Tweaks are the live controls the agent exposes in the design itself — sliders, toggles and pickers wired to the parameters the design actually uses. Drag a control and the preview repaints immediately; it's steering without a turn, without waiting, and without spending a prompt.
What the panel looks like
The Tweaks button in the preview rail opens the panel: a column of controls grouped by what they move — colors, radii, spacing, density, motion — each labeled, each showing its current value. What's there depends on the design: a landing page might expose accent hue and corner radius; a dashboard might expose density and contrast.
The controls are real: they're wired into the design's own variables, so a drag changes the files' rendered output directly — not a mock of the change, the change itself.
Instant, undoable, free
Because a tweak re-renders rather than rebuilds, it's instant and it costs nothing — no turn, no meter, no wait. That makes Tweaks the right tool for exploration: try the accent in every hue, tighten and loosen the spacing, see what the design looks like at extremes before you commit to a direction.
Tweaks vs comments vs a follow-up
- Tweak — the parameter already exists; you just move it. Fastest, but only for what the design exposes.
- Comment pin — a specific element needs a specific change the controls don't cover. Costs a turn.
- Follow-up brief — a direction change, not a parameter. Costs a turn.
Rule of thumb: try the Tweaks panel first — if the control is there, it wins; if it isn't, that's what pins are for.
Keeping a tweak
A tweak changes the live render — to make it the design's real value, tell the agent. Send a one-line follow-up ("keep the tighter density") and the change gets written into the files and the design system, so it survives the next rebuild. Until then, the tweak rides as the live state.
Tip: If a control you'd use every time isn't exposed, say so — "expose the card radius as a tweak" in a follow-up adds it, and the next design keeps it. The panel grows toward your taste.