Building ChatGPT Apps

Create interactive applications that live inside ChatGPT using the Model Context Protocol. From MCP servers to widgets, authentication to submission.

4 chapters12 lessons2.5 hours

Chapters

Build a production MCP server with TypeScript: tool definitions, input schemas, structured responses, and OAuth 2.1 authentication.

Master the window.openai API for tool calls, state management across three layers, and file handling with the Agentic Commerce Protocol.

Test locally with MCP Inspector and ngrok, deploy to production, and navigate the App Store submission process including common rejection reasons.