io.github.cyanheads/libofcongress-mcp-server
libofcongress-mcp-server
Search LOC digital collections, Chronicling America newspapers (full OCR), and LC Subject Headings.
alive probed 2026-10-15 · HTTP 200
6tools
5.1ktokens in Claude Opus 5.5
5.2ktokens in Claude Code
2.6 %of a 200k context window
3.3ko200k_base estimate
351 msto initialize
81 msto list tools
- Endpoint
- https://libofcongress.caseyjhand.com/mcp (streamable-http)
- Host
- libofcongress.caseyjhand.com
- Protocol
- 2025-11-25
- Reports itself as
- libofcongress-mcp-server 0.5.0
- Capabilities
- logging, prompts, resources, tools
- Instructions
- 445 characters
- Claude count
- Claude Opus 5.5, measured 2026-10-15. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/cyanheads/libofcongress-mcp-server
- Registry
- active, updated 2026-10-14 · registry entry
- Reachable
- 9 of the last 9 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| libofcongress_search_items | 838 | 26 % |
| libofcongress_search_newspapers | 838 | 26 % |
| libofcongress_get_item | 613 | 19 % |
| libofcongress_get_newspaper_page | 445 | 14 % |
| libofcongress_search_subjects | 282 | 9 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-15 10:33 | alive | 231 ms | 6 | 5.1k | 3.3k |
| 2026-10-14 18:55 | alive | 1.3 s | 6 | 3.3k | 2.0k |
| 2026-10-08 11:13 | alive | 466 ms | 6 | 3.3k | 2.0k |
| 2026-10-05 14:39 | alive | 351 ms | 6 | 3.3k | 2.0k |
| 2026-10-05 00:33 | alive | 195 ms | 6 | 2.0k | |
| 2026-10-04 10:04 | alive | 280 ms | 6 | 2.0k | |
| 2026-10-04 07:57 | alive | 258 ms | 6 | 2.0k | |
| 2026-10-03 20:37 | alive | 680 ms | 6 | 2.0k | |
| 2026-10-03 17:53 | alive | 609 ms | 6 | 2.0k |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.cyanheads/libofcongress-mcp-server)
An entry for every probe that changed the result, the tool count or the token cost: Atom feed. Add it to a feed reader or a Slack RSS app to hear when the server stops answering or its tool set grows.