Two tools with basic verb-noun naming (get_coordinates, get_forecast) and present descriptions. However, input schemas lack parameter descriptions entirely, the JSON Schema shows only type and description at tool level, not per-parameter. Output schemas are undocumented. Error handling returns generic text ('Unable to resolve coordinates') without recovery guidance. No tool annotations (readOnlyHint, idempotentHint). Descriptions are adequate (60 - 80 chars) but lack WHEN/WHY context. Per-parameter descriptions are completely absent, violating pattern:tool-description. This is a D-grade server with incomplete schema documentation.

• Add per-parameter descriptions to both tools. For get_coordinates, describe 'query' as 'Japanese location name (e.g., Tokyo, Shibuya, Chiyoda Ward). Accepts city, ward, or landmark names.' For get_forecast, describe 'latitude' and 'longitude' as 'Geographic coordinates in decimal degrees (e.g., 35.6762, 139.6503 for Tokyo). Range: ±90 for latitude, ±180 for longitude.'
• Document output schemas. Specify that get_coordinates returns an array of objects with fields: name (string), latitude (number), longitude (number), country_code (string). Specify that get_forecast returns an object with daily forecast periods, each containing: date (ISO 8601), weather_description (string), temperature_max (number), temperature_min (number), precipitation_probability (number), wind_speed (number).
• Replace generic error messages with actionable recovery guidance. E.g., 'Location "Xyz" not found in Japan. Try: (1) Check spelling (e.g., "Tokyo" not "Tokio"), (2) Use a broader area name (e.g., "Kanto" instead of a small ward), (3) Call get_coordinates with a different query.'
• Add tool annotations. Mark both tools with readOnlyHint=true and idempotentHint=true in the mcp.Tool struct to signal they are safe to retry and do not modify state.
• Enhance tool descriptions with WHEN/WHY context. E.g., 'Call this first to convert a user-provided location name (e.g., "Tokyo") into coordinates needed by get_forecast. Supports Japanese city, ward, and landmark names via Open-Meteo geocoding.'