Show HN: MUP – Interactive UI inside LLM chat, so anyone can use agentic AI (github.com)

Agentic AI is powerful, but most people never experience it — it's trapped behind text commands and dev tools.

MUP (Model UI Protocol) lets you embed interactive UI directly in LLM chat. Each MUP is just a single .html file. The same functions can be triggered by the user (clicking a button) or by the LLM (function call). Both sides see each other's actions in real time.

The repo includes a PoC host and 9 example MUPs. Demo mode lets you interact with the UI side without an API key. Add an OpenAI key to see full LLM-UI collaboration.

Demo videos in the README show things like: drawing pixel art then charting its colors, a camera that captures a scene and the LLM recreates it, making beats on a drum machine with the LLM.

I'd love feedback on the protocol design.

1 comment

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newexpand 3mo ago ↗

Interesting approach. Making agentic AI accessible through visual UI instead of text commands is a real gap right now.

The dual interaction model — where both the user and the LLM can trigger the same functions — is a nice design choice. It avoids the "watch the AI work" problem where you're just a spectator.

Curious about the protocol design: how do you handle conflicts when the user and LLM try to act on the same element simultaneously? And is there a way for MUPs to communicate with each other, or is each one isolated?