Desvela ARD Registry — free preflight(domain) MCP Server

by desvela Your server? Claim it

answering

Desvela ARD Registry — free preflight(domain) is answering right now. Last checked 14 min ago. It exposes 4 tools.

What a domain publishes for AI agents: ai-catalog.json, llms.txt, agents.md, robots.txt rules. Free.

Uptime history 91 days of history

91 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

158 ms

Response time

average over 24h

open, no key

Access

streamable-http

What changed 5

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 19 August 2026. No other catalogue keeps this.

25 Oct a tool description was rewritten crawler_block_test

29 Sep a tool description was rewritten preflight

18 Sep a tool description was rewritten search

28 Aug a tool appeared crawler_block_test

19 Aug a tool appeared search

Nothing serious here today

Today is the operative word: we check Desvela ARD Registry — free preflight(domain) every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 14 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add registry --transport http https://registry.desvela.dev/mcp

Settings → Connectors → Add custom connector, then paste this address

https://registry.desvela.dev/mcp

~/.codex/config.toml

[mcp_servers.registry]
url = "https://registry.desvela.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "registry": {
      "url": "https://registry.desvela.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "registry": {
      "type": "http",
      "url": "https://registry.desvela.dev/mcp"
    }
  }
}

Available tools 4

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

crawler

crawler_block_test

What the domain's CDN really does, as opposed to what its robots.txt says. Sends each AI crawler's real user-agent at the homepage and compares the response against a browser: a site can allow GPTBot in robots.txt and still have its CDN answer it a 403, and robots.txt cannot tell you that. Verdicts per crawler: ok, blocked (refused, or redirected off the site while the browser got the page), throttled (429, which is "too fast" and not "not you"), degraded (a 200 with a fraction of the bytes, the shape of a JS-gated page), or error. When `measurable` is false there is no verdict to give: the site refused or redirected away the control request too, or it opted out of our crawling (`optedOut`, no requests sent). Live probe, ~6 requests. Free. Use preflight for the declared policy; use this for the observed one.

preflight

preflight

What a domain publishes for AI agents before you touch it: ai-catalog.json (ARD), llms.txt, agents.md, and its robots.txt directives for AI bots (GPTBot, ClaudeBot, Google-Extended…). Includes a visibility receipt: surface-by-surface state, the words that would find the domain in search (or the honest fact that none would), what is missing and where to publish it. Served from the Desvela ARD index when fresh (<7 days), live-checked otherwise. Free.

search

Natural-language search over what Desvela has indexed: agents, MCP servers, registries — the same index as POST /search. Returns catalog entries per the ARD spec. When nothing matches, returns referrals (other ARD-conformant registries you can query the same way) and listing (how a domain gets into this index: publish ai-catalog.json, then preflight it), instead of an empty answer.

watch

watch

Subscribe to a domain: get a signed webhook (X-Desvela-Signature, HMAC-SHA256) when what it publishes for AI agents changes — ai-catalog.json entries added/changed/gone, llms.txt or agents.md edited or removed, robots.txt AI-bot directives changed. Checked weekly against the Desvela ARD index. Returns a manage_token (GET/DELETE https://registry.desvela.dev/watch/{id}) and the signing secret — store both.

Endpoints

URL	Transport	State	Latency	Checked
https://registry.desvela.dev/mcp	streamable-http	answering	123 ms	14 min ago

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Desvela ARD Registry — free preflight(domain) — questions

Answers built from our own checks of this server.

What can Desvela ARD Registry — free preflight(domain) do?

It exposes 4 tools, read directly from the server on our last check. Among them: crawler_block_test, preflight, search, watch. 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 →

Is Desvela ARD Registry — free preflight(domain) working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 158 ms. The bar chart above shows every period we have measured.

How do I connect Desvela ARD Registry — free preflight(domain)?

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 Desvela ARD Registry — free preflight(domain) need an API key?

No. Desvela ARD Registry — free preflight(domain) completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Desvela ARD Registry — free preflight(domain)?

It answers our handshake in 158 ms on average, which is faster than 81% 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.