diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 024a27c6..a871fa6e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -41,6 +41,7 @@ jobs:
           npm --version
           python --version
           npm ci
+          npm exec --no -- opencode --version
           python -m pip install -r requirements.txt
           python -m pip check
       - name: Frontend tests
diff --git a/apps/api/src/opendirector_api/agent.py b/apps/api/src/opendirector_api/agent.py
index 5e2e3e98..5e0198c8 100644
--- a/apps/api/src/opendirector_api/agent.py
+++ b/apps/api/src/opendirector_api/agent.py
@@ -187,7 +187,7 @@ async def available_runtimes(project_id: UUID, probe: bool = True):
         if probe:
             return await configured_runtimes()
         return [{**item, 'status': 'not_installed' if not item['available'] else
-                 'ready' if item['id'] in {'default', 'opencode'} else 'checking'}
+                 'ready' if item['id'] == 'opencode' else 'checking'}
                 for item in runtime_catalog()]
 
     @router.get('/runtimes/{runtime}/status')
diff --git a/docs/development/validation.md b/docs/development/validation.md
index afe225e3..11167401 100644
--- a/docs/development/validation.md
+++ b/docs/development/validation.md
@@ -8,6 +8,7 @@
 
 ```sh
 npm ci
+npm exec --no -- opencode --version
 python3 -m venv .venv
 .venv/bin/python -m pip install -r requirements.txt
 
@@ -17,6 +18,8 @@ npm run build
 .venv/bin/python scripts/generate_contracts.py --check
 ```
 
+内置 Agent 安装验证必须实际执行上述 OpenCode 版本命令，不能只检查文件存在。不要跳过 `opencode-ai` 的安装脚本；若依赖安装不完整，在仓库根目录重新执行 `npm ci` 并允许安装脚本运行。
+
 Windows 使用对应虚拟环境的 Python 路径。涉及真实媒体探测、工具处理或对应测试时，需要 PATH 中的 `ffmpeg` 和 `ffprobe`；视频处理使用 `libx264` 编码器，可通过 `ffmpeg -encoders` 检查是否包含它。不因纯文档修改而运行全部生成或媒体测试。
 
 macOS 使用 README 中的 `python3.12` 环境准备命令，避免误用系统旧版 `python3`。安装验证需使用全新源码目录、新建 `.venv` 和 `npm ci`，然后构建并通过正式 `serve` 入口检查页面、上传、刷新与服务重启恢复。实测边界见 [macOS 安装验证记录](macos-install-validation.md)。
diff --git a/packages/core/src/opendirector/agent/native.py b/packages/core/src/opendirector/agent/native.py
index 9c9d0fd9..e28ea138 100644
--- a/packages/core/src/opendirector/agent/native.py
+++ b/packages/core/src/opendirector/agent/native.py
@@ -20,6 +20,9 @@
 from opendirector.integrations.chat_completions import ChatCompletions
 
