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What it checks

countGraphemes(firstComment.text) <= 300. Same counter and same cap as the post itself, because a first comment is a reply post — Bluesky doesn’t distinguish.

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Failure response

{
  "error": {
    "code": "preflight_failed",
    "rule": "bluesky.first_comment.max_graphemes",
    "platform": "bluesky",
    "message": "First comment text is 312 graphemes; Bluesky allows at most 300."
  }
}

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Remediation

Same as for the parent post — see bluesky.text.max_graphemes for grapheme-aware truncation guidance.