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What it checks

countGraphemes(item.altText) <= 2200.

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Why 2200

Instagram doesn’t publish a distinct alt-text cap in the Graph API; in practice the field accepts up to the same 2200-grapheme limit as the caption. We use the same number rather than guessing tighter.

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Failure response

{
  "error": {
    "code": "preflight_failed",
    "rule": "instagram.media.alt_text_max_graphemes",
    "platform": "instagram",
    "message": "Instagram alt text is capped at 2200 characters."
  }
}

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Remediation

Tighten the description.