Anthropic updates Claude to 'steer it away' from letting users clone games following weeks of Steam being inundated with AI slop

Anthropic has updated Claude Opus 5.5 to "steer it away" from letting users clone other developers' games, after weeks of Steam being overrun with AI slop and outcries from the game development community. In an update spotted by X user Chasm (via Game Developer ) Anthropic added a new rule to Claude Code's "Rules". Listed under "tengu_heron_brook", the rule

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1. Implementation of Anti-Cloning Rules: Anthropic updated the 'Rules' for Claude Code, introducing a specific directive titled 'tengu_heron_brook' that explicitly forbids the creation of recreations of specific existing games. This change serves as a policy-driven guardrail designed to prevent users from leveraging the model's reverse-engineering capabilities to infringe upon intellectual property.
2. Industry Context and Strategic Rationale: The update follows a significant surge in 'AI slop'—low-effort games frequently cloned from existing titles—which led developers to cancel public demos to protect their code. While platforms like Steam remain hesitant to act as 'gatekeepers' against AI tools, Anthropic's move seeks to balance developer protection with continued support for legitimate creative and genre-based game development.

Sources

• PC Gamer

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