Conciseness

The body is dense, declarative, and assumes Claude's competence — tables, checklists, and output templates with zero explanation of concepts Claude already knows. It falls short of 5 because of redundancy: the "Slate Plan Performance Pass" question list and the "Plate Example" largely restate the Required Output fields and Blockers rows, which could be consolidated.

Actionability

Copy-paste-ready output templates ("### Performance" block with 13 concrete fields), a 9-step numbered Quick Pass, a symptom→rule-family selection table, and a fully worked 10k-document example make the guidance executable as written. It matches the score-5 anchor: specific examples cover the common cases end to end.

Workflow Clarity

The Quick Pass is a clearly sequenced 9-step workflow, the Blockers table acts as an explicit validation checklist ("Stop the performance claim or mark the plan incomplete when any required answer is missing", "Silence is not a pass"), and the No-Change Defense provides the error/fallback path requiring cited evidence. Sequence, checkpoints, and a feedback path are all present, matching the score-5 anchor.

Progressive Disclosure

The in-file structure is good — 15 rule links in a single one-level-deep table, each row carrying a "Use when" trigger — but every referenced file (e.g. ./rules/cohort-segmentation.md, ./rules/repeated-unit-budget.md) is absent from the bundle; no rules/ directory exists. Navigation dead-ends on all 15 links, which is a structural failure not captured by the score-3 anchor's "references present but not clearly signaled"; it sits closer to the score-2 anchor where the structure fails to deliver navigable content.

Specificity

The description enumerates seven concrete actions — "cohort segmentation, repeated-unit budgets, interaction-level INP, memory tagging, degradation contracts, browser trace proof, and production dashboards" — giving comprehensive, specific coverage of what the skill does. It is well above the score-4 anchor ("several specific actions; minor gaps") since nothing is generic filler.

Completeness

The "what" is clear and detailed, but there is no "Use when..." clause or equivalent explicit trigger guidance anywhere in the description, which caps completeness at 3 per the judging guidelines. It is not a 2 because the "what" is concrete and multi-part, not vague.

Trigger Term Quality

"performance", "memory", "dashboards", and "INP" are terms a perf-focused user might say, but the description leans on internal jargon users would not naturally utter ("GitHub-scale tactics", "cohort segmentation", "repeated-unit budgets", "degradation contracts") and misses common variations like "slow", "lag", "large document", or "virtualization". This matches the score-3 anchor (some relevant keywords, missing common variations/synonyms) rather than 4, which requires near-complete natural-term coverage.

Distinctiveness Conflict Risk

"not owned by Vercel React rules" plus the tactic list carves out a distinct lane and explicitly delimits against sibling skills, so it is mostly distinct. It falls short of 5 because "Review performance lanes with GitHub-scale tactics" is org-internal phrasing that could still overlap with a generic React-performance skill for an unfamiliar user.