Citation Checker MCP MCP server

The Citation Checker MCP server allows AI agents to verify the authenticity of bibliographic references and check if academic papers have been retracted. It sources data from Crossref, the DOI system, and OpenAlex to provide factual validation of citations.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by OpenKrill

MCP endpoint (Streamable HTTP)

https://citations.openkrill.app/mcp

Vendor documentation

What you can do with it

Verify if a provided bibliography reference is real
Check if a specific academic paper has been retracted
Validate citations using Crossref and OpenAlex data

Tools advertised by the last live check:

check_references
submit_feedback
get_feedback_reply
index_tools

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 a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http citation-checker-mcp https://citations.openkrill.app/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 citation-checker-mcp --url https://citations.openkrill.app/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable citation-checker-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "citation-checker-mcp": {
      "url": "https://citations.openkrill.app/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "citation-checker-mcp": {
      "type": "streamableHttp",
      "url": "https://citations.openkrill.app/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start citation-checker-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "citation-checker-mcp": {
      "type": "http",
      "url": "https://citations.openkrill.app/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 citation-checker-mcp https://citations.openkrill.app/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": {
    "citation-checker-mcp": {
      "url": "https://citations.openkrill.app/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": {
    "citation-checker-mcp": {
      "serverUrl": "https://citations.openkrill.app/mcp"
    }
  }
}

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