This server has 4 tools with basic definitions but significant quality gaps. Tool names follow the verb-noun convention (list_, search_, get_), which is good. However, input schemas are largely missing type information beyond basic strings, parameter descriptions are minimal or absent, and output schemas are not documented. The server exposes API keys in environment variables (correct pattern) but lacks structured output documentation and comprehensive error guidance. Baseline comparison: average tool definition quality across 549 production tools shows 18-char names (this server averages 16 chars, acceptable), but 100% of A+ tools have documented return types (this server has none) and 100% have param descriptions (this server lacks them on most params). The descriptions present are moderately informative but fall short of LLM-optimized 50-200 char guidance. No tool annotations (readOnlyHint, destructiveHint) despite all being READ_ONLY. All tools interact with an external API but lack detailed error recovery guidance.

• Add explicit output schema documentation to each tool. Example for search_route: 'Returns a structured array of route objects, each with fields: route_number (string), departure_time (ISO 8601), arrival_time (ISO 8601), duration_minutes (int), delay_seconds (int), status (enum: on_time|delayed|cancelled), platform (string), stops_between (int), agency (string), transport_mode (enum: tram|subway|train|bus|ferry).'
• Refactor search_route to return JSON array of structured objects instead of formatted strings. This allows agents to filter, aggregate, and pass data to downstream tools without parsing.
• Add parameter validation descriptions: 'origin must be a valid stop name (e.g., Malmö Centralstation) or 9-digit stop ID (e.g., 740000003). Call search_stops first if unsure.'
• Document error paths with recovery guidance in each tool description. Example: 'If origin/destination cannot be resolved, error will list 'Could not resolve stations'. Try search_stops(name) to find the correct ID.' Reference the search_stops tool explicitly.
• Declare readOnlyHint: true for all tools in their registration metadata, enabling LLM optimizations for caching and safe retry.
• Add enum constraints for transport_mode in search_route output: ['Tram', 'Subway', 'Train', 'Bus', 'Ferry', 'Vehicle'] to prevent hallucinated values.
• Expand get_timetable description to explain pagination: 'Returns next 10 departures from the stop. Call multiple times with a future datetime to paginate results. No offset/limit parameters provided; filtering is time-based.'