{
  "type": "object",
  "properties": {
    "items": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "task": { "type": "string" },
          "owner": { "type": ["string", "null"] },
          "due_date": { "type": ["string", "null"] },
          "evidence": { "type": "string" }
        },
        "required": ["task", "owner", "due_date", "evidence"],
        "additionalProperties": false
      }
    }
  },
  "required": ["items"],
  "additionalProperties": false
}