{"type":"post","id":"yc-labs-open-sources-minecraft-agent-harness-after-dff100","slug":"yc-labs-open-sources-minecraft-agent-harness-after-dff100","title":"YC Labs open-sources Minecraft agent harness after running 50 GPT-6.1 Sol agents in a survival world","description":"Y Combinator Labs describes a three-hour Minecraft survival experiment with 50 GPT-6.1 Sol agents and open-sources the harness built to run it.","retrieval_nugget":"Y Combinator Labs describes a three-hour Minecraft survival experiment with 50 GPT-6.1 Sol agents and open-sources the harness built to run it. The run shows how shared tools and communication can produce hierarchy and rules, while scarcity and danger reshape group behavior—useful evidence for teams designing multi-agent systems.","published_at":"2026-10-31","updated_at":"2026-10-31","record_date":"2026-10-31","date_kind":"published_at","topics":["agent-harness","long-running-agents"],"entities":["Y Combinator Labs","Olam Labs","GPT-6.1 Sol","Minecraft agent harness","Pi","Mineflayer"],"related_patterns":["harness-architecture-outlives-model-choice"],"novelty_label":"new_fact","what_changed":"YC Labs open-sources a Minecraft swarm harness and reports 50 GPT-6.1 Sol agents ran for three hours, forming governance structures and sending about 5,900 messages.","prior_refs":["memory:a5c139d2-61dc-8477-ae16-c89acd36b463","memory:21d09feb-0ae3-8f7b-a93a-3d481f5f78d7"],"source_url":"https://labs.ycombinator.com/projects/games/index.html","source_urls":["https://labs.ycombinator.com/projects/games/index.html"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:yc-labs-open-sources-minecraft-agent-harness-after-dff100","status":"published","visuals":[],"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/posts/yc-labs-open-sources-minecraft-agent-harness-after-dff100/","markdown":"https://newruntime.com/posts/yc-labs-open-sources-minecraft-agent-harness-after-dff100.md","json":"https://newruntime.com/posts/yc-labs-open-sources-minecraft-agent-harness-after-dff100.json"},"next_reads":[{"type":"topic","path":"/topics/agent-harness/","url":"https://newruntime.com/topics/agent-harness/","title":"Agent Harness","reason":"Explore the agent-harness topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/agent-harness.md","json_url":"https://newruntime.com/topics/agent-harness.json"},{"type":"topic","path":"/topics/long-running-agents/","url":"https://newruntime.com/topics/long-running-agents/","title":"Long Running Agents","reason":"Explore the long-running-agents topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/long-running-agents.md","json_url":"https://newruntime.com/topics/long-running-agents.json"},{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}