Vercel has added a new CLI command, 'vercel flags split', that lets you configure weighted traffic splits for Vercel Flags directly from the terminal. You define what percentage of traffic hits each variant without touching the dashboard.
The command runs interactively or accepts inline flags for environment, bucketing attribute, and variant weights. That second option matters: it means splits can be scripted, automated, and version-controlled like any other infrastructure config.
Update to the latest Vercel CLI to use it. The full documentation covers bucketing logic and environment targeting, which is where the real complexity lives and where the read is worth your time.
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