fix(box): tighten sandbox exposure and restore box integration coverage

src/langbot/pkg/box/service.py

@@ -279,11 +279,6 @@ class BoxService:
             default_host_workspace = os.path.join(self.shared_host_root, 'default')
         return os.path.realpath(os.path.abspath(default_host_workspace))
 
-    def get_managed_skills_root(self) -> str | None:
-        if self.shared_host_root is None:
-            return None
-        return os.path.join(self.shared_host_root, 'skills')
-
     def _ensure_default_host_workspace(self):
         if self.default_host_workspace is None:
             return

src/langbot/pkg/provider/runner.py

@@ -2,8 +2,12 @@ from __future__ import annotations
 
 import abc
 import typing
+from typing import TYPE_CHECKING
 
-from ..core import app
+if TYPE_CHECKING:
+    from ..core import app
+    import langbot_plugin.api.entities.builtin.pipeline.query as pipeline_query
+    import langbot_plugin.api.entities.builtin.provider.message as provider_message
 
 
 preregistered_runners: list[typing.Type[RequestRunner]] = []
@@ -25,17 +29,17 @@ class RequestRunner(abc.ABC):
 
     name: str = None
 
-    ap: app.Application
+    ap: 'app.Application'
 
     pipeline_config: dict
 
-    def __init__(self, ap: app.Application, pipeline_config: dict):
+    def __init__(self, ap: 'app.Application', pipeline_config: dict):
         self.ap = ap
         self.pipeline_config = pipeline_config
 
     @abc.abstractmethod
     async def run(
-        self, query: core_entities.Query
-    ) -> typing.AsyncGenerator[llm_entities.Message | llm_entities.MessageChunk, None]:
+        self, query: 'pipeline_query.Query'
+    ) -> typing.AsyncGenerator['provider_message.Message | provider_message.MessageChunk', None]:
         """运行请求"""
         pass

src/langbot/pkg/provider/tools/loader.py

@@ -2,12 +2,14 @@ from __future__ import annotations
 
 import abc
 import typing
+from typing import TYPE_CHECKING
 
 from langbot_plugin.api.entities.events import pipeline_query
-
-from ...core import app
 import langbot_plugin.api.entities.builtin.resource.tool as resource_tool
 
+if TYPE_CHECKING:
+    from ...core import app
+
 
 preregistered_loaders: list[typing.Type[ToolLoader]] = []
 
@@ -28,9 +30,9 @@ class ToolLoader(abc.ABC):
 
     name: str = None
 
-    ap: app.Application
+    ap: 'app.Application'
 
-    def __init__(self, ap: app.Application):
+    def __init__(self, ap: 'app.Application'):
         self.ap = ap
 
     async def initialize(self):

src/langbot/pkg/provider/tools/loaders/mcp.py

@@ -147,7 +147,6 @@ class RuntimeMCPSession:
         try:
             await box_service.create_session(
                 session_payload,
-                skip_host_mount_validation=True,
             )
         except Exception:
             self.error_phase = MCPSessionErrorPhase.SESSION_CREATE
@@ -164,9 +163,7 @@ class RuntimeMCPSession:
                 exec_payload['cmd'] = install_cmd
                 exec_payload['timeout_sec'] = self.box_config.startup_timeout_sec or 120
                 try:
-                    result = await box_service.client.execute(
-                        box_service.build_spec(exec_payload, skip_host_mount_validation=True)
-                    )
+                    result = await box_service.client.execute(box_service.build_spec(exec_payload))
                 except Exception:
                     self.error_phase = MCPSessionErrorPhase.DEP_INSTALL
                     raise

src/langbot/pkg/provider/tools/loaders/native.py

@@ -17,12 +17,14 @@ class NativeToolLoader(loader.ToolLoader):
         self._sandbox_exec_tool: resource_tool.LLMTool | None = None
 
     async def get_tools(self, bound_plugins: list[str] | None = None) -> list[resource_tool.LLMTool]:
+        if not self._is_sandbox_available():
+            return []
         if self._sandbox_exec_tool is None:
             self._sandbox_exec_tool = self._build_sandbox_exec_tool()
         return [self._sandbox_exec_tool]
 
     async def has_tool(self, name: str) -> bool:
-        return name == SANDBOX_EXEC_TOOL_NAME
+        return name == SANDBOX_EXEC_TOOL_NAME and self._is_sandbox_available()
 
     async def invoke_tool(self, name: str, parameters: dict, query: pipeline_query.Query):
         if name != SANDBOX_EXEC_TOOL_NAME:
@@ -37,6 +39,10 @@ class NativeToolLoader(loader.ToolLoader):
     async def shutdown(self):
         pass
 
