Build an app INSIDE ChatGPT (using the OpenAI Apps SDK and MCP)
Riley builds a todo list (everyone's favourite) inside ChatGPT using the OpenAI Apps SDK and MCP.
Gadget now has a built-in ChatGPT app connection. Start building at: https://gadget.new
Fork the most up-to-date version of the todo list: https://app.gadget.dev/auth/fork?doma...
Build in React, handle multi-tenancy, and use Streamable HTTP for MCP in the updated blog post: https://gadget.dev/blog/how-to-build-...
Templates from this video (outdated, but match the video steps):
Fork this todo list: https://app.gadget.dev/auth/fork?doma...
Fork the hello, world starter: https://app.gadget.dev/auth/fork?doma...
Additional resources:
Gadget docs: https://docs.gadget.dev/guides/plugin...
Gadget developer Discord: https://ggt.link/discord
OpenAI Apps SDK: https://developers.openai.com/apps-sdk/
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