{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "cfn-loop-communication/broadcast-message/v1.0.0",
  "title": "Broadcast Message Schema",
  "description": "Schema for coordinator broadcast messages (Integration Point 3.4)",
  "type": "object",
  "required": ["message_id", "task_id", "iteration", "message_type", "content"],
  "properties": {
    "message_id": {
      "type": "string",
      "description": "Unique message identifier",
      "pattern": "^msg-[a-z0-9-]+$"
    },
    "task_id": {
      "type": "string",
      "description": "Task identifier",
      "pattern": "^task-[a-z0-9-]+$"
    },
    "iteration": {
      "type": "integer",
      "description": "Current iteration number",
      "minimum": 1
    },
    "message_type": {
      "type": "string",
      "description": "Type of broadcast message",
      "enum": ["context", "feedback", "instruction", "warning"]
    },
    "content": {
      "type": "object",
      "description": "Message content (structure varies by type)"
    },
    "timestamp": {
      "type": "string",
      "format": "date-time",
      "description": "When message was sent"
    },
    "priority": {
      "type": "string",
      "enum": ["low", "normal", "high"],
      "default": "normal"
    }
  },
  "additionalProperties": false
}