Single tool 'Weather by ACN' has a clear action verb and reasonable description (Spanish, ~80 chars). Input schema is visible with three parameters (location, days, details) all typed and described. However, critical gaps: (1) output schema is NOT documented, the code shows WeatherResponse interface but tool registration does not expose it to the LLM; (2) parameter descriptions lack constraints (days says '1-7' but no enum/min/max in schema); (3) no error handling guidance, processWeatherRequest returns error objects but tool definition does not explain recovery paths; (4) no tool annotations (readOnlyHint present via Risk: READ_ONLY in metadata, but not in schema); (5) description is in Spanish, limiting LLM understanding in English-first contexts. Baseline: 194 chars avg description (this is ~80), 4 params avg (this has 3, acceptable), 100% of A+ tools document output (this does not).

• Add explicit output schema to tool definition: document that response includes {location, elevation, currentWeather{temperature, windSpeed, windDirection, weatherCode, time}, forecast[{date, hours[{time, temperature, humidity, precipitation, windSpeed, windDirection}]}], error?, message?}
• Add min/max constraints to 'days' parameter in schema: {type: 'number', minimum: 1, maximum: 7, default: 1}
• Enhance error descriptions with recovery paths: 'If location not found, try search_locations() with partial name' or 'If API timeout, retry in 30 seconds'
• Translate tool description to English: 'Get weather forecast for a location (coordinates or city name). Returns current conditions and hourly forecast for 1-7 days.'
• Add tool annotations to schema: include readOnlyHint: true in tool definition so LLM knows this is safe to call repeatedly