Conciseness

The body is dense and instruction-only — no explanations of concepts Claude already knows, and severity/FP rules are stated as terse clauses ('devDependency CVEs cap at MEDIUM'). It matches the 4 anchor ('efficient; minor instances of over-explanation that could be trimmed'): passages like the 'Framework-meta nudge' paragraph and the Phase 8 rationale ('Installed agent skills are executable prompt code, not documentation') could be tightened. Not 5 because a few narrative paragraphs pad beyond what the rules themselves require.

Actionability

Phase 2 provides copy-paste-ready git log/grep commands, and other phases name exact search patterns ('InsecureSkipVerify', 'dangerouslySetInnerHTML', 'pull_request_target', 'sk-ant-'), plus a concrete report template. It matches the 4 anchor ('mostly executable guidance with minor gaps'): only Phase 2 has literal commands, and Phases 3-8 give pattern checklists rather than executable audit commands. Not 5 because the common cases beyond secrets archaeology lack copy-paste command examples.

Workflow Clarity

Phases 0-13 are clearly sequenced, modes are tabulated with gate thresholds, and validation is the skill's spine: a confidence gate, a pre-emit verification gate ('If you cannot quote it, the finding is unverified'), a per-finding-type verification table, independent verifier subagents, and explicit skip reporting. This matches the 5 anchor — clear sequence with explicit validation steps and feedback loops for error recovery.

Progressive Disclosure

The single ~330-line file has clear section headers, but content that would benefit from being in separate reference files is fully inlined: the 22-item hard-exclusion list, the 12 precedents, the OWASP mapping table, and the data classification scheme. No references/ or scripts/ bundle files exist at all. This matches the 3 anchor ('some structure but could be better organized; content that should be separate is inline') — better than 2 because the structure is strong and nothing is buried, but short of 4 because substantial reference material is monolithically inlined.

Specificity

The description enumerates concrete capabilities — 'secrets archaeology, dependency supply chain, CI/CD pipeline, LLM/AI attack surface, agent skill supply chain, OWASP Top 10, STRIDE threat model, and data classification' — plus the 'confidence gate and a pre-emit verification gate'. This is comprehensive, multi-action coverage in third-person voice, matching the 5 anchor; it exceeds the 4 anchor ('several specific actions; minor gaps') because nothing significant in the skill's scope is missing.

Completeness

It explicitly answers both questions: what ('Run an infrastructure-first security audit of a repository' with the full capability list and the two suppression gates) and when (the 'Use when asked for...' clause with concrete trigger phrases), plus a negative boundary ('Not for reviewing a single diff'). This matches the 5 anchor exactly and goes beyond 4 ('when could be more explicit') since the triggers are enumerated.

Trigger Term Quality

'Use when asked for a security audit, threat model, pentest-style review, OWASP pass, or a pre-release security check' gives good natural-phrase coverage, matching the 4 anchor ('good keyword coverage; a few natural terms missing'). It falls short of 5 because common variants users would actually say — 'penetration test' (spelled out), 'vulnerability scan', 'security review' — are absent.

Distinctiveness Conflict Risk

'Infrastructure-first security audit' with named methodologies (STRIDE, OWASP) is a clear niche with distinct triggers, and the exclusion clause 'Not for reviewing a single diff - use requesting-code-review for that' actively disambiguates from the closest competing skill. Minimal conflict risk, matching the 5 anchor.