MCP server

Libofcongress

io.github.cyanheads/libofcongress-mcp-server

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Source

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

6

Token cost

About 4,329 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.libofcongress-mcp-server]
url = "https://libofcongress.caseyjhand.com/mcp"

Gemini CLI

{"mcpServers":{"libofcongress-mcp-server":{"httpUrl":"https://libofcongress.caseyjhand.com/mcp"}}}

Cursor

{"mcpServers":{"libofcongress-mcp-server":{"url":"https://libofcongress.caseyjhand.com/mcp"}}}

VS Code

{"servers":{"libofcongress-mcp-server":{"type":"http","url":"https://libofcongress.caseyjhand.com/mcp"}}}

Antigravity

agy mcp add libofcongress-mcp-server https://libofcongress.caseyjhand.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"libofcongress-mcp-server","server_url":"https://libofcongress.caseyjhand.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"libofcongress-mcp-server","server_url":"https://libofcongress.caseyjhand.com/mcp"}

Tools

• libofcongress_browse_collections Browses the web · ~325 tokens
  List and browse Library of Congress curated digital collections. Returns collection names, descriptions, item counts, slugs, and URLs. Optionally filter by keyword. Collections are curated subsets of the digital holdings with specific focuses (e.g., "Civil War Glass Negatives", "Baseball Cards", "WP
• libofcongress_get_item ~820 tokens
  Retrieve the full metadata record for a specific LOC digital item. Returns the imprint (place, publisher, and date of publication), contributors, LCSH subject headings and the subject terms the search subject filter accepts, summary, languages, locations, rights information, physical description, ca
• libofcongress_get_newspaper_page ~859 tokens
  Retrieve the full text of one LOC page — a historical newspaper page, or a book or manuscript page — or, with match, only the passages around your search terms, with its publication metadata: for newspapers the title, issue date, place of publication, indexed states, and edition; for every page its
• libofcongress_search_items ~1039 tokens
  Search the Library of Congress digital collections by keyword. Optionally filter by material format (photos, maps, newspapers, audio, etc.), date range, subject heading, or geographic location, or scope the search to a single curated collection with collection_slug. Returns item summaries with title
• libofcongress_search_newspapers ~937 tokens
  Search historical newspaper pages in the Chronicling America corpus. Returns matching pages with the opening of each page's OCR text (~500 characters), publication title, date, the states LOC indexes the title under, and the page URL needed for libofcongress_get_newspaper_page. Filters by keyword, d
• libofcongress_search_subjects ~349 tokens
  Search Library of Congress Subject Headings (LCSH) by keyword. Returns authorized subject headings and their URIs, ranked by relevance with a heading that exactly matches the query first; a partial word with no keyword match returns the headings that begin with it. Use the returned label as the subj

Browse

• GitHub tools
• PDF tools
• OCR (text from images)
• GitHub and code hosting
• Speech to text

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