MetaTag Genie is a macOS Stdio MCP service designed for writing image metadata, enhancing Spotlight search capabilities. AI agents or other applications needing local image metadata management can call this service, which communicates with clients via standard input/output (Stdio) and provides an interface compliant with the Machine Comprehension Protocol (MCP). It supports writing tags, descriptions, people (as keywords), and locations to JPG, PNG, and HEIC images.