mcp-nordic

Instructions

Implementation Reference

• src/servers/finnish-weather.js:118-144 (handler)

  The handler function for `fi_current_weather` tool which fetches and formats weather data.

  async ({ location }) => {
    try {
      const loc = await getLocation(location);
      const data = await openMeteoFetch({
        latitude: loc.lat,
        longitude: loc.lon,
        current: "temperature_2m,relative_humidity_2m,apparent_temperature,precipitation,weather_code,wind_speed_10m,wind_direction_10m,wind_gusts_10m,surface_pressure,cloud_cover,snowfall",
      });
      const c = data.current;
      const weather = WMO_CODES[c.weather_code] || `Code ${c.weather_code}`;
      const lines = [
        `## ${loc.name} — Current Weather`,
        `**Conditions:** ${weather}`,
        `**Temperature:** ${c.temperature_2m}°C (feels like ${c.apparent_temperature}°C)`,
        `**Humidity:** ${c.relative_humidity_2m}%`,
        `**Wind:** ${c.wind_speed_10m} km/h from ${c.wind_direction_10m}° (gusts ${c.wind_gusts_10m} km/h)`,
        `**Pressure:** ${c.surface_pressure} hPa`,
        `**Cloud cover:** ${c.cloud_cover}%`,
        `**Precipitation:** ${c.precipitation} mm`,
        c.snowfall > 0 ? `**Snowfall:** ${c.snowfall} cm` : null,
        `\n*Open-Meteo — ${c.time} (Europe/Helsinki)*`,
      ].filter(Boolean);
      return { content: [{ type: "text", text: lines.join("\n") }] };
    } catch (err) {
      return { content: [{ type: "text", text: `Error: ${err.message}` }], isError: true };
    }
  }

• src/servers/finnish-weather.js:112-117 (registration)

  Registration of the `fi_current_weather` tool.

  server.tool(
    "fi_current_weather",
    "Get current weather conditions for a location in Finland. Includes temperature, wind, precipitation, humidity, and cloud cover.",
    {
      location: z.string().describe("Finnish city name (e.g. 'Helsinki', 'Tampere', 'Rovaniemi', 'Levi') or lat,lon coordinates"),
    },