This server has significant definition quality gaps. Of 6 tools, one (additionTool) is completely undocumented. Tool names are inconsistent: most end with 'Tool' suffix which is redundant in an MCP context. Descriptions range from adequate (getBooksTool: 62 chars) to sparse (getCartCountTool: 59 chars). Most critically, tools with no input parameters (getBooksTool, getCartItemsTool, getCartCountTool) have empty schemas but acceptable descriptions. The addProductToCartTool shows good parameter-level documentation with nullable and positional constraints, but additionTool's source is completely absent, preventing evaluation. Error handling is present in all tools but generic ('Failed to X'). No parameter descriptions mention valid ranges, formats, or dependencies. Output schemas are not documented, callers cannot know what fields to expect from getBooksWithAuthors() or cartRepository.getBookVariants().

• Remove 'Tool' suffix from all tool names: getBooksTool → getBooks, addProductToCartTool → addProductToCart, etc.
• Document output schema for each tool using JSON Schema or prose. Specify: getBooks returns array of {id, title, authorId, authorName}, getBookVariants returns array of {id, bookId, format, price, stock}, getCartItems returns array of {productId, quantity, price, subtotal}.
• Add pagination support: getBooks(limit=20, offset=0) and getBookVariants(limit=20, offset=0). Document that 'all' results are capped at 50 items; use offset to fetch more.
• Clarify cart identity model: getCartItems and getCartCountTool should either (a) accept userId/anonymousId parameters, or (b) document how the server determines 'current cart' from context.
• Enhance error messages with recovery guidance. E.g., 'Book not found with ID: abc. Try getBooks() to see available IDs.'
• Add format and constraint descriptions to parameters. E.g., bookId: 'UUID v4 format, e.g. 550e8400-e29b-41d4-a716-446655440000'.
• Document additionTool: provide source file, description, schema, and handler. Or remove if unused.
• Consider adding optional parameters to simplify common cases: getBooks(authorId?: string) to filter by author without requiring a full variant search.
• Return structured JSON objects, not JSON.stringify() strings. Clients expect parsed objects so they can chain results into downstream tool calls.
• Add tool annotations (readOnlyHint for getBooks/getBookVariants, destructiveHint for addProductToCart if it can be undone).