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Rat Radar MCP Server

by ratlabs Your server? Claim it
answering

Rat Radar is answering right now. Last checked moments ago. It exposes 8 tools.

Ask before you scrape: is a site open, may I fetch this URL, and how do I extract a page. No key.

Uptime history 6 days of history
6 days agonow
100.0%
Uptime 24h
92 of 92 checks
8
Tools
read from the server
111 ms
Response time
average over 24h
open, no key
Access
streamable-http

What changed 1

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 1 November 2026. No other catalogue keeps this.

1 Nov a tool description was rewritten check_site

Nothing serious here today

Today is the operative word: we check Rat Radar every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 0 min ago.

run in your terminal
claude mcp add rat-radar --transport http https://rat-radar.github-a18.workers.dev/mcp
Settings → Connectors → Add custom connector, then paste this address
https://rat-radar.github-a18.workers.dev/mcp
~/.codex/config.toml
[mcp_servers.rat-radar]
url = "https://rat-radar.github-a18.workers.dev/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "rat-radar": {
      "url": "https://rat-radar.github-a18.workers.dev/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "rat-radar": {
      "type": "http",
      "url": "https://rat-radar.github-a18.workers.dev/mcp"
    }
  }
}

Available tools 8

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

sites
list_sites
List the sites in the dataset, optionally by category or verdict. Use it to find easy targets or to see what is covered.
search_sites
Find sites in the dataset by a word: a name, host, category (jobs, shop, news, gov), country or verdict. Use it to discover what is covered before calling check_site.
xray
xray_diagram
Draw a page's anatomy as an Excalidraw diagram: its regions, the ranked ways to get its data, proof rows, the best route and what the page is made of. Returns a download link for the .excalidraw file (give it to the user; it opens at excalidraw.com or in Obsidian) and a file_name. With include_scene, also the scene itself (a few hundred KB).
xray_page
How do I extract the data from THIS page? Fetches one public page and returns a ranked extraction plan: embedded JSON, JSON-LD, repeated records with CSS selectors and field names, tables, feeds, hidden API calls. Each source has a reliability, proof rows pulled from the real page, and the plan notes pagination and blockers. Set include_code for a starter Python script. Works on the raw HTML only, so JavaScript-built pages report a blocker instead of data. Use check_site first to learn whether the site allows scraping at all.
can
can_fetch
Does robots.txt allow fetching this exact URL? Fetches the live robots.txt and applies the longest-match rule for a user agent (default: * plus GPTBot, ClaudeBot, Google-Extended, CCBot, PerplexityBot). Returns allowed or not, the rule that decided it, and any crawl delay. A courtesy check, not a legal opinion.
playbook
get_playbook
What should I build with this site, and how? Give a domain and, optionally, a goal in plain words (for example "price alerts", "sales leads", "new jobs", "change log", "knowledge base"). Returns the best-matching workflow for that site: what it does, its cadence, a trigger, collect, shape, store, act pipeline, the fields to keep, and step-by-step build recipes for n8n, Make, Zapier and Apify (or just one with platform). Workflows marked found_on_this_site come from what the weekly probe saw on the site itself. Also returns the other workflows, the golden data, and the guardrails.
site
check_site
Can I scrape this site, and how? Returns a verdict (open, guarded, hostile, blocked), a hostility score, a recommended approach with steps and risks, bot protections, robots.txt and AI-crawler policy, machine-readable surfaces (sitemap, llms.txt, JSON-LD), and eu_ai_training: the signals the EDPB draft Guidelines 03/2026 on web scraping for generative AI count against collecting personal data (robots.txt blocks on AI training crawlers, a Content-Signal of ai-train=no, ai.txt, CAPTCHAs, login walls), as none, some or strong. Signals, not legal advice. Uses a weekly-probed dataset of several hundred sites; for any other domain it probes live from a datacenter IP.
summary
summary
Headline numbers across the dataset: verdict mix, how many sites block AI crawlers (and which), protection vendors, by category and country.

Endpoints

URLTransportStateLatencyChecked
https://rat-radar.github-a18.workers.dev/mcp streamable-http answering 55 ms 0 min ago

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Rat Radar — questions

Answers built from our own checks of this server.

What can Rat Radar do?
It exposes 8 tools, read directly from the server on our last check. Among them: can_fetch, check_site, get_playbook, list_sites, search_sites, summary and 2 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
What is Rat Radar mostly used for?
Its tools cluster around xray and sites. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.
Is Rat Radar working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 111 ms. The bar chart above shows every period we have measured.
How do I connect Rat Radar?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Rat Radar need an API key?
No. Rat Radar completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 8 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Rat Radar?
It answers our handshake in 111 ms on average, which is faster than 90% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.