Anthropic adds guardrails to Claude Code to block game cloning

New restrictions on game cloning

Anthropic has officially confirmed that it is implementing new guardrails within its Claude Code tool. These updates are specifically designed to prevent the AI from being used to recreate existing video games. The company wants to ensure that its technology is not used to infringe on the intellectual property of other creators.

The change involves adding two specific sentences to the prompt for the Opus 5.5 model. These instructions tell the AI to avoid building recreations of specific games, even if the user attempts to rename the project or call it an original work. As Tom's Hardware reported, the goal is to steer the AI toward original designs and assets rather than copies of established titles.

Anthropic employee Addy Osmani stated that the firm added these rules to steer the model away from infringing on IP. He noted that the company is currently iterating on these rules to find the right balance. The intent is to allow developers to continue working on original games while blocking the unauthorized duplication of existing software.

Impact on reverse engineering

Beyond game development, users are reporting that the new limitations are affecting reverse engineering tasks. Reverse engineering is the process of deconstructing software to see how it works. Some developers have noted that tasks they could perform previously are now being blocked by the AI's safety filters.

One developer reported that his software checks worked perfectly until October 31. After that date, the tasks were blocked on the Opus 5.5 model but continued to work when he switched to the older Opus 4.8 model. This suggests that the restrictions might be tied specifically to the newer model's updated instructions.

Other reports indicate that the AI is now refusing requests to reverse engineer product activations. These refusals appear to be part of a broader effort to manage cybersecurity-related rules. The company may be tightening these controls to prevent the tool from being used for potentially malicious software analysis.

Developer community pushback

The software development community has reacted with significant criticism to these new restrictions. Many users have expressed frustration on social media and within the Claude Code GitHub repository. Some developers argue that the AI is becoming too restrictive and is refusing to work on legitimate projects.

Complaints have surfaced from users who feel the AI is being over-cautious. Some individuals even reported that their accounts were temporarily suspended for using tools intended for reverse engineering. These incidents highlight the tension between safety protocols and the practical needs of software engineers who use AI for complex tasks.

The community is currently monitoring how these rules affect different types of work. While the company aims to protect intellectual property, some developers feel the guardrails are hindering their ability to experiment. The ongoing conversation focuses on where the line should be drawn between helpful assistance and prohibited activity.

Bypassing the new limits

For users who find the new restrictions too limiting, there may be ways to continue their work. The current blocking appears to be specific to the combination of Claude Code and the Opus 5.5 model. This means that the limitations might not apply if the model is accessed through different methods.

Some users have suggested using different harnesses, such as Ollama, to interact with the model. Alternatively, forwarding specific requests through a wrapper might allow users to sidestep the specific prompt instructions added by Anthropic. These methods would allow developers to use the model's capabilities without the specific game-cloning guardrails.

The situation remains fluid as Anthropic continues to iterate on its rules. Developers are currently observing how often these blocks occur and which models remain the most permissive. For now, the most direct way to avoid the new limits is to use older model versions that do not have the updated prompt sentences.

The Cyber Verification Program

Anthropic maintains an ongoing Cyber Verification Program to manage how its frontier models are used for security tasks. Under this program, only approved entities are granted access to the full set of cybersecurity capabilities provided by the models. This suggests that the general public may face more restrictions than verified organizations.

The recent changes to Claude Code likely reflect a broader strategy to manage these risks. By adding guardrails to the most accessible versions of the model, the company aims to prevent widespread misuse. This is a common practice for AI companies trying to balance utility with safety and legal compliance.

Moving forward, the company will likely continue to refine these rules based on user feedback and safety reports. The goal is to create a system where developers can build new things without accidentally violating the rights of others. Watch for further updates as Anthropic adjusts the balance between creative freedom and intellectual property protection.