 
+BUNDLED_INSTALL_ERROR = ('内置 Agent 依赖安装不完整或无法运行，请在仓库根目录执行 npm ci，并确保允许 opencode-ai 的安装脚本运行。')
+
+
 def executable(runtime: str) -> str | None:
     if runtime == 'default':
         for name in ('opencode.exe', 'opencode'):
@@ -35,7 +38,7 @@ def command(runtime: str, work: Path, socket: str, token: str, model: str | None
             bridge_env: dict[str, str] | None = None) -> tuple[list[str], dict[str, str]]:
     binary = executable(runtime)
     if binary is None:
-        raise ProjectError('内置 OpenCode 未安装，请执行 npm ci。' if runtime == 'default' else f'{runtime} CLI 未安装，请先安装。', 503)
+        raise ProjectError(BUNDLED_INSTALL_ERROR if runtime == 'default' else f'{runtime} CLI 未安装，请先安装。', 503)
     bundled = runtime == 'default'
     if bundled:
         runtime = 'opencode'
@@ -209,9 +212,14 @@ async def connection(reader, writer):
                         prompt = f'Use the native skill tool to load {name} from {work / ".agents/skills"} before proceeding.\n' + prompt
                     else:
                         prompt = f'Use the native skill tool to load {name} before proceeding.\n' + prompt
-                process = await asyncio.create_subprocess_exec(*args, cwd=work, env=env,
-                    stdin=asyncio.subprocess.PIPE, stdout=asyncio.subprocess.PIPE,
-                    stderr=asyncio.subprocess.PIPE, start_new_session=True, limit=64 * 1024 * 1024)
+                try:
+                    process = await asyncio.create_subprocess_exec(*args, cwd=work, env=env,
+                        stdin=asyncio.subprocess.PIPE, stdout=asyncio.subprocess.PIPE,
+                        stderr=asyncio.subprocess.PIPE, start_new_session=True, limit=64 * 1024 * 1024)
+                except OSError as error:
+                    if run.runtime == 'default':
+                        raise ProjectError(BUNDLED_INSTALL_ERROR, 503, code='agent_dependency_unavailable') from error
+                    raise
                 stderr_tail = bytearray()
                 async def drain_stderr():
                     while chunk := await process.stderr.read(4096):
diff --git a/packages/core/src/opendirector/agent/runtime.py b/packages/core/src/opendirector/agent/runtime.py
index 18d2541a..cf3c46b5 100644
--- a/packages/core/src/opendirector/agent/runtime.py
+++ b/packages/core/src/opendirector/agent/runtime.py
@@ -69,9 +69,9 @@ async def runtime_readiness(engine: str) -> str:
     executable = native.executable(engine)
     if executable is None:
         return 'not_installed'
-    if engine in {'default', 'opencode'}:
+    if engine == 'opencode':
         return 'ready'
-    args = ['login', 'status'] if engine == 'codex' else ['auth', 'status', '--json']
+    args = ['--version'] if engine == 'default' else ['login', 'status'] if engine == 'codex' else ['auth', 'status', '--json']
     try:
         process = await asyncio.create_subprocess_exec(
             str(executable), *args, stdout=asyncio.subprocess.PIPE,
@@ -80,6 +80,8 @@ async def runtime_readiness(engine: str) -> str:
         return 'unknown'
     try:
         output, _ = await asyncio.wait_for(process.communicate(), 5)
+        if engine == 'default':
+            return 'ready' if process.returncode == 0 and output.strip() else 'unknown'
         if engine == 'claude':
             try:
                 logged_in = json.loads(output)['loggedIn']
diff --git a/packages/core/src/opendirector/agent/skills.py b/packages/core/src/opendirector/agent/skills.py
index 679af666..988d25e7 100644
--- a/packages/core/src/opendirector/agent/skills.py
+++ b/packages/core/src/opendirector/agent/skills.py
@@ -5,7 +5,7 @@
 from pathlib import Path
 from tempfile import TemporaryDirectory
 
