Get Weather Forecast

Instructions

Implementation Reference

• src/tools/weather.ts:207-253 (handler)

  The async handler function for the get_weather_forecast tool. Validates input (requires lat+lon or zip), calls the Verilex API at /api/v1/weather/forecast via apiGet, handles 404/error responses, and returns the forecast data as JSON.

  async ({ lat, lon, zip }) => {
    if (!zip && (lat === undefined || lon === undefined)) {
      return {
        content: [
          {
            type: "text" as const,
            text: "Please provide either lat+lon or a ZIP code.",
          },
        ],
        isError: true,
      };
    }
  
    const res = await apiGet<WeatherResponse>("/api/v1/weather/forecast", {
      lat,
      lon,
      zip,
    });
  
    if (!res.ok) {
      if (res.status === 404) {
        return {
          content: [
            {
              type: "text" as const,
              text: "Weather dataset is not yet available. This data source is coming soon.",
            },
          ],
        };
      }
      return {
        content: [
          {
            type: "text" as const,
            text: `API error (${res.status}): ${JSON.stringify(res.data)}`,
          },
        ],
        isError: true,
      };
    }
  
    return {
      content: [
        { type: "text" as const, text: JSON.stringify(res.data, null, 2) },
      ],
    };
  },

• src/tools/weather.ts:195-206 (schema)

  Input schema for get_weather_forecast: lat (optional number -90 to 90), lon (optional number -180 to 180), zip (optional string). Title and description metadata for the tool.

  {
    title: "Get Weather Forecast",
    description:
      "Get weather forecast for a location, up to 16 days ahead. Returns hourly " +
      "or daily forecast data including temperature, humidity, wind, and precipitation " +
      "probability. Source: NOAA GFS model. Note: This dataset is coming soon.",
    inputSchema: {
      lat: z.number().min(-90).max(90).optional().describe("Latitude"),
      lon: z.number().min(-180).max(180).optional().describe("Longitude"),
      zip: z.string().optional().describe("US 5-digit ZIP code"),
    },
  },

• src/tools/weather.ts:193-254 (registration)

  Registration of get_weather_forecast via server.registerTool() within the registerWeatherTools function (called from src/index.ts line 42).

  server.registerTool(
    "get_weather_forecast",
    {
      title: "Get Weather Forecast",
      description:
        "Get weather forecast for a location, up to 16 days ahead. Returns hourly " +
        "or daily forecast data including temperature, humidity, wind, and precipitation " +
        "probability. Source: NOAA GFS model. Note: This dataset is coming soon.",
      inputSchema: {
        lat: z.number().min(-90).max(90).optional().describe("Latitude"),
        lon: z.number().min(-180).max(180).optional().describe("Longitude"),
        zip: z.string().optional().describe("US 5-digit ZIP code"),
      },
    },
    async ({ lat, lon, zip }) => {
      if (!zip && (lat === undefined || lon === undefined)) {
        return {
          content: [
            {
              type: "text" as const,
              text: "Please provide either lat+lon or a ZIP code.",
            },
          ],
          isError: true,
        };
      }
  
      const res = await apiGet<WeatherResponse>("/api/v1/weather/forecast", {
        lat,
        lon,
        zip,
      });
  
      if (!res.ok) {
        if (res.status === 404) {
          return {
            content: [
              {
                type: "text" as const,
                text: "Weather dataset is not yet available. This data source is coming soon.",
              },
            ],
          };
        }
        return {
          content: [
            {
              type: "text" as const,
              text: `API error (${res.status}): ${JSON.stringify(res.data)}`,
            },
          ],
          isError: true,
        };
      }
  
      return {
        content: [
          { type: "text" as const, text: JSON.stringify(res.data, null, 2) },
        ],
      };
    },
  );

• src/index.ts:33-61 (registration)

  The createMcpServer function that instantiates McpServer and calls registerWeatherTools(server) on line 42, which registers the get_weather_forecast tool.

  function createMcpServer() {
    const server = new McpServer({
      name: "verilex-data",
      version: "0.3.3",
    });
  
    registerNpiTools(server);
    registerSecTools(server);
    registerPacerTools(server);
    registerWeatherTools(server);
    registerOtcTools(server);
    registerTrademarkTools(server);
    registerPatentTools(server);
    registerCompanyTools(server);
    registerCryptoTools(server);
    registerSanctionsTools(server);
    registerWhaleTools(server);
    registerLabelTools(server);
    registerHolderTools(server);
    registerDexTools(server);
    registerContractTools(server);
    registerPmTools(server);
    registerPmArbTools(server);
    registerPmResolutionTools(server);
    registerEconTools(server);
    registerPmMicroTools(server);
  
    return server;
  }

• src/client.ts:44-76 (helper)

  The apiGet helper function used by the handler to make the HTTP GET request to the Verilex API.

  export async function apiGet<T = unknown>(
    path: string,
    params?: Record<string, string | number | undefined>,
  ): Promise<ApiResponse<T>> {
    const url = buildUrl(path, params);
  
    const headers: Record<string, string> = {
      Accept: "application/json",
      "User-Agent": "verilex-mcp-server/0.1.0",
    };
  
    // Forward x402 payment token if present in env (for paid endpoints)
    const paymentToken = process.env.VERILEX_PAYMENT_TOKEN;
    if (paymentToken) {
      headers["X-Payment-Token"] = paymentToken;
    }
  
    const res = await fetch(url, { headers });
    const data = (await res.json()) as T;
  
    const stale = res.headers.get("X-Data-Stale");
    const lastUpdated = res.headers.get("X-Data-Last-Updated");
    const ageSeconds = res.headers.get("X-Data-Age-Seconds");
  
    return {
      ok: res.ok,
      status: res.status,
      data,
      stale: stale === "true",
      lastUpdated: lastUpdated ?? undefined,
      ageSeconds: ageSeconds ? Number(ageSeconds) : undefined,
    };
  }