YAML

YAML is a human-readable data serialization language that expresses structure through indentation.

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YAML is a data serialization language first proposed by Clark Evans in 2001. Its name is a recursive acronym for 'YAML Ain't Markup Language', and it represents keys, values and lists with indentation, colons and hyphens rather than brackets or tags.

In software development, YAML is widely used for configuration and deployment files. It is also the usual format for frontmatter, the metadata block such as a title and description placed at the top of a Markdown document.

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Claude Code registers skills by reading only the YAML frontmatter, the short header at the top of a skill file, rather than the whole file.


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