Scavio MCP server demonstrates solid definition quality across 16 e-commerce and travel tools. All tools have descriptions and visible input schemas with type definitions. Tool names follow verb_noun convention (search_*, get_*). Descriptions are concrete and include critical operational details (pagination limits, credit costs, parameter constraints). However, several patterns from the 54 Agentic Tool Patterns are underutilized: output schemas are not formally documented in the provided source, tool annotations (readOnlyHint) are absent despite all tools being read-only, and some parameter relationships lack explicit documentation. Error handling via handleApiError() is present but focused on HTTP status codes rather than recovery guidance. The server represents above-average quality but falls short of A-grade (80+) due to incomplete schema documentation and missing tool annotations.

• Add formal output schema documentation for all 16 tools. For each tool, define the response structure, field names, types, and nested object schemas. Example: 'Returns object {results: [{id: string, name: string, price: number, url: string}], total_count: integer, next_cursor?: string}'.
• Annotate all read-only tools with readOnlyHint: true in the tool metadata. This enables clients to quickly categorize tools and makes agent behavior more transparent.
• For tools with conditional parameter requirements (checkin+checkout, slug on get_capterra_reviews), add explicit validation inside the tool handler. Return a clear error message if only one of a pair is provided: 'Both checkin and checkout are required; received only checkin.'
• Enhance error recovery in handleApiError(). For 404 errors, suggest: 'Resource not found. Verify the ID and try again.' For 429, suggest: 'Rate limited. Wait 60 seconds and retry.' For 402, include the billing URL (already done, good pattern).
• Expand get_amazon_options description to 100+ characters explaining that it returns supported marketplaces and country codes, and should be called first to understand available regions.
• Document per-tool credit costs consistently. Most tools state costs in descriptions (1 credit, 2 credits), but formalize this in a metadata field for easier cost modeling by agents.
• Add example usage or return-value hints in descriptions for complex tools like search_booking and search_airbnb, which have many optional filters. Help agents understand common invocation patterns.

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

• Relies on Dynamic Client Registration (deprecated) - use Client ID Metadata Documents (CIMD)