vercel flags evaluations displays feature-flag evaluation charts and bucket data

Introduced 2026-07-20 · score 0.96

HOW TO USE IT

When reviewing a flag’s evaluation distribution, run `vercel flags evaluations <flag>` to view per-variant metrics and charts. Use `--since` and `--granularity` to select the range and bucket size, or `--json` for bucket data and truncation metadata.

WHY THIS HELPS

Inspect a feature flag’s evaluation distribution while debugging or reviewing its behavior.

REQUIREMENTS AND LIMITATIONS

• Version: 56.4.0
• <flag> (required): Feature flag slug or ID.
• --since <TIME>: Start time as a relative duration or ISO 8601 timestamp; defaults to `1h`.
• --granularity <SIZE>: Time bucket size: `1m`, `5m`, `15m`, `1h`, `4h`, or `1d`; defaults to automatic.
• --json: Output exact bucket data as JSON instead of a human-readable summary.
• Prerequisite: Use an installed, authenticated Vercel CLI and target a project; the command defaults to the linked project. CLI installation: `pnpm i -g vercel`.
• Prerequisite: The command was added in Vercel CLI 56.4.0.

FIRST-PARTY EVIDENCE

• https://github.com/vercel/vercel/releases/tag/vercel%4056.4.0
• https://vercel.com/docs/cli/flags
• https://github.com/vercel/flags/blob/main/skills/flags-sdk/references/providers.md

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

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