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TG_RUNTIME_CONFIGURATION

TrustGate Runtime Configuration Engine

0. Identity

Loading identity…

Depends on module:

Decision-grade verification and assurance domain that orchestrates verifier workflows, evidence handling, trust scoring, audit trails, and assurance packaging across CSRD/ESRS and other frameworks. Enables third-party sign-off, dispute handling, and assurance-ready disclosure outputs with replayable provenance.

Domain:

assurance-verification

Category:

trust-assurance

Classification:

module

Lifecycle status:

active

Semver:

1.0.0

Introduced in:

v0.3

Governance

AI risk level:

high

Trust threshold:

0.97

Human review required:

true

Verifier involved:

true

Audit required:

true

Ownership

Primary owner:

Platform

Architecture board:

true

White-label allowed:

true

Entrypoints

Docs:

/verification-assurance

UI:

/app/assurance

API:

/api/assurance

Dependencies

Modules

sis
input-hub
reports-insights-hub
zara
zaam

Unresolved tokens

ALTD
DAL
EvidenceVault
StripeConnect
TruliooKYB
TrustGate
VTE
VerifierWorkflowEngine

Engines (declared)

VerifierWorkflowEngine
DaVE
VTE
DICE
EvidenceVault
ALTD
DAL
TrustGate
StripeConnect
TruliooKYB
AISIM

Micro-engines (from registry)

None

Micro-engines (declared)

None

Signals

USO

ASSURANCE.VERIFICATION
ASSURANCE.EVIDENCE
ASSURANCE.SIGNOFF
AUDIT.LINEAGE
GOVERNANCE.TRUST
IDENTITY.VERIFIER
PAYMENT.ESCROW

CSI

CSI_VERIFICATION_ASSURANCE

SSSR tags

assurance
verification
verifiers
evidence
signoff
trust-score
audit
tamper-detection
blockchain
rfp
disputes
escrow
stripe-connect

Workflows & Outputs

Workflows

VerifierOnboardingAndQualification
AssuranceRFPAndProposalFlow
EvidenceRequestAndCollection
EvidenceValidationAndScoring
TrustScoreComputationAndPropagation
VerifierReviewAndCommenting
IssueFlaggingAndDisputeResolution
VerifierSignOffAndStamping
AssurancePackagingForReports
PaymentEscrowAndPayoutOrchestration

Outputs

verifier_profiles
assurance_requests
evidence_packages
validation_findings
trust_score_updates
signoff_stamps
assurance_ready_disclosure_packages
payment_events

Audit

Ledger:

ALTD

Replay supported:

true

PII policy:

controlled_pii_outside_omr

1. Purpose

The TrustGate Runtime Configuration Engine is the canonical runtime configuration authority for TrustGate.

It resolves, validates, versions, signs, snapshots, distributes, audits, and replay-binds the configuration used by all TrustGate engines.

This engine is critical because TrustGate engines must not hardcode operational behavior. Runtime behavior must be governed by explicit, versioned, replayable configuration objects.

The engine provides authoritative runtime answers to questions such as:

Which validation rule profile is active?
Which scoring profile applies to this signal type?
Which decision thresholds apply to this ECO entity?
Is replay required?
Is DAL anchoring mandatory?
Which federation profile applies to this counterparty?
Which AI model advisory settings are permitted?
Which tenant overrides are allowed?
Which engine CMI versions are compatible?
Which feature flags are enabled?
Which rollout cohort is active?
Which alert and SLO profiles apply?
Which configuration snapshot must be used for deterministic replay?

The engine is the configuration control plane for TrustGate.

It does not score signals, execute validation rules, route signals, or anchor DAL records. It provides the governed configuration context that allows those engines to operate consistently.

2. Architectural Role

TrustGate has many micro-engines. Most depend on runtime configuration.

Without this engine, configuration would become fragmented across code, environment variables, YAML files, tenant settings, policy bundles, database flags, and ad hoc overrides.

The Runtime Configuration Engine centralizes that control.

ZAR / FAGF / SSSR / Tenant Policy / Runtime Stores
        │
        ▼
──────────────────────────────────────────
 Runtime Configuration Engine
──────────────────────────────────────────
        │
        ├── Engine Configuration Views
        ├── Policy Contexts
        ├── Profile Resolutions
        ├── Feature Flag Decisions
        ├── Tenant Override Decisions
        ├── Replay Configuration Snapshots
        ├── Configuration Digests
        └── Audit / DAL / VIZZ / AII Events

All TrustGate engines should request configuration from this engine or from a cache populated by this engine.

3. Canonical Identity

Property	Value
MEID	`MEID_TRUST_CONFIG_RUNTIME`
CMI	`vera.TG-CONFIG.ENGINE.RUNTIME.1_0_0`
KIND	`ENGINE`
Owner Module	Verification & Assurance
Runtime Tier	Tier-0 Runtime Control Plane
Engine Category	`CONFIG`
Engine Domain	`trust`
ZAR Registration	Required
Replay Support	Native
DAL Anchoring	Required for material configuration changes
Federation Aware	Yes
Critical Path	Yes, through cache-backed resolution

The MEID identifies the stable logical configuration engine.

The CMI identifies this specific versioned executable artifact.

4. Why This Engine Is Critical

The Runtime Configuration Engine is a systemic dependency.

TrustGate must be able to prove which configuration was active when an assurance outcome was produced.

For each TrustGate decision, ZAYAZ must be able to reconstruct:

active policy bundle;
validation rule profile;
scoring profile;
decision thresholds;
feature flags;
tenant override state;
engine compatibility state;
replay requirements;
DAL anchoring requirements;
federation redaction profile;
AI advisory permissions;
configuration hash.

This is essential for:

OARM replay;
auditor review;
CSRD / ESRS assurance evidence;
federation trust exchange;
DAL proof integrity;
AII computation;
AI governance;
incident investigation;
version rollback.

A TrustGate decision without a configuration snapshot is not fully replayable.

