io.github.8enSmith/mcp-open-library

Open Library

Is the Open Library MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-30.

Search books and authors on the Internet Archive's Open Library

alive probed 2026-11-14 · unchanged since 2026-10-30

7tools

2.4ktokens in Claude Opus 5.5

1.2 %of Claude's 200k window

0.9×the median server

587 msto initialize

17 msto list tools

Run it: npx -y mcp-open-library@1.2.6 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: mcp-open-library 1.2.6
Capabilities: tools
Instructions: none
Of a 1M window: 0.2 % of a 1M context window
Count: 2.4k tokens in Claude Opus 5.5, exact, measured 2026-10-16. With the Claude Code prefix mcp__…__ on each tool name: 2.5k. The o200k_base estimate is 1.5k. Counted again when the tool definitions change. Method.
Repository: https://github.com/8enSmith/mcp-open-library
Website: https://github.com/8enSmith/mcp-open-library#readme
Registry: active, updated 2026-10-22 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.61×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
search_books	875	544	37 %
get_book_by_title	388	241	16 %
get_authors_by_name	309	192	13 %
get_book_cover	298	185	13 %
get_book_by_id	191	119	8 %

Other registry entries on npmjs.com, the ones next to this name; all of them.

Servers that mention library.

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.