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Citation Check MCP Server

answering

Citation Check is answering right now. Last checked 1 min ago. It exposes 2 tools.

Does a cited URL exist, and does the source name what your claim names? Two answers.

Uptime history 64 days of history · worst day 88%
64 days agonow
98.9%
Uptime 24h
91 of 92 checks
2
Tools
read from the server
279 ms
Response time
average over 24h
open, no key
Access
streamable-http

Citation Check missed one check this week

Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of 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 1 min ago.

run in your terminal
claude mcp add citation-check --transport http https://exmachina-ai.fly.dev/verify
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "citation-check": {
      "url": "https://exmachina-ai.fly.dev/verify"
    }
  }
}
~/.codex/config.toml
[mcp_servers.citation-check]
url = "https://exmachina-ai.fly.dev/verify"
.cursor/mcp.json
{
  "mcpServers": {
    "citation-check": {
      "url": "https://exmachina-ai.fly.dev/verify"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "citation-check": {
      "url": "https://exmachina-ai.fly.dev/verify"
    }
  }
}

Available tools 2

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

citation
check_citation
Fetch a URL and report whether it exists, and whether the source names the same entity as the claim you attach to it. These are two different questions and conflating them is the failure this exists to catch: a URL can return 200 and describe a different gene entirely. No account needed, nothing is stored about you.
verdict
verdict_meanings
The exact semantics of every status and relevance value, including what this checker cannot determine. Read once before trusting a verdict.

Endpoints

URLTransportStateLatencyChecked
https://exmachina-ai.fly.dev/verify streamable-http answering 250 ms 1 min ago

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Citation Check — questions

Answers built from our own checks of this server.

What can Citation Check do?
It exposes 2 tools, read directly from the server on our last check. Among them: check_citation, verdict_meanings. 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 Citation Check working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 92 checks got a reply (98.9%), average response time 279 ms. The bar chart above shows every period we have measured.
How do I connect Citation Check?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Citation Check need an API key?
No. Citation Check completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 2 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Citation Check?
It answers our handshake in 279 ms on average, which is faster than 47% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.