5. Runtime Responsibilities

Responsibility	Description
Configuration Resolution	Resolve active runtime configuration for engines, tenants, signal types, ECO entities, regions, and federation contexts.
Profile Resolution	Resolve validation, scoring, decision, quarantine, replay, DAL, federation, AI, observability, and scheduler profiles.
Policy Bundle Binding	Bind runtime behavior to FAGF, OARM, AFLE, EGFS, and tenant policies.
Feature Flag Resolution	Resolve feature flags by environment, engine, tenant, region, cohort, ECO, and rollout stage.
Tenant Override Governance	Evaluate whether tenant-specific overrides are permitted and safe.
Engine Compatibility Resolution	Verify MEID, CMI, CSI, and schema compatibility before runtime execution.
Configuration Validation	Validate configuration schemas, required fields, allowed values, thresholds, and safety boundaries.
Configuration Snapshotting	Produce immutable configuration snapshots for replay and audit.
Configuration Digesting	Produce cryptographic configuration hashes for traceability.
Cache Population	Populate and invalidate low-latency configuration caches.
Change Control	Validate configuration changes before activation.
Audit Logging	Emit configuration resolution and change events.
DAL Candidate Creation	Produce DAL anchor candidates for material configuration changes.
Drift Detection	Detect configuration drift across nodes, regions, tenants, and federation participants.
Rollback Support	Restore known-good configuration snapshots.
Runtime Distribution	Distribute configuration to engines, scheduler, observability, and federation runtimes.

6. Configuration Domains

The engine manages multiple configuration domains.

Domain	Examples
Validation	Validation rule profile, rule severity, rule action, registry snapshot.
Policy	FAGF bundle, OARM profile, tenant policy, override rules.
Scoring	Trust score weights, dimensions, modifiers, confidence formulas.
Decision	Accept/review/quarantine/reject thresholds.
Quarantine	SLA, evidence requirements, reviewer roles, escalation routes.
Replay	Replay requirement, sampling rate, replay triggers, deterministic snapshot rules.
DAL	Anchor profile, batch mode, critical artifact anchoring, retry strategy.
Federation	AFLE profile, EGFS endpoint, redaction, import/export rules.
AI Governance	DSAIL permissions, model CMI, advisory mode, suppression rules.
Observability	Metrics, traces, SLOs, alerts, dashboards, retention.
Scheduler	Jobs, retries, backoff, priority, periodic tasks.
Security	RBAC, signing requirements, DID validation, secret references.
Engine Compatibility	Supported MEIDs, allowed CMIs, compatible CSIs, rollout versions.
Feature Flags	Experimental engines, rollout cohorts, kill switches, safe-mode flags.

7. Runtime Configuration Hierarchy

Configuration resolution uses a deterministic hierarchy.

Global Platform Defaults
      │
      ▼
FAGF Governance Policy
      │
      ▼
Module-Level TrustGate Policy
      │
      ▼
Engine-Level Defaults
      │
      ▼
Environment Policy
      │
      ▼
Region Policy
      │
      ▼
Tenant Policy
      │
      ▼
ECO Entity Policy
      │
      ▼
Signal Type / Metric Type Policy
      │
      ▼
Federation Counterparty Policy
      │
      ▼
Emergency Override / Kill Switch

The hierarchy is deterministic and must be documented in the resolved configuration output.

No override may silently replace a higher-priority governance constraint.

8. Override Rules

Overrides are allowed only when the target configuration field is marked overridable.

Override Type	Example	Allowed by Default
Tenant Override	Tenant-specific decision threshold.	Conditional
Region Override	EU-specific federation profile.	Yes
ECO Override	Higher replay sampling for a risky supplier.	Conditional
Signal-Type Override	Sensor-specific validation profile.	Yes
Emergency Override	Disable federation export after incident.	Yes, audited
Developer Override	Enable experimental engine in dev.	Non-production only
AI-Suggested Override	DSAIL recommends threshold tuning.	Advisory only
Manual Hotfix Override	Runtime operator changes setting.	Strictly controlled

Overrides must include:

reason;
actor;
approval status;
expiry;
scope;
policy basis;
audit reference.

9. Configuration Object Model

The canonical configuration object contains:

Section	Purpose
`config_identity`	Configuration ID, version, digest, status.
`scope`	Environment, region, tenant, ECO, signal type, federation target.
`policy`	FAGF, OARM, tenant, and module policy references.
`profiles`	Active validation, scoring, decision, replay, DAL, federation, AI, observability profiles.
`feature_flags`	Runtime feature flag decisions.
`engine_compatibility`	Allowed MEIDs, CMIs, CSIs, schema versions.
`thresholds`	Trust, confidence, replay, quarantine, SLO, and alert thresholds.
`overrides`	Applied and rejected overrides.
`security`	RBAC, signing, DID, secret, and access settings.
`distribution`	Cache TTL, propagation status, region sync state.
`snapshot`	Replay snapshot metadata and hash.

10. Runtime Processing Pipeline

Receive Configuration Request
      │
      ▼
Validate Request Scope
      │
      ▼
Load Applicable Defaults
      │
      ▼
Load Governance Policy
      │
      ▼
Load Engine Policy
      │
      ▼
Load Tenant / ECO / Region Policies
      │
      ▼
Evaluate Overrides
      │
      ▼
Resolve Profiles
      │
      ▼
Validate Compatibility
      │
      ▼
Validate Safety Boundaries
      │
      ▼
Build Resolved Configuration
      │
      ▼
Generate Configuration Digest
      │
      ▼
Emit Configuration Snapshot
      │
      ▼
Return Engine-Specific View

The resolved configuration must be deterministic for the same input scope and policy snapshot.

