Single-tool server with minimal definition quality. Tool has a basic description but critically lacks parameter type information in the visible schema. The input schema shows 'region_name' with only type 'string' and description 'Name of the region to get weather for', but no constraints, format specifications, or guidance on valid values. No output schema is documented. Error handling is present in the implementation but not reflected in tool metadata. The tool definition meets only bare-minimum criteria.

• Document the output schema with example structure: '{"current_condition": {...}, "weather": [...], "nearest_area": [...]}' or reduce response to essential fields (temperature, condition, humidity, wind_speed) to avoid context bloat.
• Add enum or regex pattern for region_name. If using wttr.in, document that it accepts city names (e.g., 'London', 'New York') and ISO country codes (e.g., 'GB', 'US'). Example: 'region_name (string, 1-50 chars): City name or country code. Examples: London, Paris, Tokyo, GB'.
• Extend tool description to 100-150 chars with actionable context: 'Get current weather conditions for a city or region using the wttr.in service. Supports city names and country codes. Call this when the user asks for weather, forecast, or climate information.'
• Document error scenarios: 'Returns {"error": "..."} if the region is not found or the wttr.in service is unavailable. If region is unknown, suggest similar region names from the error response.'
• Implement result truncation or summarization in the tool to cap response size. Wttr.in returns verbose JSON; consider extracting current_condition only or returning a formatted summary string rather than the full API response.

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

• Relies on Stateful initialize / Mcp-Session-Id (removed; protocol is stateless) - make each request self-contained