---
title: "tool si.read.model_families"
description: "Reads the model families that fit a vertical or a representation: Each family arrives with what it represents, the substrate it is written over, its solver and its check."
section: reference
address: /reference/tools/si-read-model_families
contract: 0476e35e6e275db5
---

# tool si.read.model_families

Reads the model families that fit a vertical or a representation: Each family arrives with what it represents, the substrate it is written over, its solver and its check.

[figure: Over MCP, si.read.model_families takes ModelFamiliesInput and returns a card whose body is [ModelFamily].]

Each family arrives with what it represents, the substrate it is written over, its solver and its check. The call needs the read grant at the tenant rung.



| | |
|---|---|
| input | [ModelFamiliesInput](/concepts/modelfamiliesinput) |
| result | a card whose body is [ModelFamily](/concepts/modelfamily) |
| read-only | yes |
| destructive | no |
| card address | `ui://scale-intelligence/cards/ModelFamily` |
| HTTP route | [`/v1/read/model_families`](/reference/read/model_families) |





| field | type | required | note |
|---|---|---|---|
| `vertical` | `id` | no |  |
| `representation` | `one of stocks and flows \| a graph of participants and handovers \| a hypergraph of co-presence \| agents with behaviours \| a game of roles` | no |  |