Anthropic has introduced new Claude Code game restrictions designed to prevent its AI coding assistant from recreating existing video games. However, this change is already causing controversy, with some developers reporting that the restrictions also interfere with their own projects.
As first reported Game developerthe new instruction was discovered by X user Chasmwhich claims it was introduced around October 27 via a server-provided configuration identified as tengu_heron_brook.
tengu_heron_brookexplicitly asks Anthropic’s AI coding wizard to support original game development while refusing to recreate specific existing games, even when they are renamed or presented as original projects. Image credit: Gouffre (X)The instruction explicitly tells Claude Code not to recreate specific existing games, even when presented under different names.:
“Do not create a recreation of a specific existing game, even if it is renamed or called original.”
More importantly, this does not represent a blanket ban on AI-assisted game development. Anthropic specifically allows for the creation of original games, projects inspired by existing genres, and games built from users’ own designs and assets.
Anthropic’s Addy Osmani later confirmed the changeexplaining that two sentences had been added to Claude Code’s prompt for Opus 5.5 to discourage intellectual property infringement, which already violates the company’s usage policy.
Osmani also acknowledged the potential for unintended consequences, saying Anthropic would continue to refine restrictions and encourage developers whose own projects were wrongly rejected to report their experiences.
Unfortunately, such complaints have already emerged. In a GitHub issue filed on October 30, a developer exploiting LLC conflict simulations reported that Claude Code had started to refuse to work on personalized digital board game modules ordered by paying customers.
According to the developer, these projects use original code and customer-provided hardware, with the resulting modules intended exclusively for customers who own the corresponding physical games. However, the developer clarified that the work was not officially authorized by the games’ publishers.
Interestingly, the developer claims the denials began only after asking Claude to assess whether the new restrictions applied to the existing project.
In the meantime, Tom’s material reports additional complaints about reverse engineering workflows, although a direct link to game-specific instructions has not been conclusively established.
These developments are particularly relevant to the PC modding community, where AI-assisted coding tools are increasingly used for reverse engineering, optimization, and preservation of games.
For example, we recently covered a Oblivion Remastered performance mod developed with Claude AI, which reportedly improved average frame rates by over 40% while significantly reducing traversal stutter.
New Claude Code gaming restrictions do not explicitly prohibit modding or optimization of existing gamesBut the reported denials raise questions about the tool’s reliability in distinguishing unauthorized recreations from other development activities.
Ultimately, Anthropic faces the challenge of protecting developers’ intellectual property without unnecessarily restricting legitimate uses of its increasingly capable AI coding tools.
Information sources: Chasm (X), game developer and Tom’s Hardware
About the author: Sebastian Castellanos is a trained and trained data scientist. He is also deeply passionate about PC gaming hardware and software. He recently started writing technical articles and guides on Wccftech about PC hardware, gaming and mods.
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