Conciseness

The body is lean with a tight Quick Reference and short Check/Fix/Explain/Code Review sections; the only trimming candidate is the opening paragraph explaining what bfcache is ("turns many browser back and forward navigations into near-instant restores"), which Claude already knows, placing it at efficient-with-minor-over-explanation rather than fully lean at 5.

Actionability

It names concrete APIs and directives ("Never add an unload listener", "Use pagehide and pageshow", "Refresh time-sensitive state when pageshow.persisted is true") and defers executable code to the reference file, which is appropriate for an instruction-only skill; minor gaps keep it at 4 rather than copy-paste-ready at 5.

Workflow Clarity

Check → Fix → Explain → Code Review gives a recognizable sequence, but there are no explicit validation or verification checkpoints (e.g., confirming eligibility in DevTools as a verification step in the workflow), matching the 3 anchor of steps-present-but-checkpoints-implicit.

Progressive Disclosure

The SKILL.md body is a concise overview with well-organized sections and a single clearly signaled one-level-deep reference ("see references/rule.md", which exists as a 113-line file holding the code examples and framework guidance), matching clear-overview-with-one-level-deep-references at 5.

Specificity

Names the domain ("navigation performance, browser lifecycle events, or resume-from-memory behavior") and one concrete action ("Check the actual browser lifecycle and restore path"), but does not enumerate multiple specific actions, fitting the domain-plus-1-2-actions anchor rather than the comprehensive list at 5.

Completeness

It explicitly provides both a "when" ("Use when reviewing navigation performance, browser lifecycle events, or resume-from-memory behavior") and a "what" ("Check the actual browser lifecycle and restore path, not only static code patterns"), but the "what" could be more specific, matching the 4 rather than the fully concrete 5.

Trigger Term Quality

"navigation performance", "browser lifecycle events", and "resume-from-memory behavior" are natural phrases a user might say, though the common synonym "bfcache"/"back/forward cache" is absent, leaving a few natural terms missing per the 4 anchor.

Distinctiveness Conflict Risk

The bfcache-focused triggers carve a fairly distinct niche with minimal overlap risk against general performance skills, though "navigation performance" could brush against broader performance-review skills, fitting mostly-distinct at 4 rather than clear-niche at 5.