11. Processing Algorithm

function resolve_runtime_configuration(request):

    validate_request_scope(request)

    defaults = load_global_defaults()

    governance_policy = load_fagf_policy(request)

    module_policy = load_trustgate_policy(request)

    engine_defaults = load_engine_defaults(request.engine_meid)

    environment_policy = load_environment_policy(request.environment)

    region_policy = load_region_policy(request.region)

    tenant_policy = load_tenant_policy(request.tenant_id)

    eco_policy = load_eco_policy(request.eco_number)

    signal_policy = load_signal_type_policy(request.signal_type)

    federation_policy = load_federation_policy(request.target_eco)

    emergency_policy = load_emergency_overrides(request)

    candidate_config = merge_in_deterministic_order(
        defaults,
        governance_policy,
        module_policy,
        engine_defaults,
        environment_policy,
        region_policy,
        tenant_policy,
        eco_policy,
        signal_policy,
        federation_policy,
        emergency_policy
    )

    evaluated_overrides = evaluate_overrides(candidate_config)

    validate_schema(candidate_config)

    validate_safety_boundaries(candidate_config)

    validate_engine_compatibility(candidate_config)

    resolved_config = finalize_configuration(candidate_config)

    digest = compute_configuration_digest(resolved_config)

    snapshot = create_configuration_snapshot(resolved_config, digest)

    emit_configuration_resolved_event(snapshot)

    return project_engine_view(snapshot, request.engine_meid)

The merge must be stable, explainable, and replayable.

12. Deterministic Merge Strategy

Configuration merges must follow three principles:

Lower layers may refine but not violate higher governance constraints.
Explicit overrides must be recorded.
Conflicts must be rejected or escalated, not silently resolved.

Example precedence:

Global Default:
  replay_required: false

FAGF Policy:
  replay_required: true for critical assurance events

Tenant Override:
  replay_required: false

Result:
  replay_required: true
  tenant_override_status: rejected
  reason: cannot override FAGF mandatory replay

13. Configuration Safety Boundaries

Safety boundaries prevent dangerous runtime behavior.

Boundary	Requirement
Minimum Replay Sampling	Cannot fall below FAGF minimum.
DAL Critical Anchoring	Cannot be disabled for critical events.
AI Advisory Mode	AI cannot be promoted to autonomous override without governance approval.
Federation Redaction	Cannot be weakened below federation profile minimum.
Signature Validation	Cannot be disabled for federation imports.
Audit Critical Events	Cannot disable critical audit logging.
Validation Rule Severity	Cannot downgrade non-overridable critical rules.
Trust Thresholds	Cannot exceed or fall below approved policy bounds.
SLO Alerting	Cannot disable critical SLO alerts in production.
Engine Version	Cannot run unapproved CMI in production.

Safety boundary violations must reject the configuration.

14. Profile Types

TrustGate runtime behavior is assembled from profiles.

Profile	Purpose
`validation_profile`	Rule groups, severity behavior, registry snapshot.
`scoring_profile`	Trust dimensions, weights, modifiers, confidence formulas.
`decision_profile`	Accept, route, review, quarantine, reject thresholds.
`quarantine_profile`	Evidence requirements, reviewer roles, SLA, escalation.
`replay_profile`	Replay triggers, sampling, deterministic snapshot strategy.
`dal_anchor_profile`	Anchoring mode, batch policy, critical artifacts.
`federation_profile`	AFLE/EGFS exchange, redaction, import/export rules.
`ai_governance_profile`	DSAIL model permissions, advisory constraints.
`observability_profile`	Metrics, traces, SLOs, alerts, dashboard feeds.
`scheduler_profile`	Jobs, retries, priorities, execution windows.
`security_profile`	DID, signature, RBAC, secrets, encryption.

Profiles are versioned and must be traceable to ZAR, FAGF, or approved tenant policy.

15. Engine-Specific Configuration Views

Engines should not receive the full configuration object unless required.

The Runtime Configuration Engine returns engine-specific views.

Engine	Configuration View
Validation Rule Engine	Validation profile, rule snapshot, severity/action mapping.
Policy Resolution Engine	Governance bundle, override map, compatibility rules.
Rule Evaluation Engine	Business rule profile, weights, thresholds, evidence rules.
Trust Scoring Engine	Scoring profile, weights, modifiers, confidence model.
Decision Engine	Decision thresholds, blocking rules, replay requirements.
Quarantine Manager	Quarantine SLA, evidence requirements, reviewer roles.
Replay Engine	Replay triggers, replay scope, snapshot rules.
Attestation Engine	Attestation profile, signature settings, evidence requirements.
DAL Anchor Engine	Anchor mode, critical artifacts, retry strategy.
Federation Exchange Engine	Federation profile, redaction, target permissions.
AI Feedback Engine	Feedback permissions, DSAIL destinations, suppression rules.
Observability Engine	SLOs, metrics, alert rules, retention.
Scheduler Engine	Job definitions, retries, backoff, execution windows.
Audit Log Engine	Retention, audit classes, DAL requirements.

This minimizes blast radius and reduces accidental leakage of unrelated settings.

16. Configuration Snapshot Model

Every resolved configuration can be converted into a snapshot.

A snapshot is immutable and replayable.

Field	Description
`config_snapshot_id`	Unique snapshot identifier.
`config_version`	Version of the resolved configuration model.
`config_digest`	Hash of canonical configuration.
`scope`	Environment, region, tenant, ECO, signal type, engine.
`profiles`	Resolved profile versions.
`policy_bundle`	Active policy bundle.
`overrides`	Applied and rejected overrides.
`created_at`	Snapshot creation time.
`expires_at`	Optional expiry.
`replayable`	Whether snapshot is replay-safe.

Snapshots must be referenced by TrustGate runtime outputs.

17. Configuration Digest

The configuration digest is calculated as:

ConfigDigest = SHA256(CanonicalSerialize(ResolvedConfiguration))

The digest must be stable for equivalent configuration objects.

Configuration digest is used by:

OARM replay;
DAL anchoring;
audit logs;
TrustGate decision outputs;
VIZZ runtime dashboards;
federation evidence packages;
AII telemetry;
incident investigation.

