Migrating Mvc System Web Adapters

MicrosoftOfficial

Provides System.Web Adapters overlay guidance for incremental ASP.NET Framework to ASP.NET Core migration. Installs Microsoft.AspNetCore.SystemWebAdapters compatibility shims so System.Web API patterns (HttpContext.Current, HttpModules, HttpHandlers, Session, ClaimsPrincipal.Current) continue working in ASP.NET Core during the migrate phase, then guides ordered decommission of each shim.

Install

npx skills add microsoft/upgrade-agent-plugins --skill migrating-mvc-system-web-adapters

npx skills add microsoft/upgrade-agent-plugins --skill migrating-mvc-system-web-adapters -a claude-code -g

npx skills add microsoft/upgrade-agent-plugins --skill migrating-mvc-system-web-adapters -a codex -g

gemini skills install https://github.com/microsoft/upgrade-agent-plugins.git --path plugins/upgrade-agent/upgrade/dotnet/skills/lazy/web/mvc/migrating-mvc-system-web-adapters

gh skill install microsoft/upgrade-agent-plugins migrating-mvc-system-web-adapters

git 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-mvc-system-web-adapters ~/.claude/skills/migrating-mvc-system-web-adapters   # Claude Code
cp -R /tmp/microsoft__upgrade-agent-plugins/plugins/upgrade-agent/upgrade/dotnet/skills/lazy/web/mvc/migrating-mvc-system-web-adapters ~/.agents/skills/migrating-mvc-system-web-adapters   # Codex, Cursor, Gemini CLI, Copilot, OpenCode

Install

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