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.
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
