Weather

Weather

Provide concise, location-specific weather answers from a live source.

Workflow

1. Resolve the location.

   • Use the city, region, country, or airport code named by the user.
   • If the user omits the location, use reliable location context only when it is clearly available; otherwise ask one short clarifying question.
   • If the location name is ambiguous, clarify unless the surrounding context makes one match clearly dominant.

2. Resolve the time window.

   • Use current conditions for "now" or "right now" questions.
   • Use the shortest forecast window that fits the request for hourly, daily, weekend, or trip-planning questions.
   • Translate relative dates such as "today," "tomorrow," and "this weekend" into exact dates in the answer.

3. Fetch the weather.

   • Use curl against wttr.in or another live weather source when shell access and curl are available.
   • Request only the days needed instead of a long default range.
   • Fall back to the built-in web_fetch tool when curl is unavailable or shell HTTP access is not practical.
   • If you cannot verify live conditions, say so instead of guessing.

4. Answer directly.

   • Lead with the headline result first.
   • Include precipitation risk for rain, snow, and outdoor-planning questions.
   • Include feels-like temperature, wind, humidity, or visibility only when relevant to the request.
   • Keep the answer brief unless the user asks for more detail.

Fetch Strategy

Primary shell path:

curl -s "wttr.in/Shanghai?format=3"
curl -s "wttr.in/Shanghai?format=j1"

Fallback web fetch path:

• Use the built-in web_fetch tool with:
• https://wttr.in/Shanghai?format=3
• https://wttr.in/Shanghai?format=j1

Use the same wttr.in URLs with web_fetch when curl is unavailable.

wttr.in Request Patterns

Current conditions:

curl -s "wttr.in/Shanghai?format=3"
curl -s "wttr.in/Shanghai?0"

Forecasts:

curl -s "wttr.in/Shanghai"
curl -s "wttr.in/Shanghai?format=v2"
curl -s "wttr.in/Shanghai?1"

Format options:

curl -s "wttr.in/Shanghai?format=%l:+%c+%t+%w"
curl -s "wttr.in/Shanghai?format=j1"

Useful format codes:

• %l location
• %c condition
• %t temperature
• %f feels like
• %w wind
• %h humidity
• %p precipitation

Common Request Shapes

• "What's the weather in Paris today?" -> Give a current summary and, if available, today's high and low.
• "Will it rain in Seattle tomorrow?" -> Focus on precipitation and include the exact date.
• "Weather for my trip to Tokyo this weekend" -> Summarize each day in the requested travel window.
• "Do I need a jacket tonight in Boston?" -> Translate the intent into practical temperature and wind guidance.

Guardrails

• Treat general weather data as convenience information, not emergency guidance.
• Redirect severe-weather or safety-critical questions to an official alerting authority.
• Do not use this skill for historical climatology, long-range climate trends, or specialized aviation or marine forecasting.
• Do not assume curl is installed; when it is missing, fall back to web_fetch.

Output Rules

• Use the user's preferred units when they are explicit.
• Otherwise follow locale or source defaults and avoid unnecessary conversions.
• Include at least one exact date when the user asks with relative time words.
• Mention source limitations briefly when the available data is incomplete or uncertain.