I let an AI agent loose on my frontend for a week. Honest scorecard.

Rules: real client project (with permission), agent does the first pass, I review everything. Wins: it cleared 14 tickets of the boring kind (prop drilling cleanup, a11y labels, dead CSS) in the time I would normally do 4. Losses: it confidently "fixed" a race condition by adding a setTimeout, and it writes CSS like someone who has never seen a design system. Net: I shipped more, reviewed harder, and enjoyed the week MORE because the tedious 40% was gone. The leash matters though: PR-only access, no direct pushes, and a checklist it must fill in. It's a junior dev with infinite energy and zero shame.