mcp-swiss

Instructions

Implementation Reference

• src/modules/traffic.ts:183-213 (handler)

  The handler logic for 'get_traffic_nearby' which converts coordinates to LV95 and queries the ASTRA API.

  case "get_traffic_nearby": {
    const lat = args.lat as number;
    const lon = args.lon as number;
    const radius = (args.radius as number | undefined) ?? 5000;
  
    const [e, n] = wgs84ToLv95(lat, lon);
  
    // Build a map extent around the point using the radius
    const extentPadding = radius * 3;
    const mapExtent = `${e - extentPadding},${n - extentPadding},${e + extentPadding},${n + extentPadding}`;
  
    const url = buildUrl(`${GEO_ADMIN}/identify`, {
      geometry: `${e},${n}`,
      geometryType: "esriGeometryPoint",
      tolerance: radius,
      mapExtent,
      imageDisplay: "1,1,96",
      layers: `all:${TRAFFIC_LAYER}`,
      returnGeometry: false,
    });
    const data = await fetchJSON<IdentifyResponse>(url);
    const stations = data.results.map(slimTrafficStation);
    return JSON.stringify({
      count: stations.length,
      lat,
      lon,
      radius_m: radius,
      stations,
      source: "ASTRA — Federal Roads Office (Bundesamt für Strassen)",
    });
  }

• src/modules/traffic.ts:118-139 (schema)

  The MCP tool definition and input schema for 'get_traffic_nearby'.

    name: "get_traffic_nearby",
    description:
      "Find ASTRA traffic counting stations near a geographic coordinate in Switzerland. Returns nearby stations with traffic volume data.",
    inputSchema: {
      type: "object",
      required: ["lat", "lon"],
      properties: {
        lat: {
          type: "number",
          description: "Latitude in WGS84 (e.g. 47.3769 for Zürich)",
        },
        lon: {
          type: "number",
          description: "Longitude in WGS84 (e.g. 8.5417 for Zürich)",
        },
        radius: {
          type: "number",
          description: "Search radius in meters (default: 5000)",
        },
      },
    },
  },