-from opendirector.agent.native import executable
+from opendirector.agent.native import BUNDLED_INSTALL_ERROR, executable
 from opendirector.agent.process import terminate
 from opendirector.agent.tools import ROOT
 from opendirector.domain.projects import ProjectError
@@ -14,20 +14,23 @@
 async def skills(repository: Path, directory: Path) -> list[dict[str, str]]:
     binary = executable('default')
     if binary is None:
-        raise ProjectError('技能发现需要内置 OpenCode，请执行 npm ci。', 503)
+        raise ProjectError(BUNDLED_INSTALL_ERROR, 503, code='agent_dependency_unavailable')
     roots = [path.resolve() for path in [directory / '.opendirector/skills',
         repository / '.opendirector/skills', ROOT / 'packages/agent/skills'] if path.is_dir()]
     with TemporaryDirectory(prefix='od-skills-') as temporary:
         env = {**os.environ, 'XDG_CONFIG_HOME': temporary,
                'OPENCODE_DISABLE_EXTERNAL_SKILLS': '1', 'OPENCODE_DISABLE_CLAUDE_CODE_SKILLS': '1',
                'OPENCODE_CONFIG_CONTENT': json.dumps({'skills': {'paths': list(map(str, roots))}})}
-        process = await asyncio.create_subprocess_exec(binary, 'debug', 'skill', '--pure',
-            cwd=temporary, env=env, stdin=asyncio.subprocess.DEVNULL,
-            stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE)
+        try:
+            process = await asyncio.create_subprocess_exec(binary, 'debug', 'skill', '--pure',
+                cwd=temporary, env=env, stdin=asyncio.subprocess.DEVNULL,
+                stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE)
+        except OSError as error:
+            raise ProjectError(BUNDLED_INSTALL_ERROR, 503, code='agent_dependency_unavailable') from error
         try:
             data, _ = await asyncio.wait_for(process.communicate(), 20)
             if process.returncode:
-                raise ProjectError('OpenCode 技能发现失败，请检查 npm 依赖。', 503)
+                raise ProjectError(BUNDLED_INSTALL_ERROR, 503, code='agent_dependency_unavailable')
             try:
                 catalog = json.loads(data)
             except json.JSONDecodeError:
diff --git a/tests/test_native_runtime.py b/tests/test_native_runtime.py
index e4348fc8..e9ea6c1f 100644
--- a/tests/test_native_runtime.py
+++ b/tests/test_native_runtime.py
@@ -245,3 +245,24 @@ def test_bundled_model_declares_configured_inputs_without_changing_cli_provider(
     config = json.loads(env['OPENCODE_CONFIG_CONTENT'])
     assert config['provider']['opendirector']['models']['vision-agent']['modalities'] == {
         'input': ['text', 'image'], 'output': ['text']}
+
+
+def test_bundled_launch_reports_incomplete_install(tmp_path, monkeypatch):
+    from opendirector.domain.projects import ProjectError
+    from opendirector.infrastructure.creation_projects import CreationProjects
+
+    binary = tmp_path / 'opencode.exe'
+    binary.write_text('echo "postinstall was not run"\nexit 1\n')
+    binary.chmod(0o755)
+    monkeypatch.setattr(native, 'executable', lambda _: str(binary))
+    instance = AgentRuntimes(CreationProjects(LocalProjects(tmp_path)), None, ModelConfigs(tmp_path))
+    async def check():
+        with pytest.raises(ProjectError, match='内置 Agent 依赖安装不完整') as caught:
+            async for _ in instance.stream(RunContext(runtime='default', project_id=uuid4(),
+                    turn_id=uuid4(), session=str(uuid4()), directory=tmp_path,
+                    config={'modelId': 'test', 'apiKey': '', 'url': 'http://localhost/v1', 'protocol': 'openai'},
+                    messages=[{'role': 'user', 'content': 'hello'}], selected_skills=[])):
+                pass
+        assert caught.value.code == 'agent_dependency_unavailable'
+        assert caught.value.status == 503
+    asyncio.run(check())
diff --git a/tests/test_runtime_readiness.py b/tests/test_runtime_readiness.py
index 2fb244d6..46a43b5c 100644
--- a/tests/test_runtime_readiness.py
+++ b/tests/test_runtime_readiness.py
@@ -97,3 +97,39 @@ async def probe(engine):
         assert response.status_code == 200
         assert response.json()['status']=='ready'
         assert calls == ['codex']
+
+
+@pytest.mark.parametrize('content, expected', [
+    ('echo "postinstall was not run"\nexit 1\n', 'unknown'),
+    (f'#!{sys.executable}\nraise SystemExit(1)\n', 'unknown'),
+    (f'#!{sys.executable}\nimport sys\nassert sys.argv[1:] == ["--version"]\nprint("1.19.5")\n', 'ready'),
+])
+def test_bundled_readiness_runs_binary(tmp_path, monkeypatch, content, expected):
+    binary = tmp_path / 'opencode.exe'
+    binary.write_text(content)
+    binary.chmod(0o755)
+    monkeypatch.setattr(runtime.native, 'executable', lambda _: str(binary))
+    assert asyncio.run(runtime.runtime_readiness('default')) == expected
+
+
+def test_skill_endpoint_reports_incomplete_bundled_install(tmp_path, monkeypatch):
+    from uuid import uuid4
+    from fastapi.testclient import TestClient
+    from opendirector_api.main import create_app
+    from opendirector.infrastructure.local_projects import LocalProjects
+
+    binary = tmp_path / 'opencode.exe'
+    binary.write_text('echo "postinstall was not run"\nexit 1\n')
+    binary.chmod(0o755)
+    monkeypatch.setattr('opendirector.agent.skills.executable', lambda _: str(binary))
+    pid = str(uuid4())
+    path = f'/api/creation/projects/{pid}'
+    with TestClient(create_app(LocalProjects(tmp_path)), headers={
+        'X-OpenDirector-Request': '1', 'X-OpenDirector-Session': str(uuid4())}) as client:
+        assert client.post(path + '/commands', json={'type': 'project.create', 'projectId': pid,
+            'commandId': str(uuid4()), 'payload': {'name': 'Incomplete install'}}).status_code == 200
+        response = client.get(path + '/assistant/skills')
+        assert response.status_code == 503
+        assert response.json()['code'] == 'agent_dependency_unavailable'
+        assert 'npm ci' in response.json()['detail']
+        assert '磁盘空间' not in response.json()['detail']