Mup

MUP is an open-source framework for creating interactive UI components that operate inside LLM chat interfaces. It allows both users and LLMs to control shared UI widgets—such as slide decks, PDF readers, Markdown workspaces, music sequencers, and more—by combining visual interfaces with callable functions. MUP is designed for anyone who wants to experience agentic AI through clickable, visual controls (not just developers), making advanced AI and agent workflows accessible within chat-based environments like Claude Code or Claude Desktop.