Glossary
SKILL.md
Quick answer
SKILL.md is the entry file of a Claude Code skill: YAML frontmatter (a name and a description) followed by a markdown body of instructions the agent reads and follows when the skill applies.
The description is how the agent decides when to load the skill, so it should be a crisp one or two sentences. Loreto’s free SKILL.md linter validates the frontmatter, naming, and structure for you.
Turn this into a skill your agent can run
Loreto packages any workflow or source into a production-ready Claude Code skill.