I have it build self contained tools all the time and I've never had an issue getting it to let me download the standalone HTML page. Usually just a "Download"

I have it build self contained tools all the time and I've never had an issue getting it to let me download the standalone HTML page. Usually just a "Download" button on the artifact on the page UI screen (just confirmed with recent tool I had it build). Assuming you mean the claude.ai website interface.