---
title: "tool si.act.mark_lead"
description: "Marks a condition on one lead, with a reason where the condition asks for one: The answer gives the lead's new outcome."
section: reference
address: /reference/tools/si-act-mark_lead
contract: 0476e35e6e275db5
---

# tool si.act.mark_lead

Marks a condition on one lead, with a reason where the condition asks for one: The answer gives the lead's new outcome.

[figure: Over MCP, si.act.mark_lead takes MarkLeadInput and returns a card whose body is Outcome.]

The answer gives the lead's new outcome. The call needs the act grant at the strategy rung.



| | |
|---|---|
| input | [MarkLeadInput](/concepts/markleadinput) |
| result | a card whose body is [Outcome](/concepts/outcome) |
| read-only | no |
| destructive | yes |
| card address | `ui://scale-intelligence/cards/Outcome` |
| HTTP route | [`/v1/act/mark_lead`](/reference/act/mark_lead) |





| field | type | required | note |
|---|---|---|---|
| `lead` | `id` | yes |  |
| `condition` | [LeadCondition](/concepts/leadcondition) | yes |  |
| `reason` | `text` | no |  |