vercel flags set changes served variant in an environment

Introduced 2026-03-11 · score 0.94

HOW TO USE IT

When changing the variant served by a flag in an environment, run `vercel flags set` with the flag, environment, and variant. Select the variant by ID or value; boolean `enable`/`disable` shortcuts apply only to boolean flags.

WHY THIS HELPS

Change which feature flag variant is served in a Vercel environment.

REQUIREMENTS AND LIMITATIONS

• Version: 50.31.2
• <flag> (required): Feature flag slug or ID.
• --environment, -e (required): Target environment: production, preview, or development.
• --variant, -v (required): Selects a variant by ID or value; labels are not selectors.
• --message: Optional revision message.
• Prerequisite: Vercel CLI must be installed and authenticated to access or administer Vercel resources.
• Explicit variant selection matches by ID or value only.

FIRST-PARTY EVIDENCE

• https://github.com/vercel/vercel/blob/main/packages/cli/CHANGELOG.md#50312
• https://vercel.com/docs/cli/flags
• https://vercel.com/docs/cli

Check the installed version and the source before using it. Entry JSON

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