feat: 修正 web search 工具

DEV-LOG.md

@@ -1,5 +1,39 @@
 # DEV-LOG
 
+## WebSearch Bing 适配器补全 (2026-04-03)
+
+原始 `WebSearchTool` 仅支持 Anthropic API 服务端搜索（`web_search_20250305` server tool），在非官方 API 端点（第三方代理）下搜索功能不可用。本次改动引入适配器架构，新增 Bing 搜索页面解析作为 fallback。
+
+**新增文件：**
+
+| 文件 | 说明 |
+|------|------|
+| `src/tools/WebSearchTool/adapters/types.ts` | 适配器接口定义：`WebSearchAdapter`、`SearchResult`、`SearchOptions`、`SearchProgress` |
+| `src/tools/WebSearchTool/adapters/apiAdapter.ts` | API 适配器 — 将原有 `queryModelWithStreaming` 逻辑封装为 `ApiSearchAdapter` |
+| `src/tools/WebSearchTool/adapters/bingAdapter.ts` | Bing 适配器 — 直接抓取 Bing HTML，正则提取搜索结果 |
+| `src/tools/WebSearchTool/adapters/index.ts` | 适配器工厂 — 根据环境变量 / API Base URL 选择后端 |
+| `src/tools/WebSearchTool/__tests__/bingAdapter.test.ts` | Bing 适配器单元测试（32 cases：decodeHtmlEntities、extractBingResults、search mock） |
+| `src/tools/WebSearchTool/__tests__/bingAdapter.integration.ts` | Bing 适配器集成测试 — 真实网络请求验证 |
+
+**重构文件：**
+
+| 文件 | 变更 |
+|------|------|
+| `src/tools/WebSearchTool/WebSearchTool.ts` | 从直接调用 API 改为 `createAdapter()` 工厂模式；`isEnabled()` 始终返回 true；删除 ~200 行内联 API 调用逻辑 |
+| `src/tools/WebFetchTool/utils.ts` | `skipWebFetchPreflight` 默认值从 `!undefined`（即 true）改为显式 `=== false`，使域名预检默认启用 |
+
+**Bing 适配器关键技术细节：**
+
+1. **反爬绕过**：使用完整 Edge 浏览器请求头（含 `Sec-Ch-Ua`、`Sec-Fetch-*` 等 13 个标头），避免 Bing 返回 JS 渲染的空页面；`setmkt=en-US` 参数强制美式英语市场，避免 IP 地理定位导致的区域化结果（德语论坛、新加坡金价等不相关内容）
+2. **URL 解码**（`resolveBingUrl()`）：Bing 返回的重定向 URL（`bing.com/ck/a?...&u=a1aHR0cHM6Ly9...`）中 `u` 参数为 base64 编码的真实 URL，需解码后使用
+3. **摘要提取**（`extractSnippet()`）：三级降级策略 — `b_lineclamp` → `b_caption <p>` → `b_caption` 直接文本
+4. **HTML 实体解码**（`decodeHtmlEntities()`）：处理 7 种常见 HTML 实体
+5. **域过滤**：客户端侧 `allowedDomains` / `blockedDomains` 过滤，支持子域名匹配
+
+**当前状态**：`adapters/index.ts` 中 `createAdapter()` 硬编码返回 `BingSearchAdapter`，跳过了 API/Bing 自动选择逻辑（原逻辑被注释保留）。未来可通过取消注释恢复自动选择。
+
+---
+
 ## 移除反蒸馏机制 (2026-04-02)
 
 项目中发现三处 anti-distillation 相关代码，全部移除。

README.md

@@ -16,6 +16,7 @@
   - [x] Auto Mode 回归
   - [x] 所有 Feature 现在可以通过环境变量配置, 而不是垃圾的 bun --feature
   - [x] 移除牢 A 的反蒸馏代码!!!
+  - [x] 补全 web search 能力(用的 Bing 搜索)!!!
 - [ ] V5 大规模重构石山代码, 全面模块分包
   - [ ] V5 将会为全新分支, 届时 main 分支将会封存为历史版本
 

bun.lock

@@ -76,6 +76,7 @@
         "fuse.js": "^7.1.0",
         "get-east-asian-width": "^1.5.0",
         "google-auth-library": "^10.6.2",
+        "he": "^1.2.0",
         "highlight.js": "^11.11.1",
         "https-proxy-agent": "^8.0.0",
         "ignore": "^7.0.5",
@@ -947,6 +948,8 @@
 
     "hasown": ["hasown@2.0.2", "https://registry.npmmirror.com/hasown/-/hasown-2.0.2.tgz", { "dependencies": { "function-bind": "^1.1.2" } }, "sha512-0hJU9SCPvmMzIBdZFqNPXWa6dqh7WdH0cII9y+CyS8rG3nL48Bclra9HmKhVVUHyPWNH5Y7xDwAB7bfgSjkUMQ=="],
 
+    "he": ["he@1.2.0", "https://registry.npmmirror.com/he/-/he-1.2.0.tgz", { "bin": { "he": "bin/he" } }, "sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw=="],
+
     "highlight.js": ["highlight.js@11.11.1", "https://registry.npmmirror.com/highlight.js/-/highlight.js-11.11.1.tgz", {}, "sha512-Xwwo44whKBVCYoliBQwaPvtd/2tYFkRQtXDWj1nackaV2JPXx3L0+Jvd8/qCJ2p+ML0/XVkJ2q+Mr+UVdpJK5w=="],
 
     "hono": ["hono@4.12.9", "https://registry.npmmirror.com/hono/-/hono-4.12.9.tgz", {}, "sha512-wy3T8Zm2bsEvxKZM5w21VdHDDcwVS1yUFFY6i8UobSsKfFceT7TOwhbhfKsDyx7tYQlmRM5FLpIuYvNFyjctiA=="],

docs/tools/search-and-navigation.mdx

@@ -139,11 +139,137 @@ function getDeferredToolsCacheKey(deferredTools: Tools): string {
 
 AI 的信息获取不局限于本地代码：
 
-- **WebSearch**：搜索互联网获取最新信息
+- **WebSearch**（`src/tools/WebSearchTool/`）：调用 Anthropic API 的 `web_search_20250305` server tool 搜索互联网
-- **WebFetch**：抓取特定网页内容，转换为 Markdown 供 AI 阅读
+- **WebFetch**（`src/tools/WebFetchTool/`）：抓取特定 URL 内容，转换为 Markdown 供 AI 阅读
 
