Microsoft Agent Framework Harness and Hosted Agents Reach General Availability
Microsoft's Agent Framework reached GA on April 2, 2026, with the Agent Harness and Foundry Hosted Agents stabilizing at Build 2026, providing a single binary runtime for local, container, and hosted deployment. The harness bundles OpenTelemetry, tool approval, and context compaction, while a VILA-Lab study of Claude Code found ~98.4% of agent code is harness infrastructure, validating the need for a supported runtime. Foundry Hosted Agents bill on consumption, enabling platform teams to govern agent execution.