Migrates ASP.NET Framework session state, TempData, and application state to ASP.NET Core equivalents. Converts HttpSessionState to ISession with distributed cache backend, migrates TempData from session-based to cookie-based provider, and replaces HttpContext.Application and HttpRuntime.Cache with DI-based IMemoryCache or IDistributedCache.
Install
npx skills add microsoft/upgrade-agent-plugins --skill migrating-mvc-session-statenpx skills add microsoft/upgrade-agent-plugins --skill migrating-mvc-session-state -a claude-code -gnpx skills add microsoft/upgrade-agent-plugins --skill migrating-mvc-session-state -a codex -ggemini skills install https://github.com/microsoft/upgrade-agent-plugins.git --path plugins/upgrade-agent/upgrade/dotnet/skills/lazy/web/mvc/migrating-mvc-session-stategh skill install microsoft/upgrade-agent-plugins migrating-mvc-session-stategit 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-session-state ~/.claude/skills/migrating-mvc-session-state # Claude Code
cp -R /tmp/microsoft__upgrade-agent-plugins/plugins/upgrade-agent/upgrade/dotnet/skills/lazy/web/mvc/migrating-mvc-session-state ~/.agents/skills/migrating-mvc-session-state # Codex, Cursor, Gemini CLI, Copilot, OpenCode