Anthropic says its Claude Code game rule was also catching games it should have built

Addy Osmani, an Anthropic member of technical staff, posted an update on the rule added to the Opus 5.5 prompt in Claude Code to steer the model away from recreating specific existing games. He writes that last week some users saw Claude Code push back on game projects it should have simply built, and that the rule was also affecting such projects.

Anthropic had confirmed the rule on October 30, saying original games, genre games and games built from a user's own designs and assets were meant to keep working.