Policy-Bound Execution

Policy-bound execution is an execution model in which every proposed agent action is evaluated against a published, versioned policy before it runs. Three properties define it. The binding is to a specific policy version, so the exact rule set in force at the moment of any past action can be named, retrieved, and shown to an auditor. Behavior is fail-closed: if the decision service is unreachable or the evidence record cannot be persisted, the action does not proceed. And every decision carries machine-readable reason codes, so the basis for each outcome is captured at decision time.

The model closes two of the gaps the MAS SAFR (Safeguards for Agentic Finance at Runtime) white paper identifies in current governance infrastructure. Pre-execution assurance: model risk management validates before deployment and audit reviews what happened afterward, leaving the individual runtime decision unexamined. Fragmentation: per-deployment guardrails produce records that cannot be audited in a consistent format. Under policy-bound execution the decision point is uniform, the policy is a governed artifact, and the record has the same shape for every action. The evaluation also repeats for every action in a multi-step workflow; an allow at one step confers no authority at the next.

In practice the pattern has two halves. Authoring is change-controlled: policies are versioned, linted before publishing, and released through approval. Runtime is enforcing: the engine verifies it holds the published, signed policy version, evaluates the action, and resolves it to a small closed vocabulary of outcomes.

SAFR expresses the same pattern through its Controls Repository and disposition engine, and states the resulting guarantee as its thesis: "no agentic action reaches execution without having been declared, authorised, and assessed." The agent mandate supplies the authority the policy enforces. In KLA's SAFR implementation, the Policy Builder and the KLA Policy Engine fill this role.