Crossref MCP Server

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

claude mcp add crossref-mcp-server -- npx -y @cyanheads/crossref-mcp-server

{
  "mcpServers": {
    "crossref-mcp-server": {
      "args": [
        "-y",
        "@cyanheads/crossref-mcp-server"
      ],
      "command": "npx"
    }
  }
}

[mcp_servers.crossref-mcp-server]
command = "npx"
args = ["-y", "@cyanheads/crossref-mcp-server"]

{
  "mcpServers": {
    "crossref-mcp-server": {
      "args": [
        "-y",
        "@cyanheads/crossref-mcp-server"
      ],
      "command": "npx"
    }
  }
}

{
  "mcpServers": {
    "crossref-mcp-server": {
      "args": [
        "-y",
        "@cyanheads/crossref-mcp-server"
      ],
      "command": "npx"
    }
  }
}

This one needs environment variables set before it will start: CROSSREF_MAILTO (Email for polite-pool User-Agent header — optional. Without: anonymous pool with stricter rate limits.), CROSSREF_BASE_URL (Override the Crossref API base URL. Defaults to https://api.crossref.org.), CROSSREF_TIMEOUT_MS (Per-request timeout in milliseconds.), MCP_HTTP_HOST (The hostname for the HTTP server.), MCP_HTTP_PORT (The port to run the HTTP server on.), MCP_HTTP_ENDPOINT_PATH (The endpoint path for the MCP server.), MCP_AUTH_MODE (Authentication mode to use: 'none', 'jwt', or 'oauth'.), MCP_LOG_LEVEL (Sets the minimum log level for output (e.g., 'debug', 'info', 'warn').). The author declared them in the registry entry; get the values from the project itself.