Desvela ARD Registry — free preflight(domain)

dev.desvela/registryVersion 0.1.0

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

Status

Responds79 msNov 14, 2026, 14:26 UTCAnswered our handshake without sign-in.

Registry data may be out of date

We could not refresh it, so this page shows the last copy.

Last checked: Nov 14, 2026, 14:26 UTC
Latency: 79 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: EU hosting detected (detected, not a legal statement)
Registry data as of: Nov 14, 2026, 21:12 UTC

Data from the official MCP Registry, checked by run.zero. How we check

Connect

Streamable HTTP

https://registry.desvela.dev/mcpResponds79 msNov 14, 2026, 14:26 UTC

No sign-in

Claude Code

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

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: registry
Remote MCP server URL: https://registry.desvela.dev/mcp

Cursor

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

VS Code

code --add-mcp '{"name":"registry","type":"http","url":"https://registry.desvela.dev/mcp"}'

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Tools

4 tools

Tools of Desvela ARD Registry — free preflight(domain)
	Description		Read-only	Idempotent	Open world
`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.	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.	Not declared	Not declared	Not declared	Not declared
`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.	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.	Not declared	Not declared	Not declared	Not declared
`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.	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.	Not declared	Not declared	Not declared	Not declared
`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.	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.	Not declared	Not declared	Not declared	Not declared

Details

Registry status: Active
Published: Jul 20, 2026
Updated: Jul 20, 2026
Website: https://desvela.ai/census/⁠ (opens in a new tab)
Repository: Not given
Categories (suggested): AI models Search and webSuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared

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