Observed arrival · 2026-10-25

SKILL.md Validator

skillmdvalidator.com Visit website

Editorial interest 78/100 Selection signal · not a rating of the site

A browser-based checker for Agent Skills files, with frontmatter validation, token-cost estimates, and security-pattern warnings.

Landing page captured for the 2026-10-25 issue.

For: People writing or reviewing Agent Skills files
Worth noticing: Its sample problem file pairs an invalid name with wildcard permissions and a `curl | bash` instruction.

Field notes

The page presents the Agent Skills format as YAML frontmatter followed by Markdown instructions, with optional scripts, references, and assets. Its rules table distinguishes enforced errors from security warnings and best-practice suggestions. The sample problem file combines a folder/name issue with wildcard allowed-tools and a shell-piping pattern; the page also estimates the recurring token cost of name and description metadata.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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