List of all books in the library: id, author, title, chapter count, token count, quality status.

Table of contents for a book by its id: chapter number, title, token count, and a short summary for each chapter.

Full-text search across chapters and book titles/authors in the whole library (bm25 ranking, snippets, RU/EN stemming). The book_id parameter restricts the search to one book.

Chapter text of a book: by chapter numbers (spec, e.g. "1-3,5") or by token budget (budget). If neither spec nor budget is given, the default budget of 12000 tokens is used. Passing both parameters at once is an error. If even the first chapter doesn't fit the budget, an empty text with an explanation in message is returned instead of an error — retry with a larger budget or use spec.

Metadata and quality metrics for a book: book, metrics, subscores, score, hard_triggers — the same projection as lib info.

Verify a quote against the library: an exact/close/distorted/not_found verdict, the book/chapter location, similarity, a passage of surrounding text, and a word-level diff against the source. Provide book_id to check one specific book (full scan, no FTS5 needed); omit it to search the whole library via FTS5 candidates. Use this whenever you quote a book to the user.