 这让 AI 可以查阅文档、搜索 Stack Overflow、阅读 GitHub issue——和人类开发者的工作方式一致。
 
+### WebSearch 实现机制
+
+WebSearch 通过适配器模式支持两种搜索后端，由 `src/tools/WebSearchTool/adapters/` 中的工厂函数 `createAdapter()` 选择：
+
+```
+适配器架构:
+  WebSearchTool.call()
+    → createAdapter() 选择后端
+      ├─ ApiSearchAdapter — Anthropic API 服务端搜索（需官方 API 密钥）
+      └─ BingSearchAdapter — 直接抓取 Bing 搜索页面解析（无需 API 密钥）
+    → adapter.search(query, options)
+    → 转换为统一 SearchResult[] 格式返回
+```
+
+#### 适配器选择逻辑
+
+`adapters/index.ts` 中的工厂函数按以下优先级选择后端：
+
+| 优先级 | 条件 | 适配器 |
+|--------|------|--------|
+| 1 | 环境变量 `WEB_SEARCH_ADAPTER=api` | `ApiSearchAdapter` |
+| 2 | 环境变量 `WEB_SEARCH_ADAPTER=bing` | `BingSearchAdapter` |
+| 3 | API Base URL 指向 Anthropic 官方 | `ApiSearchAdapter` |
+| 4 | 第三方代理 / 非官方端点 | `BingSearchAdapter` |
+
+适配器是无状态的，同一会话内缓存复用。
+
+#### ApiSearchAdapter — API 服务端搜索
+
+将搜索请求委托给 Anthropic API 的 `web_search_20250305` server tool：
+
+```
+调用链:
+  ApiSearchAdapter.search(query, options)
+    → queryModelWithStreaming() 发起独立的 API 调用
+      → 携带 extraToolSchemas: [BetaWebSearchTool20250305]
+      → API 服务端执行搜索，返回流式事件
+        → server_tool_use / web_search_tool_result / text 交替返回
+    → extractSearchResults() 从 content blocks 提取 SearchResult[]
+```
+
+| 特性 | 实现 |
+|------|------|
+| **模型选择** | Feature flag `tengu_plum_vx3` 控制用 Haiku（强制 tool_choice）还是主模型 |
+| **搜索上限** | 每次调用最多 8 次搜索（`max_uses: 8`） |
+| **域过滤** | 支持 `allowedDomains` / `blockedDomains` |
+| **进度追踪** | 流式解析 `input_json_delta` 提取 query，实时回调 `onProgress` |
+
+#### BingSearchAdapter — Bing 搜索页面解析
+
+直接抓取 Bing 搜索 HTML 并用正则提取结果，无需 API 密钥：
+
+```
+调用链:
+  BingSearchAdapter.search(query, options)
+    → axios.get(bing.com/search?q=...)  — 使用浏览器级别 headers 绕过反爬
+    → extractBingResults(html)
+      → 正则匹配 <li class="b_algo"> 块
+      → 提取 <h2><a> 标题和 URL
+      → resolveBingUrl() 解码 Bing 重定向链接
+      → extractSnippet() 三级降级提取摘要
+    → 客户端域过滤 (allowedDomains / blockedDomains)
+    → 返回 SearchResult[]
+```
+
+**反爬策略**：Bing 对非浏览器 UA 返回需要 JS 渲染的空页面。适配器使用完整的 Edge 浏览器请求头（包含 `Sec-Ch-Ua`、`Sec-Fetch-*` 等现代浏览器标头）确保获得完整 HTML。同时使用 `setmkt=en-US` 参数统一市场定位，避免 Bing 基于用户 IP 做区域化定向（如跳转到德语/新加坡市场导致结果不相关）。
+
+**URL 解码**：Bing 搜索结果中的 URL 为重定向格式（`bing.com/ck/a?...&u=a1aHR0cHM6Ly9...`），`resolveBingUrl()` 从 `u` 参数中 base64 解码出真实目标 URL（`a1` 前缀 = https，`a0` = http）。
+
+**摘要提取**（`extractSnippet()`）按优先级尝试三个来源：
+1. `<p class="b_lineclamp...">` — 带行截断的摘要段落
+2. `<div class="b_caption">` 内的 `<p>` — 普通摘要段落
+3. `<div class="b_caption">` 的直接文本内容 — 兜底方案
+
+| 特性 | 实现 |
+|------|------|
+| **超时** | 30 秒（`FETCH_TIMEOUT_MS`） |
+| **域过滤** | 支持 `allowedDomains` / `blockedDomains`，含子域名匹配 |
+| **进度追踪** | 发送 query_update 和 search_results_received 回调 |
+| **中止支持** | 外部 AbortSignal 传播到 axios 请求 |
+
+### WebSearchTool 统一接口
+
+`WebSearchTool`（`src/tools/WebSearchTool/WebSearchTool.ts`）是面向主循环的工具定义，所有 provider 均可使用（`isEnabled()` 始终返回 true）。它将适配器返回的 `SearchResult[]` 转换为内部 `Output` 格式，`mapToolResultToToolResultBlockParam` 将搜索结果格式化为带 markdown 超链接的文本，并附加 "REMINDER" 要求主模型在回复中包含 Sources。
+
+### WebFetch 实现机制
+
+WebFetch 是一个完整的 HTTP 客户端 + 内容处理管线：
+
+```
+调用链:
+  WebFetchTool.call({ url, prompt })
+    → getURLMarkdownContent(url)
+      → validateURL() — 长度≤2000、无用户名密码、公网域名
+      → URL_CACHE 命中检查（15 分钟 TTL LRU，50MB 上限）
+      → checkDomainBlocklist() — 调用 api.anthropic.com/api/web/domain_info 预检
+      → getWithPermittedRedirects() — axios 请求，自定义重定向处理
+        → HTML → Turndown 转 Markdown（懒加载单例，~1.4MB）
+        → 非 HTML → 原始文本
+        → 二进制（PDF 等）→ persistBinaryContent() 保存到磁盘
+    → applyPromptToMarkdown()
+      → 截断到 100K 字符
+      → queryHaiku() 用小模型按 prompt 提取信息
+    → 返回处理后的结果
+```
+
+安全防护多层设计：
+
+| 层级 | 机制 | 说明 |
+|------|------|------|
+| **域名预检** | `checkDomainBlocklist()` | 调用 `api.anthropic.com/api/web/domain_info?domain=…`，5 分钟缓存 |
+| **重定向控制** | `isPermittedRedirect()` | 仅允许同 host（±www）重定向，跨域重定向返回提示让 AI 重新调用 |
+| **重定向深度** | `MAX_REDIRECTS = 10` | 防止重定向循环无限挂起 |
+| **内容大小** | `MAX_HTTP_CONTENT_LENGTH = 10MB` | 单次响应上限 |
+| **请求超时** | `FETCH_TIMEOUT_MS = 60s` | 主请求超时；域名预检 10s |
+| **URL 验证** | `validateURL()` | 长度、协议、用户名密码、公网域名检查 |
+| **egress 检测** | `X-Proxy-Error: blocked-by-allowlist` | 检测企业代理拦截 |
+
+预批准域名（`src/tools/WebFetchTool/preapproved.ts`）：
+
+用户无需手动授权即可抓取的域名列表，包含 ~90 个主流技术文档站点（MDN、Python docs、React docs、AWS docs 等）。列表分为 hostname-only 和 path-prefix 两类，查找复杂度 O(1)。
+
+对预批准域名，WebFetch 跳过 Haiku 摘要步骤（如果内容是 Markdown 且 < 100K 字符），直接返回原文——因为技术文档本身的结构化程度已经足够好。
+
+权限模型方面，WebFetch 按 hostname 生成 `domain:xxx` 规则匹配用户的 allow/deny/ask 规则，支持用户对特定域名配置永久允许或拒绝。
+
 ### ripgrep 的流式输出
 
 对于交互式场景（如 QuickOpen），ripgrep 支持**流式输出**（`ripGrepStream()`）：

package.json

@@ -67,6 +67,7 @@
     "@aws-sdk/credential-provider-node": "^3.972.28",
     "@aws-sdk/credential-providers": "^3.1020.0",
     "@azure/identity": "^4.13.1",
+    "@biomejs/biome": "^2.4.10",
     "@commander-js/extra-typings": "^14.0.0",
     "@growthbook/growthbook": "^1.6.5",
     "@modelcontextprotocol/sdk": "^1.29.0",
@@ -90,6 +91,13 @@
     "@opentelemetry/semantic-conventions": "^1.40.0",
     "@smithy/core": "^3.23.13",
     "@smithy/node-http-handler": "^4.5.1",
+    "@types/bun": "^1.3.11",
+    "@types/cacache": "^20.0.1",
+    "@types/plist": "^3.0.5",
+    "@types/react": "^19.2.14",
+    "@types/react-reconciler": "^0.33.0",
+    "@types/sharp": "^0.32.0",
+    "@types/turndown": "^5.0.6",
     "ajv": "^8.18.0",
     "asciichart": "^1.5.25",
     "audio-capture-napi": "workspace:*",
@@ -112,12 +120,14 @@
     "fuse.js": "^7.1.0",
     "get-east-asian-width": "^1.5.0",
     "google-auth-library": "^10.6.2",
+    "he": "^1.2.0",
     "highlight.js": "^11.11.1",
     "https-proxy-agent": "^8.0.0",
     "ignore": "^7.0.5",
     "image-processor-napi": "workspace:*",
     "indent-string": "^5.0.0",
     "jsonc-parser": "^3.3.1",
+    "knip": "^6.1.1",
     "lodash-es": "^4.17.23",
     "lru-cache": "^11.2.7",
     "marked": "^17.0.5",
@@ -140,6 +150,7 @@
     "tree-kill": "^1.2.2",
     "turndown": "^7.2.2",
     "type-fest": "^5.5.0",
+    "typescript": "^6.0.2",
     "undici": "^7.24.6",
     "url-handler-napi": "workspace:*",
     "usehooks-ts": "^3.1.1",
@@ -150,16 +161,6 @@
     "ws": "^8.20.0",
     "xss": "^1.0.15",
     "yaml": "^2.8.3",
-    "zod": "^4.3.6",
+    "zod": "^4.3.6"
-    "@biomejs/biome": "^2.4.10",
-    "@types/bun": "^1.3.11",
-    "@types/cacache": "^20.0.1",
-    "@types/plist": "^3.0.5",
-    "@types/react": "^19.2.14",
-    "@types/react-reconciler": "^0.33.0",
-    "@types/sharp": "^0.32.0",
-    "@types/turndown": "^5.0.6",
-    "knip": "^6.1.1",
-    "typescript": "^6.0.2"
   }
 }

