feat: 重构 WebSearch/WebFetch，新增 Tavily 适配器及 /web-tools 面板

- WebSearch: 默认 Tavily，适配器优先级 WEB_SEARCH_ADAPTER > settings.webSearchAdapter > tavily
- WebFetch: 支持 Tavily /extract 返回 Markdown，移除 domain blacklist 远程检查
- 新增 /web-tools 命令面板（Search/Fetch 双 Tab + 二级配置菜单）
- 新增 settings 字段: webSearchAdapter, webFetchAdapter, tavilyEndpointUrl, braveApiKey, exaApiKey, exaEndpointUrl, webFetchHttpTimeoutMs
- 适配器联动: Tavily/Exa 从 settings 读取 endpoint 和 API key

Co-Authored-By: deepseek-v4-pro <deepseek-ai@claude-code-best.win>

packages/builtin-tools/src/tools/WebSearchTool/adapters/exaAdapter.ts

@@ -10,9 +10,10 @@
 
 import axios from 'axios'
 import { AbortError } from 'src/utils/errors.js'
+import { getSettings_DEPRECATED } from 'src/utils/settings/settings.js'
 import type { SearchResult, SearchOptions, WebSearchAdapter } from './types.js'
 
-const EXA_MCP_URL = 'https://mcp.exa.ai/mcp'
+const DEFAULT_EXA_MCP_URL = 'https://mcp.exa.ai/mcp'
 const FETCH_TIMEOUT_MS = 25_000
 
 export class ExaSearchAdapter implements WebSearchAdapter {
@@ -38,10 +39,24 @@ export class ExaSearchAdapter implements WebSearchAdapter {
     const searchType = options.searchType ?? 'auto'
     const contextMaxCharacters = options.contextMaxCharacters ?? 10000
 
+    // Read settings for custom endpoint / API key
+    const settings = getSettings_DEPRECATED() as Record<string, unknown> & {
+      exaEndpointUrl?: string
+      exaApiKey?: string
+    }
+    const exaUrl = settings.exaEndpointUrl || DEFAULT_EXA_MCP_URL
+    const headers: Record<string, string> = {
+      'Content-Type': 'application/json',
+      Accept: 'application/json, text/event-stream',
+    }
+    if (settings.exaApiKey) {
+      headers['Authorization'] = `Bearer ${settings.exaApiKey}`
+    }
+
     let responseText: string
     try {
       const response = await axios.post(
-        EXA_MCP_URL,
+        exaUrl,
         {
           jsonrpc: '2.0',
           id: 1,
@@ -60,10 +75,7 @@ export class ExaSearchAdapter implements WebSearchAdapter {
         {
           signal: abortController.signal,
           timeout: FETCH_TIMEOUT_MS,
-          headers: {
-            'Content-Type': 'application/json',
-            Accept: 'application/json, text/event-stream',
-          },
+          headers,
           responseType: 'text',
         },
       )

packages/builtin-tools/src/tools/WebSearchTool/adapters/index.ts

@@ -1,13 +1,18 @@
 /**
- * Search adapter factory — selects the appropriate backend by checking
- * whether the API base URL points to Anthropic's official endpoint.
+ * Search adapter factory — selects the appropriate backend.
+ *
+ * Priority (highest first):
+ *   1. WEB_SEARCH_ADAPTER environment variable (explicit override)
+ *   2. settings.webSearchAdapter (user-configurable via /web-tools)
+ *   3. Default: tavily
  */
 
-import { isFirstPartyAnthropicBaseUrl } from 'src/utils/model/providers.js'
+import { getSettings_DEPRECATED } from 'src/utils/settings/settings.js'
 import { ApiSearchAdapter } from './apiAdapter.js'
 import { BingSearchAdapter } from './bingAdapter.js'
 import { BraveSearchAdapter } from './braveAdapter.js'
 import { ExaSearchAdapter } from './exaAdapter.js'
+import { TavilySearchAdapter } from './tavilyAdapter.js'
 import type { WebSearchAdapter } from './types.js'
 
 export type {
@@ -17,60 +22,53 @@ export type {
   WebSearchAdapter,
 } from './types.js'
 
-/**
- * Check if the current session uses a third-party (non-Anthropic) API provider.
- * These providers don't support Anthropic's server_tools (server-side web search),
- * so they must fall back to the Bing scraper adapter.
- */
-function isThirdPartyProvider(): boolean {
-  return !!(
-    process.env.CLAUDE_CODE_USE_OPENAI ||
-    process.env.CLAUDE_CODE_USE_GEMINI ||
-    process.env.CLAUDE_CODE_USE_GROK
-  )
-}
+export type SearchAdapterKey = 'api' | 'bing' | 'brave' | 'exa' | 'tavily'
 
 let cachedAdapter: WebSearchAdapter | null = null
-let cachedAdapterKey: 'api' | 'bing' | 'brave' | 'exa' | null = null
+let cachedAdapterKey: SearchAdapterKey | null = null
 
