---
title: "tool si.act.webhook"
description: "the address, what to be told about, and a secret to sign with: the row."
section: reference
address: /reference/tools/si-act-webhook
contract: 0476e35e6e275db5
---

# tool si.act.webhook

the address, what to be told about, and a secret to sign with: the row.

[figure: Over MCP, si.act.webhook takes WebhookInput and returns a card whose body is Telling.]

the row. The call needs the act grant at the tenant rung.



| | |
|---|---|
| input | [WebhookInput](/concepts/webhookinput) |
| result | a card whose body is [Telling](/concepts/telling) |
| read-only | no |
| destructive | yes |
| card address | `ui://scale-intelligence/cards/Telling` |
| HTTP route | [`/v1/act/webhook`](/reference/act/webhook) |





| field | type | required | note |
|---|---|---|---|
| `telling` | [Telling](/concepts/telling) | yes |  |