{
  "name": "TIAA Account",
  "description": "Structure documentation for TIAA FDX account objects",
  "fields": [
    {
      "name": "accountId",
      "type": "string",
      "required": true,
      "description": "Unique account identifier"
    },
    {
      "name": "accountType",
      "type": "enum",
      "required": true,
      "values": ["INVESTMENT", "RETIREMENT", "ANNUITY", "BROKERAGE"],
      "description": "Classification of the account"
    },
    {
      "name": "displayName",
      "type": "string",
      "required": true,
      "description": "Human-readable account name (e.g., 'TIAA 403(b) Retirement Account')"
    },
    {
      "name": "accountNumber",
      "type": "string",
      "required": false,
      "description": "Masked account number (last 4 digits visible)"
    },
    {
      "name": "balanceAsOf",
      "type": "string (date-time)",
      "required": false,
      "description": "ISO 8601 timestamp indicating when the balance was last calculated"
    },
    {
      "name": "currentBalance",
      "type": "number",
      "required": true,
      "description": "Current account balance in the account currency"
    },
    {
      "name": "currency",
      "type": "string",
      "required": false,
      "default": "USD",
      "description": "ISO 4217 currency code"
    },
    {
      "name": "status",
      "type": "enum",
      "required": true,
      "values": ["OPEN", "CLOSED", "PENDING"],
      "description": "Current status of the account"
    }
  ]
}