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Microsoft open-sources Agensh, a multi-agent harness its authors scaled to 1,024 agents

Release Ruler for this brief: marked at its publication date, Oct 26, 2026, among the AI models we track.

Microsoft has open-sourced Agensh, a multi-agent harness with no central orchestrator that its authors report running with up to 1,024 agents; the benchmark numbers are the authors' own and we have not reproduced them.

By Agentic Weekly · Evidence: Reported · How we work

First seen
(via MarkTechPost feed (watcher seed run); primary source is the Microsoft GitHub repository)
Source published
(we saw it 2.8 days later)
Brief published

What changed

  • Microsoft published Agensh, described as "a decentralized, scalable multiagent harness", under the MIT license. GitHub shows a v1.0 release on 2026-10-23 (UTC); the README dates the open-source announcement 2026-10-24.
  • Design: agents discover and claim sub-tasks, share findings, verify results and merge progress asynchronously, with no central orchestrator. Gitea provides the shared workspace and Mattermost the messaging interface.
  • In the authors' experiments Agensh sits on top of the per-agent loop of the Copilot harness (github/copilot-cli), and its shared-context mechanism is adapted from DeLM.
  • Authors' results on ProgramBench: across five tasks the mean final test-pass rate rose from 19.31% with 1 agent to 28.78% with 128 agents; on Pandoc it rose from 33.89% with 1 agent to 55.06% with 1,024 agents under a six-hour budget.
  • The release includes a single-node team setup using Docker Compose and a single-agent baseline, with a reproduction guide in the repository.

In the source’s words

“Agensh is a self-organized multi-agent harness that scales to 1,024 agents.”

“Agents discover and claim sub-tasks, share findings, verify results and merge progress asynchronously, without a central orchestrator.”

What we have not verified

  • We did not run Agensh or reproduce any benchmark number; all results are the authors' own, run with models and settings described in their README.
  • We found it through a press feed first; the vendor's own repository is the primary source for every fact here.
  • The README's announcement date (2026-10-24) and GitHub's release date (2026-10-23 UTC) differ; we show the GitHub date as the source publish time.

This brief is Reported: written from the sources below, not from running the release ourselves.

Sources

Spotted an error? See our corrections policy or email the address on the contact page. Markdown version for agents: /news/microsoft-agensh-multi-agent-harness-1024-agents.md

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