```

feat(engine): 优化智能体循环中的助手消息处理逻辑

- 在没有工具调用时才添加助手消息到上下文
- 确保工具调用响应正确添加到消息上下文中
- 修复了消息构建的条件逻辑

fix(cron): 改进定时任务调度的时间解析功能

- 添加正则表达式导入用于时间显示解析
- 实现从显示文本中提取毫秒间隔的功能
- 增强整数转换的安全性，避免类型错误
- 优化定时任务配置的解析逻辑

feat(outlook): 增强Outlook集成的功能和稳定性

- 将默认超时时间从10秒增加到180秒
- 为状态检查函数添加可选的验证参数
- 串行执行邮件概览获取操作而非并行
- 改进连接状态验证逻辑

feat(channel): 添加设备名称作为会话标识的选项

- 为终端WebSocket适配器添加新的配置选项
- 实现基于设备名称生成会话对等ID的功能
- 记录原始对等ID和设备名称的元数据
- 支持从设备名称创建会话对等ID

feat(skills): 完善技能学习评估系统和进度跟踪

- 在应用启动时自动调度待评估的技能草稿
- 为技能评估工作创建独立的循环工厂
- 实现异步技能评估任务的取消和清理机制
- 添加技能评估进度报告和状态跟踪功能
- 扩展会话列表API以包含更多详细信息
- 防止对不存在的会话进行操作
- 优化技能草稿提交和评估的业务逻辑

perf(skills): 提升技能评估的并发性能

- 实现并行技能案例评估以提高效率
- 添加最大并行案例数的环境变量控制
- 实现实时评估进度更新和回调机制
- 优化评估过程中的资源管理和同步

refactor(services): 创建隔离的智能体循环实例

- 添加创建独立智能体循环的工厂方法
- 确保新循环继承运行时服务配置
- 支持技能评估等需要隔离环境的场景
```

app-instance/backend/tests/unit/test_web_tools.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import asyncio
+import json
 
 from beaver.tools.builtins import web
 
@@ -8,8 +9,16 @@ from beaver.tools.builtins import web
 class _FakeResponse:
     headers = {"content-type": "text/html"}
     status_code = 200
-    text = '<a class="result__a" href="https://example.com">Example</a>'
-    url = "https://example.com"
+
+    def __init__(self, url: str = "https://example.com") -> None:
+        self.url = url
+        if "duckduckgo.com" in url:
+            self.text = '<a class="result__a" href="https://duck.example.com">Duck Example</a>'
+        else:
+            self.text = (
+                '<li class="b_algo"><h2><a href="https://example.com">Example</a></h2>'
+                "<p>Example result</p></li>"
+            )
 
     def raise_for_status(self) -> None:
         return None
@@ -17,6 +26,8 @@ class _FakeResponse:
 
 class _FakeAsyncClient:
     calls: list[dict[str, object]] = []
+    urls: list[str] = []
+    fail_bing = False
 
     def __init__(self, **kwargs: object) -> None:
         self.calls.append(kwargs)
@@ -28,7 +39,11 @@ class _FakeAsyncClient:
         return None
 
     async def get(self, *args: object, **kwargs: object) -> _FakeResponse:
-        return _FakeResponse()
+        url = str(args[0])
+        self.urls.append(url)
+        if self.fail_bing and "bing.com" in url:
+            raise web.httpx.ConnectTimeout("bing unavailable")
+        return _FakeResponse(url)
 
 
 def test_web_tools_use_environment_proxy_settings(monkeypatch) -> None:
@@ -42,3 +57,56 @@ def test_web_tools_use_environment_proxy_settings(monkeypatch) -> None:
     asyncio.run(_run())
 
     assert [call.get("trust_env") for call in _FakeAsyncClient.calls] == [True, True]
+
+
+def test_web_fetch_uses_short_connect_timeout(monkeypatch) -> None:
+    _FakeAsyncClient.calls = []
+    _FakeAsyncClient.urls = []
+    _FakeAsyncClient.fail_bing = False
+    monkeypatch.setattr(web.httpx, "AsyncClient", _FakeAsyncClient)
+
+    asyncio.run(web.WebFetchTool().execute(url="https://example.com"))
+
+    timeout = _FakeAsyncClient.calls[0]["timeout"]
+    assert isinstance(timeout, web.httpx.Timeout)
+    assert timeout.connect == 5
+    assert timeout.read == 12
+
+
+def test_web_search_uses_reachable_bing_endpoint_first(monkeypatch) -> None:
+    _FakeAsyncClient.calls = []
+    _FakeAsyncClient.urls = []
+    _FakeAsyncClient.fail_bing = False
+    monkeypatch.setattr(web.httpx, "AsyncClient", _FakeAsyncClient)
+
+    raw = asyncio.run(web.WebSearchTool().execute(query="weather beijing"))
+
+    payload = json.loads(raw)
+    assert payload["success"] is True
+    assert payload["engine"] in {"bing", "duckduckgo"}
+    assert set(_FakeAsyncClient.urls) == {
+        "https://www.bing.com/search?q=weather+beijing",
+        "https://duckduckgo.com/html/?q=weather+beijing",
+    }
+
+    timeout = _FakeAsyncClient.calls[0]["timeout"]
+    assert isinstance(timeout, web.httpx.Timeout)
+    assert timeout.connect == 5
+    assert timeout.read == 8
+
+
+def test_web_search_falls_back_when_bing_is_unavailable(monkeypatch) -> None:
+    _FakeAsyncClient.calls = []
+    _FakeAsyncClient.urls = []
+    _FakeAsyncClient.fail_bing = True
+    monkeypatch.setattr(web.httpx, "AsyncClient", _FakeAsyncClient)
+
+    raw = asyncio.run(web.WebSearchTool().execute(query="weather beijing"))
+
+    payload = json.loads(raw)
+    assert payload["success"] is True
+    assert payload["engine"] == "duckduckgo"
+    assert set(_FakeAsyncClient.urls) == {
+        "https://www.bing.com/search?q=weather+beijing",
+        "https://duckduckgo.com/html/?q=weather+beijing",
+    }