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Marks a social reply as posted with the live URL. Sets status=‘published’, stamps posted_url + posted_at. Brand resolved from MCP auth context. Use this when:
  • The user has just posted the reply on Reddit/Hacker News/etc. and wants it tracked.
  • A user pastes a comment URL after replying manually.
Skip when:
  • The reply hasn’t been posted yet — use update_reply for status changes that don’t carry a URL.
  • The user wants to undo “posted” status — call update_reply with status=‘scheduled’ or ‘draft’.
The posted_url should be the canonical URL of the live comment, not the source thread URL — Citable uses it for citation attribution.

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