GitHub changed Copilot code review from a file-reading reviewer into an agent that can run builds, tests, targeted scripts, tools and APIs behind the Copilot agent firewall. Lite reviews now use an ensemble of agents and merge their findings into one review. GitHub reports 47% more addressed high-severity comments, 31% more medium-severity comments and about 8% lower review cost in its experiments. Copilot also auto-resolves addressed threads and writes commit messages for applied fixes.
GitHub upgrades Copilot review with shell tools and an agent ensemble
2026-09-12Verified announcementTRIAL
GitHub changed Copilot code review from a file-reading reviewer into an agent that can run builds, tests, targeted scripts, tools and APIs behind the Copilot agent firewall. Lite reviews now use an ensemble of agents and merge their findings into one review. GitHub reports 47% more addressed high-severity comments, 31% more medium-severity comments and about 8% lower review cost in its experiments. Copilot also auto-resolves addressed threads and writes commit messages for applied fixes.
Official · AnnouncementCopilot code review API support and new default effortReferencegithub.blog · 2026 09 11 auto resolution and analysis updates in copilot code review
Imported from the existing research archive. Migration preserves the recorded judgment and is not a fresh verification.
What this means for you
For teams already using Copilot review, validation is moving from static inspection toward execution-backed review without requiring the highest effort tier. Trial it on repositories with reliable tests and compare high-severity precision, runtime and false positives against the previous Lite baseline.
Evidence & related material
GitHub now lets REST and GraphQL clients request Copilot code review and set effort per request.
Subsequent changes
Copilot code review adds REST and GraphQL access with per-request effort.
Technical details & scores
| Review Runtime | Full Copilot SDK shell-tool set behind the Copilot agent firewall; can run builds, tests, targeted scripts, and query available tools/APIs |
|---|---|
| Lite Ensemble | Multiple review agents contribute perspectives and GitHub merges their findings into one Lite review |
| Vendor Experiment | +47% addressed high-severity comments; +31% medium; +11% low; review cost about -8% |
| Workflow | Auto-resolves comments after a later commit addresses them; generates context-specific commit messages for applied suggestions |
Technical impact 3
Engineering value 4
Adoption signal 4
Maturity 4
Verification cost 2
Risk 2