{
  "$schema": "https://json-structure.org/meta/extended/v0/#",
  "name": "ChatMessage",
  "type": "object",
  "description": "A single message in a chat conversation.",
  "properties": {
    "role": {
      "type": "string",
      "description": "Role of the message author."
    },
    "content": {
      "type": "string",
      "description": "Content of the message."
    }
  }
}