What an agent in your browser sees here, and what Underscore chooses from. They change with the page.
Underscore.
The underscore from the logo got loose. Click it and ask for something: Jev, TypeSafe AI’s System One model, picks which of the page’s actions you mean, one typed Choice at a time, and Underscore hops over and does it. When Jev is unsure it asks instead of guessing. It offers a tip now and then, and mostly chooses to stay quiet. Double-click it for a trick; right-click for its menu.
The same actions are WebMCP tools. In a browser with WebMCP, or with the MCP-B extension, an agent can drive the site with them, and Underscore narrates what it does. Here it lives on a stage; everywhere else, in the corner.