Victor Yocco lays out a UX research playbook for agentic AI in Smashing Magazine—autonomy taxonomy, research methods, metrics, the works. It’s one of the more practical pieces I’ve seen on designing AI that acts on behalf of users.

The autonomy framework is useful. Yocco maps four modes from passive monitoring to full autonomy, and the key insight is that trust isn’t binary:

A user might trust an agent to act autonomously for scheduling, but keep it in “suggestion mode” for financial transactions.

That tracks with how I think about designing AI features. The same user will want different levels of control depending on what’s at stake. Autonomy settings should be per-domain, not global.

On measuring whether it’s working:

For autonomous agents, we measure success by silence. If an agent executes a task and the user does not intervene or reverse the action within a set window, we count that as acceptance.

That’s a different and interesting way to think about design metrics—success as the absence of correction. Yocco pairs this with microsurveys on the undo action so you’re not just counting rollbacks but understanding why they happen.

The cautionary section is worth flagging. Yocco introduces “agentic sludge”—where traditional dark patterns add friction to trap users, agentic sludge removes friction so users agree to things that benefit the business without thinking. Pair that with LLMs that sound authoritative even when wrong, and you have a system that can quietly optimize against the user’s interests. We’ve watched this happen before with social media. The teams that skip the research Yocco describes are the ones most likely to build it again.