Server provides 3 tools with basic structure but several definition gaps. All tools have clear verb-based names (add, subtract, get_weather) following Arcade patterns. Tool descriptions are present but minimal (10-40 chars), falling short of the 50-200 char guideline for LLM-optimized descriptions. Input schemas are properly typed (integer, string) with parameter descriptions present, meeting baseline schema requirements. However, output schemas lack documentation, get_weather returns a WeatherData object but the response structure is not explicitly documented in the tool definition. No error handling guidance, no parameter constraints (enums, ranges), and no indication of idempotency or destructiveness. Tool composition is simple and appropriate for a demo server.

• Expand tool descriptions to 50-200 characters. Example for add: 'Add two integers together and return the sum. Use this when you need to perform arithmetic addition on numeric values. Returns an integer.'
• Document the output schema for get_weather explicitly. Include the response structure: {location: string, temperature: string (format '##°C'), condition: string}. This enables LLMs to extract and reuse values in subsequent calls.
• Add parameter constraints: document that add/subtract accept integers (suggest -999999 to 999999 range or 'any valid 32-bit integer'). For get_weather location, specify format: 'City name (e.g., London, Tokyo) or city, country (e.g., London, UK)'.
• Add error handling guidance to tool descriptions. E.g., for get_weather: 'Returns mock weather data for any location. If location is empty, returns an error with message requesting a valid location name.'
• Adopt tool annotations in FastMCP using readOnlyHint=true for all three tools to signal to clients that they are safe to call repeatedly without side effects.
• Consider adding a new tool that demonstrates error handling and validation (e.g., divide with explicit error on division by zero) to guide agents on proper recovery patterns.

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

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