Review Changes

Last updated October 31, 2026

Before every answer in a project, Classgrid takes a snapshot of your code. So in Studio Mode you can see exactly what the agent changed, and put any file back the way it was.

The "files changed" box

Under each answer that changed files, you'll see a box like:

3 files changed +42 -7

+x -y is lines added and lines removed.
Click the box to list the files. Click a file name to open it in the Files tab.

After you review, the box shows what you chose: Changes rejected, 3 files changed · kept, or 3 files changed · 1 rejected (rejected files are struck through).

The Review tab

Open the Review tab in the pane (or choose Overview → Review). It shows the changes from one answer at a time.

Part	What it does
Answer picker	Choose which answer to look at: Newest answer, or Answer N of M. Each shows its status: Kept, Rejected or Undone
N files +a -r	Total files and lines changed in that answer
Reject all	Puts every file in that answer back as it was
Accept all	Marks the answer as kept
Find	Search inside the changes
Files changed list	Click a file to jump to it. Hide or show the list with its button
Refresh	Loads the changes again

Each changed file opens as its own section, showing removed lines and added lines with their line numbers. Unchanged parts fold into "⋯ N unchanged lines"; click to unfold.

The Review tab refreshes by itself a moment after the agent changes files.

View options (⋮)

Option	What it does
View split diff	Shows Before and After side by side
Hide whitespace changes	Ignores changes that are only spaces
Expand all / Collapse all	Opens or closes every file
Collapse unchanged lines	Folds the lines that didn't change

Your choices are remembered.

Find in the changes

Click Find and type. Turn on Aa (match case), ab (whole word) or .* (regular expression) if you need them. Matches are highlighted, with "X of Y" showing where you are.

Enter: next match
Shift+Enter: previous match
Esc: close

Keep or reject

Reject one file

Open the file's section and click Reject file. Confirm:

"The agent's changes to [file] will be thrown away and the file put back as it was before this answer."

Reject a whole answer

Click Reject all and confirm:

"All of this answer's changes will be thrown away and every file put back as it was before this answer."

Files the agent created in that answer are removed.

Rejecting can't be undone. Read the change before you reject it.

Accept all

Accept all marks the answer as kept ("Changes kept"). It doesn't save anything to GitHub. To save your work, click Push in the tab bar. See Pull requests and backups.

Undo a whole answer

Undo puts the whole project back to how it was before an answer, including any later changes. In Studio, do it from Project Mode:

Hide the pane, then click Open at the top right of the chat. The chat opens in Project Mode.
Click Undo in the answer's files changed box, and confirm.

See Review and undo for how Undo works.

If you only want to remove some files, use Reject file in the Review tab instead.

When changes can't be reviewed

Snapshots are kept while your project's code is ready on Classgrid. After you leave Studio for about 30 minutes, the working copy is removed, and the next time the project downloads fresh from GitHub. Older answers then can't be reviewed or rejected: "This answer's changes can't be reviewed anymore."

The Review tab also lists only the answers you've seen since you last opened the page. Push your work before you leave.

A good routine

Ask the agent for a change.
Open Review and read each file.
Reject file for anything you don't want.
Ask: "Run the build and fix any errors."
Click Push to save to GitHub.