18. Canonical Configuration Request

{
  "configuration_request_id": "TGCFGREQ-2026-00001472",
  "engine_meid": "MEID_TRUST_SCORE_CALCULATOR",
  "engine_cmi": "vera.TG-SCORE.ENGINE.CALCULATOR.1_0_0",
  "scope": {
    "environment": "production",
    "region": "eu-north-1",
    "tenant_id": "TEN-2026-0001",
    "eco_number": "ECO-A123",
    "signal_type": "energy_metric",
    "metric_type": "energy.total_consumption",
    "federation_target": null
  },
  "purpose": "runtime_execution",
  "requested_at": "2026-06-25T16:00:00Z"
}

19. Canonical Resolved Configuration

{
  "config_snapshot_id": "TGCFGSNAP-2026-00001472",
  "config_digest": "sha256:4d6f8a...",
  "status": "active",
  "scope": {
    "environment": "production",
    "region": "eu-north-1",
    "tenant_id": "TEN-2026-0001",
    "eco_number": "ECO-A123",
    "signal_type": "energy_metric",
    "metric_type": "energy.total_consumption"
  },
  "policy": {
    "policy_bundle": "FAGF-2026.2",
    "trustgate_policy": "TG-POLICY-2026.2",
    "oarm_profile": "oarm_standard_replay_v1"
  },
  "profiles": {
    "validation_profile": "standard_signal_validation_v1",
    "scoring_profile": "generic_assurance_scoring_v1",
    "decision_profile": "generic_assurance_decision_v1",
    "replay_profile": "standard_replay_v1",
    "dal_anchor_profile": "critical_assurance_anchor_v1",
    "observability_profile": "production_slo_v1"
  },
  "feature_flags": {
    "ai_advisory_context_enabled": true,
    "federation_export_enabled": true,
    "strict_did_validation_enabled": true,
    "experimental_scoring_v2_enabled": false
  },
  "created_at": "2026-06-25T16:00:00Z"
}

20. Engine-Specific View Example

Trust Scoring Engine view:

{
  "config_view_id": "TGCFGVIEW-2026-00001472",
  "engine_meid": "MEID_TRUST_SCORE_CALCULATOR",
  "config_snapshot_id": "TGCFGSNAP-2026-00001472",
  "config_digest": "sha256:4d6f8a...",
  "scoring_profile": {
    "profile_id": "generic_assurance_scoring_v1",
    "weights": {
      "source_reliability": 0.15,
      "identity_confidence": 0.15,
      "data_quality": 0.20,
      "provenance_integrity": 0.20,
      "replay_reliability": 0.10,
      "federation_confidence": 0.10,
      "ai_calibration_confidence": 0.10
    },
    "modifiers": {
      "verified_carbon_passport_bonus": 0.10,
      "stale_replay_penalty": -0.05,
      "invalid_federation_penalty": -0.20
    },
    "bounds": {
      "min_score": 0.0,
      "max_score": 1.0
    }
  }
}

21. Feature Flag Model

Feature flags control runtime capabilities.

Flag Type	Description
Boolean	On/off flag.
Percentage Rollout	Enabled for percentage of traffic.
Cohort Rollout	Enabled for selected tenants/ECOs/regions.
Environment Flag	Enabled in dev/staging but not production.
Kill Switch	Immediately disables a capability.
Shadow Mode	Runs feature without affecting output.
Compare Mode	Runs old and new logic and compares outputs.
Enforcement Mode	New feature becomes authoritative.

Feature flags must be versioned and auditable.

22. Feature Flag Example

{
  "flag_id": "TG-FLAG-STRICT-DID-VALIDATION",
  "name": "strict_did_validation_enabled",
  "status": "active",
  "enabled": true,
  "scope": {
    "environment": "production",
    "region": "EU",
    "tenant_id": "*"
  },
  "rollout": {
    "mode": "cohort",
    "cohorts": [
      "assurance-tier-1",
      "federation-enabled"
    ]
  },
  "safety": {
    "kill_switch_available": true,
    "requires_audit": true
  }
}

23. Tenant Override Example

{
  "override_id": "TGOVR-2026-00001472",
  "tenant_id": "TEN-2026-0001",
  "field": "decision.thresholds.review.min_trust_score",
  "requested_value": 0.70,
  "default_value": 0.60,
  "status": "approved",
  "reason": "Tenant has stricter internal assurance policy.",
  "approved_by": "assurance.governance@viroway.com",
  "expires_at": "2026-12-31T23:59:59Z"
}

Overrides must never be permanent by default. Expiry is recommended.

24. Rejected Override Example

{
  "override_id": "TGOVR-2026-00001473",
  "tenant_id": "TEN-2026-0001",
  "field": "dal.critical_anchor_required",
  "requested_value": false,
  "default_value": true,
  "status": "rejected",
  "reason": "FAGF prohibits disabling DAL anchoring for critical assurance events.",
  "policy_bundle": "FAGF-2026.2",
  "evaluated_at": "2026-06-25T16:00:00Z"
}

Rejected overrides must be logged and visible in governance dashboards.

25. Engine Compatibility

The configuration engine validates engine compatibility before runtime execution.

Compatibility dimensions:

Dimension	Description
MEID	Stable logical engine identity.
CMI	Versioned executable artifact.
KIND	Must match allowed kind, usually `ENGINE`.
CSI Input	Input contract compatibility.
CSI Output	Output contract compatibility.
Schema Version	Supported schema versions.
Policy Profile	Supported policy/profile versions.
Runtime Environment	dev/staging/production compatibility.
Security Approval	Whether CMI is approved for critical runtime.
Rollout Status	active, canary, shadow, retired.

26. Compatibility Example

{
  "compatibility": {
    "engine_meid": "MEID_TRUST_SCORE_CALCULATOR",
    "requested_cmi": "vera.TG-SCORE.ENGINE.CALCULATOR.1_1_0",
    "status": "allowed",
    "rollout_mode": "canary",
    "traffic_percentage": 10,
    "fallback_cmi": "vera.TG-SCORE.ENGINE.CALCULATOR.1_0_0",
    "compatible_input_csis": [
      "comp.TG.INPUT.VALIDATION-RULE-RESULT.v1_0",
      "comp.TG.OUTPUT.ENRICHED-SIGNAL.v1_0"
    ]
  }
}

27. Configuration Lifecycle

Configuration follows a governed lifecycle.

