The Brain Service is a Python-based WebSocket application designed to power intelligent applications, such as auto-movie generation, by offering advanced character management. It allows users to create and store characters with detailed personality and appearance descriptions. Leveraging a custom embedding service and optionally Neo4j, the tool automatically generates text embeddings for these characters, enabling sophisticated semantic search functionality to find similar characters using natural language queries. Its real-time Model Context Protocol (MCP) communication and project isolation features ensure efficient and secure character data handling, with optimized performance for rapid semantic search responses.