---
title: "tool si.act.assign"
description: "Assigns one lead to one user by hand, or hands it on: The answer gives the assignment, with the person who made it as its reason."
section: reference
address: /reference/tools/si-act-assign
contract: 0476e35e6e275db5
---

# tool si.act.assign

Assigns one lead to one user by hand, or hands it on: The answer gives the assignment, with the person who made it as its reason.

[figure: Over MCP, si.act.assign takes AssignInput and returns a card whose body is LeadAssignment.]

The answer gives the assignment, with the person who made it as its reason. The call needs the act grant at the strategy rung.



| | |
|---|---|
| input | [AssignInput](/concepts/assigninput) |
| result | a card whose body is [LeadAssignment](/concepts/leadassignment) |
| read-only | no |
| destructive | yes |
| card address | `ui://scale-intelligence/cards/LeadAssignment` |
| HTTP route | [`/v1/act/assign`](/reference/act/assign) |





| field | type | required | note |
|---|---|---|---|
| `lead` | `id` | yes |  |
| `user` | `id` | yes |  |
| `reason` | `text` | yes |  |