semantic-release is a CLI tool and library that automates software release workflows based on semantic versioning and conventional commits. It analyzes commit messages since the last release to determine the next version number (major, minor, patch), generates release notes, creates a Git tag, and publishes the package to registries (npm, GitHub, etc.) via a plugin system. The architecture is modular: a core engine orchestrates plugin steps (verify conditions, analyze commits, generate notes, prepare, publish, notify) and supports multiple release branches, pre-releases, maintenance branches, and distribution channels. Plugins are loaded dynamically and can be configured via CLI arguments, configuration files, or shareable configurations. The codebase is written in modern JavaScript (ES modules) and has comprehensive test coverage including unit, integration, and end-to-end tests. It is actively maintained with a large community and is designed to be extended with custom plugins.