Name: libofcongress-mcp-server
Author: cyanheads

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Description

libofcongress_search

Search LOC digital collections by keyword with optional format, date range, subject heading, and geographic location filters. Returns item summaries with IDs for follow-up retrieval.

libofcongress_get_item

Retrieve full metadata for a specific LOC item — contributors, subjects, rights, physical description, resource links (TIFF/JPEG/PDF), and related items.

libofcongress_search_newspapers

Search historical newspaper pages in the Chronicling America corpus. Returns pages with OCR text excerpts (~500 chars), publication title, date, state, and the URL needed for libofcongress_get_newspaper_page.

libofcongress_get_newspaper_page

Retrieve the full OCR text of a specific newspaper page. Pass the url field from a libofcongress_search_newspapers result. Returns ocr_available: false when the page has no digitized text.

libofcongress_search_subjects

Search Library of Congress Subject Headings (LCSH) by keyword. Returns controlled-vocabulary labels and URIs — use the label as the subject filter in libofcongress_search.

libofcongress_browse_collections

List and browse LOC curated digital collections with descriptions, item counts, and slugs. Optionally filter by keyword.

@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

Tools

Six tools covering the Library of Congress digital holdings — general search with format/date/subject/location filters, full item retrieval, Chronicling America newspaper search with OCR, single-page full-text fetch, LCSH subject heading lookup, and curated collection browsing:

Tool	Description
`libofcongress_search`	Search LOC digital collections by keyword with optional format, date range, subject heading, and geographic location filters. Returns item summaries with IDs for follow-up retrieval.
`libofcongress_get_item`	Retrieve full metadata for a specific LOC item — contributors, subjects, rights, physical description, resource links (TIFF/JPEG/PDF), and related items.
`libofcongress_search_newspapers`	Search historical newspaper pages in the Chronicling America corpus. Returns pages with OCR text excerpts (~500 chars), publication title, date, state, and the URL needed for `libofcongress_get_newspaper_page`.
`libofcongress_get_newspaper_page`	Retrieve the full OCR text of a specific newspaper page. Pass the `url` field from a `libofcongress_search_newspapers` result. Returns `ocr_available: false` when the page has no digitized text.
`libofcongress_search_subjects`	Search Library of Congress Subject Headings (LCSH) by keyword. Returns controlled-vocabulary labels and URIs — use the label as the `subject` filter in `libofcongress_search`.
`libofcongress_browse_collections`	List and browse LOC curated digital collections with descriptions, item counts, and slugs. Optionally filter by keyword.

`libofcongress_search`

Search the LOC digital collections with full-text keyword matching and facet filters.

Eight material formats: photo, map, newspaper, manuscript, audio, film, book, notated-music
Date range filtering by year (inclusive start and end)
Subject heading filter — use libofcongress_search_subjects first to get the exact LCSH spelling
Geographic location filter (e.g., "oklahoma", "washington d.c.")
Pagination up to 100 results per page; contradictory pages (LOC API edge case) returned with a clear message
Empty results include a message field with recovery hints — echoes the applied filters

`libofcongress_get_item`

Retrieve the full metadata record for a specific LOC digital item.

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@cyanheads/libofcongress-mcp-server

Tools

`libofcongress_search`

`libofcongress_get_item`

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Tools

`libofcongress_search`

`libofcongress_get_item`