SKILL.md Explained: How to Build Reusable Playwright Testing Skills for Claude Code

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SKILL.md is a markdown-based file format used in Claude Code that packages reusable testing instructions into on-demand skills, loading only when relevant to a task. Each skill lives in a dedicated folder under .claude/skills/ and contains YAML frontmatter with a name and description, followed by plain markdown instructions. The description field is critical, as Claude reads all installed skill descriptions at session start to determine which to activate for a given request. This approach keeps token usage low, reduces repeated explanations across sessions, and ensures consistent testing conventions across teams once committed to a shared repository. The format is portable and works across projects and other agent tools, requiring no special syntax beyond natural-language requests to trigger the correct skill.

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