Build an app INSIDE ChatGPT (using the OpenAI Apps SDK and MCP)

Video Description

Riley builds a todo list (everyone's favourite) inside ChatGPT using the OpenAI Apps SDK and MCP. Fork the most up-to-date version of the todo list: https://app.gadget.dev/auth/fork?domain=openai-apps-sdk-todos.gadget.app Build in React, handle multi-tenancy, and use Streamable HTTP for MCP in the updated blog post: https://gadget.dev/blog/how-to-build-your-first-chatgpt-app Templates from this video (outdated, but match the video steps): Fork this todo list: https://app.gadget.dev/auth/fork?domain=my-todo-list-chatgpt.gadget.app Fork the hello, world starter: https://app.gadget.dev/auth/fork?domain=chatgpt-sdk-template.gadget.app Additional resources: Gadget docs: https://docs.gadget.dev/guides/plugins/openai/building-chatgpt-apps Gadget developer Discord: https://ggt.link/discord OpenAI Apps SDK: https://developers.openai.com/apps-sdk/ Docs and written instructions are coming soon, and will be updated as we get more familiar with the APIs! Chapters 00:00 Intro & install in ChatGPT 04:27 Template walk though: OAuth & MCP 10:18 Add a todo data model 11:12 Add MCP tool calls 20:30 Update the embedded widget 25:50 Testing & outro