我为 AI Agent 做了一个更好的网页搜索 MCP——无需 API Key

BetterWebSearch MCP — smarter web search, better data extraction, flexible and extensible, open source Web search for AI agents sounds simple: Search the web Open the results Extract useful information Feed it back to the model In reality, it gets messy pretty quickly. Some websites work with a simple HTTP request. Others render almost everything through JavaScript. Search APIs often require accounts, API keys or paid plans, and dumping entire webpages into an LLM context wastes a huge amount of tokens. That's why I built BetterWebSearch MCP. 👉 https://www.npmjs.com/package/better-web-search-mcp 👉 https://github.com/PhantomPixelDev/BetterWebSearch-MCP It's a local, open-source Model Context Protocol server for web search, extraction and deep research. And the default setup requires no API key, no account and no cloud service. Zero-config web search BetterWebSearch uses DuckDuckGo by default, so you can get started immediately. Optional providers are also supported: DuckDuckGo — keyless Brave Search — optional Tavily — optional The easiest way to run it is: npx -y better-web-search-mcp Enter fullscreen mode Exit fullscreen mode Or add it directly to your MCP configuration: { "mcpServers": { "better-web-search-mcp": { "command": "npx", "args": ["-y", "better-web-search-mcp"] } } } Enter fullscreen mode Exit fullscreen mode That's it. No .env file is required for the default setup. The bigger problem isn't search — it's extraction Getting ten URLs isn't particularly useful if your agent can't actually read them. Modern websites can require very different extraction strategies. BetterWebSearch uses a three-tier extraction pipeline: Tier 1: Fast HTTP fetch ↓ Tier 2: Structured / hydration data JSON-LD, __NEXT_DATA__, __NUXT__ ↓ Tier 3: Playwright browser full rendering + API interception Enter fullscreen mode Exit fullscreen mode The important part is that it only escalates when necessary. If normal HTTP extraction works, there's no reason to launch Chromium. If the page is JavaScript-heavy, BetterWebSearch can progressively fall back to structured application data and finally Playwright. This keeps simple pages fast while still supporting modern web apps. Built for research, not just search results The MCP server currently exposes tools including: Tool Purpose web_search Search across providers, deduplicate and rerank results web_research Search, extract and return cited research passages deep_search Alias for web_research web_extract Extract clean content from a URL web_find Search inside a specific website web_news Search recent news with diversity filtering The tool I find especially useful is web_research. Instead of making the agent manually do: web_search ↓ web_extract result 1 ↓ web_extract result 2 ↓ web_extract result 3 ↓ web_extract result 4 ↓ web_extract result 5 Enter fullscreen mode Exit fullscreen mode it can perform the search, extraction and passage selection inside the MCP server and return a much smaller research payload. It can dramatically reduce agent context usage This was one of the main things I wanted to improve. I ran a benchmark comparing two workflows. Traditional workflow The agent: performs a search opens the top five pages receives their extracted contents BetterWebSearch research workflow The agent makes one web_research call and receives selected passages with citations. Across 12 live-web research questions, the results were: Traditional web_research Payload 820,229 chars 110,973 chars Estimated tokens ~205,000 ~28,000 Wall clock 137.3s 49.6s That's an 86.5% reduction in returned text overall. The median per-question reduction was 83.8%. Of course, returning less text isn't useful if the important answer disappears. So I added a second benchmark for answer retention. Across 34 questions with known factual markers: Numbers 8 / 8 HTTP status codes 6 / 6 Acronym expansions 12 / 12 Facts 7 / 8 Overall: 33 / 34 Retention: 97.1% Enter fullscreen mode Exit fullscreen mode The benchmark source is included in the repository, so you can reproduce it yourself: npm run build npm run bench Enter fullscreen mode Exit fullscreen mode Query expansion Another useful feature is automatic query expansion. Instead of searching only the exact sentence given by the model, BetterWebSearch can rewrite it into several related searches. For example: Unlimited mobile internet Germany Enter fullscreen mode Exit fullscreen mode might also produce queries around: unbegrenztes Datenvolumen Deutschland unlimited data SIM Germany German unlimited mobile plans Enter fullscreen mode Exit fullscreen mode Those queries can run in parallel before the results are deduplicated and reranked. This helps especially with searches where terminology differs between websites or languages. Source independence Search result count can also be misleading. If the same wire story is republished by five websites, that isn't really five independent sources. BetterWebSearch clusters similar content before citation so duplicated stories are less likely to be treated as separate evidence. Self-learning extraction Different domains require different extraction techniques. BetterWebSearch remembers which extraction strategy worked for a domain. So if the first visit discovers that a site only works properly through a particular structured-data path or browser fallback, later requests can skip unnecessary stages. Security matters too Web content is untrusted input, especially when it's being consumed automatically by AI agents. BetterWebSearch includes several protections. SSRF protection URLs are validated and requests to things like: localhost private IP ranges link-local addresses reserved addresses Enter fullscreen mode Exit fullscreen mode are rejected. Redirects are checked again at every hop. Prompt-injection detection Extracted content is treated as untrusted. web_extract can flag text that appears to contain instructions attempting to manipulate an agent. The original content isn't rewritten, but the result carries security information so the calling model can treat it appropriately. It runs locally Another design goal was avoiding unnecessary infrastructure. BetterWebSearch runs locally over MCP stdio. There is: no BetterWebSearch cloud no proxy server no telemetry no analytics service no mandatory account Your queries go to the search provider and target websites, not through another hosted intermediary. Works with most MCP clients It should work with any MCP client supporting stdio, including: Claude Desktop Claude Code Cursor VS Code Copilot Windsurf Cline Zed OpenCode I personally built it primarily around coding-agent and AI research workflows, but there's nothing client-specific about the server. Try it The fastest way: npx -y better-web-search-mcp Enter fullscreen mode Exit fullscreen mode NPM: https://www.npmjs.com/package/better-web-search-mcp GitHub: https://github.com/PhantomPixelDev/BetterWebSearch-MCP Documentation: https://phantompixeldev.github.io/BetterWebSearch-MCP/ It's MIT licensed, so feel free to use it, fork it or contribute. If you're using MCP agents heavily, I'd especially be interested in hearing about: websites where extraction fails unusual JavaScript-heavy sites search-quality issues agent workflows that consume too much context providers you'd like to see supported Issues and PRs are welcome. TL;DR BetterWebSearch MCP gives AI agents: 🔍 Keyless web search with DuckDuckGo 🧠 Deep research with citations ⚡ HTTP-first extraction 💧 Structured-data extraction 🎭 Playwright fallback when required 📉 Up to ~86% smaller research payloads in my benchmark 🔐 SSRF and prompt-injection protections 🔌 Support for popular MCP clients 🏠 Local execution 💸 No mandatory paid API 🛠️ Open source / MIT npx -y better-web-search-mcp Enter fullscreen mode Exit fullscreen mode