Outfit Weather

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What it does

Ask ChatGPT "What should I wear tomorrow in Bishkek?" and Outfit Weather:

• looks at the whole day from 07:00 to 21:00, not just one number,
• uses temperature, feels-like, rain, snow and wind,
• averages three weather models (ECMWF, ICON and GFS) from Open-Meteo,
• answers with a short text and a neon card: top, bottom, shoes, what to take, and warnings like "cold morning, warm afternoon" or "rain from 16:00".

Free, no account, no tracking.

Try it in ChatGPT

1. In ChatGPT open Settings → Plugins, press +, then Add custom MCP server.
2. Connection: Server URL https://outfit-weather.onrender.com/mcp
3. Authentication: No authentication, then Create.
4. In a new chat turn on Outfit Weather and ask what to wear.

The server sleeps when nobody uses it, so the very first answer can take up to a minute.

How it works

ChatGPT ──MCP──▶ Node.js server on Render ──▶ Cloudflare Worker ──▶ Open-Meteo
   ▲                     │  (geocoding + 3-model forecast)
   └── text + card ◀─────┘

• MCP server (src/server.js): one tool, outfit_today(city, day), over stateless Streamable HTTP. It also serves the website and the icon.
• Weather logic (src/weather.js): pure functions (no network), so they are tested without the internet. Averages the models, picks the hours of the day, and turns them into outfit advice.
• Card (src/widget/outfit-card.html): one HTML file shown inside ChatGPT, using the open MCP Apps standard. It follows ChatGPT's light or dark theme.
• Cloudflare Worker (worker/): Render shares its internet address with many apps, which kept hitting Open-Meteo's daily limit. The Worker asks Open-Meteo from Cloudflare's network instead, protected by a secret key.
• Cache (src/cache.js): cities are remembered for a day, forecasts for 30 minutes (and up to 3 hours if Open-Meteo is unavailable).
• Website (site/): home page with a live example card, privacy policy, terms and support.
• Plugin package (plugin/): the manifest with the icon, links and review test cases for the ChatGPT directory.

Run it yourself

Needs Node.js 24.

npm install
npm test          # weather logic and cache tests
npm start         # http://localhost:3000 (MCP endpoint: /mcp)
npm run inspect   # opens MCP Inspector to call the tool by hand

Optional environment variables:

Name	What it does
PORT	Port to listen on (Render sets it)
OPEN_METEO_PROXY_URL	Cloudflare Worker address; empty string = call Open-Meteo directly
OPEN_METEO_PROXY_KEY	Secret key for the Worker
SUPPORT_EMAIL	Email shown on the website

Built with

Node.js · MCP TypeScript SDK · zod · Open-Meteo · Render · Cloudflare Workers

About

My third project on the way to becoming a developer. Earlier ones: Neon Armada (Battleship game) and Neon Weather (weather web app, whose forecast logic grew into this plugin).

Weather data by Open-Meteo.com (CC BY 4.0).