Implementing MCP UI apps MCP UI apps are interactive React visualizations that render alongside tool results in MCP clients (e.g. Claude Desktop). They're built with the Mosaic component library and served via Cloudflare Workers Static Assets. Full reference: services/mcp/CONTRIBUTING.md. Quick workflow When to add a UI app When an MCP tool returns structured data that benefits from visual presentation — tables, detail views, charts, status badges, etc. Without a UI app, tool results are shown as plain text/JSON in the chat. Architecture View components Place view components in . Detail view…