src/tools/WebFetchTool/utils.ts

@@ -384,7 +384,7 @@ export async function getURLMarkdownContent(
     // This is for enterprise customers with restrictive security policies
     // that prevent outbound connections to claude.ai
     const settings = getSettings_DEPRECATED()
-    if (!settings.skipWebFetchPreflight) {
+    if (settings.skipWebFetchPreflight === false) {
       const checkResult = await checkDomainBlocklist(hostname)
       switch (checkResult.status) {
         case 'allowed':

src/tools/WebSearchTool/WebSearchTool.ts

@@ -1,19 +1,9 @@
-import type {
-  BetaContentBlock,
-  BetaWebSearchTool20250305,
-} from '@anthropic-ai/sdk/resources/beta/messages/messages.mjs'
-import { getAPIProvider } from 'src/utils/model/providers.js'
 import type { PermissionResult } from 'src/utils/permissions/PermissionResult.js'
 import { z } from 'zod/v4'
-import { getFeatureValue_CACHED_MAY_BE_STALE } from '../../services/analytics/growthbook.js'
-import { queryModelWithStreaming } from '../../services/api/claude.js'
 import { buildTool, type ToolDef } from '../../Tool.js'
 import { lazySchema } from '../../utils/lazySchema.js'
-import { logError } from '../../utils/log.js'
+import { jsonStringify } from '../../utils/slowOperations.js'
-import { createUserMessage } from '../../utils/messages.js'
+import { createAdapter } from './adapters/index.js'
-import { getMainLoopModel, getSmallFastModel } from '../../utils/model/model.js'
-import { jsonParse, jsonStringify } from '../../utils/slowOperations.js'
-import { asSystemPrompt } from '../../utils/systemPromptType.js'
 import { getWebSearchPrompt, WEB_SEARCH_TOOL_NAME } from './prompt.js'
 import {
   getToolUseSummary,
@@ -37,12 +27,11 @@ const inputSchema = lazySchema(() =>
 )
 type InputSchema = ReturnType<typeof inputSchema>
 
-type Input = z.infer<InputSchema>
-
 const searchResultSchema = lazySchema(() => {
   const searchHitSchema = z.object({
     title: z.string().describe('The title of the search result'),
     url: z.string().describe('The URL of the search result'),
+    snippet: z.string().optional().describe('A short description of the search result'),
   })
 
   return z.object({
@@ -73,82 +62,6 @@ export type { WebSearchProgress } from '../../types/tools.js'
 
 import type { WebSearchProgress } from '../../types/tools.js'
 
-function makeToolSchema(input: Input): BetaWebSearchTool20250305 {
-  return {
-    type: 'web_search_20250305',
-    name: 'web_search',
-    allowed_domains: input.allowed_domains,
-    blocked_domains: input.blocked_domains,
-    max_uses: 8, // Hardcoded to 8 searches maximum
-  }
-}
-
-function makeOutputFromSearchResponse(
-  result: BetaContentBlock[],
-  query: string,
-  durationSeconds: number,
-): Output {
-  // The result is a sequence of these blocks:
-  // - text to start -- always?
-  // [
-  //    - server_tool_use
-  //    - web_search_tool_result
-  //    - text and citation blocks intermingled
-  //  ]+  (this block repeated for each search)
-
-  const results: (SearchResult | string)[] = []
-  let textAcc = ''
-  let inText = true
-
-  for (const block of result) {
-    if (block.type === 'server_tool_use') {
-      if (inText) {
-        inText = false
-        if (textAcc.trim().length > 0) {
-          results.push(textAcc.trim())
-        }
-        textAcc = ''
-      }
-      continue
-    }
-
-    if (block.type === 'web_search_tool_result') {
-      // Handle error case - content is a WebSearchToolResultError
-      if (!Array.isArray(block.content)) {
-        const errorMessage = `Web search error: ${block.content.error_code}`
-        logError(new Error(errorMessage))
-        results.push(errorMessage)
-        continue
-      }
-      // Success case - add results to our collection
-      const hits = block.content.map(r => ({ title: r.title, url: r.url }))
-      results.push({
-        tool_use_id: block.tool_use_id,
-        content: hits,
-      })
-    }
-
-    if (block.type === 'text') {
-      if (inText) {
-        textAcc += block.text
-      } else {
-        inText = true
-        textAcc = block.text
-      }
-    }
-  }
-
-  if (textAcc.length) {
-    results.push(textAcc.trim())
-  }
-
-  return {
-    query,
-    results,
-    durationSeconds,
-  }
-}
-
 export const WebSearchTool = buildTool({
   name: WEB_SEARCH_TOOL_NAME,
   searchHint: 'search the web for current information',
@@ -166,30 +79,9 @@ export const WebSearchTool = buildTool({
     return summary ? `Searching for ${summary}` : 'Searching the web'
   },
   isEnabled() {
-    const provider = getAPIProvider()
+    // Always enabled — the adapter factory selects the appropriate backend
-    const model = getMainLoopModel()
+    // (API server-side search or Bing fallback) based on provider capabilities.
-
+    return true
-    // Enable for firstParty
-    if (provider === 'firstParty') {
-      return true
-    }
-
-    // Enable for Vertex AI with supported models (Claude 4.0+)
-    if (provider === 'vertex') {
-      const supportsWebSearch =
-        model.includes('claude-opus-4') ||
-        model.includes('claude-sonnet-4') ||
-        model.includes('claude-haiku-4')
-
-      return supportsWebSearch
-    }
-
-    // Foundry only ships models that already support Web Search
-    if (provider === 'foundry') {
-      return true
-    }
-
-    return false
   },
   get inputSchema(): InputSchema {
     return inputSchema()
@@ -227,9 +119,6 @@ export const WebSearchTool = buildTool({
   renderToolUseProgressMessage,
   renderToolResultMessage,
   extractSearchText() {
-    // renderToolResultMessage shows only "Did N searches in Xs" chrome —
-    // the results[] content never appears on screen. Heuristic would index
-    // string entries in results[] (phantom match). Nothing to search.
     return ''
   },
   async validateInput(input) {
@@ -254,149 +143,42 @@ export const WebSearchTool = buildTool({
   async call(input, context, _canUseTool, _parentMessage, onProgress) {
     const startTime = performance.now()
     const { query } = input
-    const userMessage = createUserMessage({
-      content: 'Perform a web search for the query: ' + query,
-    })
-    const toolSchema = makeToolSchema(input)
 
-    const useHaiku = getFeatureValue_CACHED_MAY_BE_STALE(
+    const adapter = createAdapter()
-      'tengu_plum_vx3',
+    const adapterResults = await adapter.search(query, {
-      false,
+      allowedDomains: input.allowed_domains,
-    )
+      blockedDomains: input.blocked_domains,
-
-    const appState = context.getAppState()
-    const queryStream = queryModelWithStreaming({
-      messages: [userMessage],
-      systemPrompt: asSystemPrompt([
-        'You are an assistant for performing a web search tool use',
-      ]),
-      thinkingConfig: useHaiku
-        ? { type: 'disabled' as const }
-        : context.options.thinkingConfig,
-      tools: [],
       signal: context.abortController.signal,
-      options: {
+      onProgress(progress) {
-        getToolPermissionContext: async () => appState.toolPermissionContext,
+        if (onProgress) {
-        model: useHaiku ? getSmallFastModel() : context.options.mainLoopModel,
+          const progressCounter = Date.now()
-        toolChoice: useHaiku ? { type: 'tool', name: 'web_search' } : undefined,
+          onProgress({
-        isNonInteractiveSession: context.options.isNonInteractiveSession,
+            toolUseID: `search-progress-${progressCounter}`,
-        hasAppendSystemPrompt: !!context.options.appendSystemPrompt,
+            data: progress,
-        extraToolSchemas: [toolSchema],
+          })
-        querySource: 'web_search_tool',
+        }
-        agents: context.options.agentDefinitions.activeAgents,
-        mcpTools: [],
-        agentId: context.agentId,
-        effortValue: appState.effortValue,
       },
     })
 
