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Bluesky reply bot checker

Blog · Watch/Read · (gathered 2026-09-30)

  • Simon Willison has developed a “Bluesky reply bot checker” tool to combat the growing “scourge” of automated reply bots that are migrating from Twitter to Bluesky, polluting conversations with “mindless automated replies.”
  • The tool, “vibe coded” with Opus 5.5, identifies bots by analyzing behavioral signals such as replies posted within seconds, accounts that only reply to high-follower users without original content, and the presence of question marks in their replies.
  • Leveraging Bluesky’s still-available API, the tool provides transparency by displaying every measurement and rule, allowing users to verify the reasoning behind bot detection and see example replies that triggered signals.