Drift Engine Overview — Executive Brief

Drift Engine Overview — Executive Brief

For federal CIO/CISO leadership, UIAO’s drift engine is the control that continuously answers: “Are we still operating exactly as canonized policy, identity, and evidence rules require?” It classifies drift using one taxonomy, assigns operational urgency, and drives a bounded remediation path.

Canonical drift classes

UIAO uses five classes (verbatim from the Drift Detection Standard):

  • DRIFT-SCHEMA — structure no longer matches canonical schema.
  • DRIFT-SEMANTIC — structure is valid, but meaning is stale or inconsistent.
  • DRIFT-PROVENANCE — evidence chain is incomplete, invalid, or broken.
  • DRIFT-AUTHZ — data moved outside its authorized consent envelope.
  • DRIFT-IDENTITY — issuer cannot be resolved to a verified identity object.

Severity model and operational obligation

Severity Meaning Operational obligation
P1 Active-use claim with provenance/identity risk Halt affected flow, alert immediately, escalate to governance leadership (Canon Steward / Architecture Lead / CISO path)
P2 Live schema/semantic drift Auto-remediate when deterministic; otherwise escalate within 1 hour
P3 Dormant/historical drift Queue remediation and close within 24 hours
P4 Style/metadata drift with no semantic impact Log and auto-remediate within 72 hours

Where drift is detected

  1. CI substrate walker (uiao substrate walk, substrate-drift.yml) detects shipped classes now: DRIFT-SCHEMA and DRIFT-PROVENANCE.
  2. Runtime conformance runner detects runtime drift during adapter execution and emits remediation-contract records (drift_class, severity, timestamps, remediation action, evidence, escalation path).

How leaders should consume drift output

  • Governance tickets: every material event becomes a tracked governance action with explicit owner and SLA.
  • OSCAL evidence regeneration: drift outcomes trigger regeneration of affected evidence artifacts so SSP/POA&M narratives stay canon-accurate.
  • Enforcement adapter feedback: remediation outcomes (halt | fix | flag | log) feed enforcement behavior to reduce repeat drift.

Maturity snapshot (current)

Drift class Maturity
DRIFT-SCHEMA SHIPPED
DRIFT-PROVENANCE SHIPPED
DRIFT-SEMANTIC TARGET (partial runtime design)
DRIFT-AUTHZ DESIGN-ONLY (pending runtime implementation)
DRIFT-IDENTITY DESIGN-ONLY (pending runtime implementation)

Leadership takeaway: UIAO already ships structural/provenance drift enforcement in CI, with the same taxonomy and severity contract extending to runtime semantic, authorization, and identity drift as those controls are completed.

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