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libofcongress-mcp-server MCP Server

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

Publisher claimed. No tool list reported, and Pod has not connected to this server.

Status

Pod has not dialled libofcongress-mcp-server yet, so everything on this page is what its publisher reported rather than what we observed. Registries describe servers; they do not connect to them. Until a check runs, treat the tool list below as a claim.

Connect

Published as @cyanheads/libofcongress-mcp-server on npm. Runs locally.

Known issues

40 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded — those are release checklists and internal refactors, not things that will go wrong for you. Showing 12.

Most discussed

bug(loc_get_item,loc_get_newspaper_page): internal LOC API URL with query params leaked in not-found error messages

Not-found errors from libofcongress_get_item, libofcongress_get_newspaper_page, and the libofcongress://item/{item_id} resource expose the full internal LOC API URL — including query parameters like ?fo=json&at=item,resources,related_items — in data.url. The same leak occurs in serviceUnavailable errors when the LOC API returns an HTML body instead of JSON (rate-limited or maintenance page).

Steps to reproduce

  1. Call libofcongress_get_item with input: `{ "item_id": "TOTALLY_

Read the thread · 2026-05-24 · closed · 6 comments

bug(loc_get_item): format() truncates related_items at 5 without indicating truncation — parity gap with structuredContent

Server version

0.1.0

mcp-ts-core version

0.9.9

Runtime

Node.js

Runtime version

Node v25.9.0

Transport

HTTP (Streamable HTTP)

Description

libofcongress_get_item's format() caps both related_items and resource_links at 5 entries in content[]. Originally this was a silent drop (see comments below); a first fix added an "… and N more" overflow note to both blocks. Reopened: disclosure isn't the same as access. An overflow count tells a content[]-onl

Read the thread · 2026-05-24 · closed · 5 comments

bug(search_subjects): returns non-LCSH authority records

Server version

0.2.10

mcp-ts-core version

^0.10.9

Runtime

Bun

Runtime version

Bun 1.3.11

Transport

HTTP

Description

libofcongress_search_subjects is described as returning Library of Congress Subject Headings for use as the subject filter in libofcongress_search, but the live endpoint response includes name-authority and children-subject records ahead of real subject headings. That can send callers to labels that are not LCSH subject headings and may not

Read the thread · 2026-06-27 · closed · 3 comments

feat(get_item): expose research-critical metadata currently discarded

libofcongress_get_item describes itself as returning the full metadata record, but normalization drops several high-value fields already present in the requested item payload. The gap is most consequential for summaries, catalog identifiers, language/location context, and access restrictions.

Proposal

Expand the existing output with a curated set of research-critical fields rather than forwarding raw LOC JSON: summary, languages, locations, call_number, former_ids, `original_f

Read the thread · 2026-07-16 · closed · 2 comments

feat(search): add collection_slug to complete the browse-to-search workflow

libofcongress_browse_collections returns stable collection slugs, but no MCP tool can use them to search inside that collection. The design documentation already describes the slug as a libofcongress_search input, while the actual search schema has no collection/part-of filter.

Proposal

Add an optional collection_slug parameter to libofcongress_search. When present, route the existing query/filter/pagination shape through the corresponding collection endpoint so browse results becom

Read the thread · 2026-07-16 · closed · 2 comments

Most recent

bug(errors): item_not_found and page_not_found reach the client with no recovery hint

Server version

0.2.16

mcp-ts-core version

0.10.14

Runtime

Bun

Runtime version

Bun 1.3.x

Transport

HTTP

Description

The item_not_found and page_not_found contract entries declare useful recovery metadata, but neither throw site passes { recovery: { hint } }, so nothing reaches the wire. Both re-throw the service's message verbatim, and on a 404 that message is the generic notFound('LOC resource not found') raised inside fetchJson — it never names the

Read the thread · 2026-08-10 · open · 0 comments

feat(get_newspaper_page): request at=item,resource so newspaper_title, state, and edition stop coming back empty

Use case

libofcongress_get_newspaper_page declares newspaper_title, state, and edition in its output schema, and never populates any of them. The request asks LOC for ?fo=json&at=resource, and that projection returns exactly seven keys — fulltext_file, iiif_manifest_url, image, pdf, segment_count, url, word_coordinates. The title, date_issued, part_of, and sequence the handler reads are all null there, so state and edition are always absent and `part_of

Read the thread · 2026-08-10 · open · 0 comments

bug(search_subjects): count is the suggest endpoint's record tally, not the LOC item count it is described as

Server version

0.2.16

mcp-ts-core version

0.10.14

Runtime

Bun

Runtime version

Bun 1.3.x

Transport

HTTP

Description

libofcongress_search_subjects describes count as "Approximate number of LOC items carrying this heading." It is parsed from the third array of the id.loc.gov /suggest/ OpenSearch response, which carries a per-suggestion description string — "1 result", "2 results" — counting matching authority records, not catalogued items. parseInt r

Read the thread · 2026-08-10 · open · 0 comments

bug(pagination): LOC 404s out-of-range pages, so recovery guidance is skipped and a valid collection_slug is reported missing

Server version

0.2.16

mcp-ts-core version

0.10.14

Runtime

Bun

Runtime version

Bun 1.3.x

Transport

HTTP

Description

fetchSearchJson treats only HTTP 400 and 520 as "page out of range" (allowStatus: [400, 520] → null → the pages: 0 sentinel handlers key their recovery notice on). LOC actually answers a past-the-end page with 404 on every endpoint except /search/:

Endpoint Out-of-range status Result today
/search/ (no `f

Read the thread · 2026-08-10 · open · 0 comments

bug(get_item): object-form item.related_items violates the output schema and fails the call

Server version

0.2.16

mcp-ts-core version

0.10.14

Runtime

Bun

Runtime version

Bun 1.3.x

Transport

HTTP

Description

libofcongress_get_item fails outright for any item whose item.related_items entries are objects rather than strings. RawLocItemResponse types the field as string[] and getItem spreads it straight into the normalized related_items: string[]:

relatedItems.push(...(item.related_items ?? []));

LOC returns objects (`{ title, url

Read the thread · 2026-08-10 · open · 0 comments

bug(tests): LOC_REQUEST_DELAY_MS override is a no-op, so the mocked suite sleeps ~137s

Server version

0.2.12

mcp-ts-core version

0.10.14

Runtime

Bun

Runtime version

Bun 1.3.14

Transport

stdio

Description

bun run test takes ~137s. The same suite with LOC_REQUEST_DELAY_MS=0 in the environment takes ~975ms — a ~140x difference on a suite that mocks fetch and never reaches the network. The suite already tries to disable pacing per test, but the override never takes effect.

The cause is an ordering/caching interaction:

Read the thread · 2026-07-16 · closed · 1 comment

bug(browse_collections): returned slugs do not match LOC collection routes

Server version

0.2.12

mcp-ts-core version

0.10.14

Runtime

Bun 1.3.14

Transport

HTTP

Description

libofcongress_browse_collections describes slug as the identifier within loc.gov collection URLs, but the extractor only matches URLs ending immediately after /collections/<slug>/. Current LOC results end in /about-this-collection/, so the regex misses and fabricates a title-derived fallback that often is not a valid route.

Steps to reproduce

  1. Call `libofco

Read the thread · 2026-07-16 · closed · 1 comment

See all 21 reports Pod holds for libofcongress-mcp-server — of 40 qualified upstream.

Firsthand observations

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