Websites block AI agents, complicating the autonomous-agent narrative

Major AI companies are rolling out autonomous agents designed to perform tasks on the web—from booking reservations to managing email and shopping. But websites are increasingly blocking these agents through technical barriers and policy changes, undermining claims about their usefulness.

Site operators are concerned about resource costs, data scraping, and loss of user engagement. The friction between AI companies' ambitions and web publishers' interests is forcing a reckoning over what autonomous agents can realistically accomplish.