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On October 30, 2026, commenting on the new restrictions added to Claude Code, Peter Steinberger said that this was yet another reason to use your own harness rather than one whose permission scope the company can change at will. Earlier posts said that around October 27, Claude Code pushed down a rule named "tengu_heron_brook" via Anthropic's servers that could not be turned off: original games could be built, but specific existing games must not be replicated. Subsequent reports said that Anthropic enforced the restriction through this server-side switch, prohibiting replication of specific existing games even if renamed or claimed to be original, while the rule still allowed original games, games of the same genre, and projects based on users' own designs and assets; Anthropic technical staff member Addy Osmani responded that two lines of guidance had been added to the Claude Code prompt, and emphasized that using Claude to infringe intellectual property violates the platform's usage policy, and that the restriction is currently explicitly targeted only at Claude Code in the Opus 5.5 model.
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2 confirmed developments
- Source:Peter Steinberger
Anthropic restricts Claude from generating recreations of existing games via a server-side switch
Source:Rohan Paul
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Oct 31
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Anthropic restricts Opus 5.5 in Claude Code from replicating existing games
Anthropic has restricted the Opus 5.5 model in its AI coding tool Claude Code from helping users replicate specific existing games. Developer @chasmmmmmmmmmmm said that around October 27, Claude Code added a rule that cannot be disabled: users may create original games, games of a certain genre, and games based on their own designs and assets, but may not replicate a specific existing game, even if renamed or claimed to be original. Anthropic technical staff member Addy Osmani responded that two lines of guidance have been added to the Claude Code prompt, and emphasized that using Claude to infringe intellectual property violates the platform's usage policy; currently, this restriction explicitly targets only Claude Code in the Opus 5.5 model.
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Oct 30
Rohan Paul
Anthropic restricts Claude Code from recreating existing games via a server-side switch
Anthropic delivers rules to Claude Code via a server-side switch named tengu_heron_brook, prohibiting the recreation of specific existing games, even if renamed or claimed to be original, and there is no option to turn it off. The rules still allow original games, games in the same genre, and projects based on the user's own designs and assets. The author believes that at the implementation level, its weapon jailbreak classifier stack can be reused; the difficulty lies in the fact that copyright only protects a game's look and feel rather than its mechanics, so the detector needs to distinguish between the same genre and the same game.
Peter Steinberger
Peter Steinberger on Claude Code's new rule: you should build your own harness
A post claims that around October 27, Claude Code pushed down a new rule named "tengu_heron_brook" via Anthropic's servers, and it cannot be turned off: you can build original games, but you must not recreate a specific existing game. Commenting on this, Peter Steinberger said this is yet another reason to use your own harness rather than one whose permission scope a company can change at will.
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