Microsoft Makes Copilot Harness Available Through Foundry

Microsoft on October 28, 2026 made the Microsoft Copilot harness — the multi-model orchestration layer that already powers Copilot Code, Copilot Studio, the GitHub Copilot app, the Copilot CLI, and VS Code — available to developers and enterprise customers through Microsoft Foundry, in an announcement on the Official Microsoft Blog.

Microsoft describes a harness as everything around the model: the orchestration layer that gives an agent the right instructions, context, execution environment, and controls to accomplish work, with support for open standards such as the Model Context Protocol plus agent skills and agent plugins. The GitHub engineering team built the Copilot harness, and Microsoft has adopted it company-wide. A companion Microsoft Foundry Blog post the same day introduced the harness in Foundry Agent Service in public preview and announced general availability of long-running resilience for hosted agents.

Microsoft said the harness is…