Draft
  │
  ▼
Validated
  │
  ▼
Approved
  │
  ▼
Staged
  │
  ▼
Canary
  │
  ▼
Active
  │
  ├── Deprecated
  ├── Rolled Back
  └── Retired

Lifecycle states:

State	Meaning
`draft`	Proposed configuration not usable at runtime.
`validated`	Schema and safety validation passed.
`approved`	Governance approval granted.
`staged`	Distributed but not active.
`canary`	Active for limited scope.
`active`	Authoritative runtime configuration.
`deprecated`	Still usable but scheduled for removal.
`rolled_back`	Reverted after issue.
`retired`	No longer usable.

28. Configuration Change Control

Material configuration changes require controlled activation.

Material changes include:

trust scoring weight changes;
decision threshold changes;
validation rule severity changes;
DAL anchoring behavior changes;
replay requirement changes;
federation redaction changes;
AI advisory permission changes;
production CMI rollout;
security profile changes;
critical SLO changes.

Material changes must trigger:

validation;
approval;
audit log;
configuration digest;
optional DAL anchoring;
VIZZ notification;
rollback plan.

29. Configuration Change Event

{
  "event_type": "trustgate.config.changed",
  "config_change_id": "TGCFGCHG-2026-00001472",
  "config_snapshot_id": "TGCFGSNAP-2026-00001472",
  "change_type": "decision_threshold_update",
  "scope": {
    "tenant_id": "TEN-2026-0001",
    "environment": "production"
  },
  "changed_fields": [
    "decision.thresholds.review.min_trust_score"
  ],
  "approved_by": "assurance.governance@viroway.com",
  "config_digest": "sha256:4d6f8a...",
  "created_at": "2026-06-25T16:05:00Z"
}

30. Configuration Rejection Event

{
  "event_type": "trustgate.config.rejected",
  "config_rejection_id": "TGCFGREJ-2026-00001472",
  "reason": "safety_boundary_violation",
  "field": "replay.required_for_critical_events",
  "requested_value": false,
  "minimum_required_value": true,
  "policy_bundle": "FAGF-2026.2",
  "severity": "critical",
  "created_at": "2026-06-25T16:05:00Z"
}

Rejection events must be audit logged.

31. Cache Architecture

The engine provides configuration through low-latency caches.

Cache	Purpose
Engine Config Cache	Per-engine runtime views.
Tenant Config Cache	Tenant-scoped resolved configuration.
Policy Bundle Cache	FAGF/OARM/AFLE/EGFS policy bundles.
Feature Flag Cache	Fast flag resolution.
Compatibility Cache	MEID/CMI/CSI compatibility.
Replay Snapshot Cache	Recent replay-safe snapshots.
Emergency Override Cache	Hot kill switches and incident controls.

Cache entries must include:

config digest;
snapshot ID;
expiry;
source version;
invalidation token;
region;
tenant scope.

32. Cache Invalidation

Cache invalidation is policy-controlled.

Triggers include:

new policy bundle;
profile activation;
tenant override change;
feature flag change;
engine CMI rollout;
emergency kill switch;
federation profile update;
security profile update;
validation rule registry update;
scheduler profile change.

Invalidation must be propagated to all affected regions and runtime nodes.

33. Configuration Drift Detection

The engine detects drift across nodes and regions.

Drift types:

Drift Type	Description
Region Drift	Different regions resolve different active config unexpectedly.
Node Drift	A runtime node uses stale config.
Tenant Drift	Tenant-specific config differs from approved state.
Policy Drift	Policy bundle mismatch.
Engine Drift	Engine CMI not compatible with active config.
Feature Flag Drift	Feature flag values differ unexpectedly.
Federation Drift	AFLE/EGFS profile mismatch across parties.
Replay Drift	Replay uses a different config snapshot.

Drift must emit an observability event and may trigger quarantine or safe mode.

34. Safe Mode

Safe mode is a protective configuration state.

Safe mode may be triggered by:

invalid policy bundle;
widespread configuration drift;
DAL verification failure;
federation incident;
replay drift spike;
security incident;
failed engine rollout;
invalid validation registry deployment.

Safe mode may:

disable federation export;
increase replay sampling;
require manual review;
disable experimental CMIs;
require DAL anchoring for more artifacts;
increase audit logging;
reduce auto-accept thresholds;
activate fallback engine versions.

35. Safe Mode Example

{
  "safe_mode": {
    "enabled": true,
    "reason": "federation_conflict_spike",
    "activated_at": "2026-06-25T16:10:00Z",
    "actions": {
      "federation_export_enabled": false,
      "manual_review_required_for_federated_signals": true,
      "replay_sampling_rate": 1.0,
      "dal_anchor_required_for_all_federation_events": true
    }
  }
}

Safe mode activation is always audit-critical.

36. Replay Behaviour

The Runtime Configuration Engine is a primary enabler of deterministic replay.

Replay requires:

exact configuration snapshot;
policy bundle version;
profile versions;
registry snapshots;
feature flag values;
override state;
compatibility decisions;
safety boundary results;
timestamp of resolution;
engine CMI.

Replay configuration verification succeeds when:

Hash(ConfigSnapshot_{original}) = Hash(ConfigSnapshot_{replay})

A TrustGate replay must not use live configuration unless the replay is explicitly marked as "current-policy simulation" rather than audit replay.

37. DAL Integration

Material configuration snapshots and changes may be anchored in DAL.

DAL anchoring is required for:

production policy activation;
scoring profile changes;
decision threshold changes;
validation severity changes;
replay requirement changes;
DAL anchoring profile changes;
federation profile changes;
AI governance profile changes;
safe mode activation;
emergency override activation;
rollback events.

Example:

{
  "artifact_type": "TrustRuntimeConfigurationSnapshot",
  "artifact_id": "TGCFGSNAP-2026-00001472",
  "artifact_hash": "sha256:4d6f8a...",
  "engine_cmi": "vera.TG-CONFIG.ENGINE.RUNTIME.1_0_0",
  "meid": "MEID_TRUST_CONFIG_RUNTIME",
  "policy_bundle": "FAGF-2026.2",
  "created_at": "2026-06-25T16:00:00Z"
}

Final anchoring is performed by the TrustGate DAL Anchor Engine.

