The Override Asymmetry: Why ABSTAIN-Plus-Human-Override Is Not Guardrails-Plus-Human-in-the-Loop

The apparent similarity between guardrails-with-human-in-the-loop (HITL) and ABSTAIN-with-human-override masks a structural difference. Both patterns place a human near the point of execution, but they do so on opposite sides of the authorization boundary and therefore produce fundamentally different outcomes. This technical note establishes that the distinction is architectural, not implementational. The two patterns differ along three independent axes: the basis on which the human is invoked, the nature of the human task, and the properties of the artifact produced by the human’s action. These differences yield a single consequence: the two architectures impose differently shaped bounds on human-labor cost. Guardrails-plus-HITL scales with action volume. ABSTAIN-plus-override scales with policy incompleteness. The note develops this asymmetry and addresses the early-deployment objection that high ABSTAIN rates may initially resemble HITL in operational terms. It argues that the similarity is superficial: under HITL, human intervention resolves individual actions and does not persist; under override, human intervention codifies into the active constraint set and binds future verdicts under the same authority chain. As a result, the work performed by humans in the two systems is not comparable, even when the volume of intervention appears similar. The analysis further shows that the two patterns exhibit different failure modes under stress. HITL degradation is often silent, as review records attest to the occurrence of decisions without preserving evidence of review depth. Override degradation is visible at the policy layer, as permissive overrides accumulate as changes to the constraint set and can be detected through replay. The note is situated within the FERZ research corpus and provides an operational interpretation of Criterion 6 (Override Governance) from On the Impossibility of Observability-Based Authorization. It clarifies what it means for override to occur within the enforcement architecture rather than around it. The argument is structural throughout. It does not depend on empirical assumptions about deployment timelines, policy maturation rates, or operational cost. It defines the architectural properties required for human intervention to produce verifiable authorization artifacts in ex-ante governance regimes.

Hali tarjima qilinmagan