Anthropic introduced a new Claude Code instruction aimed at preventing its AI coding assistant from recreating existing video games. The change, reported to have arrived around October 27 via a server-delivered configuration, has already prompted complaints from some developers who say it is interfering with their own projects, according to the report.
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Illustrative image · Source: Wccftech · Anthropic Adds Claude Code Restrictions on Recreating Existing Games, Drawing Developer Complaints · Rights unverified · Reencoded as WebP with metadata removed. Display may be resized or cropped.
Anthropic has introduced new Claude Code game restrictions intended to stop its AI coding assistant from recreating existing video games, and the change is already generating controversy, with some developers reporting that the restrictions are also interfering with their own projects. As first reported by Game Developer, the instruction was discovered by X user Chasm, who claims it was introduced around October 27 through a server-delivered configuration identified as tengu_heron_brook.
The configuration entry instructs the assistant to support original game development while refusing to recreate specific existing games, even when they are renamed or presented as original projects. The report states this is not a blanket prohibition on AI-assisted game development: Anthropic specifically allows original games, projects inspired by existing genres, and games built using users' own designs and assets. Anthropic's Addy Osmani reportedly confirmed the change, saying two sentences had been added to Claude Code's prompt for Opus 5.5 to discourage intellectual property infringement, which he said already violates the company's usage policy.
Osmani also acknowledged the potential for unintended consequences, saying Anthropic would continue refining the restrictions and encouraging developers whose own projects were incorrectly rejected to report their experiences. Such complaints have already emerged: in a GitHub issue filed on October 30, a developer operating Conflict Simulations LLC reported that Claude Code had started refusing to work on personalized digital board-wargame modules commissioned by paying customers, which the developer said use original code and customer-supplied materials, with modules intended exclusively for customers who own the corresponding physical games; the developer clarified the work isn't officially licensed by the games' publishers. The developer claims the refusals began only after asking Claude to evaluate whether the new restrictions applied to the existing project.
Tom's Hardware reports additional complaints involving reverse-engineering workflows, although the report says a direct connection to the game-specific instruction hasn't been conclusively established. These developments are described as particularly relevant to the PC modding community, where AI-assisted coding tools have increasingly been used for reverse engineering, optimization, and game preservation. The new restrictions don't explicitly prohibit modding or optimizing existing games, but the reported refusals raise questions about how reliably the tool can distinguish unauthorized recreations from other development activities.
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