Microsoft opens its multi-model Copilot harness to developers through Foundry
Microsoft is making the GitHub-built Copilot harness available through Microsoft Foundry, so developers and enterprises can build agents that work across multiple AI models.
By GennnAi··1 min read
MicrosoftMicrosoft CopilotCopilot harnessMicrosoft FoundryGitHubGitHub CopilotCopilot StudioVS CodeOutilsEntreprisesFlash
The harness, an orchestration layer around the model, already powers Copilot Code, Copilot Studio, the GitHub Copilot app, the CLI and VS Code. It supports 20+ frontier models, bring-your-own-key and MCP. Its runtime was ported to Rust. An SDK is downloadable, or the harness runs in the Foundry-managed cloud. Microsoft says it is built to be fast, token-efficient and predictable. Platforms remain open and interoperable.
Source: The Official Microsoft Blog, published on October 28, 2026.