I've been having a surprising amount of success recently telling Claude Code to test the frontend it's building using Playwright, including interacting with the UI and having it take its own screenshots to feed into its vision ability to "see" what's going on.

That works well with QT and desktop apps as well. Asking Claude Code to write an MCP integrated into a desktop all implementing the same features as Playwright is a half hour exercise.

It's kind of funny that we posted basically the exact comment at the same time, down to quoting "see"!