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

# Diff Viewer

When an agent modifies files in your workspace, Mains captures every change and presents them in a built-in diff viewer. You can review exactly what was added, removed, or modified — then decide what to keep, discard, or edit before syncing with your repository.

## **Reviewing Changes**

After an agent session completes work, open the diff viewer to see all modified files. Changes are displayed in a unified diff format with line-by-line highlighting:

* **Green lines** — newly added code
* **Red lines** — removed code
* **File list** — all changed files in a sidebar, grouped by directory

You can navigate between files, expand or collapse context lines, and inspect each change individually.

## **Actions**

The diff viewer guides you through the steps to get your changes merged:

| **Action**    | **Description**                                          |
| ------------- | -------------------------------------------------------- |
| **Accept**    | Keep the change as-is                                    |
| **Discard**   | Revert the file to its original state                    |
| **Commit**    | Commit staged changes with a generated or custom message |
| **Push**      | Push commits to the remote branch                        |
| **Create PR** | Open a pull request directly from the diff viewer        |

## **GitHub Sync**

The diff viewer integrates with GitHub to streamline the merge workflow. After reviewing changes you can commit, push, and open a pull request without leaving Mains. Mains suggests a commit message based on the changes and the agent's session context.

The diff viewer works with any Git repository — GitHub, GitLab repos. The PR creation shortcut requires a GitHub remote.