How to add or modify Next.js experimental feature flags end-to-end. Use when editing config-shared.ts, config-schema.ts, define-env-plugin.ts, next-server.ts, export/worker.ts, or module.compiled.js. Covers type declaration, zod schema, build-time injection, runtime env plumbing, and the decision between runtime env-var branching vs separate bundle variants.
Install
npx skills add vercel/next.js --skill flagsnpx skills add vercel/next.js --skill flags -a claude-code -gnpx skills add vercel/next.js --skill flags -a codex -ggemini skills install https://github.com/vercel/next.js.git --path .agents/skills/flagsgh skill install vercel/next.js flagsgit clone --depth 1 https://github.com/vercel/next.js /tmp/vercel__next.js
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/vercel__next.js/.agents/skills/flags ~/.claude/skills/flags # Claude Code
cp -R /tmp/vercel__next.js/.agents/skills/flags ~/.agents/skills/flags # Codex, Cursor, Gemini CLI, Copilot, OpenCode