AI BriefingMicrosoft Makes GitHub's Multi-Model Copilot Harness Available via Microsoft Foundry
·2026.10.29 01:51
Key point
The harness, which powers GitHub Copilot and VS Code, supports 20+ frontier models and is built by the GitHub engineering team.
Details
- Microsoft is making the GitHub-built Copilot harness available through Microsoft Foundry, providing a managed way to build agents that reason, use tools, and complete long-running tasks.
- The harness supports 20+ frontier models plus bring-your-own-key options, allowing developers to use the right model for each job without switching tech stacks or maintaining their own orchestration layer.
- The harness runtime was recently ported to Rust, resulting in industry-leading performance, reduced session overhead, and lower time-to-first-token.
- The SDK is available for download, or the harness can be run in the cloud managed by Foundry, with Microsoft handling the agent loop, sandbox, and governance.
- The harness is designed to be fast, token-efficient, and predictable, supporting open standards like MCP and agent skills.
- It is battle-tested at the scale of millions of users and hundreds of real-world use cases across Microsoft products.
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