MCP Server Tools

import { Server, StdioServerTransport, } from "@modelcontextprotocol/sdk/server/index.js"; import { ListToolsRequestSchema, CallToolRequestSchema, } from "@modelcontextprotocol/sdk/types.js"; // Initialize server const server = new Server({ name: "agentic-mcp-server", version: "1.0.0", }); // Define available tools const tools = [ { name: "calculator", description: "Performs basic arithmetic operations", inputSchema: { type: "object", properties: { operation: { type: "string", enum: ["add", "subtract", "multiply", "divide"], description: "The arithmetic operation to perform", }, a: { type: "number", description: "First number", }, b: { type: "number", description: "Second number", }, }, required: ["operation", "a", "b"], }, }, { name: "text_processor", description: "Processes text with various transformations", inputSchema: { type: "object", properties: { action: { type: "string", enum: ["uppercase", "lowercase", "reverse", "wordcount"], description: "The text processing action", }, text: { type: "string", description: "The text to process", }, }, required: ["action", "text"], }, }, { name: "json_formatter", description: "Formats and validates JSON", inputSchema: { type: "object", properties: { action: { type: "string", enum: ["format", "validate", "minify"], description: "The JSON action", }, input: { type: "string", description: "The JSON string to process", }, }, required: ["action", "input"], }, }, ]; // Handle tool list requests server.setRequestHandler(ListToolsRequestSchema, async () => { return { tools }; }); // Handle tool calls server.setRequestHandler(CallToolRequestSchema, async (request) => { const { name, arguments: args } = request; try { switch (name) { case "calculator": { const { operation, a, b } = args; let result; switch (operation) { case "add": result = a + b; break; case "subtract": result = a - b; break; case "multiply": result = a * b; break; case "divide": if (b === 0) throw new Error("Division by zero"); result = a / b; break; default: throw new Error(`Unknown operation: ${operation}`); } return { content: [ { type: "text", text: `${a} ${operation} ${b} = ${result}`, }, ], }; } case "text_processor": { const { action, text } = args; let result; switch (action) { case "uppercase": result = text.toUpperCase(); break; case "lowercase": result = text.toLowerCase(); break; case "reverse": result = text.split("").reverse().join(""); break; case "wordcount": result = `Word count: ${text.split(/\s+/).filter((w) => w).length}`; break; default: throw new Error(`Unknown action: ${action}`); } return { content: [ { type: "text", text: result, }, ], }; } case "json_formatter": { const { action, input } = args; let result; switch (action) { case "format": result = JSON.stringify(JSON.parse(input), null, 2); break; case "validate": { try { JSON.parse(input); result = "JSON is valid"; } catch (e) { result = `JSON is invalid: ${e.message}`; } break; } case "minify": result = JSON.stringify(JSON.parse(input)); break; default: throw new Error(`Unknown action: ${action}`); } return { content: [ { type: "text", text: result, }, ], }; } default: return { content: [ { type: "text", text: `Unknown tool: ${name}`, }, ], isError: true, }; } } catch (error) { return { content: [ { type: "text", text: `Error: ${error.message}`, }, ], isError: true, }; } }); // Start server async function main() { const transport = new StdioServerTransport(); await server.connect(transport); console.error("MCP Server started"); } main().catch(console.error);