Conciseness

Every sentence instructs ("The repo's convention wins", "'Fast' or 'intuitive' is a goal at best, never a criterion", "Zero silent inventions") and the brief rationale clauses serve enforcement, not concept explanation Claude already knows. Nothing trimmable was found, matching the lean anchor rather than the minor-trims anchor at 4.

Actionability

Fully actionable instruction-only guidance: concrete drafting rules ("The overview's first sentence says what the feature does for its user", "new criteria take fresh IDs, removed ones leave holes"), a runnable command ("Run `<plugin root>/scripts/prose-lint.py` on the spec file"), templates delegated to references/format.md at the exact step they are needed, and a checkable Definition of Done. Per the rubric's code-vs-instruction note, absence of code is not penalized.

Workflow Clarity

Six clearly sequenced steps with explicit validation (step 5: "Every goal is covered by at least one criterion… fix every finding"), a validate-fix loop enforced by the DoD ("passes prose-lint.py with no findings"), hard gates ("Then wait"; "the user signs off before anything downstream builds on it"), and a Definition of Done checklist — matching the anchor requiring explicit validation, feedback, and checklists.

Progressive Disclosure

The body is a well-signaled overview: a references table giving file, read-timing ("step 1, when the repo has no spec convention"), and contents, with the timing restated in the workflow ("Read `../../assets/writing.md` first"). references/format.md was verified to exist, be one level deep, and hold exactly what the table claims; the plugin-root-relative paths are explicitly defined ("`<plugin root>` is two directories above it") and resolve outside this bundle copy by design.

Specificity

Enumerates multiple concrete deliverables — "goals, non-goals, testable acceptance criteria with stable IDs, invariants — that later skills cite by path and ID" — comprehensively covering what the skill produces. Not 4: there is no coverage gap; the artifact's full contents are named, not just the domain.

Completeness

Explicitly answers both questions: a clear what ("Turn a fuzzy feature request into a reviewable product spec…") and an explicit "Use when…" clause with concrete trigger phrases. Not 4: the when is fully explicit with quoted user phrasings, not merely present.

Trigger Term Quality

Covers the literal command ("/spec"), casual ("spec this out"), formal ("write a product spec"), a synonym ("turn this idea into requirements"), and a situational condition ("brings a feature request that needs a contract before planning or building"). This is comprehensive natural-term coverage for the domain; no file-extension vocabulary applies.

Distinctiveness Conflict Risk

Clear niche — a product-level spec with stable IDs that later skills cite — with the distinct "/spec" trigger and explicit positioning "before planning or building" that separates it from planning/building skills. Minimal conflict risk.