devutils-mcp-server

Instructions

Implementation Reference

• src/tools/encoding.ts:126-144 (handler)

  Implementation of the hex_decode tool, which cleans the input string and uses Buffer to convert hex back to UTF-8.

  server.tool(
    "hex_decode",
    "Decode a hexadecimal string back to plain text.",
    { input: z.string().describe("The hex string to decode") },
    async ({ input }) => {
      try {
        const cleaned = input.replace(/\s/g, "").replace(/^0x/i, "");
        const decoded = Buffer.from(cleaned, "hex").toString("utf-8");
        return { content: [{ type: "text" as const, text: decoded }] };
      } catch {
        return {
          content: [
            { type: "text" as const, text: "Error: Invalid hex input" },
          ],
          isError: true,
        };
      }
    }
  );