---
title: "tool si.read.compare"
description: "two brands, a question from the closed list of comparisons: two summaries over one structure, each with its coverage."
section: reference
address: /reference/tools/si-read-compare
contract: 0476e35e6e275db5
---

# tool si.read.compare

two brands, a question from the closed list of comparisons: two summaries over one structure, each with its coverage.

[figure: Over MCP, si.read.compare takes CompareInput and returns a card whose body is Comparison.]

two summaries over one structure, each with its coverage. The call needs the read grant at the brand rung.



| | |
|---|---|
| input | [CompareInput](/concepts/compareinput) |
| result | a card whose body is [Comparison](/concepts/comparison) |
| read-only | yes |
| destructive | no |
| card address | `ui://scale-intelligence/cards/Comparison` |
| HTTP route | [`/v1/read/compare`](/reference/read/compare) |





| field | type | required | note |
|---|---|---|---|
| `first` | `id` | yes |  |
| `second` | `id` | yes |  |
| `question` | [ComparisonQuestion](/concepts/comparisonquestion) | yes |  |