Calculator MCP Server

Instructions

Implementation Reference

• src/index.ts:210-232 (handler)

  Handler logic for the 'sqrt' tool: validates input number is non-negative, computes square root using Math.sqrt, and returns formatted result or error.

  case "sqrt": {
    const { number } = args as { number: number };
    if (number < 0) {
      return {
        content: [
          {
            type: "text",
            text: "Error: Cannot calculate square root of negative number",
          },
        ],
        isError: true,
      };
    }
    const result = Math.sqrt(number);
    return {
      content: [
        {
          type: "text",
          text: `√${number} = ${result}`,
        },
      ],
    };
  }

• src/index.ts:110-123 (registration)

  Registration of the 'sqrt' tool in the tools array, including name, description, and input schema definition.

  {
    name: "sqrt",
    description: "Calculate square root of a number",
    inputSchema: {
      type: "object",
      properties: {
        number: {
          type: "number",
          description: "Number to calculate square root of",
        },
      },
      required: ["number"],
    },
  },

• src/index.ts:113-122 (schema)

  Input schema for the 'sqrt' tool defining the expected 'number' parameter.

  inputSchema: {
    type: "object",
    properties: {
      number: {
        type: "number",
        description: "Number to calculate square root of",
      },
    },
    required: ["number"],
  },