mcp-apps
MCP Apps
MCP Apps is the first official MCP extension (spec 2026-01-26, co-authored by Anthropic and OpenAI). It enables interactive HTML UIs rendered in sandboxed iframes inside MCP hosts. Extension ID: io.modelcontextprotocol/ui. npm package: @modelcontextprotocol/ext-apps.
MCP Apps bridge the gap between LLM tool calls and rich visual interfaces — the model sees text, users see interactive UIs.
Quick Start
The fastest path is the official create-mcp-app skill from the ext-apps repo:
npx skills add modelcontextprotocol/ext-apps --skill create-mcp-app
Then ask the agent: "Create an MCP App that displays a color picker." For manual setup, see references/build-guide.md.
Architecture
Three layers:
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