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wangchenglong
f7c39b9d2a
The Design Files pane used to sit on an empty state until a run finished and the first artifact dropped in. Everything the run was doing happened somewhere the user could not see, and the wait carried no signal that anything was happening at all. It now watches the shallowest index.html the run has produced (or the most recently written HTML file) and renders it live beside a feed of the steps behind it, with a toggle between the step feed and the full preview. A new cross-runtime contract, preview-build-focus, lets the sandboxed preview frame answer "where in this page are you writing right now" — either by a literal string the agent just wrote or by naming one of the page's own top-level sections — so the host can walk a cursor down the page as it is written instead of jumping to wherever the last run of text happens to land. The frame has no allow-same-origin, so it posts to '*' and the host identifies it by event.source. latest-user-prompt goes away with the empty state that echoed it: the pane now names what the run is doing, which is the more useful of the two, and keeping both meant recomputing a prompt string on every streamed token for a line nobody read. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>