Libofcongress-mcp-server MCP Server

Libofcongress-mcp-server is an MCP integration. Search LOC digital collections, Chronicling America newspapers (full OCR), and LC Subject Headings.

Hosted connection

The registry lists a streamable-http connection at https://libofcongress.caseyjhand.com/mcp.

Packages and local setup

The published npm package is @cyanheads/libofcongress-mcp-server, version 0.3.1. Its declared MCP transport is stdio.

The package declares 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..

The published npm package is @cyanheads/libofcongress-mcp-server, version 0.3.1. Its declared MCP transport is streamable-http.

The package declares MCP_TRANSPORT_TYPE: Selects the HTTP transport.; 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_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').; MCP_SESSION_MODE: HTTP session mode: auto, stateful, or stateless..

Before connecting

Check the maintainer’s instructions for account access, authentication and the supported client configuration. Once connected, inspect the tools your client receives and try a small task that matches the server’s stated purpose. The registry description does not include a verified, complete tool list.

Project and source

View the publisher’s registry entry · Project repository. This profile uses version 0.3.1 from the registry. Registration identifies the publisher namespace; it does not establish that this is a first-party integration for every service it connects.

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