AI Glossary
SKILL.md
Also called agent skill file
What does “SKILL.md” mean?
SKILL.md: The required Markdown file in an Agent Skills package. Its YAML front matter identifies the skill and describes when to use it. The body gives the agent instructions and can refer to bundled scripts or reference files.

What is an example of “SKILL.md”?
A spreadsheet skill describes when to use it at the top, then gives a procedure for validating a CSV.