ChatGPT Apps SDK Explained — Build Interactive AI Apps Inside ChatGPT Using MCP!

Description

0:00 🚀 ChatGPT Apps SDK Explained — Build Interactive AI Apps Inside ChatGPT Using MCP! 7:08 🧩 Running the Multimodal MCP App Inside ChatGPT Using the Apps SDK 13:35 ⚙️ Debugging the Multimodal ChatGPT App with the Apps SDK 📁 GitHub Repository: https://github.com/Ashot72/chatgpt-sdk-multimodal-mcp-app 0:00 🎬 1️⃣ Introducing the ChatGPT Apps SDK 🚀 What the ChatGPT Apps SDK is and why it’s revolutionary ChatGPT just released its Apps SDK, transforming it from a simple prompt interface into a full platform where developers can build and run interactive apps directly inside the chat — reaching over 800 million weekly users. 🧠 How it’s built on the Model Context Protocol (MCP) At its core, the SDK is powered by the Model Context Protocol (MCP) — an open standard that securely connects AI models to external tools, APIs, and data sources, enabling structured and permissioned communication between ChatGPT and your backend. 🧩 A live demo based on the Multimodal MCP (runs locally inside ChatGPT) This app is based on the GitHub repository below, which implements the Multimodal MCP framework. GitHub repo: https://github.com/Ashot72/Multi-Modal-MCP-Server-Client 🌐 How to use ngrok to connect your local app to ChatGPT Learn how to use ngrok to securely expose your localhost (port 3000) so ChatGPT can access and test your app as if it were deployed online. ngrok: https://ngrok.com/ ⚡ The Vercel Labs Next.js Starter for building your first ChatGPT app Kick-start your project with the Next.js Starter from Vercel Labs, which simplifies setup, configuration, and integration for new ChatGPT apps. Template: https://github.com/vercel-labs/chatgpt-apps-sdk-nextjs-starter 7:08 🧩 2️⃣ Running the Multimodal MCP Application 🚀 Learn how to run the Multimodal MCP app directly inside ChatGPT after setting it up locally. You’ll see how the multimodal UI loads, how the state is preserved even after refreshing, and how ChatGPT interacts with the tools powered by MCP. This section also highlights how the Apps SDK enables a smooth, interactive experience that bridges local development with ChatGPT’s in-chat environment. 13:35 ⚙️ 3️⃣ Running and Debugging the ChatGPT App 🚀 Learn how to run and debug your Multimodal MCP app inside ChatGPT using the Apps SDK and Next.js. This section explains how ChatGPT requests and renders your app through the /mcp endpoint, how the show_ui tool serves as the main entry point for interactive widgets, and how resources are registered and displayed in-chat. 🧩 Discover how state management, widget rendering, and fullscreen mode work together — from debugging in localhost to viewing the app directly in ChatGPT. You’ll also see how ChatGPT preserves your widget state and controls the UI independently, creating a smooth, connected developer experience.