Agent Skills in a Day:Build Reusable AI Capabilities

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
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
Requirements
Claude Code installed or a claude ai Pro, Max, Team, or Enterprise account with code execution enabled
Comfort working in a terminal and editing plain-text files
Basic familiarity with Python (Module 3 and beyond); no advanced Python is required
No prior experience with Claude Skills is assumed
Description
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
Who this course is for
Developers who use Claude Code daily and want repeatable, project-specific workflows baked in
Team leads and technical leads who want to package team conventions - code review checklists, data schemas, brand guidelines - so every teammate benefits automatically
Prompt engineers who are ready to graduate from one-off prompts to structured, versioned, reusable capabilities
AI practitioners building internal tooling on top of Claude who want lightweight automation without the overhead of a full agent framework