Anthropic, OpenAI and MCP-UI propose the MCP Apps extension (SEP-1865)
Proposed the MCP Apps extension (SEP-1865)
Why it matters
Lets servers provide interactive UIs via the ui:// scheme and sandboxed iframes; co-authored by competing camps
Source — Primary sources first; secondary reports are labelled “Press”
Officialblog.modelcontextprotocol.iohttps://blog.modelcontextprotocol.io/posts/2025-11-21-mcp-apps/Added in Week 35, 2026 · See that week