modernization

On November 5, 2026 Microsoft added a Windows Arm64 migration scenario to the GitHub Copilot upgrade agent. Here is what the blockers look like in a real .NET project, what the agent can and cannot verify, and how to check the result yourself.

GitHub Copilot's modernize-dotnet agent shipped as a portable plugin on July 9, 2026. It now runs in VS Code, the Copilot CLI, and on GitHub, with an assess to plan to execute workflow whose artifacts get committed to your repo for review.

GitHub Copilot Modernization is pitched as an Assess, Plan, Execute loop for migrating legacy .NET apps. The assessment phase is where the value lives: an inventory report, categorized blockers, and file-level remediation guidance you can diff like code.