it-tools-mcp/build/tools/math/calculate_percentage/index.js

Full MCP 2025-06-18 compliant server with 121+ IT tools, logging, ping, progress tracking, cancellation, and sampling utilities

import { z } from "zod";
export function registerCalculatePercentage(server) {
    server.registerTool("calculate_percentage", {
        description: "Calculate percentages, percentage of a number, or percentage change",
        inputSchema: {
            operation: z.enum(["percentage-of", "what-percentage", "percentage-change"]).describe("Type of percentage calculation"),
            value1: z.number().describe("First value"),
            value2: z.number().describe("Second value")
        },
        // VS Code compliance annotations
        annotations: {
            title: "Calculate Percentage",
            description: "Calculate percentages, percentage of a number, or percentage change",
            readOnlyHint: false
        }
    }, async ({ operation, value1, value2 }) => {
        try {
            let result;
            let explanation;
            switch (operation) {
                case "percentage-of":
                    // value1% of value2
                    result = (value1 / 100) * value2;
                    explanation = `${value1}% of ${value2} = ${result}`;
                    break;
                case "what-percentage":
                    // value1 is what percentage of value2
                    result = (value1 / value2) * 100;
                    explanation = `${value1} is ${result.toFixed(2)}% of ${value2}`;
                    break;
                case "percentage-change":
                    // percentage change from value1 to value2
                    result = ((value2 - value1) / value1) * 100;
                    explanation = `Percentage change from ${value1} to ${value2} = ${result.toFixed(2)}%`;
                    break;
                default:
                    throw new Error("Invalid operation");
            }
            return {
                content: [
                    {
                        type: "text",
                        text: explanation
                    }
                ]
            };
        }
        catch (error) {
            return {
                content: [
                    {
                        type: "text",
                        text: `Error calculating percentage: ${error instanceof Error ? error.message : 'Unknown error'}`
                    }
                ]
            };
        }
    });
}