-    const allContentBlocks: BetaContentBlock[] = []
-    let currentToolUseId = null
-    let currentToolUseJson = ''
-    let progressCounter = 0
-    const toolUseQueries = new Map() // Map of tool_use_id to query
-
-    for await (const event of queryStream) {
-      if (event.type === 'assistant') {
-        const msg = event as { message: { content: BetaContentBlock[] } }
-        allContentBlocks.push(...msg.message.content)
-        continue
-      }
-
-      // Track tool use ID when server_tool_use starts
-      if (
-        event.type === 'stream_event'
-      ) {
-        const streamEvt = event as { event?: { type: string; content_block?: { type: string; id?: string; tool_use_id?: string; content?: unknown; [key: string]: unknown }; delta?: { type: string; partial_json?: string; [key: string]: unknown }; [key: string]: unknown } }
-        if (streamEvt.event?.type === 'content_block_start') {
-        const contentBlock = streamEvt.event.content_block
-        if (contentBlock && contentBlock.type === 'server_tool_use') {
-          currentToolUseId = contentBlock.id as string
-          currentToolUseJson = ''
-          // Note: The ServerToolUseBlock doesn't contain input.query
-          // The actual query comes through input_json_delta events
-          continue
-        }
-      }
-
-      // Accumulate JSON for current tool use
-      if (
-        currentToolUseId &&
-        streamEvt.event?.type === 'content_block_delta'
-      ) {
-        const delta = streamEvt.event.delta
-        if (delta?.type === 'input_json_delta' && delta.partial_json) {
-          currentToolUseJson += delta.partial_json
-
-          // Try to extract query from partial JSON for progress updates
-          try {
-            // Look for a complete query field
-            const queryMatch = currentToolUseJson.match(
-              /"query"\s*:\s*"((?:[^"\\]|\\.)*)"/,
-            )
-            if (queryMatch && queryMatch[1]) {
-              // The regex properly handles escaped characters
-              const query = jsonParse('"' + queryMatch[1] + '"')
-
-              if (
-                !toolUseQueries.has(currentToolUseId) ||
-                toolUseQueries.get(currentToolUseId) !== query
-              ) {
-                toolUseQueries.set(currentToolUseId, query)
-                progressCounter++
-                if (onProgress) {
-                  onProgress({
-                    toolUseID: `search-progress-${progressCounter}`,
-                    data: {
-                      type: 'query_update',
-                      query,
-                    },
-                  })
-                }
-              }
-            }
-          } catch {
-            // Ignore parsing errors for partial JSON
-          }
-        }
-      }
-
-      // Yield progress when search results come in
-      if (
-        streamEvt.event?.type === 'content_block_start'
-      ) {
-        const contentBlock = streamEvt.event.content_block
-        if (contentBlock && contentBlock.type === 'web_search_tool_result') {
-          // Get the actual query that was used for this search
-          const toolUseId = contentBlock.tool_use_id
-          const actualQuery = toolUseQueries.get(toolUseId) || query
-          const content = contentBlock.content
-
-          progressCounter++
-          if (onProgress) {
-            onProgress({
-              toolUseID: toolUseId || `search-progress-${progressCounter}`,
-              data: {
-                type: 'search_results_received',
-                resultCount: Array.isArray(content) ? content.length : 0,
-                query: actualQuery,
-              },
-            })
-          }
-        }
-      }
-      } // end stream_event
-    }
-
-    // Process the final result
     const endTime = performance.now()
     const durationSeconds = (endTime - startTime) / 1000
 
-    const data = makeOutputFromSearchResponse(
+    // Convert adapter SearchResult[] to legacy Output format
-      allContentBlocks,
+    const results: (SearchResult | string)[] = []
+    if (adapterResults.length > 0) {
+      results.push({
+        tool_use_id: 'adapter-search-1',
+        content: adapterResults.map(r => ({ title: r.title, url: r.url, snippet: r.snippet })),
+      })
+    } else {
+      results.push('No search results found.')
+    }
+
+    const data: Output = {
       query,
+      results,
       durationSeconds,
-    )
+    }
     return { data }
   },
   mapToolResultToToolResultBlockParam(output, toolUseID) {
@@ -404,20 +186,23 @@ export const WebSearchTool = buildTool({
 
     let formattedOutput = `Web search results for query: "${query}"\n\n`
 
-    // Process the results array - it can contain both string summaries and search result objects.
-    // Guard against null/undefined entries that can appear after JSON round-tripping
-    // (e.g., from compaction or transcript deserialization).
     ;(results ?? []).forEach(result => {
       if (result == null) {
         return
       }
       if (typeof result === 'string') {
-        // Text summary
         formattedOutput += result + '\n\n'
       } else {
-        // Search result with links
         if (result.content?.length > 0) {
-          formattedOutput += `Links: ${jsonStringify(result.content)}\n\n`
+          formattedOutput += 'Links:\n'
+          for (const link of result.content) {
+            formattedOutput += `  - [${link.title}](${link.url})`
+            if (link.snippet) {
+              formattedOutput += `: ${link.snippet}`
+            }
+            formattedOutput += '\n'
+          }
+          formattedOutput += '\n'
         } else {
           formattedOutput += 'No links found.\n\n'
         }

src/tools/WebSearchTool/__tests__/bingAdapter.integration.ts

@@ -0,0 +1,82 @@
+/**
+ * Integration test for BingSearchAdapter — hits the real Bing search.
+ *
+ * Usage:
+ *   bun run src/tools/WebSearchTool/__tests__/bingAdapter.integration.ts
+ *
+ * Optional env vars:
+ *   BING_QUERY  — search query (default: "Claude AI Anthropic")
+ */
+
+// Provide MACRO globals needed by the codebase when running outside dev mode
+if (!globalThis.MACRO) {
+  globalThis.MACRO = { VERSION: '0.0.0-test', BUILD_TIME: '0' } as any
+}
+
+import { BingSearchAdapter, extractBingResults } from '../adapters/bingAdapter'
+
+const query = process.env.BING_QUERY || 'Claude AI Anthropic'
+
+async function main() {
+  console.log(`\n🔍 Searching Bing for: "${query}"\n`)
+
+  const adapter = new BingSearchAdapter()
+  const startTime = Date.now()
+
+  const results = await adapter.search(query, {
+    onProgress: (p) => {
+      if (p.type === 'query_update') {
+        console.log(`  → Query sent: ${p.query}`)
+      }
+      if (p.type === 'search_results_received') {
+        console.log(`  → Received ${p.resultCount} results`)
+      }
+    },
+  })
+
+  const elapsed = Date.now() - startTime
+  console.log(`\n✅ Done in ${elapsed}ms — ${results.length} result(s)\n`)
+
+  if (results.length === 0) {
+    console.log('⚠️  No results returned. Possible causes:')
+    console.log('   - Bing returned a CAPTCHA or rate-limited the request')
+    console.log('   - Network/firewall issue')
+    console.log('   - Bing HTML structure changed')
+    console.log('   - Anti-bot detection triggered\n')
+    process.exit(1)
+  }
+
+  for (const [i, r] of results.entries()) {
+    console.log(`  ${i + 1}. ${r.title}`)
+    console.log(`     ${r.url}`)
+    if (r.snippet) {
+      const snippet = r.snippet.replace(/\n/g, ' ')
+      console.log(`     ${snippet.slice(0, 150)}${snippet.length > 150 ? '…' : ''}`)
+    }
+    console.log()
+  }
+
+  // Validate result structure
+  let passed = true
+  for (const [i, r] of results.entries()) {
+    if (!r.title || typeof r.title !== 'string') {
+      console.error(`❌ Result ${i + 1}: missing or non-string title`, r)
+      passed = false
+    }
+    if (!r.url || !r.url.startsWith('http')) {
+      console.error(`❌ Result ${i + 1}: missing or non-http url`, r)
+      passed = false
+    }
+  }
+
+  if (passed) {
+    console.log('✅ All results have valid structure.\n')
+  } else {
+    process.exit(1)
+  }
+}
+
+main().catch((e) => {
+  console.error('❌ Fatal error:', e)
+  process.exit(1)
+})

