{
  "name": "VineyardObject",
  "description": "A Vineyard in-memory object with its identity, type, and lifecycle properties",
  "fields": [
    {
      "name": "id",
      "type": "string",
      "description": "64-bit ObjectID as hex string",
      "required": true
    },
    {
      "name": "typename",
      "type": "string",
      "description": "Fully qualified C++ type name (e.g., vineyard::Tensor<float64>)",
      "required": true
    },
    {
      "name": "nbytes",
      "type": "integer",
      "description": "Memory footprint in bytes",
      "required": true
    },
    {
      "name": "isglobal",
      "type": "boolean",
      "description": "Visible across the entire cluster",
      "required": false
    },
    {
      "name": "islocal",
      "type": "boolean",
      "description": "Local to the connected instance",
      "required": false
    },
    {
      "name": "instance_id",
      "type": "integer",
      "description": "Vineyard instance hosting this object",
      "required": false
    },
    {
      "name": "hostname",
      "type": "string",
      "description": "Hostname of the instance",
      "required": false
    },
    {
      "name": "signature",
      "type": "string",
      "description": "Content-addressable signature",
      "required": false
    }
  ]
}