Conciseness

The body is dense and mostly assumes Claude's competence (no basic explanations of what memory leaks or delegates are); minor prose such as the "Tool Use Is Mandatory" preamble could be tightened.

Actionability

Provides copy-paste-ready Grep regexes, concrete verification procedures (count timers vs invalidate), specific fixes, a scoring rubric, and a complete output template that cover the common cases.

Workflow Clarity

Five phases are clearly sequenced with explicit validation checkpoints ("use Read to verify the surrounding context before reporting", "Require evidence from the Phase 1 map") and feedback loops that prevent speculative reporting.

Progressive Disclosure

Well-organized into clearly headed phases with one-level-deep cross-skill references ("Related" section), but the single 247-line file could split the pattern catalog or crash-correlation table into reference files.

Specificity

Names the domain ("memory leak prevention") and a couple of activities ("code review for memory issues", "proactive leak checking"), but these are high-level categories rather than concrete actions like detecting timer leaks or missing invalidate calls.

Completeness

The "when" is explicit ("Use when the user mentions..."), but the "what" is only implied through the trigger terms rather than stated as a capability; no explicit statement of what the skill does.

Trigger Term Quality

Natural phrases a user would say ("memory leak prevention", "code review for memory issues") are present with good coverage, though some synonyms (retain cycle, OOM, memory growth) are missing.

Distinctiveness Conflict Risk

The memory-leak niche is fairly distinct with clear triggers, though "code review for memory issues" could overlap with general code-review skills; the description does not name Swift, which would sharpen it.