Microsoft renames GitHub Copilot harness to Microsoft Copilot harness, expands it across products
On October 28, 2026, Microsoft announced it is renaming the GitHub Copilot harness to the Microsoft Copilot harness and expanding it as a common foundation for its Copilot product family, including Copilot Studio, Copilot Code, the GitHub Copilot app, CLI, and Visual Studio Code. The harness is the orchestration layer that sits between the AI model and the agent, handling when to call the model,…
Key points
- Microsoft renames GitHub Copilot harness to Microsoft Copilot harness as a shared foundation across Copilot products
- Advanced harness adds long-running tasks, iterative reasoning, persistent memory, and sub-agent coordination
- Internal tests show 10.8-22.1 point pass-rate gains and 84-91% recovery after tool failures vs under 7%
For existing Copilot Studio users, Microsoft says agent behavior, functionality, and billing will not change; product terminology will update gradually. The advanced Microsoft Copilot harness supports long-running tasks, large files, iterative reasoning, persistent memory, and sub-agents with shared context, shifting design from predefined flows to goal-directed agents that adjust methods. Microsoft's internal evaluation reported a 10.8 percentage-point pass-rate improvement with OpenAI models and 22.1 points with Anthropic models versus the standard harness, and the advanced harness resolved issues in 84–91% of cases after tool failures versus under 7% for the standard harness. Microsoft advises choosing the harness based on task complexity to avoid unnecessary credit consumption and latency.
The story so far
2 episodes →- Microsoft renames GitHub Copilot harness to Microsoft Copilot harness, expands it across productsthis story
[Microsoft Copilot] From GitHub Copilot harness to "Microsoft Copilot harness". How will agent development in Copilot Studio change? #0405
note.com · 6 November 2026
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