Microsoft ACS SDK: Agent Control Sandbox PoC (opens in new tab)

Microsoft's Agent Control Specification is one of the more practical Build 2026 ideas because it targets a gap every serious agent team eventually hits: prompts are not controls. If an AI agent can call tools, write files, update tickets, query internal data, or invoke another agent, the runtime needs a deterministic place to say "allow," "deny," or "modify" before the action reaches the real system. The naming is still easy to confuse. Microsoft's Build recap calls ACS the Agent Control Spec...