Scored across 7 tools
Most tools are clearly separated by resource and action, but get_book_by_title overlaps heavily with search_books since it returns the same result structure and is essentially a subset of the general search. The book/author detail and cover/photo tools are unambiguous.
Naming mostly follows a consistent get_<resource>_by_<qualifier> pattern, e.g. get_book_by_id, get_book_by_title, get_author_photo. search_books breaks the get_ convention but remains readable and predictable alongside the others.
Seven tools is well-scoped for a read-only Open Library server. Each tool addresses a distinct lookup need without the collection feeling bloated or thin.
The surface covers general book search, book lookup by ID/title, author search, author details, author photos, and book covers. Minor gaps exist, such as no direct endpoint for works or edition lists beyond indirection through edition_key, but core reading workflows are covered.