+    def _is_sandbox_available(self) -> bool:
+        box_service = getattr(self.ap, 'box_service', None)
+        return bool(getattr(box_service, 'available', False))
+
     def _build_sandbox_exec_tool(self) -> resource_tool.LLMTool:
         return resource_tool.LLMTool(
             name=SANDBOX_EXEC_TOOL_NAME,

src/langbot/pkg/provider/tools/toolmgr.py

@@ -1,27 +1,30 @@
 from __future__ import annotations
 
 import typing
+from typing import TYPE_CHECKING
 
-from ...core import app
 from langbot.pkg.utils import importutil
 from langbot.pkg.provider.tools import loaders
 from langbot.pkg.provider.tools.loaders import mcp as mcp_loader, native as native_loader, plugin as plugin_loader
 import langbot_plugin.api.entities.builtin.resource.tool as resource_tool
 from langbot_plugin.api.entities.events import pipeline_query
 
+if TYPE_CHECKING:
+    from ...core import app
+
 importutil.import_modules_in_pkg(loaders)
 
 
 class ToolManager:
     """LLM工具管理器"""
 
-    ap: app.Application
+    ap: 'app.Application'
 
     native_tool_loader: native_loader.NativeToolLoader
     plugin_tool_loader: plugin_loader.PluginToolLoader
     mcp_tool_loader: mcp_loader.MCPLoader
 
-    def __init__(self, ap: app.Application):
+    def __init__(self, ap: 'app.Application'):
         self.ap = ap
 
     async def initialize(self):

tests/integration_tests/box/test_box_integration.py

@@ -21,13 +21,13 @@ from types import SimpleNamespace
 
 import pytest
 
-from langbot.pkg.box.backend import BaseSandboxBackend
-from langbot.pkg.box.client import ActionRPCBoxClient
-from langbot.pkg.box.errors import BoxBackendUnavailableError
-from langbot.pkg.box.models import BoxExecutionStatus, BoxNetworkMode, BoxSpec
-from langbot.pkg.box.runtime import BoxRuntime
-from langbot.pkg.box.server import BoxServerHandler
 from langbot.pkg.box.service import BoxService
+from langbot_plugin.box.backend import BaseSandboxBackend
+from langbot_plugin.box.client import ActionRPCBoxClient
+from langbot_plugin.box.errors import BoxBackendUnavailableError
+from langbot_plugin.box.models import BoxExecutionStatus, BoxNetworkMode, BoxSpec
+from langbot_plugin.box.runtime import BoxRuntime
+from langbot_plugin.box.server import BoxServerHandler
 
 import langbot_plugin.api.entities.builtin.pipeline.query as pipeline_query
 

tests/integration_tests/box/test_box_mcp_integration.py

@@ -22,11 +22,11 @@ import aiohttp
 import pytest
 from aiohttp.test_utils import TestServer
 
-from langbot.pkg.box.client import ActionRPCBoxClient
-from langbot.pkg.box.errors import BoxSessionNotFoundError
-from langbot.pkg.box.models import BoxManagedProcessSpec, BoxManagedProcessStatus, BoxSpec
-from langbot.pkg.box.runtime import BoxRuntime
-from langbot.pkg.box.server import BoxServerHandler, create_ws_relay_app
+from langbot_plugin.box.client import ActionRPCBoxClient
+from langbot_plugin.box.errors import BoxSessionNotFoundError
+from langbot_plugin.box.models import BoxManagedProcessSpec, BoxManagedProcessStatus, BoxSpec
+from langbot_plugin.box.runtime import BoxRuntime
+from langbot_plugin.box.server import BoxServerHandler, create_ws_relay_app
 
 _logger = logging.getLogger('test.box.mcp_integration')
 

tests/unit_tests/provider/test_localagent_sandbox_exec.py

@@ -1,22 +1,16 @@
 from __future__ import annotations
 
+import json
+from types import SimpleNamespace
+from unittest.mock import AsyncMock, Mock
+
 import pytest
 
-# TODO: unskip once runner.py adopts TYPE_CHECKING guard to break the circular import
-pytest.skip(
-    'circular import between runner ↔ app; will be unblocked once resolved',
-    allow_module_level=True,
-)
+import langbot_plugin.api.entities.builtin.pipeline.query as pipeline_query
+import langbot_plugin.api.entities.builtin.provider.message as provider_message
+import langbot_plugin.api.entities.builtin.provider.session as provider_session
 
