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A06 - Policy Engine

GroupTechnologyStatusServiceRoadmap phaseContracts
A - Governance, identity and securityOPA (Rego)open source integratedpolicies1policy-contract

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Role and responsibilities​

Evaluates Policy Contract requests and returns allow/deny with reasons and obligations.

Data model​

Tables (schema eai, every tenant table carries tenant_id uuid NOT NULL with an RLS policy on current_setting('app.tenant_id', true)::uuid): eai.policies, eai.policy_decisions, eai.audit_events.

API endpoints​

  • GET /v1/policies
  • POST /v1/policies
  • GET /v1/policies/{id}
  • PUT /v1/policies/{id}
  • DELETE /v1/policies/{id}
  • POST /v1/policies/evaluate
POST /v1/policies HTTP/1.1
Host: <control-plane-host>
X-API-Key: eai_xxx_secret
Accept-Language: en
Content-Type: application/json

{"name": "block-secret-data", "description": "Deny access to data classified secret", "engine": "builtin", "priority": 100, "status": "draft"}
{
  "id": "2a924df1-cbc2-44ab-90c4-149fbe12687c",
  "tenant_id": "18de5695-21f9-4053-a4ea-beb4bf2a5932",
  "name": "block-secret-data",
  "description": "Deny access to data classified secret",
  "version": "1.0.0",
  "engine": "builtin",
  "rego": null,
  "rules": [],
  "priority": 100,
  "status": "draft",
  "created_by": "alice",
  "created_at": "2026-10-30T02:35:52.728469+01:00",
  "updated_at": "2026-10-30T02:35:52.728469+01:00"
}

Errors use the common envelope {"error": {"code", "message", "message_i18n", "details", "request_id"}}; lists are paginated with limit and cursor.

SDK usage​

Python (enterprise_ai):

from enterprise_ai import EnterpriseAI

client = EnterpriseAI(base_url="<control-plane-url>", api_key="eai_xxx_secret")
items = client.policies.list()

TypeScript (@enterprise-ai/sdk):

import { EnterpriseAI } from "@enterprise-ai/sdk";

const eai = new EnterpriseAI({ baseUrl: "<control-plane-url>", apiKey: process.env.EAI_API_KEY });
const items = await eai.policies.list();

Java (enterprise-ai-java):

EnterpriseAIClient client = EnterpriseAIClient.builder()
    .baseUrl("<control-plane-url>")
    .apiKey(System.getenv("EAI_API_KEY"))
    .build();
var items = client.policies().list();

Go (enterprise-ai-go):

client, _ := eai.NewClient(eai.WithBaseURL("<control-plane-url>"), eai.WithAPIKey(os.Getenv("EAI_API_KEY")))
items, err := client.Policies.List(ctx)

Configuration​

  • Environment: EAI_DATABASE_URL, EAI_OTEL_EXPORTER_OTLP_ENDPOINT.
  • Helm values: controlPlane.enabled, controlPlane.replicas, controlPlane.resources, controlPlane.config.

Security controls​

  • Authentication by OIDC JWT, tenant API key with scopes, or SPIFFE mTLS; tenant resolved from the credential, never from the body.
  • Authorization through OpenFGA and OPA decisions; every mutation and decision writes a hash-chained eai.audit_events row.
  • Secrets never returned by the API; TLS everywhere; Cilium network policies restrict who can reach the service.

Observability​

  • Metrics: eai_policy_engine_requests_total, eai_policy_engine_errors_total, eai_policy_engine_latency_seconds (Prometheus).
  • Traces: OpenTelemetry spans eai.policies.* with W3C traceparent propagation, AI spans forwarded to Opik.
  • Audit actions: policy.create, policy.update, policy.delete, policy.simulate, policy.evaluate.

FinOps aspects​

Operating cost is allocated per tenant and project through labels on Usage Events and Kubernetes resource requests; no direct per-call cost.

Failure modes and resilience​

  • Stateless replicas behind the API Gateway, PostgreSQL HA for state; readiness probe GET /readyz removes unhealthy pods.
  • External system unavailable: fail closed for security decisions, explicit error code, no silent bypass.

Standalone adoption (client of a client)​

A client of a client can adopt this brick alone with the Python SDK sub-client client.policies (TS eai.policies, Java client.policies(), Go client.Policies). Minimal deployment: Control Plane API + PostgreSQL + Keycloak (or API keys), the Control Plane loads every domain of services/control-plane/src/eai/domains; the optional chart components are switched off in deploy/helm/enterprise-ai/values.yaml (vllm.enabled, qdrant.enabled, nats.enabled, workers.enabled).

Acceptance tests​

  1. A tenant cannot read or modify another tenant's resources (RLS test).
  2. Every mutation produces an audit event verifiable by GET /v1/audit/verify.
  3. Errors are returned in English and French according to Accept-Language.

Evidence on real components​

See the identity and policy plane guide: components started from the official releases (tools/iam/fetch.sh), tests services/control-plane/tests/test_iam_*.py.