dsh-websearch

Aggregated web search provider for DeepSeek Harness — one plugin id unified that fans out to eleven backends concurrently, merges + URL-dedups results, and stays usable even when some backends go down.

A pure-Cordis drop-in: registers ONE provider at ctx.web so the dsh-web selection rule never fires WEB_PROVIDER_AMBIGUOUS. Zero-config search out of the box (Exa + Parallel + DuckDuckGo + SearXNG are keyless); API-key backends (DeepSeek / Anthropic / OpenAI / Brave / Tavily / Serper / Mojeek) auto-activate once their key is supplied via the credentials service or env.

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DSH（DeepSeek Harness）原生插件：向 ctx.web 注册唯一的聚合搜索 provider unified，内置十一后端并发 fan-out，合并 + URL 去重后返回——即使部分后端宕机仍可用。

纯 Cordis 直插：只注册一个 provider，所以 dsh-web 的选择规则永远不会触发 WEB_PROVIDER_AMBIGUOUS。零配置即可搜索——Exa + Parallel + DuckDuckGo + SearXNG 四者皆无 key、开箱即用；DeepSeek / Anthropic / OpenAI / Brave / Tavily / Serper / Mojeek 在提供 API key 后自动激活。

Backends | 后端

id	key	endpoint	how it returns	notes
exa	none	https://mcp.exa.ai/mcp	streamable-http MCP, tool web_search_exa { query, numResults }, text blocks "Title:/URL:/Published:/Highlights:"	opencode 同源,无 key
parallel	none	https://search.parallel.ai/mcp	streamable-http MCP, tool web_search { objective, search_queries[], session_id?, model_name? } returns JSON-string { search_id, results: [{ url, title, publish_date, excerpts[] }] }	opencode 同源,无 key
ddg	none	https://html.duckduckgo.com/html/	HTML scrape, decode uddg= redirect param for real URL + result__snippet	兜底,零依赖
searxng	none/optional	https://searx.be/search (default)	REST JSON /search?q=, public instances unlimited	元搜索,隐私友好
brave	BRAVE_API_KEY	https://api.search.brave.com/res/v1/web/search	REST JSON, independent index, 2000/mo free	高质量,无 Google 偏见
tavily	TAVILY_API_KEY	https://api.tavily.com/search	REST JSON, AI-focused, answer + results[], deep search	AI 专用,含答案摘要
serper	SERPER_API_KEY	https://google.serper.dev/search	REST JSON, scrapes Google organic[], 2500/mo free	极速,结构化
mojeek	MOJEEK_API_KEY	https://api.mojeek.com/v1/search	REST JSON, independent index, 1000/day free	无追踪,英文为主
deepseek	DEEPSEEK_API_KEY	https://api.deepseek.com/anthropic/v1/messages	Anthropic Messages API + native web_search_20250305 server tool, model deepseek-v4-flash	与 dav web-search-deepseek 同机制
anthropic	ANTHROPIC_API_KEY	https://api.anthropic.com/v1/messages	Anthropic Messages + web_search_20250305, model claude-sonnet-4-6	Claude Code 同机制
openai	OPENAI_API_KEY	https://api.openai.com/v1/responses	Responses API native web_search tool, parse url_citation annotations	Codex 同机制

Default enabled set: ["exa", "parallel", "ddg", "searxng"] — all keyless. The key-gated backends only join when their available() returns true (key present + baseURL reachable).

Install | 安装

方式一：作为 profile 依赖安装（推荐，规范做法）

cd ~/.dsh/profiles/web
# 在 package.json 的 dependencies 里加入：
#   "dsh-websearch": "file:/path/to/dsh-websearch"
pnpm install

插件自带 dsh.bundle 元数据（package.json 声明 "dsh": {"bundle": {"patch": "./cordis.patch.yml"}}），把它加入 profile package.json 的 dsh.profile.bundles 列表后即自动注册，无需在 cordis.patch.yml 手写条目。

只需在 ~/.dsh/profiles/web/cordis.patch.yml 里把内置 web_search 工具指到 unified provider：

- id: web
  name: '@deepseek-ai/dsh-web'
  config:
    searchProvider: unified
- id: web-search-deepseek
  name: '@deepseek-ai/dsh-web-search-deepseek'
  disabled: true

重启 dsh web 即生效。

Settings | 配置

插件向 DSH 设置面板注册 unified-search namespace（Settings → Unified Search），全部字段扁平化、开箱可编辑：

