Ai Gateway Policy Structure

{
  "$schema": "https://json-structure.org/meta/core/v0/#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/ai-gateway/refs/heads/main/json-structure/ai-gateway-policy-structure.json",
  "name": "AIGatewayPolicy",
  "description": "A reusable AI gateway policy — guardrail, cost control, rate limit, access rule, data-residency constraint, audit configuration, or transformation — attachable to routes, tenants, or virtual keys.",
  "type": "object",
  "properties": {
    "policyId": { "type": "string", "example": "pii-redaction-default" },
    "name": { "type": "string", "example": "PII Redaction" },
    "kind": { "type": "string", "example": "guardrail" },
    "stage": { "type": "string", "example": "both" },
    "scope": { "type": "string", "example": "tenant" },
    "guardrail": {
      "type": "object",
      "properties": {
        "type": { "type": "string", "example": "pii" },
        "categories": {
          "type": "array",
          "items": { "type": "string" }
        },
        "action": { "type": "string", "example": "redact" },
        "engine": { "type": "string", "example": "presidio" }
      }
    },
    "cost": {
      "type": "object",
      "properties": {
        "limit": { "type": "float", "example": 1000.0 },
        "currency": { "type": "string", "example": "USD" },
        "period": { "type": "string", "example": "monthly" },
        "action": { "type": "string", "example": "block" }
      }
    },
    "rateLimit": {
      "type": "object",
      "properties": {
        "requestsPerMinute": { "type": "int32", "example": 600 },
        "tokensPerMinute": { "type": "int32", "example": 200000 },
        "concurrency": { "type": "int32", "example": 32 }
      }
    },
    "access": {
      "type": "object",
      "properties": {
        "roles": {
          "type": "array",
          "items": { "type": "string" }
        },
        "allowedModels": {
          "type": "array",
          "items": { "type": "string" }
        },
        "deniedModels": {
          "type": "array",
          "items": { "type": "string" }
        }
      }
    },
    "dataResidency": {
      "type": "object",
      "properties": {
        "allowedRegions": {
          "type": "array",
          "items": { "type": "string" }
        },
        "deniedProviders": {
          "type": "array",
          "items": { "type": "string" }
        }
      }
    },
    "audit": {
      "type": "object",
      "properties": {
        "logRequestBody": { "type": "boolean", "example": true },
        "logResponseBody": { "type": "boolean", "example": true },
        "retentionDays": { "type": "int32", "example": 90 },
        "sink": { "type": "string", "example": "s3://ai-audit-logs/prod" }
      }
    },
    "enabled": { "type": "boolean", "example": true }
  },
  "required": ["policyId", "kind", "stage", "scope"]
}