ShelfClub MCP server

• Registry nameapp.shelfclub/booksverified in the MCP registry

The registry name sits under shelfclub.app. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

• Stateanswerschecked 2026-10-27
• Tools6
• Server calls itselfshelfclub
• Server version0.2.0
• Protocol version2025-06-18

On 2026-10-27 the server answered initialize and tools/list without a sign-in. First answer in 123 ms.

• Its tools do none of the product's use cases we checked: import a Goodreads or StoryGraph library with ratings; run a book club with polls and spoiler-tagged chat; track which friend has each lent book and when.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

• INITE MCP score72 of 100answers 100 · does the job 0 · definitions 97 · context 100 · connects 100
• What an agent can do with it0 of 3 use cases
• Answered100% of days9 of 9 daily checks
• Median first answer107 ms
• Space in an agent's context≈ 1,509 tokensthe definitions of all its tools (6), which an agent carries on every turn
• Tool definitionsA · 97 of 100
• Typed results6 of 6 toolsdeclared outputSchema: results come typed, read once

• Parameters without a description: in 1 of 6

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

• search_books

  Search the ShelfClub book catalog by title or author name. Returns up to 10 books, each with its ShelfClub id, authors, description, reader rating, series, shelfclub.app link, and mood, vibe, pace and genre tags (machine-generated, or…

• find_books_by_mood

  Find books in the ShelfClub catalog by mood, vibe, pace and genre tags. At least one tag is needed. Books that carry every requested tag are listed first, most read first; when there are fewer of those than asked for, books that carry…

• get_book

  Look up one book in the ShelfClub catalog, by its ShelfClub id or by ISBN. Returns its description, authors, reader rating, series, an edition (ISBN, page count, publisher, publication date, language), its shelfclub.app link, and its…

• get_similar_books

  List the books in the ShelfClub catalog whose mood, vibe, pace and genre tags overlap most with those of a given book, chosen from its 10,000 most-read books. The tags are machine-generated, or voted for by at least three readers of the…

• get_trending_books

  List the books trending on ShelfClub: the books its readers have been shelving come first, then the catalog's most widely read books. Returns up to 10 books, each with its ShelfClub id, authors, description, reader rating, series…

• get_author

  Look up an author in the ShelfClub catalog by ShelfClub author id, which get_book returns for the authors of a book. Returns the author's name, biography, birth and death dates and shelfclub.app link. With `include_books`, also returns up…