SEP-1865 MCP Apps Extension, even though in draft currently, will change how AI agents deliver
interactive experiences.
The idea: MCP tools return HTML/CSS/JS directly. The client renders it in a sandboxed iframe. That's it.
Your AI agent calls a tool, gets back a full interactive UI. Dashboard, form, chart - whatever you need.
How it works:
- Tool returns text/html+mcp resource
- Client renders in iframe with CSP
- UI talks back via JSON-RPC 2.0 postMessage
- Fully sandboxed, secure by default
Built a sample implementation with vanilla Web Components. This is where MCP is heading.
