Policy Artifacts & Runtime Governance
A Policy Artifact is a sealed cryptographic object that encodes governance rules for autonomous systems. A runtime governance boundary evaluates and enforces those rules during execution, producing signed receipts that prove what actions were taken.
- ■Transforms passive logging into active enforcement
- ■Creates cryptographic proof that rules were evaluated
- ■Enables offline verification of governance claims
What is a Policy Artifact?
A Policy Artifact is a signed, versioned, time-bounded governance object. It contains selection rules that determine which operations are subject to governance, enforcement mappings that define what actions to take, and cryptographic bindings that prevent tampering. Once sealed, modifying any field invalidates the signature.
{
"policy_version": 3,
"policy_id": "sha256:a1b2c3...",
"issued_at": "2024-01-15T10:00:00Z",
"not_before": "2024-01-15T10:00:00Z",
"not_after": "2024-07-15T10:00:00Z",
"selection_rules": [...],
"enforcement_mapping": {
"DRIFT_DETECTED": "BLOCK_EXECUTION",
"SIGNATURE_INVALID": "TERMINATE"
},
"issuer_signature": "Ed25519:..."
}What is a runtime governance boundary?
The runtime governance boundary is the component that intercepts operations, evaluates them against the policy artifact, and enforces the appropriate action. It sits between the request origin and the execution target. Every evaluation produces a signed receipt regardless of whether the action was allowed.
Boundary placement depends on your architecture. Options include API gateway, sidecar proxy, runtime wrapper, or agent framework integration. Each has different latency, isolation, and operational characteristics.
What is selective interception?
Selective interception means the governance boundary evaluates selection rules to determine which operations require enforcement. Not every operation needs governance overhead. The policy artifact defines match conditions; the boundary applies them deterministically.
Matched Operations
- ✓Full policy evaluation
- ✓Enforcement action applied
- ✓Signed receipt emitted
Unmatched Operations
- —Pass-through execution
- —No enforcement overhead
- —Optional audit logging
What are enforcement receipts?
An enforcement receipt is a signed record of a governance decision. It contains the policy reference, the action taken (CONTINUE, BLOCK_EXECUTION, TERMINATE), a reason code, timestamps, and a signature. Receipts chain together via prev_hash to form a continuity chain.
- ■CONTINUE: Operation allowed to proceed; receipt documents the evaluation
- ■BLOCK_EXECUTION: Operation prevented from starting; workload never executes
- ■TERMINATE: Running operation stopped; receipt emitted before shutdown
Frequently asked questions
Is this just logging with extra steps?
No. Logging records what happened. Governance enforcement controls what can happen. The receipt proves the enforcement occurred. Traditional logs can be edited; receipts are signed and hash-chained.
What happens if the boundary fails?
The policy artifact defines fail-closed or fail-open semantics. Fail-closed blocks execution when the boundary is unavailable. Fail-open allows execution but marks receipts as DEGRADED. Your threat model determines the right choice.
How do we handle policy updates?
Policy versions are monotonic. A new version references the previous version. The boundary validates the new signature before accepting it. Running workloads can continue under the old policy or be migrated.
Deep dive topics
Policy Artifact Specification
Required fields, versioning, signing, and selection rules
Runtime Enforcement Boundary
Where to enforce: gateway, sidecar, runtime, agent wrapper
Selection Rules Design
Designing match logic without privacy leakage
Selective Interception Explained
When and how interception creates enforceable proofs
Failure Modes & Safe Defaults
Fail-closed vs fail-open decisions and recovery patterns
EU AI Act 2026 Engineering Guide
Operational readiness patterns for August 2026
Related Pillars
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