Vercel Flags is now generally available on all Vercel plans. The v0 team runs hundreds of flags simultaneously, including one that controlled an entire production database migration: two databases stayed in sync, the flag was the cutover, rehearsed in staging, then executed in production without traffic degradation. That is the actual scope of what this tool handles.
The technical distinction that makes this worth reading: flags evaluate server-side via the Flags SDK, integrated natively with Next.js React Server Components and SvelteKit. No client-side round trip, no layout shift, no flicker. For static pages, a Precompute pattern builds all flag variants at build time, distributes them via CDN, and uses Routing Middleware to send each user to the correct variant. Every page stays static. The Flags SDK is open-source and provider-agnostic, with an OpenFeature provider for other frameworks. Flag registration is automatic: define a flag in code, deploy, it appears in the dashboard as a draft. Remove it from code and the dashboard marks it unreferenced.
The full article is worth reading for the v0 rollout playbook specifically: developer sees the feature first, then internal team, then 5%, 10%, 25%, 50% of users at six-hour intervals, with a kill switch available at every stage requiring no redeployment. It also covers AI model traffic shifting, the CLI for agent-native flag management, and the Flags Explorer toolbar override for per-session testing without touching shared configuration.
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