Sierra acquires Anon to add browser-based agent authentication and navigation

Sierra has acquired Anon, a startup that built infrastructure letting enterprise AI agents sign in, navigate pages and fill out forms on websites that have no API. Anon raised more than $13M and shipped a product used by hundreds of customers, and its team will now help Sierra's agents complete steps that require logging into a site or working through a browser portal. Founder Daniel Mason says better models and harnesses have made browser agents far more reliable, and Sierra's Horizon agents are pursuing longer-running goals such as originating a loan or getting prior authorization for a healthcare procedure.