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Use when reviewing SKILL.md files for structure and trigger quality.
Passed 21 of 22 test cases with the skill, and 12 of 22 without it.
and 8 more in the full report
10 fixed11 passed either way0 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 10 test cases the skill fixed. Same model, same prompt, with and without the skill.
Which placeholder variable should be used inside instructions to pass all command-line arguments provided by the user during invocation?
| Checked | Without skill | With skill |
|---|---|---|
| Specifies `$ARGUMENTS` as the placeholder variable. | Missed | Passed |
The instructions your model reads when the skill loads.
Analyze skill definitions for trigger quality, structure, and discoverability.
| Field | Required | Description | Validation |
|---|---|---|---|
name | No | Display name, defaults to directory name | lowercase, max 64 chars |
description | Recommended | What skill does and when to use | max 1024 chars, should include trigger |
argument-hint | No | Autocomplete hint, e.g., [file-path] | keep under 30 chars |
disable-model-invocation | No | true = manual only (for side effects) | boolean, default false |
user-invocable | No | false = hidden from / menu (auto-only) | boolean, default true |
allowed-tools | No | Tools Claude can use without permission | comma-separated list |
model | No | Specific model when skill is active | opus, sonnet, haiku |
context | No | fork = run in isolated subagent context | fork or omit |
agent | No | Subagent type for execution | Explore, Plan, general-purpose |
hooks | No | Skill-scoped lifecycle hooks | PreToolUse, PostToolUse |
skills/my-skill/
├── SKILL.md # Required - core definition (under 500 lines)
├── reference.md # Optional - detailed documentation
├── examples.md # Optional - usage examples
└── scripts/ # Optional - helper scripts
test cases passed, vs 12 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.