Give a task and a start URL; a Jev-driven agent navigates a real headless browser until the goal is met, the stuck gate fires, or a budget (steps/seconds) is exhausted. Returns the final page in a chosen format (text, markdown, html, or an aria snapshot), the full step trace with confidences, console/page/network errors captured along the way, token usage with estimated cost, and a final screenshot. The result also reports typing degradation explicitly (degraded, warnings with codes, typing_provider, typing_model), so a failed typing generator is visible instead of silently typing keyword soup. For logins: with JEV_BROWSER_PASSWORD_ORIGIN set in this server's environment, password_file or password_env fills native password fields on that origin only, without the value ever entering model context, traces, or screenshots; never put the password value itself in any argument or in the task. To start already logged in, seed a session cookie instead via cookie_file or cookie_env (same reference-based delivery and redaction).