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CitedBy

Official registry Search and web

Check a page, AI-crawler access, llms.txt and backlinks of a site. Free, read-only.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http citedby 'https://citedby.eu/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "citedby": {
            "type": "http",
            "url": "https://citedby.eu/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. CitedBy MCP server
  2. Tools
  3. Install
  4. Ask it like this
  5. Limits

CitedBy MCP server

Ask your AI tool to check whether a website can be found and cited by AI assistants and search engines. Free, no account, read-only.

Server address: https://citedby.eu/mcp (MCP Streamable HTTP, no sign-in). Page with the same instructions: https://citedby.eu/mcp-server

Tools

ToolWhat you get
check_pageOne page, fetched as CitedBot (robots.txt respected): what is wrong for AI answers and search, each finding with why it matters and the exact fix. Deterministic checks only.
check_ai_crawler_accessFor GPTBot, OAI-SearchBot, ChatGPT-User, PerplexityBot, ClaudeBot, Google-Extended, Bingbot and Googlebot: allowed by robots.txt, and answered by the server, or not.
check_llms_txtWhether /llms.txt exists, whether its links work, whether /llms-full.txt exists.
backlinksHow many domains link to a domain, and the strongest ones, from the Common Crawl web graph. Says when a domain is not in the data.

When a site refuses the crawler or does not answer, the tool says so. It does not score what it could not read.

Install

Claude Code

claude mcp add --transport http citedby https://citedby.eu/mcp

or install the plugin, which also adds a skill that picks the right tool for the question:

/plugin marketplace add resaleiq/citedby-mcp
/plugin install citedby@citedby

Claude on the web and desktop: Settings, Connectors, Add custom connector, paste https://citedby.eu/mcp.

Cursor: add CitedBy to Cursor, or add to ~/.cursor/mcp.json:

{ "mcpServers": { "citedby": { "url": "https://citedby.eu/mcp" } } }

Codex

codex mcp add citedby --url https://citedby.eu/mcp

Any other MCP client: add a remote server with the address above.

Ask it like this

  • "Check https://example.com/pricing with CitedBy and tell me what to fix first."
  • "Can GPTBot and PerplexityBot read example.com?"
  • "Does example.com have a working llms.txt?"
  • "Which domains link to example.com?"

Limits

40 checks an hour from one address; a result is reused for up to 6 hours (1 hour for a page check). check_page is one page. A whole-site audit, with every page up to your plan's limit and the exact fix for each, is at https://citedby.eu/plans.

Also from CitedBy: citedby-check, the same AI-crawler check as a command-line tool and GitHub Action.

Questions: hello@citedby.eu. MIT licence.

Frequently asked questions

What is CitedBy?

Check a page, AI-crawler access, llms.txt and backlinks of a site. Free, read-only.

How do I install CitedBy?

It runs as a remote server. In Claude Code: claude mcp add --transport http citedby 'https://citedby.eu/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does CitedBy need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is CitedBy open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains CitedBy?

It is published by resaleiq. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.