> ## Documentation Index
> Fetch the complete documentation index at: https://alto.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

Alto was designed to be extraordinarily lightweight — that way, users can focus on
writing their core code rather than fiddling with their cloud environments.

One of the main concepts in Alto is **agents**. Agents are custom runtime environments
in the cloud. The configuration for agents is defined in a
[YAML](/agents/configuration/v0.0.8/jinja_yaml) file, and it's designed to be (mostly)
cloud-agnostic. That is, the configuration file shouldn't change dramatically whether
you're running your code on an EC2 instance, a EMR cluster, or a GCP virtual machine.

<Note>
  Agents are currently configured using YAML. In the future, users will be able to
  express agent and image configurations entirely in code.
</Note>

Alto currently supports the following agents:

* [EC2](/agents/configuration/v0.0.8/infra/ec2)

We're just getting started, so please let us know if you use a cloud environment that
isn't current supported!