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Guide for creating new Agent Skills.
Passed 21 of 22 test cases with the skill, and 16 of 22 without it.
and 3 more in the full report
5 fixed16 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 5 test cases the skill fixed. Same model, same prompt, with and without the skill.
Write the metadata frontmatter for a PDF compression tool skill. I want the description field to say: 'Use this skill when you need to shrink large PDF files for email attachments.'
| Checked | Without skill | With skill |
|---|---|---|
| Rephrases the description to begin with 'This skill should be used when'. | Missed | Passed |
The instructions your model reads when the skill loads.
This skill provides guidance for creating effective skills.
Skills are modular, self-contained packages that extend Claude's capabilities by providing specialized knowledge, workflows, and tools. Think of them as "onboarding guides" for specific domains or tasks—they transform Claude from a general-purpose agent into a specialized agent equipped with procedural knowledge that no model can fully possess.
Every skill consists of a required SKILL.md file and optional bundled resources:
skill-name/
├── SKILL.md (required)
│ ├── YAML frontmatter metadata (required)
│ │ ├── name: (required)
│ │ ├── description: (required)
│ │ └── allowed-tools: (optional)
│ └── Markdown instructions (required)
└── Bundled Resources (optional)
├── scripts/ - Executable code (Python/Bash/etc.)
├── references/ - Documentation loaded into context as needed
└── assets/ - Files used in output (templates, icons, fonts, etc.)
Metadata Quality: The name and description in YAML frontmatter determine when Claude will use the skill. Be specific about what the skill does and when to use it. Use third-person form (e.g., "This skill should be used when..." instead of "Use this skill when...").
allowed-tools (optional): Restricts which tools Claude can use within the skill. Leave empty to allow all tools (recommended unless restriction is needed).
test cases passed, vs 16 / 22 without
Published skills whose descriptions closely match this one, with their headline benchmark lift.
More skills from the same source and nearby in the registry, with their headline benchmark lift.