Openlibrary MCP Server is answering right now. Last checked 13 min ago. 125 installs a week from npm. It exposes 10 tools. Last commit 25 Aug 2026.
Search books and authors, fetch editions, browse subjects, and resolve cover images.
Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 25 August 2026. No other catalogue keeps this.
Today is the operative word: we check Openlibrary MCP Server every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 13 min ago.
claude mcp add openlibrary-mcp-server --transport http https://openlibrary.caseyjhand.com/mcp
{
"mcpServers": {
"openlibrary-mcp-server": {
"url": "https://openlibrary.caseyjhand.com/mcp"
}
}
}
[mcp_servers.openlibrary-mcp-server]
url = "https://openlibrary.caseyjhand.com/mcp"
{
"mcpServers": {
"openlibrary-mcp-server": {
"url": "https://openlibrary.caseyjhand.com/mcp"
}
}
}
{
"mcpServers": {
"openlibrary-mcp-server": {
"url": "https://openlibrary.caseyjhand.com/mcp"
}
}
}
This one needs environment variables set before it will start:
MCP_HTTP_HOST (The hostname for the HTTP server.), MCP_HTTP_PORT (The port to run the HTTP server on.), MCP_HTTP_ENDPOINT_PATH (The endpoint path for the MCP server.), MCP_PUBLIC_URL (Public origin override for deployments behind a TLS-terminating reverse proxy (e.g. https://mcp.example.com).), MCP_AUTH_MODE (Authentication mode to use: 'none', 'jwt', or 'oauth'.), MCP_LOG_LEVEL (Sets the minimum log level for output (e.g., 'debug', 'info', 'warn').).
The author declared them in the registry entry; get the values from the project itself.
Read directly from the server with tools/list, grouped by what they act on.
If a tool disappears, we record the date.
openlibrary_get_author
openlibrary_get_author_works
openlibrary_get_cover_url
openlibrary_get_edition
openlibrary_get_editions
openlibrary_get_subject
openlibrary_get_work
openlibrary_search_authors
openlibrary_search_books
openlibrary_search_inside
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://openlibrary.caseyjhand.com/mcp | streamable-http | answering | 394 ms | 13 min ago |
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Answers built from our own checks of this server.