---
title: "Concepts"
description: "The Concepts section currently covers one thing — surfaces."
---

> Documentation Index
> Fetch the complete documentation index at: https://colmugx.github.io/cetas/llms.txt
> Use this file to discover all available pages before exploring further.

# Concepts

The Concepts section answers "what is it". One page today:
[Surfaces](/cetas/en/concepts/surfaces/) — how the terminal, the editor, and
automation compose the same agent.

Source: https://colmugx.github.io/cetas/en/concepts/index.mdx