io.github.cyanheads/openlibrary-mcp-server
openlibrary-mcp-server
Search books and authors, fetch editions, browse subjects, and resolve cover images.
alive probed 2026-10-09 · HTTP 200
10tools
5.3ktokens in Claude Opus 5.5
5.4ktokens in Claude Code
2.6 %of a 200k context window
3.1ko200k_base estimate
321 msto initialize
79 msto list tools
- Endpoint
- https://openlibrary.caseyjhand.com/mcp (streamable-http)
- Host
- openlibrary.caseyjhand.com
- Protocol
- 2025-11-25
- Reports itself as
- openlibrary-mcp-server 0.3.1
- Capabilities
- logging, prompts, resources, tools
- Instructions
- 960 characters
- Claude count
- Claude Opus 5.5, measured 2026-10-05. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/cyanheads/openlibrary-mcp-server
- Registry
- active, updated 2026-10-08 · registry entry
- Reachable
- 7 of the last 7 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| openlibrary_search_books | 582 | 19 % |
| openlibrary_get_cover_url | 489 | 16 % |
| openlibrary_get_edition | 453 | 14 % |
| openlibrary_search_inside | 331 | 11 % |
| openlibrary_get_editions | 284 | 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 |
|---|---|---|---|---|---|
| 2026-10-09 11:18 | alive | 484 ms | 10 | 5.3k | 3.1k |
| 2026-10-05 14:39 | alive | 321 ms | 10 | 5.3k | 3.1k |
| 2026-10-05 00:33 | alive | 181 ms | 10 | 3.1k | |
| 2026-10-04 10:04 | alive | 259 ms | 10 | 3.1k | |
| 2026-10-04 07:57 | alive | 267 ms | 10 | 3.1k | |
| 2026-10-03 20:37 | alive | 776 ms | 10 | 3.1k | |
| 2026-10-03 17:53 | alive | 422 ms | 10 | 3.1k |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.cyanheads/openlibrary-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.