Single tool with reasonable naming and description, but several quality gaps. Tool name 'list_mcp_servers' correctly starts with a verb and is clear. Description is substantive (115 chars) and explains the primary function. However, parameter descriptions are present but somewhat generic, output schema is completely undocumented (critical gap), and error handling lacks recovery guidance. The tool returns raw JSON with minimal structure guidance for downstream agents. No parameter validation constraints are visible beyond basic type/URL validation, and the response includes verbose metadata that could be stripped for token efficiency. The tool is functional and correctly registered via the SDK, but lacks production-grade polish for error recovery and output documentation.

• Add explicit output schema documentation describing the structure of the returned object. Document that responses include 'servers' (array of server objects with fields like name, description, homepageUrl) and 'metadata' (object containing next_cursor for pagination). Example: 'Returns an object with servers array and metadata including next_cursor for pagination. Total servers in response is provided via countInfo text.'
• Enhance error handling to categorize failures and provide recovery guidance. Example: For HTTP 404 on invalid registry_url, return 'Registry not found at {url}. Verify registry_url is correct.' For HTTP 503, return 'Registry temporarily unavailable. Retry shortly or use default registry.' For connection timeouts, return 'Request timed out. Try again or reduce limit.'
• Document parameter constraints more explicitly. Add to 'limit' description: 'Results are paginated in groups up to this limit. Use cursor parameter to fetch subsequent pages.' Add to 'registry_url' description: 'Defaults to the official MCP Registry (registry.modelcontextprotocol.io). Custom registries must implement the same API contract.'
• Strip or summarize verbose metadata in responses. Consider returning only the 'servers' array plus a 'next_cursor' field at the top level, omitting internal registry metadata. Include a note in description: 'Returns minimal metadata to preserve token efficiency. Use next_cursor to request the next page.'
• Add tool annotation hint to indicate read-only safety. Modify tool registration to include readOnlyHint annotation so clients can mark this as safe for retry without side effects.