全局

字段	默认	说明
numResults	8	每次搜索返回结果数（1-50）
concurrency	6	并发后端数（1-10）
backendTimeoutMs	30000	单后端超时毫秒

11 个后端开关：enableExa / enableParallel / enableDdg / enableSearxng（默认开）；enableBrave / enableTavily / enableSerper / enableMojeek / enableDeepseek / enableAnthropic / enableOpenai（默认关）

API Key 授权（credential-ref，填环境变量名，实际 key 存于 credentials 服务或环境变量）：

字段	默认引用
braveApiKeyEnv	BRAVE_API_KEY
tavilyApiKeyEnv	TAVILY_API_KEY
serperApiKeyEnv	SERPER_API_KEY
mojeekApiKeyEnv	MOJEEK_API_KEY
deepseekApiKeyEnv	DEEPSEEK_API_KEY
anthropicApiKeyEnv	ANTHROPIC_API_KEY
openaiApiKeyEnv	OPENAI_API_KEY
searxngApiKeyEnv	SEARXNG_API_KEY（私有实例可选）

Base URL / Model：每个 key-gated 后端都有对应 ${id}BaseURL；DeepSeek/Anthropic/OpenAI 另有 ${id}Model；Tavily 有 tavilySearchDepth（basic/advanced）。

环境变量兜底：未在 credentials 配置时回退读同名环境变量；DSH_UNIFIED_SEARCH_BACKENDS 可逗号分隔强制指定启用集合。

Design | 设计

• One provider, no ambiguity: a single registeredSearchProvider({id:"unified"}) — the dsh-web seam's selection rule picks it unambiguously, and search() caps maxResults itself.
• Promise.allSettled fan-out: every enabled + available backend fires concurrently; a single backend failure is demoted to a soft null so the rest still contribute — only when ALL fail does the provider throw WEB_PROVIDER_ERROR.
• Per-backend abort demotion: a single backend aborting becomes soft-null; the provider only rethrows WEB_ABORTED when the caller's own AbortSignal fires.
• URL dedup + merge: results across backends are merged and deduped by case-insensitive URL; missing title/snippet/publishedAt from one backend get filled in from another (e.g. Exa's title + Parallel's excerpt).
• Concurrency & Timeout Control: concurrency (default 6) limits simultaneous calls; backendTimeoutMs (default 30s) caps each backend.
• Streamable-http MCP, custom handshake: lib/util/mcp-client.js implements initialize → notifications/initialized → tools/call with Mcp-Session-Id header caching against Exa and Parallel — no dependency on the full MCP SDK.
• hooks.recordRequest/recordOutcome bridge: each backend routes its request/outcome to lib/util/log.js which records web/unified-search-backend-request / …backend-outcome events onto the active DSH session via ctx.get("agents")?.currentInitiator()?.session.append(...) (mirrors dsh-web-search-deepseek).

Architecture | 架构

lib/
  index.js                 # name/inject/Config/apply — registers settings + provider
  provider.js              # UnifiedSearchProvider — fan-out, abort demotion, dedup, truncate, concurrency, timeout
  util/
    abort.js               # isAbortError / searchAborted / throwIfSearchAborted / maybeAbortError
    mcp-client.js          # streamable-http MCP client (initialize + tools/call + session cache)
    log.js                 # recordBackendRequest / recordBackendOutcome → session event log
  backends/
    exa.js                 # Exa (web_search_exa) via mcp-client
    parallel.js            # Parallel (web_search) via mcp-client
    ddg.js                 # DuckDuckGo HTML scrape (uddg redirect decode)
    searxng.js             # SearXNG REST JSON (keyless)
    brave.js               # Brave Search REST (key-gated)
    tavily.js              # Tavily REST (key-gated, AI answer + deep search)
    serper.js              # Serper.dev REST (key-gated, Google scrape)
    mojeek.js              # Mojeek REST (key-gated)
    anthropic-like.js      # shared: DeepSeek + Anthropic (Messages API + web_search_* server tool)
    openai.js              # OpenAI /responses + web_search tool (url_citation parsing)
    index.js               # unified registry + individual exports
tests/
  parse.test.js            # 28 unit tests for each backend's pure parse fn
  provider.test.js         # 5 fan-out tests (merge/dedup, abort demotion, all-fail, maxResults cap, concurrency)

Test | 测试

node --test tests/parse.test.js tests/provider.test.js

33/33 pass.

License | 许可

MIT © 2026 240xu