Conciseness

The body is lean, imperative, and free of explanations of concepts Claude already knows; every section is directive. Minor over-explanation remains: the shadcn-owns-contract / Plate-owns-content boundary is stated three times (Ownership lists, the 'Important boundary' bullets, and 'Current Divergences'), so anchor 4 fits better than 5.

Actionability

As an instruction-only skill it provides concrete, specific guidance throughout: exact paths (apps/www/src/registry/*, tooling/scripts/update-template.sh), the rewrite rule with a concrete URL base (https://platejs.org/r/*.json), bare-name dependency examples (button, command, popover), and explicit precedence rules. Per the rubric's scoring notes, absence of code is not penalized when guidance is this actionable; the decision rules cover the common cases fully.

Workflow Clarity

The decision workflow is unambiguous — explicit precedence ("upstream schema first... Plate divergence only when the repo has a real constraint"), a validation checkpoint ("compare Plate output against ../shadcn before inventing a custom rule"), and a Red Flags stop-and-reassess checklist. It is not a 5 because there is no ordered step sequence or fix-and-retry feedback loop; not a 3 because checkpoints are explicitly present rather than implicit.

Progressive Disclosure

A single self-contained file with clear, well-ordered sections (Core Contract, Ownership, Registry Rules, Template Rules, Current Divergences, Red Flags) and no nested references. It does not reach 5 because at ~135 lines it exceeds the under-50-line simple-skill exception, and the registry dependency rules are a plausible candidate for a separate reference file if the skill grows.

Specificity

"Clone shadcn implementation patterns with source-by-source parity" names the domain and one concrete action (cloning patterns with parity), but does not enumerate several specific actions, matching the anchor 'Names domain and 1-2 concrete actions, but not comprehensive'. It is not a 4 because no additional distinct capabilities are listed; not a 2 because the action is concrete rather than generic.

Completeness

It explicitly answers both what ("Clone shadcn implementation patterns with source-by-source parity") and when ("Use when the user says 'shadcn parity', asks to mirror shadcn, copy shadcn UX/architecture/tests, or wants more than inspiration") with concrete trigger phrases, exactly matching the anchor-5 example pattern.

Trigger Term Quality

Natural trigger phrases are well covered: "shadcn parity", "mirror shadcn", "copy shadcn UX/architecture/tests", and "wants more than inspiration" — phrasings a user would plausibly say. A few natural synonyms (e.g., "match shadcn", "replicate shadcn") are missing, so it fits anchor 4 rather than comprehensive coverage at 5.

Distinctiveness Conflict Risk

A clear niche (shadcn parity, explicitly contrasted with looser intents via "or wants more than inspiration") with distinct triggers; minimal overlap with any other skill. Not a 4 because no meaningful overlap risk with closely related skills exists.