# ui.viewport

> Talos next · Since next

Size the engine's surface in device pixels, 64 to 8192 a side, and lay the UI out at it: a screenshot matrix's resolution axis, on one engine.

dpr, the device-pixel ratio to lay out for, 0.25 to 8, is taken as given, never inferred; layout is width/dpr by height/dpr. Answers the applied scale block (viewport: the logical size), laid out already: ui.tree reads the new size.

| | |
|---|---|
| Title | Resize the surface |
| Mode | `editor` |
| Token cost | about 187 tokens (listed only when its toolset is enabled) |
| Toolset | `ui` |

## Arguments

| Argument | Type | Required | Default | Allowed values | Description |
|---|---|---|---|---|---|
| `agent` | `string` | no |  |  | The name of the agent making the call, when several agents share one connection: each named agent is its own actor and plays its own game. Leave it out when there is one agent. |
| `dpr` | `number` | no |  |  |  |
| `height` | `integer` | yes |  |  |  |
| `width` | `integer` | yes |  |  |  |

## Example

An MCP `tools/call` with the required arguments (placeholders in angle brackets).

```json
{
  "name": "ui.viewport",
  "arguments": {
    "height": 64,
    "width": 64
  }
}
```