Orchestrates migration of ASP.NET Framework (System.Web) MVC and WebAPI projects to ASP.NET Core. Covers only old .NET Framework web projects — not applicable to ASP.NET Core or modern .NET web projects (those are already on the target stack).
Install
npx skills add microsoft/upgrade-agent-plugins --skill migrating-aspnet-framework-to-corenpx skills add microsoft/upgrade-agent-plugins --skill migrating-aspnet-framework-to-core -a claude-code -gnpx skills add microsoft/upgrade-agent-plugins --skill migrating-aspnet-framework-to-core -a codex -ggemini skills install https://github.com/microsoft/upgrade-agent-plugins.git --path plugins/upgrade-agent/upgrade/dotnet/skills/lazy/web/mvc/migrating-aspnet-framework-to-coregh skill install microsoft/upgrade-agent-plugins migrating-aspnet-framework-to-coregit clone --depth 1 https://github.com/microsoft/upgrade-agent-plugins /tmp/microsoft__upgrade-agent-plugins
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/microsoft__upgrade-agent-plugins/plugins/upgrade-agent/upgrade/dotnet/skills/lazy/web/mvc/migrating-aspnet-framework-to-core ~/.claude/skills/migrating-aspnet-framework-to-core # Claude Code
cp -R /tmp/microsoft__upgrade-agent-plugins/plugins/upgrade-agent/upgrade/dotnet/skills/lazy/web/mvc/migrating-aspnet-framework-to-core ~/.agents/skills/migrating-aspnet-framework-to-core # Codex, Cursor, Gemini CLI, Copilot, OpenCode