Compose an A2UI payload (typed atom blocks) and render it into real HTML — a chart, dashboard, status board, decision tree, or any structured UI, once the right atoms are already known (see the a2ui-catalog skill for picking them). Use when asked to SHOW something rather than describe it, and the host can display HTML or open a link. Not for connecting a new agent/host to the MCP server itself (see a2ui-mcp).
