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Cloakcheck MCP Server

not responding

Cloakcheck is listed as active in the registry but did not answer our last check. It exposes 1 tools.

Scan a page for content planted to hijack an AI browsing/shopping agent before it acts on the page.

Uptime history 50 days of history · worst day 0%
50 days agonow
0.0%
Uptime 24h
0 of 91 checks
1
Tools
read from the server
46 ms
Response time
average over 24h
open, no key
Access
streamable-http

Cloakcheck does not always answer

Over the last week it answered 0.0% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

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 6 min ago.

run in your terminal
claude mcp add cloakcheck --transport http https://www.edgethirteen.com/api/mcp/cloakcheck
Settings → Connectors → Add custom connector, then paste this address
https://www.edgethirteen.com/api/mcp/cloakcheck
~/.codex/config.toml
[mcp_servers.cloakcheck]
url = "https://www.edgethirteen.com/api/mcp/cloakcheck"
.cursor/mcp.json
{
  "mcpServers": {
    "cloakcheck": {
      "url": "https://www.edgethirteen.com/api/mcp/cloakcheck"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "cloakcheck": {
      "type": "http",
      "url": "https://www.edgethirteen.com/api/mcp/cloakcheck"
    }
  }
}

Available tools 1

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

page
check_page_for_agent_hijacking
Fetch a URL and scan it for content planted to hijack an AI agent visiting it rather than to inform a human: invisible unicode (zero-width joiners, steganographic tag-block characters), CSS-hidden text (display:none, opacity:0, off-screen) paired with instruction-shaped language ('ignore previous instructions', 'add to cart and checkout', fake system-role text), and instruction-shaped phrases in alt/title/aria-label attributes or meta tags. Call this before an autonomous browsing or checkout flow acts on instructions found on a page. A clean result means no known hijack pattern found, not a full content-safety guarantee.

Endpoints

URLTransportStateLatencyChecked
https://www.edgethirteen.com/api/mcp/cloakcheck streamable-http answering 46 ms 6 min ago

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Cloakcheck — questions

Answers built from our own checks of this server.

What can Cloakcheck do?
It exposes 1 tools, read directly from the server on our last check. Among them: check_page_for_agent_hijacking. 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 Cloakcheck working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 0 of 91 checks got a reply (0.0%), average response time 46 ms. The bar chart above shows every period we have measured.
The registry lists Cloakcheck as active — why does it not respond?
The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.
How do I connect Cloakcheck?
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 Cloakcheck need an API key?
No. Cloakcheck completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.