 export function createAdapter(): WebSearchAdapter {
+  // 1. Explicit env override
   const envAdapter = process.env.WEB_SEARCH_ADAPTER
-  // Priority:
-  //   1. Explicit env override (WEB_SEARCH_ADAPTER=api|bing|brave)
-  //   2. Third-party provider (OpenAI/Gemini/Grok) → bing (no server_tools support)
-  //   3. First-party Anthropic API → api (server-side web search + connector_text)
-  //   4. Fallback → bing
-  const adapterKey =
+  // 2. Settings preference (set via /web-tools panel)
+  const settingsAdapter = getSettings_DEPRECATED().webSearchAdapter
+
+  const adapterKey: SearchAdapterKey =
     envAdapter === 'api' ||
     envAdapter === 'bing' ||
     envAdapter === 'brave' ||
-    envAdapter === 'exa'
+    envAdapter === 'exa' ||
+    envAdapter === 'tavily'
       ? envAdapter
-      : isThirdPartyProvider()
-        ? 'bing'
-        : isFirstPartyAnthropicBaseUrl()
-          ? 'api'
-          : 'exa'
+      : settingsAdapter === 'api' ||
+          settingsAdapter === 'bing' ||
+          settingsAdapter === 'brave' ||
+          settingsAdapter === 'exa' ||
+          settingsAdapter === 'tavily'
+        ? settingsAdapter
+        : 'tavily' // 3. Default
 
   if (cachedAdapter && cachedAdapterKey === adapterKey) return cachedAdapter
 
-  if (adapterKey === 'api') {
-    cachedAdapter = new ApiSearchAdapter()
-    cachedAdapterKey = 'api'
-    return cachedAdapter
-  }
-  if (adapterKey === 'brave') {
-    cachedAdapter = new BraveSearchAdapter()
-    cachedAdapterKey = 'brave'
-    return cachedAdapter
-  }
-  if (adapterKey === 'exa') {
-    cachedAdapter = new ExaSearchAdapter()
-    cachedAdapterKey = 'exa'
-    return cachedAdapter
+  switch (adapterKey) {
+    case 'api':
+      cachedAdapter = new ApiSearchAdapter()
+      break
+    case 'bing':
+      cachedAdapter = new BingSearchAdapter()
+      break
+    case 'brave':
+      cachedAdapter = new BraveSearchAdapter()
+      break
+    case 'exa':
+      cachedAdapter = new ExaSearchAdapter()
+      break
+    case 'tavily':
+    default:
+      cachedAdapter = new TavilySearchAdapter()
+      break
   }
 
-  cachedAdapter = new BingSearchAdapter()
-  cachedAdapterKey = 'bing'
+  cachedAdapterKey = adapterKey
   return cachedAdapter
 }

packages/builtin-tools/src/tools/WebSearchTool/adapters/tavilyAdapter.ts

@@ -0,0 +1,94 @@
+/**
+ * Tavily-based search adapter — calls the Tavily Search API
+ * (https://tavily.claude-code-best.win) and maps results to
+ * the unified SearchResult format.
+ */
+
+import axios from 'axios'
+import { AbortError } from 'src/utils/errors.js'
+import { getSettings_DEPRECATED } from 'src/utils/settings/settings.js'
+import type { SearchResult, SearchOptions, WebSearchAdapter } from './types.js'
+
+const DEFAULT_TAVILY_SEARCH_URL = 'https://tavily.claude-code-best.win/search'
+const FETCH_TIMEOUT_MS = 30_000
+
+interface TavilySearchHit {
+  title: string
+  url: string
+  content: string
+  score: number
+}
+
+interface TavilySearchResponse {
+  results: TavilySearchHit[]
+}
+
+export class TavilySearchAdapter 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 abortController = new AbortController()
+    if (signal) {
+      signal.addEventListener('abort', () => abortController.abort(), {
+        once: true,
+      })
+    }
+
+    const settings = getSettings_DEPRECATED() as Record<string, unknown> & {
+      tavilyEndpointUrl?: string
+    }
+    const searchUrl = settings.tavilyEndpointUrl || DEFAULT_TAVILY_SEARCH_URL
+
+    try {
+      const response = await axios.post<{
+        query: string
+        results: TavilySearchHit[]
+      }>(
+        searchUrl,
+        {
+          query,
+          search_depth: 'basic',
+          max_results: options.numResults ?? 8,
+          include_domains: allowedDomains ?? [],
+          exclude_domains: blockedDomains ?? [],
+        },
+        {
+          signal: abortController.signal,
+          timeout: FETCH_TIMEOUT_MS,
+          headers: { 'Content-Type': 'application/json' },
+        },
+      )
+
+      if (abortController.signal.aborted) {
+        throw new AbortError()
+      }
+
+      const results: SearchResult[] = (response.data.results ?? []).map(
+        (hit: TavilySearchHit) => ({
+          title: hit.title,
+          url: hit.url,
+          snippet: hit.content,
+        }),
+      )
+
+      onProgress?.({
+        type: 'search_results_received',
+        resultCount: results.length,
+        query,
+      })
+
+      return results
+    } catch (e) {
+      if (axios.isCancel(e) || abortController.signal.aborted) {
+        throw new AbortError()
+      }
+      throw e
+    }
+  }
+}