# About ML-Agents Extensions package (`com.unity.ml-agents.extensions`)

The Unity ML-Agents Extensions package optional add-ons to the C# SDK for the
[Unity ML-Agents Toolkit](https://github.com/Unity-Technologies/ml-agents).

These extensions are all considered experimental, and their API or behavior
may change between versions.


## Package contents

The following table describes the package folder structure:

| **Location**     | **Description**                                                        |
| ---------------- | ---------------------------------------------------------------------- |
| _Documentation~_ | Contains the documentation for the Unity package.                      |
| _Editor_         | Contains utilities for Editor windows and drawers.                     |
| _Runtime_        | Contains core C# APIs for integrating ML-Agents into your Unity scene. |
| _Tests_          | Contains the unit tests for the package.                               |

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## Installation

To install this _ML-Agents_ package, follow the instructions in the [Package
Manager documentation](https://docs.unity3d.com/Manual/upm-ui-install.html).


## Requirements

This version of the Unity ML-Agents Extensions package is compatible with the
following versions of the Unity Editor:

- 2018.4 and later

## Known Limitations