GitHub announced on August 27, 2026 that Copilot code review can now automatically review bot-authored pull requests and very large pull requests that were previously outside its limits. Pull requests opened by Copilot cloud agent can also receive a full agentic review instead of the earlier limited fallback.
The update also adds structured reasons when resolving a Copilot review comment: Addressed, Won’t fix, or Incorrect. That gives teams a simple way to distinguish accepted findings from deliberate exceptions and false positives.
What changed in Copilot code review
- Large-PR limit removed: GitHub says the previous cap of 300 files or 20,000 lines of code no longer applies.
- Bot-authored PRs: automatic review can cover bot-created pull requests when the organization enables the policy that allows code review without a Copilot license.
- Cloud-agent PRs: automatically requested reviews on Copilot cloud-agent pull requests can now use the full agentic review experience.
- Resolution feedback: reviewers can classify a resolved comment as Addressed, Won’t fix, or Incorrect.
Why this matters for QA engineers
Copilot code review for large pull requests closes a coverage gap in repositories where dependency bots, migration tools, generators, or coding agents create changes at a scale that previously exceeded the product’s review boundary. It does not make oversized changes easier for humans to understand, however.
- Measure signal at scale: compare actionable defects, duplicate comments, false positives, review duration, AI-credit use, and Actions minutes across representative small and large PRs.
- Keep human review: GitHub’s documentation says Copilot can miss issues and make mistakes, and explicitly recommends validating its feedback and supplementing it with human review.
- Check policy and billing: reviews for users or bots without a qualifying license require organization settings and paid AI-credit usage. Budget exhaustion can block reviews.
- Use resolution reasons consistently: define when reviewers should choose Incorrect versus Won’t fix so feedback data does not blur false positives with accepted risk.
- Do not hide change risk: retain PR-size guidance, test gates, ownership checks, and incremental delivery practices even though the product limit is gone.
A practical validation plan
- Select bot-authored, cloud-agent, and large human-authored PRs from a non-production test repository.
- Confirm automatic review triggers for draft, open, and new-push states match repository settings.
- Seed known functional, security, and test-coverage defects, then record detection and false-positive rates.
- Verify review behavior when GitHub-hosted runners are disabled or unavailable; GitHub documents a limited-review fallback.
- Track AI credits and Actions minutes, especially for large diffs and Balanced-effort reviews.
- Audit a sample of Addressed, Won’t fix, and Incorrect resolutions for consistent team usage.
Bottom line
GitHub has expanded the surface that Copilot can review, including automation-generated and unusually large changes. QA teams should treat that as wider automated coverage—not as permission to merge giant PRs or remove human oversight—and should baseline quality, cost, and fallback behavior before enabling it broadly.
Sources
- GitHub Changelog: Copilot code review — resolution reasons and expanded capabilities — August 27, 2026
- GitHub Docs: About GitHub Copilot code review — accessed August 30, 2026