MCP Libraryofcongress 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 mcp-libraryofcongress -- npx -y mcp-libraryofcongress

{
  "mcpServers": {
    "mcp-libraryofcongress": {
      "args": [
        "-y",
        "mcp-libraryofcongress"
      ],
      "command": "npx"
    }
  }
}

[mcp_servers.mcp-libraryofcongress]
command = "npx"
args = ["-y", "mcp-libraryofcongress"]

{
  "mcpServers": {
    "mcp-libraryofcongress": {
      "args": [
        "-y",
        "mcp-libraryofcongress"
      ],
      "command": "npx"
    }
  }
}

{
  "mcpServers": {
    "mcp-libraryofcongress": {
      "args": [
        "-y",
        "mcp-libraryofcongress"
      ],
      "command": "npx"
    }
  }
}

This one needs environment variables set before it will start: LOC_USER_AGENT (Identify your own client. The project's own identifier is appended, so the Library can always reach a human.), LOC_MIN_INTERVAL_MS (Minimum milliseconds between requests. Default 6000, floor 3000.), LOC_TIMEOUT_MS (Deadline for one catalogue, record or collection request, in milliseconds. Default 30000.), LOC_NEWSPAPER_TIMEOUT_MS (Deadline for one search_newspapers request, in milliseconds. The full-text corpus answers in tens of seconds. Default 90000.), LOC_LOG_LEVEL (silent, error, info or debug. Default error. Logs go to stderr.). The author declared them in the registry entry; get the values from the project itself.