src/tools/WebSearchTool/__tests__/bingAdapter.test.ts

@@ -0,0 +1,499 @@
+import { describe, expect, mock, test } from 'bun:test'
+import { extractBingResults, decodeHtmlEntities } from '../adapters/bingAdapter'
+
+// ---------------------------------------------------------------------------
+// decodeHtmlEntities
+// ---------------------------------------------------------------------------
+
+describe('decodeHtmlEntities', () => {
+  test('decodes common named entities', () => {
+    expect(decodeHtmlEntities('&amp; &lt; &gt;')).toBe('& < >')
+  })
+
+  test('decodes quote entities', () => {
+    expect(decodeHtmlEntities('&quot;hello&quot;')).toBe('"hello"')
+  })
+
+  test('decodes numeric and hex apostrophe entities', () => {
+    expect(decodeHtmlEntities('&#39;it&#x27;s')).toBe("'it's")
+  })
+
+  test('decodes &nbsp; to non-breaking space (\\u00A0)', () => {
+    expect(decodeHtmlEntities('a&nbsp;b')).toBe('a\u00A0b')
+  })
+
+  test('returns plain text unchanged', () => {
+    expect(decodeHtmlEntities('hello world')).toBe('hello world')
+  })
+
+  test('handles empty string', () => {
+    expect(decodeHtmlEntities('')).toBe('')
+  })
+
+  test('decodes multiple occurrences of the same entity', () => {
+    expect(decodeHtmlEntities('a&amp;b&amp;c')).toBe('a&b&c')
+  })
+
+  test('handles mixed entities in one string', () => {
+    expect(decodeHtmlEntities('&lt;a&nbsp;href=&quot;x&quot;&gt;')).toBe('<a\u00A0href="x">')
+  })
+})
+
+// ---------------------------------------------------------------------------
+// extractBingResults
+// ---------------------------------------------------------------------------
+
+describe('extractBingResults', () => {
+  test('extracts results from standard Bing HTML', () => {
+    const html = `
+      <ol id="b_results">
+        <li class="b_algo">
+          <h2><a href="https://example.com/page1" h="ID=SERP,1">Example Title 1</a></h2>
+          <div class="b_caption">
+            <p class="b_lineclamp">First result description</p>
+          </div>
+        </li>
+        <li class="b_algo">
+          <h2><a href="https://example.com/page2" h="ID=SERP,2">Example Title 2</a></h2>
+          <div class="b_caption">
+            <p class="b_lineclamp">Second result description</p>
+          </div>
+        </li>
+      </ol>
+    `
+    const results = extractBingResults(html)
+    expect(results).toHaveLength(2)
+    expect(results[0]).toEqual({
+      title: 'Example Title 1',
+      url: 'https://example.com/page1',
+      snippet: 'First result description',
+    })
+    expect(results[1]).toEqual({
+      title: 'Example Title 2',
+      url: 'https://example.com/page2',
+      snippet: 'Second result description',
+    })
+  })
+
+  test('returns empty array when no b_algo blocks exist', () => {
+    const html = `
+      <ol id="b_results">
+        <li class="b_ad">Ad result</li>
+        <li class="b_ans">Answer card</li>
+      </ol>
+    `
+    expect(extractBingResults(html)).toEqual([])
+  })
+
+  test('returns empty array for empty HTML', () => {
+    expect(extractBingResults('')).toEqual([])
+  })
+
+  test('returns empty array for unrelated HTML', () => {
+    expect(extractBingResults('<html><body>Hello</body></html>')).toEqual([])
+  })
+
+  test('skips Bing-internal links', () => {
+    const html = `
+      <li class="b_algo">
+        <h2><a href="/search?q=more">More results</a></h2>
+      </li>
+      <li class="b_algo">
+        <h2><a href="https://www.bing.com/videos">Bing Videos</a></h2>
+      </li>
+      <li class="b_algo">
+        <h2><a href="#anchor">Jump link</a></h2>
+      </li>
+    `
+    expect(extractBingResults(html)).toEqual([])
+  })
+
+  test('strips HTML tags from titles', () => {
+    const html = `
+      <li class="b_algo">
+        <h2><a href="https://example.com">Result with <strong>bold</strong> and <em>italic</em></a></h2>
+      </li>
+    `
+    const results = extractBingResults(html)
+    expect(results).toHaveLength(1)
+    expect(results[0].title).toBe('Result with bold and italic')
+  })
+
+  test('decodes HTML entities in titles', () => {
+    const html = `
+      <li class="b_algo">
+        <h2><a href="https://example.com">Tom &amp; Jerry &lt;cartoon&gt;</a></h2>
+      </li>
+    `
+    const results = extractBingResults(html)
+    expect(results[0].title).toBe('Tom & Jerry <cartoon>')
+  })
+
+  test('extracts snippet from b_lineclamp class', () => {
+    const html = `
+      <li class="b_algo">
+        <h2><a href="https://example.com">Title</a></h2>
+        <p class="b_lineclamp3 b_algo_slug">Lineclamp snippet text here</p>
+      </li>
+    `
+    const results = extractBingResults(html)
+    expect(results[0].snippet).toBe('Lineclamp snippet text here')
+  })
+
+  test('extracts snippet from b_caption paragraph fallback', () => {
+    const html = `
+      <li class="b_algo">
+        <h2><a href="https://example.com">Title</a></h2>
+        <div class="b_caption">
+          <p>Caption paragraph text</p>
+        </div>
+      </li>
+    `
+    const results = extractBingResults(html)
+    expect(results[0].snippet).toBe('Caption paragraph text')
+  })
+
+  test('extracts snippet from b_caption div fallback', () => {
+    const html = `
+      <li class="b_algo">
+        <h2><a href="https://example.com">Title</a></h2>
+        <div class="b_caption">Direct caption text without p tag</div>
+      </li>
+    `
+    const results = extractBingResults(html)
+    expect(results[0].snippet).toBe('Direct caption text without p tag')
+  })
+
+  test('returns undefined snippet when no caption exists', () => {
+    const html = `
+      <li class="b_algo">
+        <h2><a href="https://example.com">Title Only</a></h2>
+      </li>
+    `
+    const results = extractBingResults(html)
+    expect(results[0].snippet).toBeUndefined()
+  })
+
+  test('handles mixed result types and only extracts b_algo', () => {
+    const html = `
+      <ol id="b_results">
+        <li class="b_ad"><h2><a href="https://ad.com">Ad Title</a></h2></li>
+        <li class="b_algo">
+          <h2><a href="https://real-result.com">Real Result</a></h2>
+          <p class="b_lineclamp">A real snippet</p>
+        </li>
+        <li class="b_ans"><div>People also ask</div></li>
+        <li class="b_algo">
+          <h2><a href="https://another.com">Another Result</a></h2>
+        </li>
+      </ol>
+    `
+    const results = extractBingResults(html)
+    expect(results).toHaveLength(2)
+    expect(results[0].title).toBe('Real Result')
+    expect(results[1].title).toBe('Another Result')
+  })
+
+  test('skips b_algo blocks without h2 > a structure', () => {
+    const html = `
+      <li class="b_algo">
+        <div>No link here</div>
+      </li>
+      <li class="b_algo">
+        <h2><a href="https://example.com">Valid Result</a></h2>
+      </li>
+    `
+    const results = extractBingResults(html)
+    expect(results).toHaveLength(1)
+    expect(results[0].title).toBe('Valid Result')
+  })
+
+  test('handles extra whitespace in h2 > a structure', () => {
+    const html = `
+      <li class="b_algo">
+        <h2>
+          <a href="https://example.com"  h="ID=SERP,1"  >
+            Whitespace  Title
+          </a>
+        </h2>
+      </li>
+    `
+    const results = extractBingResults(html)
+    expect(results).toHaveLength(1)
+    expect(results[0].title).toBe('Whitespace  Title')
+  })
+
+  test('handles snippet with HTML entities', () => {
+    const html = `
+      <li class="b_algo">
+        <h2><a href="https://example.com">Title</a></h2>
+        <p class="b_lineclamp">5 &lt; 10 &amp; 10 &gt; 5</p>
+      </li>
+    `
+    const results = extractBingResults(html)
+    expect(results[0].snippet).toBe('5 < 10 & 10 > 5')
+  })
+
+  test('handles real-world Bing HTML structure', () => {
+    const html = `
+      <ol id="b_results" role="main">
+        <li class="b_algo" data-id="">
+          <div class="b_title">
+            <h2>
+              <a href="https://docs.python.org/3/tutorial/index.html" target="_blank" h="ID=SERP,5125.1">
+                Python Tutorial
+              </a>
+            </h2>
+          </div>
+          <div class="b_caption">
