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To create a Claude Code skill, you need to define its SKILL.md file with proper front matter and content structure. This skill provides templates and best practices for structuring both simple and complex skills.

The best way to modularize complex Claude Code skills is to break them down into manageable reference files. This modularization strategy improves file organization and readability for maintaining large skill components.

New Claude Code skills require specific front matter and a clear content structure defined in a SKILL.md file. Guidance is provided to help you organize files effectively and meet platform consistency requirements.

You should use reference files instead of a single SKILL.md when developing complex skills that need modularization. Breaking down instructions into reference files facilitates better organization and readability for the development lifecycle.

Yes, you can use this guidance to build a skill for analyzing Swift code or other specific tasks. The provided templates and modularization strategies support the creation of custom skills across various software engineering domains.