How to review Copilot coding agent changes before merging

How do I review Copilot coding agent changes before merging them

Open the pull request and treat it like any other contributor’s work. Read the diff, inspect the files Copilot touched, and verify the change against your own expectations before you click merge. GitHub says Copilot pull requests deserve the same thorough review as any contribution, and it also says you should check the pull request thoroughly before merging.

Start with intent, not with the comments. Ask what the task was supposed to do, then compare that goal with the branch as it exists now. If Copilot changed several files, read the coordination between them first, because a change that looks correct in one file can break a contract in another. GitHub recommends re-review after substantial changes, especially when multiple files or service boundaries are involved.

Then review the diff line by line. Look for missing edge cases, incorrect assumptions, silent behavior changes, and new dependencies on code that was not part of the task. Copilot can suggest fixes in a couple of clicks, but GitHub also warns that Copilot is not guaranteed to spot all problems and sometimes makes mistakes, so human validation is still required.

Run the code and the tests that matter for the change. If the pull request includes new behavior, reproduce the path manually, not only through unit tests. GitHub’s review guidance says review changes before you merge to catch bugs, missing error handling, and readability issues while the work is still fresh. If the branch fails in a real path but passes a narrow test, the tests are too narrow, not the review.

Check Copilot’s own review comments, but do not stop there. A useful Copilot review can point you to correctness, security, and maintainability issues early, yet the output still needs a human decision. If your repository requires approvals, GitHub notes that your approval of a Copilot pull request will not count toward the required number, so another reviewer still has to approve before merge.

The part people get wrong is accepting the first clean-looking pass. Copilot can fix the obvious problems and still leave a hidden one behind, especially after large edits. GitHub recommends asking for re-review after substantial changes, and also says Copilot only reviews once unless you request it again. That means a branch can become stale after you apply feedback, and the final review needs a fresh look.

Use comments the same way you would with a human author. Ask Copilot to revise specific problems with @copilot, or push your own commits to the branch if that is faster. GitHub documents both paths, and it also documents that you can apply suggested changes directly from the review. The practical rule is simple: if the fix changes behavior, re-check the behavior after the fix lands.

Review repository instructions as part of the change. Copilot reads repository custom instructions, agent instructions, and agent skills from the head branch, not the base branch, so edits to those files can affect the review itself. That is useful when you want to test new conventions in the same pull request, but it also means the review context can shift while you are still evaluating the branch.

Watch the workflows attached to the pull request. GitHub says workflows do not run automatically by default when Copilot pushes changes to a pull request, so you may need to approve and run them. If a workflow is part of your release gate, a clean diff is not enough. The branch is only ready when the code review and the workflow result both match the intended outcome.

A good review sequence is: confirm the task, inspect the diff, check the tests, read the comments, request fixes, and then do one final pass after the last meaningful change. GitHub’s recommended workflow for Copilot reviews follows the same pattern, with early review on draft pull requests and re-review before merge when changes are substantial. That sequence keeps the human decision at the end, where it belongs.

If you want a concrete checklist, use this order every time: what changed, why it changed, what broke, what still needs a test, and whether the branch still matches the original task. That sounds basic, and it is. The value is in doing it after the agent has rewritten the code, not before, because that is where regressions hide and where rushed merges happen.

For teams that review Copilot work often, make draft pull request review part of the habit. GitHub supports automatic review on draft pull requests, automatic review on open, and review on new pushes. Draft review catches obvious issues earlier, and re-review catches the changes that arrived after the first pass. That combination is the closest thing to a reliable merge gate.

If you are building a process around this, keep the review human-facing and keep the checklist short. Do not rely on the agent to approve itself, and do not skip the second pass after fixes. The time you save by merging once is usually spent later debugging a change that looked done but was not. DevConnect follows the same principle for workflow design, meaning real ownership on the branch and no shortcuts around review: https://devconnectplatform.com.

What should I check first in a Copilot pull request

Check the task intent first, then the changed files. That tells you whether the agent solved the right problem before you spend time on implementation details. GitHub’s review docs put emphasis on reviewing the pull request thoroughly, and its code review guidance recommends validating Copilot feedback carefully instead of assuming the output is correct.

Do I need a second review after I ask Copilot to fix something

Yes. After substantial edits, request re-review before merging. GitHub specifically recommends re-review when multiple files changed, when the change touches sensitive behavior, or when you applied a large batch of suggestions. Copilot may only review once unless you ask again, so a second pass is part of the process, not an extra.

Can I approve a Copilot pull request myself if my repository requires approvals

Not always. GitHub says an approval on a Copilot pull request will not count toward required approvals in repositories that require pull request approvals, so another reviewer must approve before merge. That rule matters because it prevents the agent’s author from being the only gate on its own changes.

What if the pull request changes repository instructions too

Review those files as part of the branch, because Copilot reads instructions and skills from the head branch. That means changes to .github/copilot-instructions.md, CLAUDE.md, GEMINI.md, or REVIEW.md can change how the agent behaves on the same pull request. Treat instruction edits like production behavior changes, not like comments.

Should I rely on Copilot review instead of running tests

No. Copilot review helps catch issues early, but GitHub says it is not guaranteed to catch every problem. Run the relevant tests and reproduce the change when the behavior matters. A review comment is feedback, not proof that the branch is safe to merge.