Claude Code Loosens a Game Copying Rule So Naming a Game to Describe Mechanics Now Gets an Original Build
An update on building games with Claude Code: Last week some of you ran into Claude Code pushing back on game projects it should have just built. We'd added a short rule to the Opus 5.5 prompt to steer Claude away from recreating specific existing games, but it was also kicking in when you referenced one just to describe the mechanics you wanted. We've updated that rule in 2.1.317. You can name a game to describe what you want and Claude should now build an original game in that genre. If you ask for a copy of the original, it'll offer to build something similar instead. We want Claude to be as helpful as possible when you're building something original, but also to protect your work if someone else tries to copy it. We'll keep improving this, so let us know if Claude turns down work that's yours. Thanks to everyone who shared feedback!
Context
It shows how one short safety rule in a coding agent's prompt can block legitimate work, and how Anthropic is trying to balance helpfulness with not helping people copy someone else's game.
Claude Code is Anthropic's coding agent. Last week Addy Osmani (@addyosmani) said two sentences had been added to Claude Code's prompt on Opus 5.5 to steer it away from recreating someone else's specific game, because using Claude to infringe IP is against Anthropic's usage policy.
Deep dive
Addy Osmani (@addyosmani) posted an update on building games with Claude Code shortly after midnight ET on Nov 4.
He says that last week some users ran into Claude Code pushing back on game projects it should have just built. The team had added a short rule to the Opus 5.5 prompt to steer Claude away from recreating specific existing games, but it was also kicking in when people referenced a game only to describe the mechanics they wanted.
According to the post, the rule was updated in Claude Code version 2.1.317. Users can now name a game to describe what they want, and Claude should build an original game in that genre. If someone asks for a copy of the original game, Claude will offer to build something similar instead.
Osmani says the goal is for Claude to be as helpful as possible when people build something original, while also protecting their work if someone else tries to copy it. He asks users to report cases where Claude turns down work that is theirs.
In his earlier post on Oct 30, Osmani said the original change was two sentences in the prompt, added because using Claude to infringe IP is against Anthropic's usage policy, and that original games, genre games and games built from a user's own designs were meant to keep working. The update post passed 100,000 views.
What to expect next
Watch for whether game developers report fewer refusals after updating to version 2.1.317, and whether new edge cases appear around famous franchises. The episode may push other coding agent makers to explain how they handle requests to recreate existing products. A wider open question is how AI tools should judge when inspiration becomes copying. Anthropic may adjust the rule again based on user reports.