Keep the HTML your agent wrote.

Store it on your machine under one key. Open yesterday’s version. Preview in a sandbox.

htmlark put --key q3-sales --file ./q3.html --json

key	ver	id	note
q3-sales	4	art_1DD93GZ0FWPM92GPPF4HW0	head
q3-sales	3	art_1DD93GZ0FWPM92GPPF4HW0	restored from v1
q3-sales	2	art_1DD93GZ0FWPM92GPPF4HW0	dirty, not run
q3-sales	1	art_1DD93GZ0FWPM92GPPF4HW0	first put

The file should outlive the session.

Agents write pages that land in Downloads or a chat sidebar. The next model rewrites the whole thing. You cannot open v1. htmlark treats that file as an artifact: same key, new version, old bytes still on disk.

It is a local CLI, not a hosted gallery.

Preview on 127.0.0.1, inside a CSP sandbox. Share by exporting a file. This release has no public URL. It does not replace Claude Artifacts, ChatGPT, or Teable.