+            <div class="b_attribution" u="0|5125|4976674477245">
+              <cite>https://docs.python.org</cite>
+            </div>
+            <p class="b_lineclamp3">
+              Welcome to the Python Tutorial. This tutorial introduces you to the basic concepts and features...
+            </p>
+          </div>
+        </li>
+        <li class="b_algo">
+          <h2>
+            <a href="https://realpython.com/python-guide/" h="ID=SERP,5125.2">
+              Real Python Guide
+            </a>
+          </h2>
+          <div class="b_caption">
+            <div class="b_attribution">
+              <cite>https://realpython.com</cite>
+            </div>
+            <p>
+              The ultimate Python guide for beginners and experts alike.
+            </p>
+          </div>
+        </li>
+      </ol>
+    `
+    const results = extractBingResults(html)
+    expect(results).toHaveLength(2)
+    expect(results[0].title).toBe('Python Tutorial')
+    expect(results[0].url).toBe('https://docs.python.org/3/tutorial/index.html')
+    expect(results[0].snippet).toContain('Welcome to the Python Tutorial')
+    expect(results[1].title).toBe('Real Python Guide')
+    expect(results[1].snippet).toContain('ultimate Python guide')
+  })
+})
+
+// ---------------------------------------------------------------------------
+// BingSearchAdapter.search (integration with mocked axios)
+// ---------------------------------------------------------------------------
+
+describe('BingSearchAdapter.search', () => {
+  // Dynamic import so mock.module() takes effect
+  const createAdapter = async () => {
+    const { BingSearchAdapter } = await import('../adapters/bingAdapter')
+    return new BingSearchAdapter()
+  }
+
+  const SAMPLE_HTML = `
+    <ol id="b_results">
+      <li class="b_algo">
+        <h2><a href="https://example.com/result1">Result One</a></h2>
+        <p class="b_lineclamp">Snippet one</p>
+      </li>
+      <li class="b_algo">
+        <h2><a href="https://example.com/result2">Result Two</a></h2>
+        <p class="b_lineclamp">Snippet two</p>
+      </li>
+    </ol>
+  `
+
+  test('returns parsed results from fetched HTML', async () => {
+    mock.module('axios', () => ({
+      default: {
+        get: mock(() => Promise.resolve({ data: SAMPLE_HTML })),
+        isCancel: () => false,
+      },
+    }))
+    mock.module('../../../utils/http', () => ({
+      getWebFetchUserAgent: () => 'TestAgent/1.0',
+    }))
+
+    const adapter = await createAdapter()
+    const results = await adapter.search('test query', {})
+    expect(results).toHaveLength(2)
+    expect(results[0].title).toBe('Result One')
+    expect(results[1].title).toBe('Result Two')
+  })
+
+  test('calls onProgress with query_update and search_results_received', async () => {
+    mock.module('axios', () => ({
+      default: {
+        get: mock(() => Promise.resolve({ data: SAMPLE_HTML })),
+        isCancel: () => false,
+      },
+    }))
+    mock.module('../../../utils/http', () => ({
+      getWebFetchUserAgent: () => 'TestAgent/1.0',
+    }))
+
+    const progressCalls: any[] = []
+    const onProgress = (p: any) => progressCalls.push(p)
+
+    const adapter = await createAdapter()
+    await adapter.search('test', { onProgress })
+
+    expect(progressCalls).toHaveLength(2)
+    expect(progressCalls[0].type).toBe('query_update')
+    expect(progressCalls[0].query).toBe('test')
+    expect(progressCalls[1].type).toBe('search_results_received')
+    expect(progressCalls[1].resultCount).toBe(2)
+  })
+
+  test('filters results by allowedDomains', async () => {
+    const mixedHtml = `
+      <ol id="b_results">
+        <li class="b_algo">
+          <h2><a href="https://allowed.com/a">Allowed Result</a></h2>
+        </li>
+        <li class="b_algo">
+          <h2><a href="https://blocked.com/b">Blocked Result</a></h2>
+        </li>
+      </ol>
+    `
+    mock.module('axios', () => ({
+      default: {
+        get: mock(() => Promise.resolve({ data: mixedHtml })),
+        isCancel: () => false,
+      },
+    }))
+    mock.module('../../../utils/http', () => ({
+      getWebFetchUserAgent: () => 'TestAgent/1.0',
+    }))
+
+    const adapter = await createAdapter()
+    const results = await adapter.search('test', {
+      allowedDomains: ['allowed.com'],
+    })
+    expect(results).toHaveLength(1)
+    expect(results[0].url).toBe('https://allowed.com/a')
+  })
+
+  test('filters results by blockedDomains', async () => {
+    const mixedHtml = `
+      <ol id="b_results">
+        <li class="b_algo">
+          <h2><a href="https://good.com/a">Good Result</a></h2>
+        </li>
+        <li class="b_algo">
+          <h2><a href="https://spam.com/b">Spam Result</a></h2>
+        </li>
+      </ol>
+    `
+    mock.module('axios', () => ({
+      default: {
+        get: mock(() => Promise.resolve({ data: mixedHtml })),
+        isCancel: () => false,
+      },
+    }))
+    mock.module('../../../utils/http', () => ({
+      getWebFetchUserAgent: () => 'TestAgent/1.0',
+    }))
+
+    const adapter = await createAdapter()
+    const results = await adapter.search('test', {
+      blockedDomains: ['spam.com'],
+    })
+    expect(results).toHaveLength(1)
+    expect(results[0].url).toBe('https://good.com/a')
+  })
+
+  test('filters subdomains with allowedDomains', async () => {
+    const html = `
+      <ol id="b_results">
+        <li class="b_algo">
+          <h2><a href="https://docs.example.com/page">Subdomain Result</a></h2>
+        </li>
+        <li class="b_algo">
+          <h2><a href="https://other.com/page">Other Result</a></h2>
+        </li>
+      </ol>
+    `
+    mock.module('axios', () => ({
+      default: {
+        get: mock(() => Promise.resolve({ data: html })),
+        isCancel: () => false,
+      },
+    }))
+    mock.module('../../../utils/http', () => ({
+      getWebFetchUserAgent: () => 'TestAgent/1.0',
+    }))
+
+    const adapter = await createAdapter()
+    const results = await adapter.search('test', {
+      allowedDomains: ['example.com'],
+    })
+    expect(results).toHaveLength(1)
+    expect(results[0].url).toBe('https://docs.example.com/page')
+  })
+
+  test('throws AbortError when signal is already aborted', async () => {
+    mock.module('axios', () => ({
+      default: {
+        get: mock((_url: string, config: any) => {
+          if (config?.signal?.aborted) {
+            const err = new Error('canceled')
+            ;(err as any).__CANCEL__ = true
+            return Promise.reject(err)
+          }
+          return Promise.resolve({ data: SAMPLE_HTML })
+        }),
+        isCancel: (e: any) => e?.__CANCEL__ === true,
+      },
+    }))
+    mock.module('../../../utils/http', () => ({
+      getWebFetchUserAgent: () => 'TestAgent/1.0',
+    }))
+
+    const adapter = await createAdapter()
+    const controller = new AbortController()
+    controller.abort()
+
+    const { AbortError } = await import('../../../utils/errors')
+    await expect(
+      adapter.search('test', { signal: controller.signal }),
+    ).rejects.toThrow(AbortError)
+  })
+
+  test('re-throws non-abort axios errors', async () => {
+    const networkError = new Error('Network error')
+    mock.module('axios', () => ({
+      default: {
+        get: mock(() => Promise.reject(networkError)),
+        isCancel: () => false,
+      },
+    }))
+    mock.module('../../../utils/http', () => ({
+      getWebFetchUserAgent: () => 'TestAgent/1.0',
+    }))
+
+    const adapter = await createAdapter()
+    await expect(adapter.search('test', {})).rejects.toThrow('Network error')
+  })
+
+  test('encodes query parameter in URL', async () => {
+    const axiosGet = mock(() => Promise.resolve({ data: SAMPLE_HTML }))
+    mock.module('axios', () => ({
+      default: {
+        get: axiosGet,
+        isCancel: () => false,
+      },
+    }))
+    mock.module('../../../utils/http', () => ({
+      getWebFetchUserAgent: () => 'TestAgent/1.0',
+    }))
+
+    const adapter = await createAdapter()
+    await adapter.search('hello world & special=chars', {})
+
+    const calledUrl = axiosGet.mock.calls[0][0] as string
+    expect(calledUrl).toContain('q=hello%20world%20%26%20special%3Dchars')
+  })
+})

