MCP Grew a UI Layer: The First Official Extension Renders Apps in Your Chat
· 5 min read
For its entire life, MCP has spoken in text. Tools return strings and JSON; the model narrates the result back to you in prose. That was a deliberate, sensible constraint, and it was always going to hit a ceiling. Some answers are a paragraph. Others are a chart, a date picker, a seat map, a diff you want to click.
As of early 2026, MCP has an answer: MCP Apps, the protocol's first official extension, which lets a tool ship interactive UI that renders right inside the conversation.