Agent Skills in a Day : Build Reusable AI Capabilities

Claude Skills are the simplest way to make Claude reliably do what you need — every time, without re-explaining yourself. In this course, you will go from writing your very first SKILL file to building multi-file Skills with validator scripts, reference libraries, and structured workflows that Claude loads automatically.

The course is structured around four progressive modules, each grounded in hands-on labs. You will start with the fundamentals of the Skills architecture, move into building single-file and multi-file custom Skills, and finish with evaluation-driven best practices used in production environments. Every concept is paired with a working lab you can keep and adapt after the course.

What Will Students Learn?

- How Claude Skills work — the filesystem-based, demand-loaded model that makes them composable and efficient

- The exact YAML frontmatter rules that control when a Skill triggers and what Claude is allowed to do

- How to write a SKILL that is precise enough to trigger correctly and flexible enough to handle real-world variation

- The difference between Skills, MCP servers, and Agents — and how to choose the right tool for each job

- How to structure multi-file Skills with REFERENCE, domain sub-folders, and supporting scripts

- The plan-validate-execute pattern for Skills that interact with data files or external tools

- How to write and wire in helper scripts (Python) that reduce context noise and handle input validation

- How to evaluate a Skill against a structured rubric and iterate until it meets a production bar

- How to deploy Skills across Claude Code, claude ai, and the Claude API