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Cited Brief MCP Server

by workers-cited-brief-cited-brief Your server? Claim it
answering

Cited Brief is answering right now. Last checked 11 min ago. It exposes 7 tools.

Paid web research tools: cited briefs, quote checks, page text. Pay per call in USDC via x402.

Uptime history 22 days of history
22 days agonow
100.0%
Uptime 24h
91 of 91 checks
7
Tools
read from the server
543 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 13 October 2026. No other catalogue keeps this.

13 Oct 4 tools appeared check_doi, check_links, domain_check and 1 more
13 Oct a tool changed version

Nothing serious here today

Today is the operative word: we check Cited Brief 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 11 min ago.

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

Available tools 7

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

cited
cited_brief
Answers a question from 1-5 web pages you name. Every claim comes with a verbatim quote that is re-checked on the live page; claims that fail are dropped, and if none pass you are not charged. Price: $0.10 USDC per call (x402).
doi
check_doi
Looks up 1-10 DOIs or arXiv ids: does the paper exist, its title, authors, year and venue, how often it is cited, and whether it has been retracted. Pass the titles you cited to see if they match the real ones. Catches made-up references. No AI involved; if the lookup services are down you are not charged. Price: $0.01 USDC per call (x402).
domain
domain_check
Domain age and registration facts (created, expires, registrar, status, nameservers) from the registry's RDAP or WHOIS service, plus live DNS (address records, mail servers, SPF, DMARC) and plain flags such as "registered only 9 days ago". Use it to judge how trustworthy a site is. No AI involved. Works for most TLDs (.com, .org, .io, .ai, .dev, .co.uk and over a thousand more); if the registry has no public lookup (for example .de, .jp, .co, .ru, .ac.uk) or does not answer, you are not charged. Price: $0.02 USDC per call (x402).
links
check_links
Checks 1-10 URLs: HTTP status, where redirects end, the page title, and a warning when a "200" page is really a not-found page. Use it to catch dead or made-up citations. No AI involved; a dead link is a valid answer, but a request with no usable URL is not charged. Price: $0.01 USDC per call (x402).
page
page_text
Fetches a public web page and returns its title and readable text, without scripts, styles or markup (up to 100,000 characters). If the page can't be read you are not charged. Price: $0.01 USDC per call (x402).
quote
check_quote
Checks whether 1-10 quotes really appear on a web page (ignoring case, spacing, and quote or dash styles) and returns the surrounding text. Use it to catch made-up citations. No AI involved; if the page can't be read you are not charged. Price: $0.01 USDC per call (x402).
robots
robots_check
Reads the site's robots.txt and says whether a crawler may fetch a URL (RFC 9309: the longest matching rule wins, Allow wins a tie), with the matching rule, crawl-delay and sitemaps. No AI involved; if robots.txt cannot be read you are not charged. Price: $0.01 USDC per call (x402).

Endpoints

URLTransportStateLatencyChecked
https://cited-brief.cited-brief.workers.dev/mcp streamable-http answering 634 ms 11 min ago

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Cited Brief — questions

Answers built from our own checks of this server.

What can Cited Brief do?
It exposes 7 tools, read directly from the server on our last check. Among them: check_doi, check_links, check_quote, cited_brief, domain_check, page_text and 1 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 →
Is Cited Brief 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 543 ms. The bar chart above shows every period we have measured.
How do I connect Cited Brief?
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 Cited Brief need an API key?
No. Cited Brief completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 7 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Cited Brief?
It answers our handshake in 543 ms on average, which is faster than 22% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.