Tracking ChatGPT MCP App Compatibility

Hi,

Looking at the GitHub repo for MCP ext-apps, looks like there’s regular activity (lots is tests/docs/etc and not really functional but still).

My question is how we know what is or is not supported when in the ChatGPT implementation of MCP ext-apps? Is the App SDK changelog ( Changelog – Apps SDK | OpenAI Developers ) the best place or is there someplace else?

Will support be rev’d only based on major spec version number changes, etc. Apologies if this is in the docs someplace and I’ve just missed it.