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The GitHub engineering team built a best-in-class, truly multi-model harness, which we've implemented across Microsoft products. Introducing Microsoft Copilot harness in Foundry Agent Service, a simpler way to build agents without rebuilding the execution layer. It handles orchestration, tools, context, and controls so you can focus on your agent’s... show more
678,684 views • 9 days ago •via X (Twitter)
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More on the Microsoft Copilot harness and how to get started.

@github less plumbing, more agent. cool, building one tonight

@github Never miss a @jeffhollan demo!

@github Pricing from the Foundry blog: the harness runtime is free until December 1, 2026. After that, sandbox compute is $0.0994 per vCPU hour and memory $0.0118 per GiB hour. Model calls are billed separately.

@github Damn people still getting paid to make harnesses after there's already 500 of them

@github a shared execution layer is useful, the part I would still keep in my own hands is the list of actions each agent is allowed to take

@github One execution layer across multiple models is a welcome way to keep the plumbing from becoming the project

@github A shared multi-model harness across products is exactly what was needed — handling orchestration and context so teams can focus on skills





