Docker Captain builds first SBX mixin kit to automate MLflow sandbox setup

Yhary, a Docker Captain and AI Engineer from Colombia, built his first Docker Sandbox Kit (SBX Kit) as part of a Docker Captains community activity. An SBX Kit is a declarative YAML file that automatically configures a sandbox environment at creation time, eliminating repetitive manual setup and configuration drift. He created a mixin kit designed to layer MLflow tracking server capabilities onto an existing Claude Code agent, enabling ML experiment logging and model versioning out of the box. The project followed a structured approach separating heavy dependencies into a Dockerfile from dynamic configurations kept in the YAML spec. The guide documents the full build process, including errors encountered, offering a practical reference for engineers looking to create reproducible AI development environments.