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

# app_extension

Prebuilt extensions to [customize Atoti UI](../guides/extending_the_app#ui-app-extension).

<h3 id="atoti.app_extension.ADVANCED_APP_EXTENSION">
  ADVANCED\_APP\_EXTENSION
</h3>

> atoti.app\_extension.ADVANCED\_APP\_EXTENSION: [Mapping](https://docs.python.org/3/library/collections.abc.html#collections.abc.Mapping)\[[str](https://docs.python.org/3/library/stdtypes.html#str), [Path](https://docs.python.org/3/library/pathlib.html#pathlib.Path)]

The `{name: path}` of an extension providing the following features:

* MDX editor
* Context values editor
* State editor
* Text editor widget