---
title: "tool si.act.workflow"
description: "its steps and what starts it: the workflow, and for a preview what it would have done over history, acting on nothing."
section: reference
address: /reference/tools/si-act-workflow
contract: 0476e35e6e275db5
---

# tool si.act.workflow

its steps and what starts it: the workflow, and for a preview what it would have done over history, acting on nothing.

[figure: Over MCP, si.act.workflow takes WorkflowInput and returns a card whose body is WorkflowAnswer.]

the workflow, and for a preview what it would have done over history, acting on nothing. The call needs the act grant at the strategy rung.



| | |
|---|---|
| input | [WorkflowInput](/concepts/workflowinput) |
| result | a card whose body is [WorkflowAnswer](/concepts/workflowanswer) |
| read-only | no |
| destructive | yes |
| card address | `ui://scale-intelligence/cards/WorkflowAnswer` |
| HTTP route | [`/v1/act/workflow`](/reference/act/workflow) |





| field | type | required | note |
|---|---|---|---|
| `workflow` | [Workflow](/concepts/workflow) | yes |  |
| `do` | `one of write \| preview \| arm` | yes |  |