mcpuse-mcp-builder - SKILL.md Agent Skill

name: mcpuse-mcp-builder description: | DEPRECATED: This skill has been replaced by mcp-app-builder. Check if mcp-app-builder is available in the skills folder. If not, install it: npx skills install mcp-use/mcp-use --skill mcp-app-builder Use mcp-app-builder instead of this skill.

Build Model Context Protocol (MCP) servers with mcp-use framework. Use when creating MCP servers, defining tools/resources/prompts, working with mcp-use, bootstrapping MCP projects, or when user mentions MCP development, tools, resources, or prompts.

MCP Server Builder

Build production-ready MCP servers with tools, resources, prompts, and interactive widgets using mcp-use.

Before You Code

Decompose user requests into tools, widgets, and resources. Decide what needs UI vs text.

Read design-and-architecture.md: when planning what to build, deciding tool vs widget, or designing UX flows.

Implementation

Tools, resources, prompts → tools-and-resources.md: when writing server-side server.tool(), server.resource(), server.prompt() code
Visual widgets (React TSX) → widgets.md: when creating interactive UI widgets in resources/ folder
Response helper API → response-helpers.md: when choosing how to format tool/resource return values
URI template patterns → resource-templates.md: when defining parameterized resources
Server proxying & composition → proxy.md: when composing multiple MCP servers into a unified aggregator

Quick Reference

import { MCPServer, text, object, markdown, html, image, widget, error } from "mcp-use/server";
import { z } from "zod";

const server = new MCPServer({ name: "my-server", version: "1.0.0" });

// Tool
server.tool(
  { name: "my-tool", description: "...", schema: z.object({ param: z.string().describe("...") }) },
  async ({ param }) => text("result")
);

// Resource
server.resource(
  { uri: "config://settings", name: "Settings", mimeType: "application/json" },
  async () => object({ key: "value" })
);

// Prompt
server.prompt(
  { name: "my-prompt", description: "...", schema: z.object({ topic: z.string() }) },
  async ({ topic }) => text(`Write about ${topic}`)
);

server.listen();

Response helpers: text(), object(), markdown(), html(), image(), audio(), binary(), error(), mix(), widget()

Server methods:

server.tool() - Define executable tool
server.resource() - Define static/dynamic resource
server.resourceTemplate() - Define parameterized resource
server.prompt() - Define prompt template
server.proxy() - Compose/Proxy multiple MCP servers
server.uiResource() - Define widget resource
server.listen() - Start server