> AI agents: this is one page from PostHog's docs. Full index of Markdown docs for LLMs: https://posthog.com/llms.txt

# PostHog Desktop code review

Every task in PostHog Desktop has a built-in **diff panel** for reviewing the agent's changes before they're committed or merged. You can read through edits, leave inline feedback, manage what's staged, and follow up on PR comments – all without leaving the app.

## Opening the diff panel

The diff stats badge in the task header opens the panel. You can also toggle it with `⌘ Cmd` / `⌃ Ctrl` + `⇧ Shift` + `B`.

The panel has two layouts:

-   **Split** – sits beside the task chat, with a draggable divider for resizing
-   **Expanded** – takes over the task view and adds a file tree on the right

![Diff panel in split view next to a task](https://res.cloudinary.com/dmukukwp6/image/upload/Screenshot_2026_04_30_at_1_51_47_PM_2d8dc30419.png)

## Diff sources

The source dropdown in the toolbar controls what you're looking at:

| Source | What it shows |
| --- | --- |
| **Local changes** | Staged and unstaged edits in your working directory |
| **Branch** | The task's branch compared against the default branch |
| **Pull request** | Changes in the linked GitHub PR |

PostHog Desktop picks the most useful source by default based on what's available – local edits if there are any, otherwise the PR or branch.

## Reading diffs

The toolbar's settings menu controls how diffs render:

-   **Unified** or **split** view
-   **Word wrap** for long lines
-   **Word diffs** to highlight character-level changes
-   **Hide whitespace** to ignore whitespace-only changes
-   **Show review comments** to inline GitHub PR comments

Generated files (lock files, minified bundles, `node_modules/`, `dist/`, snapshots) and very large diffs are collapsed by default. Click **Load diff** to expand them.

## Staging and reverting

When viewing local changes, the file list lets you manage your working tree without dropping into a terminal:

-   **Stage** or **unstage** any file
-   **Discard** all edits to a file
-   **Revert** an individual hunk – hover any block in the diff and click **Revert**
-   **Open** a file in your editor or copy its path

![Changes panel with stage, discard, and open actions](https://res.cloudinary.com/dmukukwp6/image/upload/Screenshot_2026_04_30_at_1_53_01_PM_b3b7026703.png)

## Follow up with the agent from the diff

Click the plus button on any line(s) in a diff to open a comment box. Describe the change you want and press `⌘ Cmd` + `⏎ Enter` to send it to the agent. The prompt is sent as a follow-up message on the task, scoped to the file path and line range you selected.

This is the fastest way to ask for tweaks like *"add a null check here"* or *"this branch is unreachable, remove it"* without context-switching back to the chat.

You can send each comment on its own and have the agent address them one at a time, or stack several up and hand them over together. Adding comments to a batch works like leaving review comments on a GitHub PR: the agent picks up all of them in a single follow-up when you submit the review, instead of reacting to each one as you write it.

![Inline comment box on a selected range of diff lines](https://res.cloudinary.com/dmukukwp6/image/upload/Screenshot_2026_04_30_at_1_53_45_PM_b36ff04efd.png)

## GitHub pull requests

When the task has a linked PR, the diff panel doubles as a PR review surface:

-   Existing review comments appear inline next to the code they reference
-   **Reply** posts a response back to GitHub
-   **Fix with agent** sends the comment to the agent with instructions to address it
-   **Ask agent** asks the agent to explain or push back on the comment without making changes

PR status and merge actions live in the task header alongside the diff badge.

![GitHub PR review comment shown inline with Fix and Ask actions](https://res.cloudinary.com/dmukukwp6/image/upload/Screenshot_2026_04_30_at_2_11_04_PM_da25f7ecf7.png)

## Next steps

-   Learn how the [GitHub integration](/docs/posthog-desktop/git-github-integration.md) wires PRs into PostHog Desktop.

### Still have questions?

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