Conciseness

The body is mostly lean — short sectioned bullets, no padded prose — but the opening paragraph ('JS must be parsed and compiled before execution') and the 'Explain' section restate concepts Claude already knows. This fits 'efficient; minor instances of over-explanation that could be trimmed' rather than 5, where every token would earn its place.

Actionability

Guidance is directional but not executable in the body: 'Convert the identified static imports to dynamic imports using import()' names the mechanism without showing syntax, and 'Analyze your bundle with a visualizer' names no tool — all executable code is deferred to references/rule.md. This matches 'some concrete guidance but incomplete; missing key details' rather than 4, which requires concrete code or commands with only minor gaps.

Workflow Clarity

The Check → Fix → Explain sections imply a sequence but it is never explicitly ordered, and the body contains no verification step (the 'Verification' section in references/rule.md is never surfaced). Fits 'sequence present but checkpoints missing or implicit'; a 4 would require explicit steps with most checkpoints present.

Progressive Disclosure

The body is a concise, well-organized overview that defers implementation details, code examples, and framework guidance to a single one-level-deep reference (references/rule.md, which exists and contains exactly that content), clearly signaled at the end. This matches the 'clear overview with well-signaled one-level-deep references; content appropriately split' anchor.

Specificity

The description names the domain and several concrete targets ("reviewing large SPA bundles, new dependency additions, or routes that feel slow to hydrate") plus concrete relocation strategies ("route transitions, user interaction, or viewport-based loading"), matching the 'several specific actions; minor gaps' anchor. It falls short of 5 because the action verbs are thinner than a comprehensive list — 'reviewing' and 'can move behind' carry most of the weight.

Completeness

Both parts are present: an explicit "Use when reviewing..." trigger clause and a what-statement ("Focus on code that is not required for the initial view and can move behind..."). The 'when' is concrete, but the 'what' is framed as scope rather than explicit actions, so it fits 'both present; when could be more explicit or specific' inverted — the what keeps it from a 5.

Trigger Term Quality

Relevant keywords like "SPA bundles", "hydrate", and "dependency additions" are present, but the most natural phrases a user would say — "code splitting", "lazy loading", "bundle size" — are missing. This matches the 'some relevant keywords but missing common variations or synonyms' anchor rather than 4, since the gaps are the primary terms, not just a few extras.

Distinctiveness Conflict Risk

The niche (SPA bundle optimization via lazy loading) is clear and mostly distinct, but "new dependency additions" could also trigger dependency-audit or bundle-analysis skills, giving minor overlap risk — matching anchor 4 rather than 5's 'minimal conflict risk'.