38. Audit Log Integration

The engine emits audit events for:

configuration resolution in assurance-critical flows;
material configuration changes;
rejected overrides;
safe mode activation;
rollback;
drift detection;
emergency override activation;
production feature flag changes;
incompatible CMI rejection;
security profile changes.

Routine cache hits do not need audit logging unless policy requires full traceability.

39. Observability Integration

The Runtime Configuration Engine publishes metrics to the Observability Engine.

Key metrics:

Metric	Description
`tg_config_resolution_total`	Total configuration resolutions.
`tg_config_resolution_latency_ms`	Resolution latency.
`tg_config_cache_hit_rate`	Cache effectiveness.
`tg_config_rejected_total`	Rejected configuration requests.
`tg_config_override_rejected_total`	Rejected overrides.
`tg_config_drift_total`	Drift events.
`tg_config_safe_mode_total`	Safe mode activations.
`tg_config_snapshot_created_total`	Snapshots created.
`tg_config_dal_candidate_total`	Configuration DAL candidates.

40. AII Integration

Configuration quality contributes to assurance resilience and transparency.

Example AII telemetry:

{
  "eco_number": "ECO-A123",
  "period": "2026-Q2",
  "config_resolution_count": 184400,
  "config_rejection_rate": 0.0002,
  "override_rejection_rate": 0.012,
  "config_drift_rate": 0.0001,
  "active_policy_bundle": "FAGF-2026.2",
  "config_snapshot_coverage": 0.999,
  "avg_config_resolution_latency_ms": 14
}

41. DSAIL Integration

DSAIL may consume configuration telemetry to detect operational and governance patterns.

DSAIL may recommend:

threshold tuning;
replay sampling changes;
feature rollout adjustment;
policy conflict investigation;
tenant override review;
configuration simplification;
risky feature flag detection.

DSAIL may not:

activate configuration changes;
approve overrides;
disable safety boundaries;
bypass governance approval;
alter production feature flags directly.

AI influence must remain advisory and separately logged.

42. Federation Behaviour

Federation configuration controls AFLE and EGFS exchange behavior.

Federation-related configuration includes:

federation export enabled/disabled;
target ECO permissions;
redaction profile;
replay reference requirement;
DAL reference requirement;
DID verification requirements;
accepted credential types;
inbound trust thresholds;
conflict handling;
federation safe mode.

Outbound federation exchange must not proceed without a resolved federation configuration view.

43. Federation Configuration Example

{
  "federation_profile": {
    "profile_id": "buyer_standard_assurance_v1",
    "target_eco": "ECO-B456",
    "export_enabled": true,
    "redaction_profile": "standard_federation",
    "requires_dal_ref": true,
    "requires_replay_ref": true,
    "requires_did_signature": true,
    "max_attestation_age_hours": 72,
    "conflict_action": "review"
  }
}

44. AI Governance Configuration

AI governance settings define how DSAIL and other AI systems may influence TrustGate.

Setting	Requirement
`ai_advisory_enabled`	Whether AI hints may be included.
`ai_training_allowed`	Whether outcomes may train models.
`ai_model_cmi`	Approved model version.
`ai_override_allowed`	Must be false for TrustGate decisions unless formally approved.
`explainability_required`	Whether AI recommendations must include explanation.
`human_review_required`	Whether AI-influenced cases require review.
`model_drift_threshold`	Threshold for model governance escalation.

45. AI Governance Example

{
  "ai_governance_profile": {
    "profile_id": "trustgate_ai_advisory_v1",
    "ai_advisory_enabled": true,
    "ai_training_allowed": true,
    "ai_override_allowed": false,
    "approved_model_cmis": [
      "siss.DSAIL-TRUST.MODEL.CONTEXT.2_0_0",
      "siss.DSAIL-TRUST.MODEL.CALIBRATION.2_0_0"
    ],
    "explainability_required": true,
    "human_review_required_for_high_risk": true
  }
}

46. Scheduler Configuration

The Scheduler / Orchestrator Engine depends heavily on this engine.

Scheduler configuration includes:

replay schedules;
DAL batch windows;
federation synchronization intervals;
quarantine SLA checks;
audit compaction jobs;
AII telemetry publication;
DSAIL feedback publication;
policy refresh jobs;
feature flag rollout jobs;
stale configuration detection jobs.

Scheduler must receive versioned configuration snapshots.

47. Security Requirements

The engine must:

authenticate all configuration requests;
authorize access by engine, tenant, environment, and role;
prevent unauthorized override creation;
enforce approval workflows for material changes;
support signed configuration bundles;
verify policy bundle signatures;
encrypt sensitive configuration fields;
avoid exposing secrets directly;
use secret references rather than secret values;
audit material changes;
support separation of duties;
enforce production change controls;
support emergency access with strict audit logging.

48. Secret Handling

The Runtime Configuration Engine must not return raw secrets except through approved secret delivery mechanisms.

It should return references such as:

{
  "secret_ref": "aws-secretsmanager://trustgate/prod/federation-signing-key",
  "usage": "signing",
  "rotation_policy": "90d",
  "access_scope": "trustgate-federation-exchange"
}

Secret values should be retrieved only by authorized runtime components.

49. API Specification

49.1. Resolve Configuration

POST /api/trustgate/MEID_TRUST_CONFIG_RUNTIME/resolve

Request:

{
  "engine_meid": "MEID_TRUST_ROUTE_DECISION",
  "engine_cmi": "vera.TG-DECISION.ENGINE.ROUTER.1_0_0",
  "scope": {
    "environment": "production",
    "region": "eu-north-1",
    "tenant_id": "TEN-2026-0001",
    "eco_number": "ECO-A123",
    "signal_type": "supplier_invoice"
  },
  "purpose": "runtime_execution"
}

Response:

{
  "status": "resolved",
  "config_view_id": "TGCFGVIEW-2026-00001472",
  "config_snapshot_id": "TGCFGSNAP-2026-00001472",
  "config_digest": "sha256:4d6f8a...",
  "engine_view": {
    "decision_profile": "generic_assurance_decision_v1",
    "thresholds": {
      "accept_min_trust_score": 0.90,
      "accept_min_confidence": 0.85,
      "review_min_trust_score": 0.60
    },
    "replay_required": true,
    "dal_anchor_required": true
  }
}

