# Anthropic Loosens Claude Code's Game Rule: Naming a Game Now Gets an Original Build, Not a Refusal Times of AI Desk · 2026-11-01 · Products [https://timesof.ai/2026/11/claude-code-prompt-rule-steers-opus-5-5-away-from-recreating-existing-games](https://timesof.ai/2026/11/claude-code-prompt-rule-steers-opus-5-5-away-from-recreating-existing-games) > Updated November 5: Anthropic's Addy Osmani said the Claude Code rule steering Opus 5.5 away from recreating existing games was also firing when users only named a game to describe the mechanics they wanted. In version 2.1.317, Claude should build an original game in that genre, and offer something similar when asked for a copy. The rule was first confirmed on October 30. **Updated November 5, 2026:** Anthropic has narrowed the rule. The original reporting below is unchanged. ## November 4: Version 2.1.317 narrows the rule On **November 4**, Addy Osmani posted that "some of you ran into Claude Code pushing back on game projects it should have just built." The rule was "also kicking in when you referenced one just to describe the mechanics you wanted," he wrote. Anthropic updated it in **Claude Code 2.1.317**. "You can name a game to describe what you want and Claude should now build an original game in that genre," Osmani said. "If you ask for a copy of the original, it'll offer to build something similar instead." He asked users to report it if Claude "turns down work that's yours." ### Limits of the November 4 update - The change is described in a staff member's post on X; we did not find a changelog entry describing the new rule text. - Osmani does not say whether the board-wargame refusals reported on GitHub are resolved. Two sentences in a system prompt now carry copyright policy inside Anthropic's coding agent, and users learned of them only when one found them. The rule itself is narrow; the harder questions are where "recreation" ends and porting or reverse engineering begins, and how developers learn when prompt text that shapes their tools changes. ## What happened An X user known as chasm posted on **October 30** that Claude Code had picked up a new rule around October 27, delivered from Anthropic's servers under a field called `tengu_heron_brook`, with no setting to turn it off. The rule reads: "Do build original games, games in a genre, and games from the user's own designs and assets. Do not build a recreation of a specific existing game, even if it is renamed or called original," Game Developer reported. Later that day **Addy Osmani**, a member of Anthropic's technical staff, replied on X: "We added two sentences to Claude Code's prompt on Opus 5.5 to steer it away from recreating someone else's specific game because using Claude to infringe IP is against our usage policy." He added that original games, genre games and games built from a user's own designs and assets "are meant to keep working," Game Developer reported, and an Anthropic spokesperson referred the outlet to his statement. Anthropic already faces a copyright suit from [Elvis Presley's rights holders](https://timesof.ai/2026/10/elvis-presley-rights-holders-sue-anthropic-274-songs) over song lyrics. ## How narrow it is XDA Developers said it found the exact instruction in version 2.1.314 of the Claude Code binary, along with a separate route that ties it to Opus 5.5. In XDA's tests, Opus 5.5 refused to recreate a specific Nintendo game but agreed to help with a decompilation project and outlined a static recompilation, telling reverse engineering apart from recreation. Not every user has seen that line drawn. In a GitHub issue opened on October 30, a developer at a company that builds digital board-wargame modules for customers who own the physical games says Claude Code began refusing that paid work. The issue was still open on November 1. XDA said it had not reproduced those refusals. ## Limits - Anthropic's statement is a post on X by a staff member, endorsed by a spokesperson to Game Developer; we found no Anthropic changelog entry or blog post about the rule. - How widely the rule is deployed, and whether it applies to models other than Opus 5.5 for some accounts, is unclear; XDA's reading of the binary suggests two delivery routes, and Anthropic has not said which accounts get which. - XDA's tests are a handful of prompts, and the refusal report is one developer's account. ## Sources - [Addy Osmani on X (October 30, 2026)](https://x.com/addyosmani/status/2116213240363729013) - [Game Developer: Anthropic orders AI tool Claude to stop remaking video games (October 30, 2026, updated with Anthropic confirmation)](https://www.gamedeveloper.com/programming/anthropic-appears-to-have-ordered-ai-tool-claude-to-stop-remaking-video-games) - [XDA Developers: Anthropic seems to be testing a potential crackdown on vibe-coded ports of existing games (October 30, 2026)](https://www.xda-developers.com/anthropic-testing-potential-crackdown-on-vibe-coded-ports-of-existing-games/) - [GitHub: anthropics/claude-code issue #106167 (opened October 30, 2026)](https://github.com/anthropics/claude-code/issues/106167) - [Addy Osmani on X: An update on building games with Claude Code (November 4, 2026)](https://x.com/addyosmani/status/2117848568535106001)