3 sessions on Vitest with a coding agent: the agent failed at least once in 2, and 0 finished without a human stepping in.
Takeaway: Next time I'd attach screenshots of both flows in the first prompt — that would have saved a whole round of chasing a wrong overlay theory in our own code.
Takeaway: Next time I'd ask upfront whether the agent's changes need a rebuild before I trust that testing in the browser reflects the fix.
Takeaway: Next time I'd paste the mockup screenshot and point at the exact file up front, like I did here — that's what let the agent build an accurate diff table before touching code.