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

# Image helpers reference

> Build the standard workspace and controller images.

## Image helpers

These helpers return standard
[`modal.Image` objects](https://modal.com/docs/sdk/py/latest/modal.Image). Use Modal's
[Images guide](https://modal.com/docs/guide/images) for general image operations.

| API                           | Use                                                |
| ----------------------------- | -------------------------------------------------- |
| `worker.base_image()`         | Start a customizable Devin workspace image         |
| `worker.prepare_image(image)` | Finish the image after all custom build operations |
| `worker.controller_image()`   | Supply the generated scheduler image               |

Most applications customize only `base_image()` and leave the generated controller
image unchanged.

## Standard workspace contents

`base_image()` includes:

* Git, curl, CA certificates, tar, and the Devin CLI.
* `/root/workspace` as the managed working directory.
* FFmpeg by default for screen recording.
* Chromium by default for browser and computer-use features.

Disable `install_ffmpeg` or `install_chrome` when the corresponding feature is
unneeded.