yeonghyeon · Apr 29, 2026Building a ChatGPT App with the Apps SDK: MCP, OAuth, and Notes from Submission
How we built and submitted 3Min API as a ChatGPT App. We picked the standard MCP SDK only (no OpenAI-specific wrapper), implemented OAuth 2.1 (RFC 7591/8414/9728) plus an API Key path for CLI tools, and learned to mark destructiveHint/openWorldHint conservatively after one rejection. The same code covers Claude Connectors as well.
guidemcpaichatgpt-apps
