openui-app
Build, edit, or read durable apps in the workspace. REQUIRED before calling `app_create`, `app_update`, `get_app`, or `create_markdown_artifact`. Full reactive surface — `$state`, `Query`, `Mutation`, `@Run`/`@Set`/`@Reset`, scheduled refresh, persistent SQLite. Use for dashboards, briefings, command centers, trackers — any persistent surface the user reopens.