SKILL.md Generator & Validator
A SKILL.md file packages reusable instructions for Claude Skills: a YAML frontmatter block (name, description, optional license) followed by markdown instructions. This free tool builds a correctly formatted SKILL.md from a form and validates the frontmatter before you download it — no signup, runs entirely in your browser.
Why validate a SKILL.md instead of hand-writing it
The frontmatter is YAML, and YAML breaks silently on things people write without thinking twice — a colon inside a description, an unescaped quote, a name with a space in it. Claude also relies entirely on the description field to decide when to trigger the skill, so a description that's too short or too vague means the skill just never fires. This tool catches both classes of mistake before you save the file.
Worked example
Fill in a name of pdf-form-filler and a description with an embedded colon and quotes:
Handles "edge cases" like colons: and quotes.The generator automatically quotes and escapes it in the output:
description: "Handles \"edge cases\" like colons: and quotes."FAQ
What is a SKILL.md file?
SKILL.md is the file format Claude Skills use to package reusable instructions. It has a YAML frontmatter block with a name and description, followed by markdown instructions Claude follows when the skill triggers.
How does Claude decide when to use a skill?
Claude matches the user’s request against the description field in the frontmatter, so the description needs to say both what the skill does and when it applies — not just a short label.
Does the name field have rules?
Yes — it should be kebab-case (lowercase letters, digits, and hyphens only) since it is used as an identifier. This tool validates that for you before you download.
Is my data uploaded anywhere?
No. This generator runs entirely in your browser with plain JavaScript — nothing you type is sent to a server.