Tabelog Explorer demonstrates solid tool design with clear naming, comprehensive parameter descriptions, and well-documented schemas. All 8 tools follow verb_noun conventions (search_, get_, list_). Descriptions are detailed (150-400 chars) and include context about Tabelog's rating system and when to use batch vs. individual methods. Input schemas are complete with types and descriptions for all parameters. However, output schemas are documented only in docstrings, not as formal JSON Schema. Error handling is minimal, no recovery guidance or actionable error messages. The batch tools (get_restaurant_info_batch, get_reviews_batch) are excellent composition patterns, reducing N+1 call problems. Parameter constraints are well-specified (enums for sort/meal_type, ranges for price tiers, filter options). One minor issue: search_restaurants has many optional parameters (10 total), which could benefit from smart defaults to reduce agent reasoning.

• Add formal JSON Schema output definitions to each tool's schema property (not just docstrings). Example: search_restaurants should declare output as array of {id: string, name: string, rating: number, url: string, ...}.
• Implement error recovery guidance. When get_areas fails, return 'Invalid region. Valid regions: tokyo, osaka, kyoto, fukuoka, hokkaido, aichi, kanagawa'. When search_restaurants returns 0 results, suggest 'No results. Try broadening filters: remove genre, increase price_max, or use get_areas() to explore neighborhoods.'
• Add per-item error reporting to batch tools. Return {restaurant_id, success: bool, data: {...}, error: string} for each item so agents can retry only failed items.
• Provide smart defaults: meal_type defaults to 'dinner' (most common), sort defaults to 'trend', limit defaults to 20. Document that price filters require meal_type only if both are specified.
• Add a translate_reviews tool or document that reviews are in Japanese and require external translation. Alternatively, add an optional 'translate' parameter to get_reviews/get_reviews_batch that calls a translation service.