src/tools/WebSearchTool/adapters/apiAdapter.ts

@@ -0,0 +1,173 @@
+/**
+ * API-based search adapter — delegates to Anthropic's server-side
+ * web_search_20250305 tool via a secondary API call.
+ */
+
+import type {
+  BetaContentBlock,
+  BetaWebSearchTool20250305,
+} from '@anthropic-ai/sdk/resources/beta/messages/messages.mjs'
+import { getFeatureValue_CACHED_MAY_BE_STALE } from '../../../services/analytics/growthbook.js'
+import { queryModelWithStreaming } from '../../../services/api/claude.js'
+import { createUserMessage } from '../../../utils/messages.js'
+import { getMainLoopModel, getSmallFastModel } from '../../../utils/model/model.js'
+import { jsonParse } from '../../../utils/slowOperations.js'
+import { asSystemPrompt } from '../../../utils/systemPromptType.js'
+import type { SearchResult, SearchOptions, WebSearchAdapter } from './types.js'
+
+function makeToolSchema(input: { allowedDomains?: string[]; blockedDomains?: string[] }): BetaWebSearchTool20250305 {
+  return {
+    type: 'web_search_20250305',
+    name: 'web_search',
+    allowed_domains: input.allowedDomains,
+    blocked_domains: input.blockedDomains,
+    max_uses: 8,
+  }
+}
+
+export class ApiSearchAdapter implements WebSearchAdapter {
+  async search(
+    query: string,
+    options: SearchOptions,
+  ): Promise<SearchResult[]> {
+    const { signal, onProgress, allowedDomains, blockedDomains } = options
+
+    const userMessage = createUserMessage({
+      content: 'Perform a web search for the query: ' + query,
+    })
+    const toolSchema = makeToolSchema({ allowedDomains, blockedDomains })
+
+    const useHaiku = getFeatureValue_CACHED_MAY_BE_STALE('tengu_plum_vx3', false)
+
+    const queryStream = queryModelWithStreaming({
+      messages: [userMessage],
+      systemPrompt: asSystemPrompt([
+        'You are an assistant for performing a web search tool use',
+      ]),
+      thinkingConfig: useHaiku
+        ? { type: 'disabled' as const }
+        : { type: 'enabled' as const, budgetTokens: 10000 },
+      tools: [],
+      signal: signal ?? new AbortController().signal,
+      options: {
+        getToolPermissionContext: async () => ({
+          mode: 'default' as const,
+          additionalWorkingDirectories: new Map(),
+          alwaysAllowRules: {},
+          alwaysDenyRules: {},
+          alwaysAskRules: {},
+          isBypassPermissionsModeAvailable: false,
+        }),
+        model: useHaiku ? getSmallFastModel() : getMainLoopModel(),
+        toolChoice: useHaiku ? { type: 'tool' as const, name: 'web_search' } : undefined,
+        isNonInteractiveSession: false,
+        hasAppendSystemPrompt: false,
+        extraToolSchemas: [toolSchema],
+        querySource: 'web_search_tool' as const,
+        agents: [],
+        mcpTools: [],
+        agentId: undefined,
+        effortValue: undefined,
+      },
+    })
+
+    const allContentBlocks: BetaContentBlock[] = []
+    let currentToolUseId: string | null = null
+    let currentToolUseJson = ''
+    const toolUseQueries = new Map<string, string>()
+    let progressCounter = 0
+
+    for await (const event of queryStream) {
+      if (event.type === 'assistant') {
+        const msg = event as { message: { content: BetaContentBlock[] } }
+        allContentBlocks.push(...msg.message.content)
+        continue
+      }
+
+      if (event.type === 'stream_event') {
+        const streamEvt = event as {
+          event?: {
+            type: string
+            content_block?: { type: string; id?: string; tool_use_id?: string; content?: unknown; [key: string]: unknown }
+            delta?: { type: string; partial_json?: string; [key: string]: unknown }
+            [key: string]: unknown
+          }
+        }
+
+        if (streamEvt.event?.type === 'content_block_start') {
+          const contentBlock = streamEvt.event.content_block
+          if (contentBlock && contentBlock.type === 'server_tool_use') {
+            currentToolUseId = contentBlock.id as string
+            currentToolUseJson = ''
+            continue
+          }
+        }
+
+        if (currentToolUseId && streamEvt.event?.type === 'content_block_delta') {
+          const delta = streamEvt.event.delta
+          if (delta?.type === 'input_json_delta' && delta.partial_json) {
+            currentToolUseJson += delta.partial_json
+            try {
+              const queryMatch = currentToolUseJson.match(
+                /"query"\s*:\s*"((?:[^"\\]|\\.)*)"/,
+              )
+              if (queryMatch && queryMatch[1]) {
+                const parsedQuery = jsonParse('"' + queryMatch[1] + '"')
+                if (
+                  !toolUseQueries.has(currentToolUseId) ||
+                  toolUseQueries.get(currentToolUseId) !== parsedQuery
+                ) {
+                  toolUseQueries.set(currentToolUseId, parsedQuery)
+                  progressCounter++
+                  onProgress?.({
+                    type: 'query_update',
+                    query: parsedQuery,
+                  })
+                }
+              }
+            } catch {
+              // Ignore parsing errors for partial JSON
+            }
+          }
+        }
+
+        if (streamEvt.event?.type === 'content_block_start') {
+          const contentBlock = streamEvt.event.content_block
+          if (contentBlock && contentBlock.type === 'web_search_tool_result') {
+            const toolUseId = contentBlock.tool_use_id as string
+            const actualQuery = toolUseQueries.get(toolUseId) || query
+            const content = contentBlock.content
+            progressCounter++
+            onProgress?.({
+              type: 'search_results_received',
+              resultCount: Array.isArray(content) ? content.length : 0,
+              query: actualQuery,
+            })
+          }
+        }
+      }
+    }
+
+    // Extract SearchResult[] from content blocks
+    return extractSearchResults(allContentBlocks)
+  }
+}
+
+function extractSearchResults(
+  blocks: BetaContentBlock[],
+): SearchResult[] {
+  const results: SearchResult[] = []
+
+  for (const block of blocks) {
+    if (block.type === 'web_search_tool_result' && Array.isArray(block.content)) {
+      for (const r of block.content as Array<{ title: string; url: string; page_age?: string; type?: string }>) {
+        results.push({
+          title: r.title,
+          url: r.url,
+        })
+      }
+    }
+  }
+
+  return results
+}

