Claude Code starting doing this thing recently, where it will take a big report it wrote and just open it in a browser as a private artifact.
At first I felt violated, cause why is my agent opening a browser without me asking?
But as it's happened a few more times, they're usually things I would want to read in a slightly nicer styling, and it's been tweaked now so it'll ask before doing it, so I gotta give them a big W on this new behavior.