# ui.activate

> Talos next · Since next

[editor (test session)] Press a node by its ui.tree id, as a click would.

Refuses with a code when it is hidden, disabled, clipped away, not hit-testable, painted over by something (named) or on a screen under the top one: the answer to "why did nothing happen". Needs input granted: an editor you started does; a person's Play grants only observe and capture: use play.input there.

| | |
|---|---|
| Title | Press a UI node |
| Mode |  |
| Token cost | about 159 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. |
| `id` | `string` | yes |  |  | The node, qualified or bare |

## Example

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

```json
{
  "name": "ui.activate",
  "arguments": {
    "id": "<id>"
  }
}
```