---
title: "tool si.act.arm_monitor"
description: "the monitor's version, and for arming the preview it was judged by: the monitor's new state."
section: reference
address: /reference/tools/si-act-arm_monitor
contract: 0476e35e6e275db5
---

# tool si.act.arm_monitor

the monitor's version, and for arming the preview it was judged by: the monitor's new state.

[figure: Over MCP, si.act.arm_monitor takes ArmMonitorInput and returns a card whose body is Monitor.]

the monitor's new state. The call needs the act grant at the strategy rung.



| | |
|---|---|
| input | [ArmMonitorInput](/concepts/armmonitorinput) |
| result | a card whose body is [Monitor](/concepts/monitor) |
| read-only | no |
| destructive | yes |
| card address | `ui://scale-intelligence/cards/Monitor` |
| HTTP route | [`/v1/act/arm_monitor`](/reference/act/arm_monitor) |





| field | type | required | note |
|---|---|---|---|
| `monitor` | `id` | yes |  |
| `version` | `count` | yes |  |
| `arm` | `bool` | yes |  |
| `preview` | `id` | no | required to arm |