-import json  # noqa: E402
-from types import SimpleNamespace  # noqa: E402
-from unittest.mock import AsyncMock, Mock  # noqa: E402
-
-import langbot_plugin.api.entities.builtin.pipeline.query as pipeline_query  # noqa: E402
-import langbot_plugin.api.entities.builtin.provider.message as provider_message  # noqa: E402
-import langbot_plugin.api.entities.builtin.provider.session as provider_session  # noqa: E402
-
-from langbot.pkg.provider.runners.localagent import LocalAgentRunner  # noqa: E402
+from langbot.pkg.provider.runners.localagent import LocalAgentRunner
 
 
 class RecordingProvider:
@@ -168,6 +162,8 @@ async def test_localagent_uses_sandbox_exec_for_exact_calculation():
                 return_value=(
                     'When sandbox_exec is available, use it for exact calculations, statistics, '
                     'structured data parsing, and code execution instead of estimating mentally. '
+                    'Unless the user explicitly asks for the script, code, or implementation details, '
+                    'do not include the generated script in the final answer. '
                     'A default host workspace is mounted at /workspace for file tasks.'
                 )
             ),

tests/unit_tests/provider/test_mcp_box_integration.py

@@ -12,7 +12,9 @@ import os
 import sys
 import tempfile
 import types
-from unittest.mock import Mock
+from contextlib import asynccontextmanager
+from types import SimpleNamespace
+from unittest.mock import AsyncMock, Mock
 
 import pytest
 
@@ -576,3 +578,58 @@ class TestBoxConfigParsing:
         assert isinstance(s.box_config, mcp_module.MCPServerBoxConfig)
         assert s.box_config.image is None
         assert s.box_config.host_path_mode == 'ro'
+
+
+@pytest.mark.asyncio
+async def test_init_box_stdio_server_keeps_host_mount_validation_enabled(mcp_module):
+    class FakeClientSession:
+        def __init__(self, *_args):
+            pass
+
+        async def __aenter__(self):
+            return self
+
+        async def __aexit__(self, exc_type, exc, tb):
+            return False
+
+        async def initialize(self):
+            return None
+
+    @asynccontextmanager
+    async def fake_websocket_client(_url: str):
+        yield ('read-stream', 'write-stream')
+
+    mcp_module.ClientSession = FakeClientSession
+    mcp_module.websocket_client = fake_websocket_client
+
+    ap = _make_ap()
+    ap.box_service.available = True
+    ap.box_service.create_session = AsyncMock(return_value={})
+    ap.box_service.build_spec = Mock(return_value='validated-spec')
+    ap.box_service.client = SimpleNamespace(
+        execute=AsyncMock(return_value=SimpleNamespace(ok=True, stderr='', exit_code=0))
+    )
+    ap.box_service.start_managed_process = AsyncMock(return_value={})
+    ap.box_service.get_managed_process_websocket_url = Mock(return_value='ws://box.example/process')
+
+    session = _make_session(
+        mcp_module,
+        {
+            'name': 'test',
+            'uuid': 'u1',
+            'mode': 'stdio',
+            'command': '/home/user/mcp/.venv/bin/python',
+            'args': ['/home/user/mcp/server.py'],
+            'box': {'host_path': '/home/user/mcp'},
+        },
+        ap=ap,
+    )
+    session._detect_install_command = Mock(return_value='pip install --no-cache-dir -r /workspace/requirements.txt')
+
+    await session._init_box_stdio_server()
+    await session.exit_stack.aclose()
+
+    assert ap.box_service.create_session.await_count == 1
+    assert ap.box_service.create_session.await_args.kwargs.get('skip_host_mount_validation', False) is False
+    assert ap.box_service.build_spec.call_count == 1
+    assert ap.box_service.build_spec.call_args.kwargs.get('skip_host_mount_validation', False) is False

tests/unit_tests/provider/test_tool_manager_native.py

@@ -7,6 +7,7 @@ import pytest
 
 import langbot_plugin.api.entities.builtin.resource.tool as resource_tool
 
+from langbot.pkg.provider.tools.loaders.native import NativeToolLoader
 from langbot.pkg.provider.tools.toolmgr import ToolManager
 
 
@@ -61,3 +62,21 @@ async def test_tool_manager_routes_native_tool_calls():
     result = await manager.execute_func_call('sandbox_exec', {'cmd': 'pwd'}, query=Mock())
 
     assert result == {'backend': 'fake'}
+
+
+@pytest.mark.asyncio
+async def test_native_tool_loader_hides_sandbox_exec_when_box_unavailable():
+    loader = NativeToolLoader(SimpleNamespace(box_service=SimpleNamespace(available=False)))
+
+    assert await loader.get_tools() == []
+    assert await loader.has_tool('sandbox_exec') is False
+
+
+@pytest.mark.asyncio
+async def test_native_tool_loader_exposes_sandbox_exec_when_box_available():
+    loader = NativeToolLoader(SimpleNamespace(box_service=SimpleNamespace(available=True)))
+
+    tools = await loader.get_tools()
+
+    assert [tool.name for tool in tools] == ['sandbox_exec']
+    assert await loader.has_tool('sandbox_exec') is True