This information is incorrect; the UI of the ChatGPT App is not auto-generated. The current implementation involves using pre-made UI templates provided by MCP (which can be packaged as a JS package for npm) and displayed in an iframe. After ChatGPT retrieves data from MCP, it fills this iframe (the filling here is not intelligent filling; it simply populates predefined fields). At least at this stage, the entire UI has no composability. Additionally, there are various permission restrictions, making it even less flexible than the TG mini-program.