Koskamo

CitedBy MCP

An MCP server that allows AI agents to audit web pages for AI-search readiness. It checks AI-crawler access (robots.txt), validates llms.txt files, analyzes page content for SEO issues, and retrieves backlink data from Common Crawl. The service is free, read-only, and requires no account.

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Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

CitedBy MCP logo, by CitedByVendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-01Operated by CitedBy
MCP endpoint (Streamable HTTP)
https://citedby.eu/mcp
Vendor documentation

What you can do with it

  • Check if AI crawlers like GPTBot can access a site
  • Validate llms.txt existence and functionality
  • Audit page content for AI-search optimization
  • Retrieve top referring domains for a site

Source and maintenance

Vendor evidenceRegistry 1.0.0
mcp-registry: eu.citedby/citedby@1.0.0Source repositoryProject website
Maintenance checked

Protocol and capabilities

Server
citedby 1.0.0
MCP protocol
2025-06-18
Tools
4 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": false
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

CitedBy checks whether a website can be found and cited by AI assistants and search engines. Every tool is read-only and free. check_page fetches one page as CitedBot (robots.txt respected) and lists what to fix, with the fix. check_ai_crawler_access says which AI crawlers a site lets in. check_llms_txt reads /llms.txt. backlinks lists the domains that link to a site, from Common Crawl open data. A whole-site audit with every page needs a plan at https://citedby.eu/plans.

Tools

4 advertised

check_page — Check one page for AI-search and SEO problems
Advertised by the server during the last successful anonymous check.
Advertised read-onlyOpen-world

Fetch one public web page as CitedBot (robots.txt respected) and return what is wrong with it for AI answers and search: title, description, headings, structured data, canonical, language, links and more. Each finding has why it matters and the exact fix. Deterministic checks only; says so when the page cannot be fetched.

check_page input schema
{
  "type": "object",
  "required": [
    "url"
  ],
  "properties": {
    "url": {
      "type": "string",
      "description": "Full page address, for example https://example.com/pricing"
    }
  },
  "additionalProperties": false
}
check_page annotations
{
  "title": "Check one page",
  "readOnlyHint": true,
  "openWorldHint": true,
  "idempotentHint": true,
  "destructiveHint": false
}
check_ai_crawler_access — Which AI crawlers can read this site
Advertised by the server during the last successful anonymous check.
Advertised read-onlyOpen-world

Read a site's robots.txt and test the server for GPTBot, OAI-SearchBot, ChatGPT-User, PerplexityBot, ClaudeBot, Google-Extended, Bingbot and Googlebot. Returns, per crawler, whether robots.txt allows it and whether the server answers it, so you can see who is blocked and by what.

check_ai_crawler_access input schema
{
  "type": "object",
  "required": [
    "site"
  ],
  "properties": {
    "site": {
      "type": "string",
      "description": "Domain or address of the site, for example example.com"
    }
  },
  "additionalProperties": false
}
check_ai_crawler_access annotations
{
  "title": "AI crawler access",
  "readOnlyHint": true,
  "openWorldHint": true,
  "idempotentHint": true,
  "destructiveHint": false
}
check_llms_txt — Check a site's llms.txt
Advertised by the server during the last successful anonymous check.
Advertised read-onlyOpen-world

Fetch /llms.txt of a site and report whether it exists, whether its links work, and whether /llms-full.txt exists. When there is none, the full report holds a draft built from the site's own pages.

check_llms_txt input schema
{
  "type": "object",
  "required": [
    "site"
  ],
  "properties": {
    "site": {
      "type": "string",
      "description": "Domain or address of the site, for example example.com"
    }
  },
  "additionalProperties": false
}
check_llms_txt annotations
{
  "title": "llms.txt check",
  "readOnlyHint": true,
  "openWorldHint": true,
  "idempotentHint": true,
  "destructiveHint": false
}
backlinks — Referring domains of a domain (open data)
Advertised by the server during the last successful anonymous check.
Advertised read-only

How many other domains link to a domain, and the strongest referrers, from the Common Crawl domain web graph. Covers domains with 100 or more referring domains under .eu, EU and UK country domains, plus the 5,000 most-linked sites; says plainly when a domain is not in the data.

backlinks input schema
{
  "type": "object",
  "required": [
    "domain"
  ],
  "properties": {
    "domain": {
      "type": "string",
      "description": "Domain, for example example.com"
    }
  },
  "additionalProperties": false
}
backlinks annotations
{
  "title": "Referring domains",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
681 ms
95th percentile latency
681 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 681 ms · metadata changed · 4 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http citedby-mcp https://citedby.eu/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add citedby-mcp --url https://citedby.eu/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable citedby-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "citedby-mcp": {
      "url": "https://citedby.eu/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "citedby-mcp": {
      "type": "streamableHttp",
      "url": "https://citedby.eu/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start citedby-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "citedby-mcp": {
      "type": "http",
      "url": "https://citedby.eu/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http citedby-mcp https://citedby.eu/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.
Claude Desktop configuration
{
  "mcpServers": {
    "citedby-mcp": {
      "url": "https://citedby.eu/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "citedby-mcp": {
      "serverUrl": "https://citedby.eu/mcp"
    }
  }
}

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