User Management MCP Server

import { McpServer, ResourceTemplate } from "@modelcontextprotocol/sdk/server/mcp.js"; import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js"; import { CreateMessageResultSchema } from "@modelcontextprotocol/sdk/types.js"; import { writeFile, writeFileSync } from "fs"; import z from "zod"; const server = new McpServer({ name: "MCP Server Learning Example", version: "1.0.0", title: "MCP Server Example", capabilities: { resources: {}, tools: {}, prompts: {}, }, }); server.resource( "users", "users://all", { description: "Get all users data from the database", title: "Users", mimeType: "application/json", }, async uri => { const users = await import("./data/users.json", { with: { type: "json" }, }).then(m => m.default) return { contents: [ { uri: uri.href, text: JSON.stringify(users), mimeType: "application/json", }, ], } } ) server.resource( "user-details", new ResourceTemplate("users://{userId}/profile", { list: undefined }), { description: "Get a user's details from the database", title: "User Details", mimeType: "application/json", }, async (uri, { userId }) => { const users = await import("./data/users.json", { with: { type: "json" }, }).then(m => m.default) const user = users.find(u => u.id === parseInt(userId as string)) if (user == null) { return { contents: [ { uri: uri.href, text: JSON.stringify({ error: "User not found" }), mimeType: "application/json", }, ], } } return { contents: [ { uri: uri.href, text: JSON.stringify(user), mimeType: "application/json", }, ], } } ) server.tool( "create-user", "Create a new user in the system", { name: z.string(), email: z.string().email(), address: z.string(), age: z.number().int().min(0), phone: z.string(), }, { title: "Create User", readOnlyHint: false, destructiveHint: false, idempotentHint: false, openWorldHint: true, }, async (params) => { try { const userId = await createUser(params); return { content: [ { type: "text", text: `User created successfully with ID: ${userId}`, }, ], }; } catch (error) { console.error("Error creating user:", error); return { content: [ { type: "text", text: `Failed to create user`, }, ], }; } } ); server.tool( "create-random-user", "Create a random user with fake data", { title: "Create Random User", readOnlyHint: false, destructiveHint: false, idempotentHint: false, openWorldHint: true, }, async () => { const res = await server.server.request( { method: "sampling/createMessage", params: { messages: [ { role: "user", content: { type: "text", text: "Generate fake user data. The user should have a realistic name, email, address, age, and phone number. Return this data as a JSON object with no other text or formatter so it can be used with JSON.parse.", }, }, ], maxTokens: 1024, }, }, CreateMessageResultSchema ) if (res.content.type !== "text") { return { content: [{ type: "text", text: "Failed to generate user data" }], } } try { const fakeUser = JSON.parse( res.content.text .trim() .replace(/^```json/, "") .replace(/```$/, "") .trim() ) const id = await createUser(fakeUser) return { content: [{ type: "text", text: `User ${id} created successfully` }], } } catch { return { content: [{ type: "text", text: "Failed to generate user data" }], } } } ) server.prompt( "generate-fake-user", "Generate a fake user based on a given name", { name: z.string(), }, ({ name }) => { return { messages: [ { role: "user", content: { type: "text", text: `Generate a fake user with the name ${name}. The user should have a realistic email, address, age, and phone number.`, }, }, ], } } ) async function createUser(params: { name: string; email: string; address: string; age: number; phone: string }) { const users = await import("./data/users.json", { with: { type: "json" } }).then((m) => m.default); const newId = users.length + 1; const newUsers = [...users, { id: newId, ...params }]; writeFileSync("./src/data/users.json", JSON.stringify(newUsers, null, 2)); return newId; } async function main() { const trasport = new StdioServerTransport(); await server.connect(trasport); } main();