Pipelight is a Rust-based CLI tool for defining and running automation pipelines. It allows users to create pipelines using TOML, YAML, HCL, or TypeScript configurations, trigger them via git hooks or file system changes, and monitor their execution. The architecture follows a modular design with separate crates for CLI parsing, workflow execution, configuration casting, process management, and utilities. Key features include process detachment for background execution, output capture for post-execution inspection, git hook integration, and file watching capabilities. The project demonstrates strong engineering practices with comprehensive error handling, cross-platform considerations, and thoughtful UX design for terminal interactions.