---
title: "tool si.read.effect"
description: "a move, the window: the effect with its interval, or withheld with what would settle it."
section: reference
address: /reference/tools/si-read-effect
contract: 0476e35e6e275db5
---

# tool si.read.effect

a move, the window: the effect with its interval, or withheld with what would settle it.

[figure: Over MCP, si.read.effect takes EffectInput and returns a card whose body is Effect.]

the effect with its interval, or withheld with what would settle it. The call needs the read grant at the strategy rung.



| | |
|---|---|
| input | [EffectInput](/concepts/effectinput) |
| result | a card whose body is [Effect](/concepts/effect) |
| read-only | yes |
| destructive | no |
| card address | `ui://scale-intelligence/cards/Effect` |
| HTTP route | [`/v1/read/effect`](/reference/read/effect) |





| field | type | required | note |
|---|---|---|---|
| `move` | `id` | yes |  |
| `window` | [Window](/concepts/window) | no |  |