---
title: "tool si.act.parameter"
description: "a parameter by its name, its value and its scope: the parameter as written, at its new version."
section: reference
address: /reference/tools/si-act-parameter
contract: 0476e35e6e275db5
---

# tool si.act.parameter

a parameter by its name, its value and its scope: the parameter as written, at its new version.

[figure: Over MCP, si.act.parameter takes ParameterWriteInput and returns a card whose body is Parameter.]

the parameter as written, at its new version. The call needs the act grant at the user rung.



| | |
|---|---|
| input | [ParameterWriteInput](/concepts/parameterwriteinput) |
| result | a card whose body is [Parameter](/concepts/parameter) |
| read-only | no |
| destructive | yes |
| card address | `ui://scale-intelligence/cards/Parameter` |
| HTTP route | [`/v1/act/parameter`](/reference/act/parameter) |





| field | type | required | note |
|---|---|---|---|
| `name` | `text` | yes |  |
| `value` | `json` | yes |  |
| `scope` | [Scope](/concepts/scope) | no | the caller's tenant when absent |