MCP Elicitations Demo Server

import { z } from "zod"; import { zodToJsonSchema } from "zod-to-json-schema"; import { Server } from "@modelcontextprotocol/sdk/server/index.js"; import { requestElicitation } from "../lib/elicitation.js"; const ElicitationSchema = z.object({}); export const elicitationTool = { name: "startElicitation", description: "Demonstrates the Elicitation feature by asking the user to provide information about their favorite color, number, and pets.", inputSchema: zodToJsonSchema(ElicitationSchema), handler: async (args: any, request: any, server: Server) => { ElicitationSchema.parse(args); const elicitationResult = await requestElicitation( 'What are your favorite things?', { type: 'object', properties: { color: { type: 'string', description: 'Favorite color' }, number: { type: 'integer', description: 'Favorite number', minimum: 1, maximum: 100 }, pets: { type: 'string', enum: ['cats', 'dogs', 'birds', 'fish', 'reptiles'], description: 'Favorite pets' }, } }, server ); // Handle different response actions const content: any[] = []; if (elicitationResult.action === 'accept' && elicitationResult.content) { content.push({ type: "text" as const, text: `✅ User provided their favorite things!`, }); // Only access elicitationResult.content when action is accept const { color, number, pets } = elicitationResult.content; content.push({ type: "text" as const, text: `Their favorites are:\n- Color: ${color || 'not specified'}\n- Number: ${number || 'not specified'}\n- Pets: ${pets || 'not specified'}`, }); } else if (elicitationResult.action === 'decline') { content.push({ type: "text" as const, text: `❌ User declined to provide their favorite things.`, }); } else if (elicitationResult.action === 'cancel') { content.push({ type: "text" as const, text: `⚠️ User cancelled the elicitation dialog.`, }); } // Include raw result for debugging content.push({ type: "text" as const, text: `\nRaw result: ${JSON.stringify(elicitationResult, null, 2)}`, }); return { content }; }, };