Single tool with minimal definition quality. Tool name 'get_weather' follows verb_noun convention (+), but description is extremely brief (28 chars, below 34-char p10 baseline). Input schema present with proper Zod typing, but parameter description is generic ('city name for weather query'). No output schema documented. Error handling returns fallback random data instead of actionable guidance. Tool lacks idempotency hints, rate-limit warnings, and API dependency disclosure. No pagination despite external API calls. Composition is acceptable (single responsibility) but lacks production polish.

• Expand tool description to 100-150 chars: 'Fetch current weather and forecast for a city. Returns temperature, conditions, humidity, wind speed, and 1-day forecast. Supports city names (e.g. London, New York, Tokyo). Call this to answer weather questions or plan activities based on conditions.'
• Document output schema explicitly: {city: string, current_condition: {temperature: number, weatherDesc: string, humidity: number, windSpeed: number, observation_time: string}, forecast: {maxTemp: number, minTemp: number, sunHour: number, date: string}}
• Replace fallback random data with actionable error: 'Failed to fetch weather for {cityName}. Verify city name is valid (e.g. London, Paris). If error persists, the weather service may be unavailable, try again in 30 seconds.'
• Add parameter constraint to description: 'cityName: City name or major city abbreviation (e.g. London, NYC, LAX). Supports international cities. Max 100 characters.'
• Add tool description note: 'Uses wttr.in API (external service). Typical response time <2s. No rate limits enforced per call, but avoid >10 requests/minute for same city.'