Conciseness

The body is lean and command-first with no concept explanations Claude already knows, but the opening line 'This skill uses bash commands and config files but no application languages' restates the frontmatter's meta-purpose, and the YAML and JSON config blocks are duplicative. Anchor 4 (efficient, minor over-content) fits better than 5, where every token would earn its place.

Actionability

Commands are concrete and executable as written: 'brew install jq yq', complete config blocks, and './start.sh --config config.yaml'. It is not a 5 because start.sh is not provided anywhere in the bundle and no common-case variations are covered, leaving a minor gap.

Workflow Clarity

Setup -> Configuration -> Running is a clearly sequenced, executable three-step workflow with each step's command given. There are no validation checkpoints (e.g., verifying the service is up), so it fits anchor 4 rather than 5; the simple-skill 5 exception does not fully apply since this is a multi-step process, though nothing destructive/batch triggers the cap at 3.

Progressive Disclosure

The skill is under 50 lines, self-contained with no bundle files needed, and organized under clear section headers (Setup, Configuration, Running). Per the simple-skill guideline, this matches anchor 5 — well-organized sections with no nested or buried references.

Specificity

The description 'A skill that uses only shell and config code blocks for testing contamination' names a domain (shell and config code blocks) but describes composition rather than any concrete capability or action. It matches anchor 2 (names the domain, minimal/generic actions) — not 3, which requires 1-2 concrete actions, and not 1, since it is not pure abstract language.

Completeness

The 'what' is vague — it states what the skill is composed of, not what it does — and there is no 'when to use' guidance at all. Per the guideline, the missing 'Use when...' clause caps completeness at 3; it lands at 2 (vague what, no when) because the what itself never states a capability.

Trigger Term Quality

Terms like 'shell', 'config code blocks', and 'testing contamination' are technical/meta jargon; no natural phrases a user would say when needing this skill are present. Fits anchor 2 (one or two generic keywords, missing natural phrases) rather than 1, since 'shell' and 'config' are not entirely generic.

Distinctiveness Conflict Risk

'Uses only shell and config code blocks' is somewhat specific and the 'testing contamination' framing gives it a niche, but it would still overlap with any shell/config or testing skill. Fits anchor 3 (somewhat specific, could overlap) — not 4, since no distinct trigger phrases delineate it from related skills.