tl;dr: Researchers deployed 50 GPT-6.1 agents into a survival Minecraft world with the goal of building a civilization, using an open-sourced harness built on Mineflayer. The agents spontaneously formed a hierarchy (with the first-listed agent, Ada, becoming leader), established a government with written rules and permits, and built a fishing-based food rationing system coordinated via shared markdown files. After 22 deaths on the first night, the swarm became increasingly risk-averse, abandoning ambitious projects and huddling in shelters rather than pursuing the original civilization-building goal.