---
title: Develop
description: How the CLI is built, and how to contribute.
status: draft
sidebar:
  order: 4
---

- [architecture](/cli/develop/architecture/) — three layers, the ecosystem crates, fork heritage

Exhaustive API docs belong on docs.rs as the Layer-0 crates publish; the
session transcript format is a stable third-party contract documented in the
repo (docs/reference/transcript-format.md).