Microsoft open-sourced Agensh, a decentralized framework enabling 1,024 coding agents to work independently without a central orchestrator, significantly scaling automated software development.
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Microsoft Research has open-sourced Agensh, a decentralized harness for large teams of coding agents. The Agensh multi-agent harness removes the central orchestrator that most agent frameworks depend on. Every worker picks its own sub-task, shares findings and merges code into a common Git repo. On ProgramBench, the team scaled the setup from 1 agent to 1,024 agents. TL;DR A Harness: Tested from 1 to 1,024 agents. Each worker gets a 272,000-token input and 128,000-token output limit. Runs on: Linux with Docker Compose. Single node by default (8 workers). The 1,024-agent run used 16 nodes, 64 agents each. Workers have a 64 GiB memory ceiling. Performance: more agents raised scores on all 5 hardest ProgramBench tasks, and reached them sooner. Best: 79.59% pandoc pass rate with 32 agents on GPT-6.1-sol. GPT-5.6-sol hit 55.06% with 1,024 agents. Worst: the 5-task mean reached only 28.78% at 128 agents. Going from 1 to 8 agents added 1.37 points. What is Agensh? Agensh is a multi-agent harness from Microsoft Research that coordinates many LLM agents without a lead agent. The target problem is the orchestrator ceiling. In orchestrator-worker designs, a lead agent plans, assigns and merges all work. The research paper cites Claude Code agent teams, Codex sub-agents, Copilot fleet and Kimi Agent Swarm as examples. Agensh lets the workers do that coordination themselves. How does the Agensh cooperation loop work? Each worker runs the same 5-step loop, concurrently and asynchronously: Gather context: read the goal, peer progress, messages and findings. Claim a sub-task: post a CLAIM, then settle overlaps by direct message. Take action: work locally with tools and post useful findings early. Verify results: check the work against the sub-task’s acceptance criteria. Merge progress: merge into the shared repo, post an update, then repeat. Three services connect the workers. Gitea hosts the shared workspace, with branches, PRs and merge conflicts. Mattermost ca
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