src/tools/WebSearchTool/adapters/bingAdapter.ts

@@ -0,0 +1,204 @@
+/**
+ * Bing-based search adapter — fetches Bing search pages and extracts
+ * search results using regex pattern matching on raw HTML.
+ */
+
+import axios from 'axios'
+import he from 'he'
+import { AbortError } from '../../../utils/errors.js'
+import type { SearchResult, SearchOptions, WebSearchAdapter } from './types.js'
+
+const FETCH_TIMEOUT_MS = 30_000
+
+/**
+ * Browser-like headers to avoid Bing's anti-bot JS-rendered response.
+ * These mimic Microsoft Edge on macOS to get full HTML search results.
+ */
+const BROWSER_HEADERS = {
+  'User-Agent':
+    'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 Edg/131.0.0.0',
+  Accept:
+    'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8',
+  'Accept-Language': 'en-US,en;q=0.9',
+  'Accept-Encoding': 'gzip, deflate, br',
+  'Cache-Control': 'no-cache',
+  Pragma: 'no-cache',
+  'Sec-Ch-Ua': '"Microsoft Edge";v="131", "Chromium";v="131", "Not_A Brand";v="24"',
+  'Sec-Ch-Ua-Mobile': '?0',
+  'Sec-Ch-Ua-Platform': '"macOS"',
+  'Sec-Fetch-Dest': 'document',
+  'Sec-Fetch-Mode': 'navigate',
+  'Sec-Fetch-Site': 'none',
+  'Sec-Fetch-User': '?1',
+  'Upgrade-Insecure-Requests': '1',
+} as const
+
+export class BingSearchAdapter implements WebSearchAdapter {
+  async search(
+    query: string,
+    options: SearchOptions,
+  ): Promise<SearchResult[]> {
+    const { signal, onProgress, allowedDomains, blockedDomains } = options
+
+    if (signal?.aborted) {
+      throw new AbortError()
+    }
+
+    onProgress?.({ type: 'query_update', query })
+
+    const url = `https://www.bing.com/search?q=${encodeURIComponent(query)}&setmkt=en-US`
+
+    const abortController = new AbortController()
+    if (signal) {
+      signal.addEventListener('abort', () => abortController.abort(), { once: true })
+    }
+
+    let html: string
+    try {
+      const response = await axios.get(url, {
+        signal: abortController.signal,
+        timeout: FETCH_TIMEOUT_MS,
+        responseType: 'text',
+        headers: BROWSER_HEADERS,
+      })
+      html = response.data
+    } catch (e) {
+      if (axios.isCancel(e) || abortController.signal.aborted) {
+        throw new AbortError()
+      }
+      throw e
+    }
+
+    if (abortController.signal.aborted) {
+      throw new AbortError()
+    }
+
+    const rawResults = extractBingResults(html)
+
+    // Client-side domain filtering
+    const results = rawResults.filter((r) => {
+      if (!r.url) return false
+      try {
+        const hostname = new URL(r.url).hostname
+        if (allowedDomains?.length && !allowedDomains.some(d => hostname === d || hostname.endsWith('.' + d))) {
+          return false
+        }
+        if (blockedDomains?.length && blockedDomains.some(d => hostname === d || hostname.endsWith('.' + d))) {
+          return false
+        }
+      } catch {
+        return false
+      }
+      return true
+    })
+
+    onProgress?.({
+      type: 'search_results_received',
+      resultCount: results.length,
+      query,
+    })
+
+    return results
+  }
+}
+
+/**
+ * Extract organic search results from Bing HTML.
+ * Bing results live in <li class="b_algo"> blocks within <ol id="b_results">.
+ */
+export function extractBingResults(html: string): SearchResult[] {
+  const results: SearchResult[] = []
+
+  const algoBlockRegex = /<li\s+class="b_algo"[^>]*>([\s\S]*?)<\/li>/gi
+  let blockMatch: RegExpExecArray | null
+
+  while ((blockMatch = algoBlockRegex.exec(html)) !== null) {
+    const block = blockMatch[1]
+
+    // Extract the primary link from <h2><a href="...">...</a></h2>
+    const h2LinkRegex = /<h2[^>]*>\s*<a[^>]+href="([^"]+)"[^>]*>([\s\S]*?)<\/a>/i
+    const linkMatch = h2LinkRegex.exec(block)
+    if (!linkMatch) continue
+
+    const rawUrl = decodeHtmlEntities(linkMatch[1])
+    const titleHtml = linkMatch[2]
+
+    // Resolve Bing redirect URLs (bing.com/ck/a?...&u=a1aHR0cHM6Ly9...)
+    // or skip Bing-internal / relative links
+    const url = resolveBingUrl(rawUrl)
+    if (!url) continue
+
+    const title = decodeHtmlEntities(
+      titleHtml.replace(/<[^>]+>/g, '').trim(),
+    )
+
+    // Extract snippet: try b_lineclamp → b_caption <p> → b_caption fallback
+    const snippet = extractSnippet(block)
+
+    results.push({ title, url, snippet })
+  }
+
+  return results
+}
+
+function extractSnippet(block: string): string | undefined {
+  // 1. Try <p class="b_lineclamp...">
+  const lineclampRegex = /<p[^>]*class="b_lineclamp[^"]*"[^>]*>([\s\S]*?)<\/p>/i
+  let match = lineclampRegex.exec(block)
+  if (match) {
+    return decodeHtmlEntities(match[1].replace(/<[^>]+>/g, '').trim())
+  }
+
+  // 2. Try <p> inside b_caption
+  const captionPRegex = /<div[^>]*class="b_caption[^"]*"[^>]*>[\s\S]*?<p[^>]*>([\s\S]*?)<\/p>/i
+  match = captionPRegex.exec(block)
+  if (match) {
+    return decodeHtmlEntities(match[1].replace(/<[^>]+>/g, '').trim())
+  }
+
+  // 3. Fallback: any text inside b_caption <div>
+  const fallbackRegex = /<div[^>]*class="b_caption[^"]*"[^>]*>([\s\S]*?)<\/div>/i
+  const fallbackMatch = fallbackRegex.exec(block)
+  if (fallbackMatch) {
+    const text = fallbackMatch[1].replace(/<[^>]+>/g, '').trim()
+    if (text) return decodeHtmlEntities(text)
+  }
+
+  return undefined
+}
+
+export const decodeHtmlEntities = he.decode
+
+/**
+ * Resolve a Bing redirect URL to the actual target URL.
+ * Bing uses URLs like: https://www.bing.com/ck/a?...&u=a1aHR0cHM6Ly9leGFtcGxlLmNvbQ...
+ * The `u` query parameter is a base64-encoded URL prefixed with a1 (https) or a0 (http).
+ * Returns `undefined` for Bing-internal or relative links that should be skipped.
+ */
+export function resolveBingUrl(rawUrl: string): string | undefined {
+  // Skip relative / anchor links
+  if (rawUrl.startsWith('/') || rawUrl.startsWith('#')) return undefined
+
+  // Try to extract the `u` parameter from Bing redirect URLs
+  const uMatch = rawUrl.match(/[?&]u=([a-zA-Z0-9+/_=-]+)/)
+  if (uMatch) {
+    const encoded = uMatch[1]
+    if (encoded.length >= 3) {
+      const prefix = encoded.slice(0, 2)
+      const b64 = encoded.slice(2)
+      try {
+        // Base64url decode (pad as needed)
+        const padded = b64.replace(/-/g, '+').replace(/_/g, '/')
+        const decoded = Buffer.from(padded, 'base64').toString('utf-8')
+        if (decoded.startsWith('http')) return decoded
+      } catch {
+        // Fall through — not a valid base64 redirect
+      }
+    }
+  }
+
+  // Direct external URL (not a Bing-internal page)
+  if (!rawUrl.includes('bing.com')) return rawUrl
+
+  return undefined
+}

src/tools/WebSearchTool/adapters/index.ts

@@ -0,0 +1,41 @@
+/**
+ * Search adapter factory — selects the appropriate backend by checking
+ * whether the API base URL points to Anthropic's official endpoint.
+ */
+
+import { isFirstPartyAnthropicBaseUrl } from '../../../utils/model/providers.js'
+import { ApiSearchAdapter } from './apiAdapter.js'
+import { BingSearchAdapter } from './bingAdapter.js'
+import type { WebSearchAdapter } from './types.js'
+
+export type { SearchResult, SearchOptions, SearchProgress, WebSearchAdapter } from './types.js'
+
+let cachedAdapter: WebSearchAdapter | null = null
+
+export function createAdapter(): WebSearchAdapter {
+	// 直接用 bing 适配器，跳过 API 适配器的选择逻辑
+  return new BingSearchAdapter()
+//   // Adapter is stateless — safe to reuse across calls within a session
+//   if (cachedAdapter) return cachedAdapter
+
+//   // Env override: WEB_SEARCH_ADAPTER=api|bing forces specific backend
+//   const envAdapter = process.env.WEB_SEARCH_ADAPTER
+//   if (envAdapter === 'api') {
+//     cachedAdapter = new ApiSearchAdapter()
+//     return cachedAdapter
+//   }
+//   if (envAdapter === 'bing') {
+//     cachedAdapter = new BingSearchAdapter()
+//     return cachedAdapter
+//   }
+
+//   // Anthropic official URL → API server-side search
+//   if (isFirstPartyAnthropicBaseUrl()) {
+//     cachedAdapter = new ApiSearchAdapter()
+//     return cachedAdapter
+//   }
+
+//   // Third-party proxies / non-Anthropic endpoints → Bing fallback
+//   cachedAdapter = new BingSearchAdapter()
+//   return cachedAdapter
+}

src/tools/WebSearchTool/adapters/types.ts

@@ -0,0 +1,22 @@
+export interface SearchResult {
+  title: string
+  url: string
+  snippet?: string
+}
+
+export interface SearchOptions {
+  allowedDomains?: string[]
+  blockedDomains?: string[]
+  signal?: AbortSignal
+  onProgress?: (progress: SearchProgress) => void
+}
+
+export interface SearchProgress {
+  type: 'query_update' | 'search_results_received'
+  query?: string
+  resultCount?: number
+}
+
+export interface WebSearchAdapter {
+  search(query: string, options: SearchOptions): Promise<SearchResult[]>
+}