Anthropic quietly blocks Claude Code from recreating existing video games

A server-side rule now stops the coding tool from cloning specific games, even when users rename or modify them Anthropic has drawn a new line in the sand for Claude Code. The AI coding tool now refuses to recreate specific existing video games, even if a user tweaks the mechanics or slaps a new name on the project. No announcement came with the change. Developers found out the way developers usually find out about these things: by running into it. What the rule actually blocks The restriction was first noted around October 27, 2026. It lives on Anthropic’s servers rather than inside the tool a user installs. The rule is enforced under an internal flag called “tengu_heron_brook.” That flag offers no user-facing toggle, so there is no “I promise this is fine” button to press. The scope is narrower than it might first sound. Claude Code can still help build original games, games within a particular genre, and games based on a user’s own designs. What it won’t do is produce a direct clone of an existing title. Renaming the project or modifying it does not change the answer. Why game studios were nervous The guardrail arrives amid rising concern in the gaming industry about AI-assisted...