io.github.cyanheads/libofcongress-mcp-server MCP Server

io.github.cyanheads/libofcongress-mcp-server

Repository Registry

What is the io.github.cyanheads/libofcongress-mcp-server MCP server?

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

How to install io.github.cyanheads/libofcongress-mcp-server

Copy-paste configuration for popular MCP clients.

transport: stdio

Config generated by PluginBench — verify against the source before use.

Environment / auth

LOC_USER_AGENT
User-Agent header sent with LOC API requests. LOC recommends a descriptive value for polite access.
LOC_REQUEST_DELAY_MS
Delay in milliseconds between LOC API requests to stay under the 20 req/min rate limit.
MCP_LOG_LEVEL
Sets the minimum log level for output (e.g., 'debug', 'info', 'warn').
MCP_SESSION_MODE
HTTP session mode: auto, stateful, or stateless.
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'.

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "libofcongress-mcp-server": {
      "command": "bun",
      "args": [
        "-y",
        "@cyanheads/libofcongress-mcp-server",
        "run",
        "start:stdio"
      ],
      "env": {
        "LOC_USER_AGENT": "<YOUR_LOC_USER_AGENT>",
        "LOC_REQUEST_DELAY_MS": "<YOUR_LOC_REQUEST_DELAY_MS>",
        "MCP_LOG_LEVEL": "<YOUR_MCP_LOG_LEVEL>",
        "MCP_SESSION_MODE": "<YOUR_MCP_SESSION_MODE>",
        "MCP_HTTP_HOST": "<YOUR_MCP_HTTP_HOST>",
        "MCP_HTTP_PORT": "<YOUR_MCP_HTTP_PORT>",
        "MCP_HTTP_ENDPOINT_PATH": "<YOUR_MCP_HTTP_ENDPOINT_PATH>",
        "MCP_AUTH_MODE": "<YOUR_MCP_AUTH_MODE>"
      }
    }
  }
}

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