Server defines 4 tools with explicit schemas visible in src/index.ts. All tools have descriptions (10-105 chars avg ~68 chars). Schemas are present and mostly complete with typed properties. However, several parameters lack descriptions, output schemas are not documented, and error handling is minimal. Tool names follow verb_noun convention appropriately. The implementation is basic but functional.

• Document output schemas for all tools. Add a 'Response Format' section to each tool description describing the structure: e.g., get_bookshelf returns {totalBooks: int, unreadBooks: int, readingBooks: int, finishedBooks: int, categories: [{name: string, count: int}], ...}
• Expand parameter descriptions to include constraints and examples. E.g., highlight_style: 'Highlight style ID to filter by (null=all styles, valid IDs: 1=yellow, 2=blue, 3=green)' instead of just 'Highlight style filter'.
• Add error handling guidance in tool descriptions. E.g., search_books: '...Returns empty array if no matches found. If book_id is invalid, call get_bookshelf first to verify available books.'
• Split get_book_notes_and_highlights into two tools: get_book_highlights and get_book_notes. This aligns with pattern:tool (one responsibility per tool) and lets agents compose them independently.
• Define result limits explicitly. E.g., get_bookshelf: 'Returns all books in shelf (typically 10 - 500). For pagination, implement offset/limit params.' get_book_notes_and_highlights: 'Capped at 1000 highlights per call; use organize_by_chapter=true to reduce token count.'
• Add validation logic to catch and report invalid book_id values early. Return 'Book ID "XYZ" not found. Available books: [list]' instead of a generic error.
• Document default behaviors clearly. E.g., search_books: '...Defaults: exact_match=false (fuzzy matching), include_details=true (return full book info), max_results=5 (safety limit).'
• Consider adding a discover_books tool to help agents find books by category, author, or shelf status before calling search_books. This reduces failed lookups.