Server defines 4 tools with basic structure. All tools have descriptions (good), and input schemas are partially defined with parameter names and basic types. However, schemas lack formal type constraints, parameter descriptions are minimal or absent, output schemas are completely undocumented, and error handling provides no guidance. Tool names follow verb_noun convention (get_*) which is positive. The implementation shows dependency injection and logging infrastructure, but tool quality does not meet production baselines. Average tool score is 54, fair but with significant gaps in schema completeness and parameter documentation expected at higher tiers.

• Add formal output schema documentation for each tool. Example for get_current_weather: { temperature: number, humidity: number, wind_speed: number, condition: string, city: string, timestamp: string (ISO 8601), forecast_url?: string }. Documented output schemas enable tool chaining and reduce LLM guessing.
• Expand parameter descriptions to include format, constraints, and examples. For 'city': 'City name (e.g., "New York", "San Francisco"). Accepts English-language city names with 2-50 characters. Returns error if city not found with suggestions for similar cities.' For 'days': 'Number of days to forecast. Integer 1-5, default 3. Omit for default.'
• Add readOnlyHint to all tool definitions in WeatherMCPServer.ts setupHandlers(). Modify ListToolsRequestSchema handler to include { ..., readOnlyHint: true } for all tools.
• Enforce numeric constraints in JSON Schema. Use 'minimum', 'maximum', 'minLength', 'maxLength' in inputSchema. Example: { days: { type: 'integer', minimum: 1, maximum: 5, description: '...' } }.
• Implement discovery tool or documentation. Add a list_available_cities tool that returns paginated list of valid cities, or document in get_cache_statistics what cities are available.
• Add error recovery guidance in CallToolRequestSchema catch block. Parse error type and return actionable message: 'City "Lodnon" not found. Did you mean: London, Londonderry, Londonderry? Try searching with get_current_weather and a common city name.'
• Document pagination for get_weather_history. Add 'offset' and 'limit' parameters with defaults, and return { records: [...], total_count: number, has_more: boolean } to signal truncation.

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

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry