Windows 11 will introduce "Experimental agentic features" with the installation of Build 26220.7262, which users must manually enable. These features are in an experimental phase and may affect device performance. Microsoft warns of potential security vulnerabilities, particularly from emerging attack techniques like cross-prompt injection, which can lead to harmful commands being executed. The agents operate within an "Agentic Workspace" with scoped, auditable accounts, but unlike Windows Sandbox, they persist across sessions, increasing the attack surface. By default, agents have read and write access to common folders, which presents additional vulnerabilities. Microsoft is working on improving security measures, including more granular permissions and defenses against prompt injection.