Migrates Azure Functions projects from in-process Startup hooks (FunctionsStartup, IFunctionsHostBuilder) to the isolated worker model with Program.cs service registration. Use when upgrading Azure Functions from in-process to isolated, migrating Startup.cs to Program.cs, removing Microsoft.Azure.Functions.Extensions, or converting FunctionsHostBuilderContext to HostBuilderContext.
Install
npx skills add microsoft/upgrade-agent-plugins --skill migrating-azure-functions-startupnpx skills add microsoft/upgrade-agent-plugins --skill migrating-azure-functions-startup -a claude-code -gnpx skills add microsoft/upgrade-agent-plugins --skill migrating-azure-functions-startup -a codex -ggemini skills install https://github.com/microsoft/upgrade-agent-plugins.git --path plugins/upgrade-agent/upgrade/dotnet/skills/lazy/cloud/migrating-azure-functions-startupgh skill install microsoft/upgrade-agent-plugins migrating-azure-functions-startupgit 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/cloud/migrating-azure-functions-startup ~/.claude/skills/migrating-azure-functions-startup # Claude Code
cp -R /tmp/microsoft__upgrade-agent-plugins/plugins/upgrade-agent/upgrade/dotnet/skills/lazy/cloud/migrating-azure-functions-startup ~/.agents/skills/migrating-azure-functions-startup # Codex, Cursor, Gemini CLI, Copilot, OpenCode