Anthropic opens MCP to interactive UI apps inside Claude chat

Anthropic released a major open extension to the MCP protocol that lets MCP servers render interactive, app-like UIs within chat interfaces. The MCP Apps framework enables third‑party tools and services to embed widgets and workflows directly in Claude, with early partners including Amplitude, Asana, Box, Canva, Figma, Slack and Salesforce planning integration. The feature builds on MCP‑UI and the ChatGPT Apps SDK, enabling scenarios like inline file previews, draft editing in Slack, dashboards, configuration wizards, and real‑time monitoring. Security guards include sandboxed iframes, host review of HTML content, auditable UI‑to‑host messages, and explicit user approval for UI‑initiated tool calls. The standard is open, so other chat providers can adopt it and build apps atop MCP.