Three tools with basic schemas and descriptions, but significant gaps in parameter documentation and output schema clarity. Tool names follow verb_noun convention (search_books, get_libraries_*), which is good. However, descriptions are minimal (34-72 chars, below the 194-char baseline), and critical parameters lack descriptions. The 'query' parameter in search_books has no description. Prefecture and city parameters have examples but no format constraints or validation guidance. No output schemas documented. Error handling returns JSON strings but lacks recovery guidance. Resources feature is declared but returns placeholder responses.

• Add a description to the 'query' parameter in search_books: 'Search term (title, author, ISBN, or keyword). If ISBN is provided, query is ignored.'
• Document output schemas for all three tools. Example for search_books: {type: 'object', properties: {isbn: {type: 'string'}, libraries: {type: 'array', items: {type: 'object', properties: {name: {type: 'string'}, availability: {type: 'boolean'}}}}}}
• Replace free-form prefecture/city strings with enum constraints or a discovery tool (list_prefectures, list_cities_by_prefecture) to guide LLM input.
• Expand tool descriptions to 100 - 200 characters. Example: 'Search for books in a specific city library system. Requires prefecture and city names in Japanese. Returns availability across libraries in that city.'
• Enhance error messages with recovery guidance: 'Prefecture required (e.g., 東京都). Call get_libraries_by_prefecture first to see available prefectures.' instead of bare 'Prefecture and city parameters are required'.

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry