Libraryofcongress MCP Server

by smeet666io.github.smeet666/mcp-libraryofcongressv3.0.1

Full-text search of the Library of Congress's digitised American newspapers, plus catalogue search by media type and curated collections.

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Active1d ago

Install Libraryofcongress MCP server

claude mcp add libraryofcongress -- npx -y mcp-libraryofcongress

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

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

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

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "libraryofcongress": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "mcp-libraryofcongress"
      ]
    }
  }
}

Add to .vscode/mcp.json in your workspace.

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

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
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.