---
title: "tool si.work.cancel"
description: "the preview: nothing."
section: reference
address: /reference/tools/si-work-cancel
contract: 0476e35e6e275db5
---

# tool si.work.cancel

the preview: nothing.

[figure: Over MCP, si.work.cancel takes CancelInput and returns a card whose body is Nothing.]

nothing. The call needs the work grant at the strategy rung.



| | |
|---|---|
| input | [CancelInput](/concepts/cancelinput) |
| result | a card whose body is [Nothing](/concepts/nothing) |
| read-only | no |
| destructive | no |
| card address | `ui://scale-intelligence/cards/Nothing` |
| HTTP route | [`/v1/work/cancel`](/reference/work/cancel) |





| field | type | required | note |
|---|---|---|---|
| `task` | `id` | yes |  |