The server defines 7 tools with schemas and descriptions present, but quality is inconsistent. All tools have basic JSON Schema definitions with type and enum constraints where appropriate. However, descriptions are formulaic (all 8 - 16 characters in Korean), parameter descriptions lack actionable guidance, output schemas are completely undocumented, and error handling is absent. Tool naming follows verb_noun convention (register_, get_, search_, update_) which is correct, but parameter coverage and composition issues reduce overall quality. This is typical of a mediocre community server that has basic structure but lacks production-grade polish.

• Expand all tool descriptions to 50 - 200 characters (English equivalent). Example: 'register_user_skin_info' → 'Register a user's skin profile (type, concerns, age group). Use this first to personalize cosmetic recommendations. Returns user_id for future calls.' This guides the LLM on when and why to call it.
• Document output schemas for every tool. Example: get_cosmetic_recommendations returns [{product_id, name, brand, price, matching_ingredients: [string], recommendation_reason}]. List paginated results with total_count and next_cursor.
• Convert 'concerns' from free-form comma-separated string to an enum or array of enums. Define: ['acne', 'aging', 'brightening', 'hydration'] as the only valid values. Do the same for 'effect' in search_ingredients.
• Add result limit and pagination to search_products and search_ingredients. Define: limit (default 20, min 1, max 100), offset (default 0). Return total_count so the LLM knows if more results exist.
• Implement structured error responses. Example: if user_id not found, return {error: 'user_not_found', message: 'User 12345 not found. Try search_users() or register_user_skin_info() first.', suggestion: 'register_user_skin_info'}.
• Add parameter descriptions with constraints. Example: user_id → 'User ID (integer, > 0). Obtain from register_user_skin_info() or search_users().' ingredient → 'Optional. Specific ingredient name to filter results. If provided, returns only products containing this ingredient.'
• Ensure response objects include all IDs and references downstream tools need. If get_user_profile returns a user_id, update_user_profile should accept user_id. If search_products returns product_id, subsequent tools should accept product_id.