Opus 4.6 Roasts Marc Andreessen's System Prompt — Community Shares Claude's Detailed Technical Critique

r/ClaudeAI·low signal

Following the viral mockery of Marc Andreessen's system prompt (which instructed LLMs to 'never hallucinate'), a practitioner fed it to Claude Opus 4.6 for analysis and shared the detailed critique (123 upvotes, 31 comments). Opus systematically identified anti-patterns including contradictory instructions, impossible constraints, and cargo-cult prompt engineering, turning the incident into an educational resource on effective system prompt design.