The AI composer is the box where a LanderLab page starts. You describe the page you want, and the AI builds it. A suggestion types itself in while you think, and Tab takes it.
Press Build it and the box moves up to make room. Your prompt sits above it, the AI thinks out loud in a few short lines, and the build steps tick off one by one under it.
In the model menu you pick the model and the effort. Push the effort to Max and the build is split between six small Claude agents that work at the same time. The light turns warm, the agents run around the box, and each step shows which agent has it.
Here it plays by itself, and every second build is a swarm. Press on it and it is yours: type a prompt, open the menus, or drag the effort to Max.