Microsoft makes Copilot harness available to developers through Foundry
On October 28, 2026, Microsoft made the Microsoft Copilot harness available to developers and enterprise customers through Microsoft Foundry. The multi-model orchestration layer already powers Copilot Code, Copilot Studio, the GitHub Copilot app, the Copilot CLI and VS Code.
Microsoft on October 28, 2026 made the Microsoft Copilot harness available to developers and enterprise customers through Microsoft Foundry, according to an announcement on the Official Microsoft Blog, as reported by Unite.AI.
The harness is the multi-model orchestration layer that already powers Copilot Code, Copilot Studio, the GitHub Copilot app, the Copilot CLI and VS Code.
What Microsoft means by a harness
Microsoft describes a harness as everything around the model. In its framing, the harness is the orchestration layer that gives an agent the right instructions, context and execution environment.
The harness is described as multi-model, meaning it is not tied to a single underlying model.
Where it already runs
According to Microsoft, the same harness is used across these products:
- Copilot Code
- Copilot Studio
- The GitHub Copilot app
- The Copilot CLI
- VS Code
The announcement makes that layer available to external developers and enterprise customers through Microsoft Foundry.
What this means
The orchestration layer Microsoft uses in its own Copilot products is now offered as a component through Foundry, rather than only inside those products. Microsoft's definition treats the harness as separate from the model: instructions, context and execution environment are handled by the harness, while the model is one part of the system. Developers and enterprises building agents on Foundry can use the same layer that runs across Microsoft's Copilot surfaces.
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