Tarot Cards is an AI-based service that provides users with tarot card reading results using OpenAI's language model. It selects cards randomly from a deck of 78 cards, determines orientation or reversal, and chooses from among several buckets to generate a new context for each reading. By reusing previously generated results quickly through a caching system, the service optimizes API call costs and response speed while being designed to produce diverse readings based on keyword-based context transmission, even if the same card, orientation, and bucket combination are used.