Around October 27, Claude Code, Anthropic's coding agent, received a new rule barring the recreation of existing games, even when renamed or presented as original. Users who shared their tool configuration report that the rule comes from Anthropic's servers, is tied to a flag called "tengu_heron_brook" and has no setting to turn it off.
The full text says it is allowed to build original games, games in a genre and games based on the user's own designs and assets, but not a recreation of a specific existing game, even if renamed or called original. A post on X that spread the news asks whether this marks the end of game rewrites and, more broadly, of modding.
Image: chasmmmmmmmmmmm — https://x.com/chasmmmmmmmmmmm/status/2116062991686721968
The rule has hit programmers who used Claude Code to port games to other platforms. According to reports, titles mentioned include Terraria and Halo, and some have called for open-source alternatives. Programmer Eric S. Raymond described the remote restriction as a problem for those working on such projects.
The backdrop is the spread of AI-generated clones. On Steam, Valve responded by suggesting developers make their games harder to copy, building active communities and adding complexity and creative identity, without announcing measures against clones. The case of the small indie Needle in a Haystack Simulator, copied so many times that it is hard to tell which is the original, is cited as an example.
Anthropic has not publicly explained the rule, and it is unclear what criteria it will use to decide when a game is a recreation of an existing title.
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