mcp-nordic

Instructions

Implementation Reference

• src/servers/danish-addresses.js:87-109 (handler)

  The handler for the 'dk_postal_code_lookup' tool, which fetches postal code data from the DAWA API and formats it into a text response.

  server.tool(
    "dk_postal_code_lookup",
    "Look up a Danish postal code to get the city/area name, bounding box, and associated municipalities.",
    {
      postal_code: z.string().regex(/^\d{4}$/).describe("4-digit Danish postal code, e.g. '2200'"),
    },
    async ({ postal_code }) => {
      try {
        const data = await dawaFetch(`/postnumre/${postal_code}`);
        const lines = [];
        lines.push(`## ${data.nr} ${data.navn}`);
        if (data.bbox) {
          lines.push(`**Bounding box:** ${data.bbox[1].toFixed(4)}°N to ${data.bbox[3].toFixed(4)}°N, ${data.bbox[0].toFixed(4)}°E to ${data.bbox[2].toFixed(4)}°E`);
        }
        if (data.kommuner && data.kommuner.length) {
          lines.push(`**Municipalities:** ${data.kommuner.map(k => `${k.navn} (${k.kode})`).join(", ")}`);
        }
        return { content: [{ type: "text", text: lines.join("\n") }] };
      } catch (err) {
        return { content: [{ type: "text", text: `Error: ${err.message}` }], isError: true };
      }
    }
  );