I Built a Claude Skill That Writes Tests For Me

Build a reusable Claude skill from scratch and make Claude follow your TDD workflow every time.

In this video, I walk you through creating a test-driven development skill for Claude Code. One markdown file, and Claude knows to write a failing test, generate minimal code to pass it, then refactor. Red-green-refactor, step by step. This is a skill I actually use in my workflow.

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What you'll learn:
What a Claude skill is and where it lives
How to write the description that triggers your skill
Building the TDD workflow instructions (outside-in, one test at a time)
Invoking and testing your skill in action

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Resources mentioned:
Agent Skills overview: https://agentskills.io/
Claude Code documentation: https://docs.anthropic.com/claude-code

Get the TDD skill file + my full collection of Claude workflows:
→ https://www.damiangalarza.com/newsletter

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Timestamps:
0:00 - Intro
0:26 - Create the skill file
1:11 - Write the description
1:44 - Build the TDD workflow
3:17 - Demo
6:28 - Recap

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About me:
I'm Damian Galarza, a software engineering leader and former CTO with 15+ years building SaaS products. I make practical AI tutorials and share what I'm learning about tools like Claude Code.

Connect:
Newsletter: https://www.damiangalarza.com/newsletter
Blog: https://www.damiangalarza.com

#ClaudeCode #AgentSkills #TDD #SoftwareEngineering #AIForDevelopers