Manages deprecation and migration. Use when removing old systems, APIs, or features. Use when migrating users from one implementation to another. Use when deciding whether to maintain or sunset existing code.
Install
npx skills add addyosmani/agent-skills --skill deprecation-and-migrationnpx skills add addyosmani/agent-skills --skill deprecation-and-migration -a claude-code -gnpx skills add addyosmani/agent-skills --skill deprecation-and-migration -a codex -ggemini skills install https://github.com/addyosmani/agent-skills.git --path skills/deprecation-and-migrationgh skill install addyosmani/agent-skills deprecation-and-migrationgit clone --depth 1 https://github.com/addyosmani/agent-skills /tmp/addyosmani__agent-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/addyosmani__agent-skills/skills/deprecation-and-migration ~/.claude/skills/deprecation-and-migration # Claude Code
cp -R /tmp/addyosmani__agent-skills/skills/deprecation-and-migration ~/.agents/skills/deprecation-and-migration # Codex, Cursor, Gemini CLI, Copilot, OpenCode