Maid is a Ruby command-line tool and library that automates file organization and cleanup based on user-defined rules expressed in a Ruby DSL. It provides a suite of operations (move, trash, copy, rename, etc.) that can be combined with file metadata predicates (age, size, content type, download source, etc.) to systematically manage filesystems. The architecture is a traditional Ruby gem with a Thor-based CLI (bin/maid), a central Maid::Maid class that orchestrates rule loading and execution, and a set of tool methods mixed into the Maid instance for use in rule blocks. It also supports daemon mode using Listen (file system watcher) and rufus-scheduler (timed repeats). The code is well-structured with modular components, extensive test coverage, and modern Ruby practices, though it carries some legacy from supporting older Ruby versions. There is no data research or analytic component; it is purely an application for file automation.