amber-laravel/app/Repositories/LLM/ChatEnum.php

<?php

namespace App\Repositories\LLM;

enum ChatEnum: string
{
    case Assistant = 'assistant';
    case AssistantChunk = 'assistant_chunk';
    case AssistantToolCall = 'assistant_tool_call';
    case Tool = 'tool';
    case Human = 'user';
    case System = 'system';
}