{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "OAP Error Response Schema",
  "description": "Standardized error response format for Open Agent Passport API",
  "type": "object",
  "required": ["error", "timestamp"],
  "properties": {
    "error": {
      "type": "object",
      "required": ["code", "message"],
      "properties": {
        "code": {
          "type": "string",
          "description": "Machine-readable error code",
          "enum": [
            "validation_failed",
            "unauthorized",
            "forbidden",
            "not_found",
            "conflict",
            "rate_limit_exceeded",
            "internal_server_error",
            "service_unavailable",
            "invalid_passport",
            "invalid_signature",
            "timestamp_expired",
            "nonce_reused",
            "policy_denied",
            "capability_insufficient",
            "assurance_insufficient",
            "limit_exceeded",
            "region_restricted",
            "passport_suspended",
            "passport_revoked",
            "idempotency_conflict",
            "invalid_policy",
            "passport_not_found",
            "decision_expired",
            "signature_verification_failed",
            "transport_error"
          ]
        },
        "message": {
          "type": "string",
          "description": "Human-readable error message"
        },
        "details": {
          "type": "object",
          "description": "Additional error details",
          "additionalProperties": true
        },
        "field": {
          "type": "string",
          "description": "Field that caused the validation error"
        },
        "value": {
          "description": "Value that caused the validation error"
        },
        "suggestion": {
          "type": "string",
          "description": "Suggested fix for the error"
        }
      }
    },
    "timestamp": {
      "type": "string",
      "format": "date-time",
      "description": "ISO 8601 timestamp when the error occurred"
    },
    "request_id": {
      "type": "string",
      "description": "Unique identifier for the request that caused the error"
    },
    "path": {
      "type": "string",
      "description": "API path that caused the error"
    },
    "method": {
      "type": "string",
      "enum": ["GET", "POST", "PUT", "DELETE", "PATCH", "OPTIONS"],
      "description": "HTTP method that caused the error"
    },
    "status_code": {
      "type": "integer",
      "minimum": 400,
      "maximum": 599,
      "description": "HTTP status code"
    },
    "retry_after": {
      "type": "integer",
      "minimum": 1,
      "description": "Seconds to wait before retrying (for rate limit errors)"
    },
    "rate_limit_info": {
      "type": "object",
      "description": "Rate limiting information (for rate limit errors)",
      "properties": {
        "limit": {
          "type": "integer",
          "description": "Rate limit threshold"
        },
        "remaining": {
          "type": "integer",
          "description": "Remaining requests in current window"
        },
        "reset": {
          "type": "integer",
          "description": "Unix timestamp when rate limit resets"
        },
        "window": {
          "type": "integer",
          "description": "Rate limit window duration in seconds"
        }
      }
    },
    "documentation_url": {
      "type": "string",
      "format": "uri",
      "description": "URL to relevant documentation"
    },
    "support_url": {
      "type": "string",
      "format": "uri",
      "description": "URL to support or help"
    }
  },
  "examples": [
    {
      "error": {
        "code": "validation_failed",
        "message": "Name is required and must be between 1-100 characters",
        "field": "name",
        "value": "",
        "suggestion": "Provide a valid agent name between 1 and 100 characters"
      },
      "timestamp": "2025-01-16T10:30:00Z",
      "request_id": "req_123456789",
      "path": "/api/passports",
      "method": "POST",
      "status_code": 400
    },
    {
      "error": {
        "code": "rate_limit_exceeded",
        "message": "Too many requests, please try again later"
      },
      "timestamp": "2025-01-16T10:30:00Z",
      "request_id": "req_123456790",
      "path": "/api/verify/ap_a2d10232c6534523812423eec8a1425c",
      "method": "GET",
      "status_code": 429,
      "retry_after": 3600,
      "rate_limit_info": {
        "limit": 1000,
        "remaining": 0,
        "reset": 1640998800,
        "window": 3600
      }
    },
    {
      "error": {
        "code": "passport_not_found",
        "message": "Passport with ID ap_a2d10232c6534523812423eec8a1425c not found",
        "details": {
          "passport_id": "ap_a2d10232c6534523812423eec8a1425c",
          "suggestion": "Verify the passport ID is correct and the passport exists"
        }
      },
      "timestamp": "2025-01-16T10:30:00Z",
      "request_id": "req_123456791",
      "path": "/api/verify/ap_a2d10232c6534523812423eec8a1425c",
      "method": "GET",
      "status_code": 404
    },
    {
      "error": {
        "code": "policy_denied",
        "message": "Agent lacks required capabilities for this policy",
        "details": {
          "policy_id": "finance.payment.refund.v1",
          "required_capabilities": ["finance.payment.refund"],
          "agent_capabilities": ["data.export"]
        }
      },
      "timestamp": "2025-01-16T10:30:00Z",
      "request_id": "req_123456792",
      "path": "/api/verify/policy/finance.payment.refund.v1",
      "method": "POST",
      "status_code": 403
    }
  ]
}