50. API: Validate Configuration Change

POST /api/trustgate/MEID_TRUST_CONFIG_RUNTIME/validate-change

Request:

{
  "change_request_id": "TGCFGCR-2026-00001472",
  "scope": {
    "environment": "production",
    "tenant_id": "TEN-2026-0001"
  },
  "changes": [
    {
      "field": "decision.thresholds.accept.min_trust_score",
      "new_value": 0.88
    }
  ],
  "reason": "Controlled threshold adjustment after assurance review."
}

Response:

{
  "status": "validated",
  "requires_approval": true,
  "material_change": true,
  "safety_boundary_passed": true,
  "estimated_impact": {
    "affected_engines": [
      "MEID_TRUST_ROUTE_DECISION",
      "MEID_TRUST_SCORE_CALCULATOR"
    ],
    "requires_replay_snapshot": true,
    "requires_dal_anchor": true
  }
}

51. API: Publish Configuration

POST /api/trustgate/MEID_TRUST_CONFIG_RUNTIME/publish

Publishing requires approval and appropriate roles.

Response:

{
  "status": "published",
  "config_snapshot_id": "TGCFGSNAP-2026-00001472",
  "config_digest": "sha256:4d6f8a...",
  "activation": {
    "mode": "canary",
    "traffic_percentage": 10,
    "starts_at": "2026-06-25T16:30:00Z"
  }
}

52. CSI Contracts

52.1. Input CSIs

CSI	Required	Purpose
`comp.TG.INPUT.CONFIG-REQUEST.v1_0`	Yes	Configuration resolution request.
`comp.TG.INPUT.CONFIG-CHANGE-REQUEST.v1_0`	Conditional	Configuration change request.
`comp.FAGF.INPUT.POLICY-BUNDLE.v1_0`	Yes	Governance policy bundle.
`comp.ZAR.INPUT.ENGINE-REGISTRY.v1_0`	Yes	MEID/CMI registry data.
`comp.SSSR.INPUT.SCHEMA-SNAPSHOT.v1_0`	Conditional	Schema compatibility context.
`comp.EGFS.INPUT.FEDERATION-PROFILE.v1_0`	Conditional	Federation profile context.
`comp.DSAIL.INPUT.AI-GOVERNANCE-PROFILE.v1_0`	Conditional	AI governance profile.

52.2. Output CSIs

CSI	Purpose
`comp.TG.OUTPUT.RESOLVED-CONFIG.v1_0`	Resolved runtime configuration.
`comp.TG.OUTPUT.CONFIG-SNAPSHOT.v1_0`	Immutable configuration snapshot.
`comp.TG.OUTPUT.ENGINE-CONFIG-VIEW.v1_0`	Engine-specific configuration view.
`comp.TG.EVENT.CONFIG-RESOLVED.v1_0`	Configuration resolution event.
`comp.TG.EVENT.CONFIG-CHANGED.v1_0`	Configuration change event.
`comp.TG.EVENT.CONFIG-REJECTED.v1_0`	Configuration rejection event.
`comp.DAL.INPUT.ANCHOR-CANDIDATE.v1_0`	DAL anchor candidate.
`comp.AII.INPUT.CONFIG-TELEMETRY.v1_0`	AII configuration telemetry.

53. Failure Handling

Failure	Severity	Action
Missing request scope	Critical	Reject request.
Missing engine MEID	Critical	Reject request.
Unknown CMI	Critical	Reject in production.
Policy bundle unavailable	Critical	Use cached signed bundle or fail closed.
Invalid configuration schema	Critical	Reject configuration.
Safety boundary violation	Critical	Reject and audit.
Unauthorized override	Critical	Reject and audit.
Cache unavailable	Warning	Resolve directly from source stores.
ZAR unavailable	Critical	Use signed cache if valid, otherwise fail closed.
SSSR unavailable	Warning/Critical	Policy-dependent.
DAL unavailable	Warning	Queue anchor candidate.
Audit unavailable	Critical for material changes	Block material change.
Drift detected	Critical if production	Activate safe mode or escalate.

54. Observability Metrics

Metric	Description
`tg_config_resolve_total`	Total configuration resolution requests.
`tg_config_resolve_latency_ms`	Configuration resolution latency.
`tg_config_cache_hit_total`	Cache hits.
`tg_config_cache_miss_total`	Cache misses.
`tg_config_change_total`	Configuration changes.
`tg_config_reject_total`	Rejected configurations.
`tg_config_override_total`	Override evaluations.
`tg_config_drift_total`	Drift detections.
`tg_config_safe_mode_active`	Safe mode status.
`tg_config_snapshot_total`	Snapshots created.
`tg_config_dal_candidate_total`	DAL candidates emitted.

55. Performance Targets

Metric	Target
Cached config resolution	< 5 ms
Uncached config resolution	< 75 ms
Profile merge latency	< 30 ms
Safety validation latency	< 50 ms
Feature flag resolution	< 2 ms
Cache invalidation propagation	< 30 seconds regional
Emergency kill switch propagation	< 5 seconds
Snapshot creation latency	< 100 ms
Availability	99.99%
Replay determinism	100% with snapshots

56. Testing Requirements

The engine requires:

Test Type	Requirement
Schema Tests	Validate all configuration CSIs.
Merge Tests	Verify deterministic hierarchy resolution.
Override Tests	Verify allowed and rejected overrides.
Safety Tests	Verify safety boundaries cannot be bypassed.
Compatibility Tests	Verify MEID/CMI/CSI compatibility checks.
Replay Tests	Verify snapshot digest determinism.
Cache Tests	Verify cache hit, invalidation, and stale-read behavior.
Drift Tests	Verify drift detection across nodes and regions.
Security Tests	Verify RBAC, signing, secret handling, and audit.
Load Tests	Verify high-volume configuration resolution.
Rollback Tests	Verify safe rollback to known-good snapshots.

