Zero Trust architecture asks that every request be verified, and continuous authentication is how that principle reaches the person or agent operating the session rather than stopping at the token. NIST SP 800-207 and the DoD Zero Trust Strategy describe continuous verification of users and devices, but most deployments check only that a token is valid, the device is compliant, and the policy allows the request. Each of those checks passes when a valid session is used by the wrong person or by software riding a human's credential. A Zero Trust architecture with continuous authentication needs an operator signal, inline enforcement at the policy decision point, per-action granularity, machine coverage across agent and service hops, and signed evidence for auditors. MagenTrust provides that signal and decision next to existing identity providers and policy engines through MAGEN IAM Guard and MagenMCP, emits signed decision records into existing SIEM tooling, and deploys inside the perimeter, including air-gapped networks, with no data egress.