If you, like me, want an overview of UI integration for LLMs and are wondering how A2UI and MCP Apps compare and what they offer: Agent UI Standards Multiply: MCP Apps and Google’s A2UI - Richard MacManus helps. I have implemented A2UI in bDS so that the LLM can also use visual aspects in the internal chat, and I really like that. But the idea of incorporating parts of my UI into external agents is also fascinating. Even if I find that "local HTML/JS in an IFrame" somehow sounds like a hack at first, but much in the LLM environment gives me the feeling right now, simply because everything is pushed through a normal text stream and you hope that the LLMs adhere to the formats (even A2UI works like this).