SecRoot.io This document defines the Enforcement-Action HTTP response header field. The field provides a minimal, interoperable mechanism for signaling advisory enforcement coordination between cooperating components operating within a defined administrative or policy trust boundary. The header conveys a single action token and optional parameters without modifying HTTP status code semantics or representation meaning. The field is designed to be safely ignored by recipients that do not recognize it and to operate over existing HTTP deployments without changes to transport protocols. This specification defines the syntax, semantics, processing rules, and IANA registration for the header field.