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mcp-builder

DEPRECATED: This skill has been replaced by `mcp-app-builder`.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.

The English summary is being prepared. Showing the original description.

CopilotKit/Generative-UI-Global-Hackathon-Starter-Kit
See how to install

Files included (13)

  • SKILL.md2.9 KB
  • evals/architecture.json2.1 KB
  • evals/implementation.json1.5 KB
  • evals/README.md460 B
  • evals/skill.json1.9 KB
  • evals/widgets.json1.8 KB
  • LICENSE.txt8.9 KB
  • references/design-and-architecture.md5.9 KB
  • references/proxy.md3.2 KB
  • references/resource-templates.md3.1 KB
  • references/response-helpers.md6.4 KB
  • references/tools-and-resources.md9.6 KB
  • references/widgets.md13.7 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

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

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