ChatGPT App Builder
Build ChatGPT apps with interactive widgets using mcp-use. Zero-config widget development with automatic registration and built-in React hooks.
The app is consumed by two users at once: the human and the ChatGPT LLM. They collaborate through the widget -- the human interacts with it, the LLM sees its state. The widget is your shared surface.
Before You Code
- Clarify what to build → discover.md: when starting a new app, validating an idea, or scoping features
- Design tools and widgets → architecture.md: when deciding what needs UI vs tools-only, designing UX flows
Setup
- Scaffold and run → setup.md: when creating a new project, starting dev server, connecting to ChatGPT/Claude
Implementation
- Server handlers + widget creation → server-and-widgets.md: when writing server.tool() with widgets, widget() helper, React widget files
- Widget state and LLM context → state-and-context.md: when persisting state, triggering LLM from widget, managing ephemeral vs persistent…
