This MCP server has a single tool (getWeather) with critical definition quality issues. The tool name uses camelCase instead of the verb_noun convention, the description is in Chinese (non-English, limiting LLM accessibility), and while a basic input schema exists, it lacks comprehensive parameter documentation. The tool has no documented output schema, no error handling guidance, and no security considerations for the exposed API key. The implementation is a bare FastAPI endpoint that exposes a third-party weather API without proper abstraction or input validation.

• Rename 'getWeather' to 'get_weather' to follow verb_noun convention and improve LLM parsing.
• Translate tool description and parameter descriptions to English: 'Get current weather for a city. Returns temperature, humidity, wind conditions, and weather description.' Parameter 'city': 'City name (e.g., Beijing, Suzhou). Chinese cities supported. 1-50 characters.'
• Document output schema: { city: string, temperature: number, unit: 'celsius'|'fahrenheit', humidity: number, weather: string, wind_direction: string, wind_power: integer }
• Move API key to environment variable: JUHE_API_KEY = os.environ.get('JUHE_API_KEY'). Document setup in README with instructions to set via Docker secrets or .env.
• Enhance error messages with recovery guidance: 'City not found. Available cities: Beijing, Shanghai, Suzhou. Try a pinyin spelling or check the city name.' For API failures: 'Weather service temporarily unavailable. Retry in 30 seconds or check your internet connection.'
• Add input validation: Reject city strings <1 or >50 chars; reject non-alphanumeric + space characters with clear error 'City name must be 1-50 alphanumeric characters.'
• Return temperature as numeric value with separate unit field, not formatted string.
• Implement rate limiting (e.g., 10 calls per minute per IP) to prevent agent-driven quota exhaustion.
• Add a dry-run or 'validate_city' parameter to allow agents to check if a city is supported before making the full call.
• Document WHEN to use this tool: 'Call this tool to retrieve current weather conditions for a specific city. Use before suggesting outdoor activities or travel plans.'