skills')
+
+    try {
+      await mkdir(join(home, '.acode'), { recursive: true })
+      await writeFile(rootDir, 'not a directory')
+      const targets = await resolveInstallTargets({
+        cwd: '/repo',
+        home,
+        agents: [],
+        scope: 'user',
+        json: false,
+        interactive: true
+      })
+
+      expect(renderedChoices.some(choice => choice.value.agent === 'astudio')).toBe(false)
+      expect(targets).toEqual([{
+        agent: 'generic',
+        rootDir: `${home}/.agents/skills`,
+        scope: 'user',
+        source: 'fallback'
+      }])
+    } finally {
+      await rm(home, { recursive: true, force: true })
+    }
+  })
+
   test('uses the highlighted target when Enter submits an empty multiselect', async () => {
     const detected: AgentCandidate[] = [
       { agent: 'codex', rootDir: '/repo/.codex/skills', scope: 'project', source: 'detected' },
diff --git a/cli/test/unit/agents/resolver.test.ts b/cli/test/unit/agents/resolver.test.ts
index 96eda770..2f1e8748 100644
--- a/cli/test/unit/agents/resolver.test.ts
+++ b/cli/test/unit/agents/resolver.test.ts
@@ -128,6 +128,17 @@ describe('resolveInstallTargets', () => {
     expect(targets).toEqual([{ agent: 'codex', rootDir: '/repo/.codex/skills', scope: 'project', source: 'explicit' }])
   })
 
+  test('rejects project scope for the user-only AStudio profile', async () => {
+    await expect(resolveInstallTargets({
+      cwd: '/repo',
+      home: '/home/u',
+      agents: ['astudio'],
+      scope: 'project',
+      json: false,
+      interactive: false
+    })).rejects.toThrow('agent astudio does not support project scope')
+  })
+
   test('scope=user + agent codex returns user root with user scope', async () => {
     const targets = await resolveInstallTargets({
       cwd: '/repo',
diff --git a/docs/skillhub/en/guide/cli.md b/docs/skillhub/en/guide/cli.md
index fe0a5bbc..84a211dd 100644
--- a/docs/skillhub/en/guide/cli.md
+++ b/docs/skillhub/en/guide/cli.md
@@ -154,6 +154,9 @@ skillhub install pdf-parser --version 1.2.0
 # Install to specific Agent
 skillhub install pdf-parser --agent codex
 
+# Install to AStudio's fixed user-level directory
+skillhub install pdf-parser --agent astudio
+
 # Install to multiple Agents
 skillhub install pdf-parser --agent codex --agent claude-code
 
@@ -182,10 +185,11 @@ The CLI determines the installation location using the following logic:
 
 ### Install Paths
 
-Each Agent has both project-level and user-level skills directories. Use `--scope user|project` to control which one is used.
+Most Agents have both project-level and user-level skills directories. Use `--scope user|project` to control which one is used. AStudio uses its fixed user-level directory only.
 
 | Agent | Project-level Path | User-level Path |
 |-------|-------------------|-----------------|
+| `astudio` (AStudio) | Not supported | `~/.acode/skills/` |
 | `claude-code` | `<project>/.claude/skills/` | `~/.claude/skills/` |
 | `codex` | `<project>/.codex/skills/` | `~/.codex/skills/` |
 | `cursor` | `<project>/.cursor/skills/` | `~/.cursor/skills/` |
@@ -202,7 +206,7 @@ Each Agent has both project-level and user-level skills directories. Use `--scop
 | `kilo` | `<project>/.kilo/skills/` | `~/.kilo/skills/` |
 | _fallback_ | `<project>/.agents/skills/` | `~/.agents/skills/` |
 
-For a custom path or an unsupported Agent directory, use `--dir` to specify the installation path. In interactive user scope, the `generic` target is offered alongside detected Agent targets. When `--scope user|project` finds no matching agent directory, the CLI falls back to the `_fallback_` row above.
+For a custom path or an unsupported Agent directory, use `--dir` to specify the installation path. In interactive user scope, the `generic` target is offered alongside detected Agent targets. AStudio appears in that selector when `~/.acode/skills/` exists. When `--scope user|project` finds no matching agent directory, the CLI falls back to the `_fallback_` row above.
 
 ### File Structure After Installation
 
diff --git a/docs/skillhub/guide/cli.md b/docs/skillhub/guide/cli.md
index d15d706b..9c7bf3e9 100644
--- a/docs/skillhub/guide/cli.md
+++ b/docs/skillhub/guide/cli.md
@@ -150,6 +150,9 @@ skillhub install pdf-parser --version 1.2.0
 # 安装到指定 Agent
 skillhub install pdf-parser --agent codex
 
+# 安装到 AStudio 的固定用户级目录
+skillhub install pdf-parser --agent astudio
+
 # 安装到多个 Agent
 skillhub install pdf-parser --agent codex --agent claude-code
 
@@ -178,10 +181,11 @@ CLI 按以下逻辑确定安装位置：
 
 ### 安装路径
 
-每个 Agent 有项目级和用户级两个 skills 目录。`--scope user|project` 决定使用哪一个。
+大多数 Agent 都有项目级和用户级两个 skills 目录。`--scope user|project` 决定使用哪一个。AStudio 仅使用固定的用户级目录。
 
 | Agent | 项目级路径 | 用户级路径 |
 |-------|-----------|-----------|
+| `astudio`（AStudio） | 不支持 | `~/.acode/skills/` |
 | `claude-code` | `<project>/.claude/skills/` | `~/.claude/skills/` |
 | `codex` | `<project>/.codex/skills/` | `~/.codex/skills/` |
 | `cursor` | `<project>/.cursor/skills/` | `~/.cursor/skills/` |
@@ -198,7 +202,7 @@ CLI 按以下逻辑确定安装位置：
 | `kilo` | `<project>/.kilo/skills/` | `~/.kilo/skills/` |
 | _fallback_ | `<project>/.agents/skills/` | `~/.agents/skills/` |
 
-对于自定义路径或不在列表中的 Agent 目录，使用 `--dir` 显式指定安装路径。交互式 user scope 下会与已探测 Agent 目标一同提供 `generic` 目标；当 `--scope user|project` 找不到匹配的 agent 目录时，CLI 会回退到上表的 `_fallback_` 行。
+对于自定义路径或不在列表中的 Agent 目录，使用 `--dir` 显式指定安装路径。交互式 user scope 下会与已探测 Agent 目标一同提供 `generic` 目标；当 `~/.acode/skills/` 存在时，选择器会显示 AStudio。当 `--scope user|project` 找不到匹配的 agent 目录时，CLI 会回退到上表的 `_fallback_` 行。
 
 ### 安装后的文件结构