Math Calculator MCP Server

Implementation Reference

• src/server.ts:17-31 (handler)

  Handler function that executes the arithmetic calculation based on the specified operation and parameters a and b, returning the result in MCP text content format or an error for division by zero.

  async ({ operation, a, b }) => {
    switch (operation) {
      case "add":
        return { content: [{ type: "text", text: String(a + b) }] };
      case "subtract":
        return { content: [{ type: "text", text: String(a - b) }] };
      case "multiply":
        return { content: [{ type: "text", text: String(a * b) }] };
      case "divide":
        if (b === 0) {
          return { isError: true, content: [{ type: "text", text: "Division by zero" }] };
        }
        return { content: [{ type: "text", text: String(a / b) }] };
    }
  }

• src/server.ts:12-16 (schema)

  Zod input schema defining the tool parameters: operation as one of add/subtract/multiply/divide, and numeric arguments a and b.

  {
    operation: z.enum(["add", "subtract", "multiply", "divide"]),
    a: z.number(),
    b: z.number(),
  },

• src/server.ts:10-32 (registration)

  Registration of the 'calculate' tool on the MCP server, specifying the name, input schema, and handler function.

  server.tool(
    "calculate",
    {
      operation: z.enum(["add", "subtract", "multiply", "divide"]),
      a: z.number(),
      b: z.number(),
    },
    async ({ operation, a, b }) => {
      switch (operation) {
        case "add":
          return { content: [{ type: "text", text: String(a + b) }] };
        case "subtract":
          return { content: [{ type: "text", text: String(a - b) }] };
        case "multiply":
          return { content: [{ type: "text", text: String(a * b) }] };
        case "divide":
          if (b === 0) {
            return { isError: true, content: [{ type: "text", text: "Division by zero" }] };
          }
          return { content: [{ type: "text", text: String(a / b) }] };
      }
    }
  );