The body is dense reference material (tables and code) rather than padded prose, but the attacker-controlled vs. server-controlled distinction is restated across multiple sections ("Do Not Flag", step 4, step 5) and could be tightened. It is not a 3 because of this repetition; not a 1 because it avoids explaining concepts Claude already knows.

It provides executable code snippets, explicit flag/safe pattern pairs, a copy-paste output format template, and concrete severity criteria — fully actionable guidance. It is not a 2 because the examples are real and complete rather than pseudocode.

The six-step Review Process is clearly sequenced with explicit validation checkpoints (confidence levels gating what to report, 'Research Before Flagging', 'Verify Exploitability'). It is not a 2 because feedback loops and gating checkpoints are explicit, not implicit.

Core references are one-level deep and well-signaled with a context-to-reference mapping table, but the body directs Claude to load `languages/*.md` and `infrastructure/*.md` paths that do not exist in the bundle — broken navigation. It is not a 3 because of these missing referenced files; not a 1 because the core references that do exist are clearly organized.

The description lists multiple concrete actions such as "review code for injection, XSS, authentication, authorization, cryptography issues" and "confidence-based reporting", matching the 'Lists multiple specific concrete actions' anchor.

It clearly answers both 'what' ("Security code review for vulnerabilities... systematic review with confidence-based reporting") and 'when' with an explicit 'Use when...' clause, matching the anchor for clearly answering both what AND when.

It provides natural phrases users would actually say — "security review", "find vulnerabilities", "check for security issues", "audit security", "OWASP review" — giving good coverage of common variations. It is not a 2 because the trigger set is broad and natural rather than sparse.

The security-vulnerability niche is clear and the triggers are distinct from general code-review skills, making it unlikely to fire for the wrong skill. It is not a 2 because the scope is sharply scoped to security/exploitability rather than overlapping generic review.