chatgpt-app-builder

# IMPORTANT: How to Use This Skill This file provides a NAVIGATION GUIDE ONLY. Before implementing any MCP server features, you MUST: 1. Read this overview to understand which reference files are relevant 2. **ALWAYS read the specific reference file(s)** for the features you're implementing 3. Apply the detailed patterns from those files to your implementation **Do NOT rely solely on the quick reference examples in this file** - they are minimal examples only. The reference files contain critical best practices, security considerations, and advanced patterns. --- # MCP Server Best Practices Comprehensive guide for building production-ready MCP servers with tools, resources, prompts, and widgets using mcp-use. ## ⚠️ FIRST: New Project or Existing Project? **Before doing anything else, determine whether you are inside an existing mcp-use project.** **Detection:** Check the workspace for a `package.json` that lists `"mcp-use"` as a dependency, OR any `.ts` file that imports from `"mcp-use/server"`. ``` ├─ mcp-use project FOUND → Do NOT scaffold. You are already in a project. │ └─ Skip to "Quick Navigation" below to add features. │ ├─ NO mcp-use project (empty dir, unrelated project, or greenfield) │ └─ Scaffold first with npx create-mcp-use-app, then add features. │ See "Scaffolding a New Project" below. │ └─ Inside an UNRELATED project (e.g. Next.js app) and user wants an MCP server └─ Ask the user where to create it, then scaffold in that directory. Do...