What Is SKILL.md? Building a Reusable Playwright Testing Skill for Claude Code

Short summary

This tutorial explains SKILL.md, a markdown-based format that lets Claude Code load instructions on-demand only when relevant to the current task. It walks through building a Playwright form-testing skill with YAML frontmatter and step-by-step instructions. Skills keep context lean, are token-efficient, and can be committed to repos for team-wide consistency.

• •SKILL.md packages instructions Claude loads only when relevant, unlike always-on CLAUDE.md
• •Walks through a real Playwright form-testing skill with YAML frontmatter and markdown body
• •Skills are portable, token-efficient, and shareable across projects and agent tools

Generated with AI, which can make mistakes.