Anthropic has introduced new instructions restricting its Claude Code AI coding assistant from recreating specific existing video games, even when developers rename the projects or describe them as original creations. The company has confirmed that the change is intended to prevent intellectual property infringement while continuing to support original game development.
The restriction became publicly documented on October 30, 2026, after X user Chasm identified an instruction reportedly introduced around October 27 through a Claude Code configuration mechanism called “tengu_heron_brook.” The instruction explicitly permits original games, projects within established genres, and games based on users’ own designs and assets. However, it directs Claude Code not to recreate a particular existing game, regardless of whether the resulting project uses a different name.
Anthropic subsequently confirmed the change through a statement from Addy Osmani, a member of the company’s technical staff. Osmani explained that two sentences had been added to Claude Code’s prompt for Opus 5.5 to discourage reproductions of existing games because using Claude to infringe intellectual property rights violates Anthropic’s usage policy.
Osmani also clarified that original games, genre-based projects, and games developed using users’ own designs and assets should remain supported. Anthropic intends to refine the restriction and has invited developers to report cases where Claude incorrectly refuses work involving their own creations.
The distinction is significant for developers using AI assistants to build games. Creating an original platformer or a role-playing game inspired by common genre conventions remains within the stated boundaries. Asking Claude Code to reproduce a specific commercial game, even under a different title, is the activity the new instruction targets.
However, the restriction has already prompted complaints from developers working on projects they consider legitimate.
A GitHub issue opened on October 30 by a developer associated with Conflict Simulations LLC describes Claude Code refusing professional development work involving digital adaptations of board wargames. The developer says the business creates custom modules for clients using materials those clients provide, with original code written from scratch rather than copied from existing software.
The complaint raises questions about how Claude distinguishes an unauthorized recreation from work involving client-supplied materials or authorized adaptations. The developer’s account does not independently establish the legal status of every project, but it demonstrates the potential consequences of incorrect refusals for commercial development workflows.
Other users have reported difficulties with reverse-engineering and troubleshooting requests that they describe as unrelated to copyright infringement. These complaints suggest the instruction may sometimes affect tasks beyond direct game cloning, although they do not establish that Anthropic has introduced a blanket prohibition on reverse engineering or software analysis.
The scope of the change also remains important. Anthropic specifically confirmed the instruction for Opus 5.5 in Claude Code. Reports concerning server-delivered configurations suggest it may reach other Claude Code sessions, but the available evidence does not establish that every model and user receives identical restrictions.
The development comes as AI-assisted programming becomes increasingly integrated into commercial game production. Epic Games has discussed using Claude Code and other AI coding tools in Unreal Engine 6 and Fortnite development, demonstrating how these assistants are being incorporated into established game-engine workflows.
Questions surrounding AI-generated game adaptations have also emerged within fan-development communities. The developers behind Banjo: Recompiled recently criticized an AI-assisted Banjo-Tooie PC port, raising concerns about code quality and the use of existing community tooling. That dispute illustrates the broader challenges surrounding AI-assisted recreation projects, although it is separate from Anthropic’s new restrictions.
Anthropic has not announced a general ban on game development through Claude Code. Its confirmed change is narrower, targeting recreations of identifiable existing games while preserving support for original projects.
For developers working on remakes, licensed adaptations, reverse-engineering projects, or software compatibility tools, the remaining uncertainty concerns how consistently Claude Code distinguishes legitimate work from prohibited recreation. Anthropic has acknowledged the possibility of incorrect refusals and says it will continue adjusting the instructions.
