{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "MessageParam",
  "type": "object",
  "description": "An input message in the conversation.",
  "properties": {
    "role": {
      "type": "string",
      "description": "The role of the message author."
    },
    "content": {
      "type": "string",
      "description": "The content of the message. Can be a string or array of content blocks."
    }
  }
}