Libofcongress MCP server

online · 100% uptime

by cyanheads·io.github.cyanheads/libofcongress-mcp-server·v0.6.0·4 stars

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

A93/100grade A

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Safety scan

A93/100

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Adoption

Growing

4 stars282 downloads/wk

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How Libofcongress compares

Against every graded Web search MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score: 93/100; higher than 95% of 3,470 Web search servers
Uptime: 100%; of our recent checks; the typical remote Web search server answers 100%
Response time: 542 ms; faster than 27% of 2,238 Web search servers
GitHub stars: 4; more than 75% of 1,786 Web search servers
Downloads a week: 282; more than 76% of 827 Web search servers with a package

Release history: 8 versions in the registry since 2026-08-22, latest 2026-11-03, typically one every 7 days.

Install Libofcongress in Claude Code, Cursor or VS Code

claude mcp add --transport http libofcongress-mcp-server https://libofcongress.caseyjhand.com/mcp

Add to Cursor

What the publisher says

From the Libofcongress repository's README, as published. We do not edit it. Read it on GitHub

@cyanheads/libofcongress-mcp-server Search LOC digital collections, browse Chronicling America newspapers with full OCR text, and look up LC Subject Headings via MCP. STDIO or Streamable HTTP. 6 Tools • 1 Resource

Public Hosted Server: https://libofcongress.caseyjhand.com/mcp

Overview

Library of Congress digital collections, Chronicling America newspaper archives, and LC Subject Headings (LCSH) authority data. Search items and newspaper pages, retrieve full item metadata and OCR text, resolve LCSH subject terms, and browse curated collections from any MCP client. Runs as a stdio process, a local Streamable HTTP server, or the public hosted endpoint above.

Tools

Resources

All resource data is also reachable via libofcongressgetitem. Use libofcongress_search to discover item IDs first.

Capability reference

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Libofcongress: common questions

Is Libofcongress MCP server safe?: Yes, by our scan: it is graded A (93/100). Read the Libofcongress safety report
How do I install Libofcongress?: It runs remotely at libofcongress.caseyjhand.com. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Libofcongress need an API key?: No secret keys are declared. It reads 13 settings from the environment.
Is Libofcongress maintained?: The last commit was 42 days ago (2026-09-22). The latest release is v0.6.0.
Is Libofcongress up?: 100% of our last 28 checks got an answer. We check remote servers about four times a day.
What can I use instead of Libofcongress?: Servers from other publishers that do the same job: Airweave Search MCP server.
How does Libofcongress compare with other Web search MCP servers?: safety score 93/100 (higher than 95% of 3,470 Web search servers); uptime 100% (of our recent checks; the typical remote Web search server answers 100%); response time 542 ms (faster than 27% of 2,238 Web search servers). Full comparison.

Alternatives to Libofcongress

Same job from other publishers: the closest match first, then the best rated.

Airweave Search
MCP server for searching Airweave collections with natural language queries.
not reviewed
Established
C

Run it through the gateway

With the gateway added, ask your agent for it by name:

agent prompt

call io.github.cyanheads/libofcongress-mcp-server → <tool>

Free per call. Metered, capped by your key, logged for reliability.

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Rating: —
Safety grade: A · 93/100
Stars: 4
Downloads/wk: 282
Price: Free
Licence: Apache-2.0
Transport: Remote · mixed
Uptime: 100% · 28/28 checks
Version: 0.6.0
Category: Web search
Last release: 2026-09-22

Credentials it needs

LOC_USER_AGENTUser-Agent header sent with LOC API requests. LOC recommends a descriptive value for polite access.
LOC_REQUEST_DELAY_MSDelay in milliseconds between LOC API requests to stay under the 20 req/min rate limit.
MCP_LOG_LEVELSets the minimum log level for output (e.g., 'debug', 'info', 'warn').
MCP_SESSION_MODEHTTP session mode: auto, stateful, or stateless.
MCP_TRANSPORT_TYPESelects the HTTP transport.
LOC_USER_AGENTUser-Agent header sent with LOC API requests. LOC recommends a descriptive value for polite access.
LOC_REQUEST_DELAY_MSDelay in milliseconds between LOC API requests to stay under the 20 req/min rate limit.
MCP_HTTP_HOSTThe hostname for the HTTP server.
MCP_HTTP_PORTThe port to run the HTTP server on.
MCP_HTTP_ENDPOINT_PATHThe endpoint path for the MCP server.
MCP_AUTH_MODEAuthentication mode to use: 'none', 'jwt', or 'oauth'.
MCP_LOG_LEVELSets the minimum log level for output (e.g., 'debug', 'info', 'warn').
MCP_SESSION_MODEHTTP session mode: auto, stateful, or stateless.

Endpoint

https://libofcongress.caseyjhand.com/mcp

streamable-http

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