Install any skill in seconds. Free to start, no credit card required.
Get Started Free →agent-sh/unknown-frontmatter-field
Use when validating frontmatter keys
Passed 10 of 15 test cases with the skill, and 10 of 15 without it.
1 fixed14 passed either way7 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
A test case the skill fixed. Same model, same prompt, with and without the skill.
In our Lume static site, `posts/first.md` has frontmatter `title: First`, `type: post`, and `deprecated_header: true`. Validate the frontmatter block and summarize any issues.
| Checked | Without skill | With skill |
|---|---|---|
| Identifies deprecated_header as the invalid frontmatter attribute. | Missed | Passed |
The instructions your model reads when the skill loads.
Run frontmatter validation.
test cases passed, vs 10 / 15 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.