This workshop introduces reusable skill packages as a way to provide AI agents with structured, domain-specific guidance for clinical programming. Participants examine the components of a skill, including SKILL.md instructions written in YAML and Markdown, supporting scripts, templates, and reference materials. The session explains why modular instructions matter and how reusable skills can organize specialized knowledge for recurring tasks. Hands-on work uses Claude to build skills and considers their application in development environments such as Claude Code, Cursor, and Positron. Participants gain a practical starting point for designing agent instructions that can be maintained and reused across related programming workflows.