Foundry Hosted Agents: Production AI Agent Runtime

On June 2, 2026, Microsoft used the Build 2026 keynote to ship the missing piece of the agent stack: a managed runtime where production AI agents actually live. Foundry Hosted Agents took the public preview slot in Microsoft Foundry Agent Service, with general availability promised in the next 30 days. The pitch is straightforward — your laptop prototype gets a sandbox, durable state, isolation, identity, observability, and a deployment URL, without you renting a single VM.