MCP Math Server

Instructions

Implementation Reference

• src/index.ts:66-73 (handler)

  The handler function for the 'subtract' tool. It takes inputs 'a' and 'b', computes their difference (a - b), and returns a structured text response containing the result.

  async ({ a, b }) => {
    const diff = a - b;
    return {
      content: [
        { type: "text", text: `The difference of ${a} and ${b} is ${diff}` }
      ]
    };
  }

• src/index.ts:64-64 (schema)

  The input schema for the 'subtract' tool, defining 'a' and 'b' as numbers using Zod validation.

  inputSchema: { a: z.number(), b: z.number() },

• src/index.ts:59-74 (registration)

  The registration of the 'subtract' tool on the MCP server, including name, metadata, schema, and handler function.

  server.registerTool(
    "subtract",
    {
      title: "Subtraction tool",
      description: "Subtract b from a (a - b)",
      inputSchema: { a: z.number(), b: z.number() },
    },
    async ({ a, b }) => {
      const diff = a - b;
      return {
        content: [
          { type: "text", text: `The difference of ${a} and ${b} is ${diff}` }
        ]
      };
    }
  );