57. Deployment Model

Recommended deployment:

Configuration Sources
      │
      ├── ZAR
      ├── FAGF Policy Store
      ├── SSSR
      ├── Tenant Policy Store
      ├── Feature Flag Store
      └── Emergency Override Store
              │
              ▼
Runtime Configuration Engine
              │
              ├── Config Cache
              ├── Snapshot Store
              ├── Audit Publisher
              ├── DAL Candidate Publisher
              ├── VIZZ Feed Publisher
              └── Engine Config API

The engine should be deployed with regional read replicas and a strongly governed write path.

58. Developer Implementation Notes

Developers should implement the Runtime Configuration Engine as a deterministic configuration resolver with strong governance controls.

Recommended components:

request validator;
scope resolver;
policy bundle loader;
profile resolver;
deterministic merge engine;
override evaluator;
safety boundary validator;
MEID/CMI/CSI compatibility checker;
feature flag resolver;
configuration digest generator;
snapshot store;
cache manager;
invalidation publisher;
drift detector;
safe mode controller;
audit publisher;
DAL anchor candidate publisher;
VIZZ/AII telemetry publisher.

Every output should include config_snapshot_id and config_digest.

59. Implementation Anti-Patterns

Avoid:

Anti-Pattern	Risk
Hardcoded thresholds	Breaks replay and governance.
Environment-only configuration	Not audit-grade.
Unversioned YAML files	Cannot prove historical behavior.
Silent tenant overrides	Undermines assurance controls.
Live config during audit replay	Produces non-deterministic replay.
AI-driven config activation	Violates governance separation.
Unscoped feature flags	Creates cross-tenant risk.
Secrets in config payloads	Security exposure.
Non-audited emergency changes	Governance failure.
Stale regional config	Federation and replay inconsistency.

60. Summary

The TrustGate Runtime Configuration Engine is the governed configuration control plane for the TrustGate runtime.

It ensures that every TrustGate engine runs with explicit, versioned, validated, replayable, auditable, and policy-compliant configuration.

It is a foundational dependency for validation, scoring, decisions, quarantine, replay, DAL anchoring, federation exchange, AI governance, observability, scheduling, auditability, and regulatory assurance.

No Tier-0 TrustGate deployment should be considered production-ready unless runtime behavior is governed by this engine or an equivalent FAGF-authorized configuration control mechanism.

GitHub Repo Request for Change (RFC)

0. Identity​

1. Purpose​

2. Architectural Role​

3. Canonical Identity​

4. Why This Engine Is Critical​

5. Runtime Responsibilities​

6. Configuration Domains​

7. Runtime Configuration Hierarchy​

8. Override Rules​

9. Configuration Object Model​

10. Runtime Processing Pipeline​

11. Processing Algorithm​

12. Deterministic Merge Strategy​

13. Configuration Safety Boundaries​

14. Profile Types​

15. Engine-Specific Configuration Views​

16. Configuration Snapshot Model​

17. Configuration Digest​

18. Canonical Configuration Request​

19. Canonical Resolved Configuration​

20. Engine-Specific View Example​

21. Feature Flag Model​

22. Feature Flag Example​

23. Tenant Override Example​

24. Rejected Override Example​

25. Engine Compatibility​

26. Compatibility Example​

27. Configuration Lifecycle​

28. Configuration Change Control​

29. Configuration Change Event​

30. Configuration Rejection Event​

31. Cache Architecture​

32. Cache Invalidation​

33. Configuration Drift Detection​

34. Safe Mode​

35. Safe Mode Example​

36. Replay Behaviour​

37. DAL Integration​

38. Audit Log Integration​

39. Observability Integration​

40. AII Integration​

41. DSAIL Integration​

42. Federation Behaviour​

43. Federation Configuration Example​

44. AI Governance Configuration​

45. AI Governance Example​

46. Scheduler Configuration​

47. Security Requirements​

48. Secret Handling​

49. API Specification​

49.1. Resolve Configuration​

50. API: Validate Configuration Change​

51. API: Publish Configuration​

52. CSI Contracts​

52.1. Input CSIs​

52.2. Output CSIs​

53. Failure Handling​

54. Observability Metrics​

55. Performance Targets​

56. Testing Requirements​

57. Deployment Model​

58. Developer Implementation Notes​

59. Implementation Anti-Patterns​

60. Summary​

0. Identity

1. Purpose

2. Architectural Role

3. Canonical Identity

4. Why This Engine Is Critical

5. Runtime Responsibilities

6. Configuration Domains

7. Runtime Configuration Hierarchy

8. Override Rules

9. Configuration Object Model

10. Runtime Processing Pipeline

11. Processing Algorithm

12. Deterministic Merge Strategy

13. Configuration Safety Boundaries

14. Profile Types

15. Engine-Specific Configuration Views

16. Configuration Snapshot Model

17. Configuration Digest

18. Canonical Configuration Request

19. Canonical Resolved Configuration

20. Engine-Specific View Example

21. Feature Flag Model

22. Feature Flag Example

23. Tenant Override Example

24. Rejected Override Example

25. Engine Compatibility

26. Compatibility Example

27. Configuration Lifecycle

28. Configuration Change Control

29. Configuration Change Event

30. Configuration Rejection Event

31. Cache Architecture

32. Cache Invalidation

33. Configuration Drift Detection

34. Safe Mode

35. Safe Mode Example

36. Replay Behaviour

37. DAL Integration

38. Audit Log Integration

39. Observability Integration

40. AII Integration

41. DSAIL Integration

42. Federation Behaviour

43. Federation Configuration Example

44. AI Governance Configuration

45. AI Governance Example

46. Scheduler Configuration

47. Security Requirements

48. Secret Handling

49. API Specification

49.1. Resolve Configuration

50. API: Validate Configuration Change

51. API: Publish Configuration

52. CSI Contracts

52.1. Input CSIs

52.2. Output CSIs

53. Failure Handling

54. Observability Metrics

55. Performance Targets

56. Testing Requirements

57. Deployment Model

58. Developer Implementation Notes

59. Implementation Anti-Patterns

60. Summary