The headline is a new Agent option in Copilot Chat's picker, built on the same SDK that powers the Copilot CLI. GitHub says it gets more tasks right the first time and keeps its answers short enough to scan — a welcome change if you've watched the old chat pad every reply. Around it are three smaller wins: skills authored by the .NET and Azure teams ship in the box, a right-click Copilot Actions > Review Selection gives you inline review on a highlighted block, and organization owners can now set custom instructions once for everyone instead of asking each developer to configure their own.