mcp-nordic

Instructions

Implementation Reference

• src/servers/norwegian-weather.js:108-144 (handler)

  The 'no_current_weather' tool is registered and implemented within the server.tool block in src/servers/norwegian-weather.js. It fetches weather data from the MET Norway API and formats it into a text response.

  server.tool(
    "no_current_weather",
    "Get current weather for a location in Norway using MET Norway (yr.no). Includes temperature, wind, precipitation, humidity, and cloud cover.",
    {
      location: z.string().describe("Norwegian city name (e.g. 'Oslo', 'Bergen', 'Tromsø', 'Lofoten') or lat,lon coordinates"),
    },
    async ({ location }) => {
      try {
        const loc = await getLocation(location);
        const data = await fetchForecast(loc.lat, loc.lon);
        const ts = data.properties.timeseries;
        if (!ts?.length) throw new Error("No forecast data available");
  
        const now = ts[0];
        const inst = now.data.instant.details;
        const symbol = now.data.next_1_hours?.summary?.symbol_code
          || now.data.next_6_hours?.summary?.symbol_code || "";
        const precip1h = now.data.next_1_hours?.details?.precipitation_amount;
  
        const lines = [
          `## ${loc.name} — Current Weather`,
          `**Conditions:** ${symbolToText(symbol)}`,
          `**Temperature:** ${inst.air_temperature}°C`,
          `**Humidity:** ${inst.relative_humidity}%`,
          `**Wind:** ${inst.wind_speed} m/s from ${inst.wind_from_direction}° (gusts ${inst.wind_speed_of_gust ?? "N/A"} m/s)`,
          `**Pressure:** ${inst.air_pressure_at_sea_level} hPa`,
          `**Cloud cover:** ${inst.cloud_area_fraction}%`,
          precip1h != null ? `**Precipitation (next hour):** ${precip1h} mm` : null,
          `\n*MET Norway Locationforecast 2.0 — ${now.time}*`,
        ].filter(Boolean);
  
        return { content: [{ type: "text", text: lines.join("\n") }] };
      } catch (err) {
        return { content: [{ type: "text", text: `Error: ${err.message}` }], isError: true };
      }
    }
  );