It assumes Claude's competence (no explaining what tests or coverage are) and is mostly efficient, but the repeated ISTQB quotation framing and discursive grounding pointers add tokens that could be tightened, matching the score-2 'mostly efficient but could be tightened' anchor rather than a fully lean 3.

It gives fully concrete, executable guidance — a literal-clustering heuristic table, explicit PASS/SHALLOW/n/a verdict rules per axis, a negative_assertion_ratio formula, and a copy-ready output-format template — satisfying the score-3 anchor for specific, actionable instruction.

A clear five-step sequence with explicit checkpoints — 'Score all three axes before deciding anything', n/a-as-validation-guard rules, and the evidence-required rule — provides the feedback loops and guards the score-3 anchor calls for.

SKILL.md is an overview with verbatim quotations and the full worked example split into one-level-deep, clearly linked references (grounding.md, worked-example.md), both of which exist as real bundle files — matching the score-3 anchor.

Lists multiple concrete actions per axis — "clustering the literal values", "computing the negative-assertion ratio", and "Emits a PASS / SHALLOW / N/A verdict per axis" — matching the score-3 anchor for multiple specific concrete actions.

It explicitly answers both what it does (audits three axes, emits verdicts with evidence) and when to use it via a clear "Use when..." clause, satisfying the score-3 anchor.

It surfaces natural phrasings ("cases all look alike", "every argument the same shape", "every response a success", "no thrown-error case"), but these are framed abstractly rather than as the breadth of shorthand a user would utter, missing common variations — closer to the score-2 anchor than the multi-variant score-3 example.

It carves a clear niche — input-domain coverage — and explicitly hands matcher specificity off to `test-code-conventions`, so it is unlikely to trigger for the wrong skill.