---
title: "tool si.read.chain"
description: "a brand: its roles, its handovers and each handover's count with its instrument."
section: reference
address: /reference/tools/si-read-chain
contract: 0476e35e6e275db5
---

# tool si.read.chain

a brand: its roles, its handovers and each handover's count with its instrument.

[figure: Over MCP, si.read.chain takes MapInput and returns a card whose body is Chain.]

its roles, its handovers and each handover's count with its instrument. The call needs the read grant at the brand rung.



| | |
|---|---|
| input | [MapInput](/concepts/mapinput) |
| result | a card whose body is [Chain](/concepts/chain) |
| read-only | yes |
| destructive | no |
| card address | `ui://scale-intelligence/cards/Chain` |
| HTTP route | [`/v1/read/chain`](/reference/read/chain) |





| field | type | required | note |
|---|---|---|---|
| `brand` | `id` | yes |  |