SommelierX demonstrates solid tool definition quality with complete schemas, clear descriptions, and consistent parameter typing across all 7 tools. All tools have descriptions (194-250 chars, within baseline 34-392 range), input schemas with typed parameters, and language support. However, output schemas are not documented, responses are returned as plain text rather than structured objects. Error handling lacks recovery guidance and categorization. Tool names follow verb_noun convention well (pair_*, search_*, find_*, group_*). No tool annotations (readOnlyHint, destructiveHint) despite all being read-only operations. Missing per-item success/failure for batch operations and no pagination support despite search tools that could return large result sets.

• Define and return structured output schemas for all tools. Instead of plain text, return JSON objects with typed fields (e.g., { wines: [{ name, score, region }], total_matches: N }). Document the schema in tool descriptions.
• Add readOnlyHint: true to all tool definitions via server.tool() annotations to signal safety and enable client-side caching optimizations.
• Implement pagination for search_ingredients and search_meals: add limit (1-100, default 20) and offset parameters; return total_count and next_offset in response.
• Enhance error handling: categorize errors as retryable (network timeout, rate limit) vs user-fixable (invalid ingredient, meal not found) vs fatal (auth failure). Return actionable guidance: 'Ingredient "xyz" not found. Try search_ingredients("mushroom") to discover available options.'
• Move pricing and auth metadata out of tool descriptions into server-level documentation or capability metadata. Keep descriptions focused on WHAT the tool does and WHEN to use it (10-200 chars).