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io.github.cyanheads/libofcongress-mcp-server

Search LOC digital collections, Chronicling America newspapers (full OCR), and LC Subject Headings.

Install

Add the config to your client settings. Replace values in <angle brackets> with your own.

claude_desktop_config.json

{
  "mcpServers": {
    "libofcongress-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/libofcongress-mcp-server@0.5.0"
      ],
      "env": {
        "LOC_USER_AGENT": "libofcongress-mcp-server/0.5.0",
        "LOC_REQUEST_DELAY_MS": "3100",
        "MCP_LOG_LEVEL": "info",
        "MCP_SESSION_MODE": "stateless"
      }
    }
  }
}

Details

Name: io.github.cyanheads/libofcongress-mcp-server
Version: 0.5.0
Updated: Oct 15, 2026
Source: Official MCP Registry
Repository: https://github.com/cyanheads/libofcongress-mcp-server