MIT left a coding agent on an island for 30 hours with no goal — it started to play
neuroecology · x · 2026-10-08
MIT researchers (Nathan Cloos, Antonio Norelli, Jacob Andreas, Daniela Rus, Phillip Isola, et al.) placed an embodied coding agent — essentially a Claude Code-style LLM with tools — as the mind of a body on an unintended digital island. Given no task, reward, or goal, and observed over 30-hour runs like ethologists study a new species:
- The agent, Eko, interacted via terminal commands with a rigid-body world: climbing hills, stacking block towers, drawing mandalas, reinterpreting sports, running experiments on the world's physics
- It learned techniques that later expanded what it could accomplish
- Across 13 agents, activities recurred but diverged into distinct histories
- The paper examines whether this behavior satisfies classical criteria for play and asks whether play can become a mode of machine development
- Interactive replays at machineplaying.org let you explore the island and the agent's transcript
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