---
title: "tool si.ask.facts"
description: "a unit or a population, the date it was true, and the date we knew it, as two parameters."
section: reference
address: /reference/tools/si-ask-facts
contract: 0476e35e6e275db5
---

# tool si.ask.facts

a unit or a population, the date it was true, and the date we knew it, as two parameters.

[figure: Over MCP, si.ask.facts takes FactsInput and returns a card whose body is FactsAnswer.]

the facts, and the tier that gave them. The call needs the ask grant at the strategy rung.



| | |
|---|---|
| input | [FactsInput](/concepts/factsinput) |
| result | a card whose body is [FactsAnswer](/concepts/factsanswer) |
| read-only | yes |
| destructive | no |
| card address | `ui://scale-intelligence/cards/FactsAnswer` |
| HTTP route | [`/v1/ask/facts`](/reference/ask/facts) |





| field | type | required | note |
|---|---|---|---|
| `unit` | [UnitRef](/concepts/unitref) | no |  |
| `population` | [Predicate](/concepts/predicate) | no |  |
| `attributes` | `[text]` | no |  |