UserMessageContent

type UserMessageContent =
  | {
      text: string;
      type: 'input_text';
    }
  | {
      data?: Record<string, unknown>;
      group?: string;
      id: string;
      interactive?: boolean;
      text: string;
      type: 'input_tag';
    };

Structured user input segments for sending rich content (text or tags). Mirrors the UserMessageContent union from the chatkit-python SDK.