Conciseness

The 15 audit phases themselves are dense with non-obvious operational knowledge (FP rules, severity calibration, 22 hard exclusions, precedents) rather than concepts Claude already knows, but roughly 150 lines of gstack framework boilerplate (preamble session/telemetry plumbing, Voice persona, onboarding prompts, effort tables, contributor mode) pad the file without advancing the security task. This lands on the 3 anchor — mostly efficient with unnecessary sections that could be trimmed — rather than 2, because the core audit content explains nothing Claude already knows.

Actionability

Mostly executable: copy-paste git-log/grep/find commands per phase, verbatim sub-agent verifier prompts, exact severity mappings, output templates, and a complete JSON report schema. It is not a 5 because phases 9–11 pose prose questions ("Rate limits on authentication endpoints?", "Is sensitive data encrypted at rest and in transit?") without concrete search patterns or commands, and Phase 1 counting instructions rely on adaptation rather than ready commands.

Workflow Clarity

The 15 phases are explicitly sequenced 0–14 with a mode-resolution ruleset (mutually exclusive scope flags error out, always-run phases named, diff-mode behavior specified), and Phase 12 is a dedicated validation gate with feedback loops: confidence-gate filtering, active verification, variant analysis, parallel independent re-verification with explicit discard thresholds, and escalation after 3 failed attempts. This matches the 5 anchor — clear sequence, explicit validation, error-recovery loops.

Progressive Disclosure

Scored against the actual bundle: there are no references/, scripts/, or assets/ files, so everything — OWASP per-category details, the 22-item hard-exclusion list, the report JSON schema, the incident-response playbook — is inlined in one ~900-line SKILL.md. Internal structure is genuinely good (well-labeled phase sections make it navigable, above the 2 anchor's 'minimal structure'), but content that clearly belongs in one-level-deep reference files is fully inlined, matching the 3 anchor's 'content that should be separate is inline'.

Specificity

The description lists multiple specific concrete actions — "secrets archaeology, dependency supply chain, CI/CD pipeline security, LLM/AI security, skill supply chain scanning, plus OWASP Top 10, STRIDE threat modeling, and active verification" — plus "Trend tracking across audit runs", giving comprehensive coverage in third-person voice. It clearly exceeds the 4 anchor ('several specific actions; minor gaps') since every named capability is a distinct, concrete audit activity.

Completeness

It explicitly answers both what ("Infrastructure-first security audit" with a full capability list and two modes with their confidence gates) and when ("Use when: 'security audit', 'threat model', 'pentest review', 'OWASP', 'CSO review'") with concrete trigger phrases. This matches the 5 anchor exactly; a missing or implicit 'when' clause would cap it at 3, but the trigger list is explicit.

Trigger Term Quality

Triggers are natural phrases users would say — "security audit", "threat model", "pentest review", "OWASP", "CSO review" — matching the 4 anchor of good coverage with a few natural terms missing (e.g., "vulnerability scan", "security review", "penetration test", "supply chain audit"). Not a 5 because common synonyms and variations are absent.

Distinctiveness Conflict Risk

"CSO review" and "OWASP" are distinctive triggers for a clear niche, but "security audit" and "threat model" are broad terms that could also fire for generic security-review or code-review skills — minor overlap risk with closely related skills, matching the 4 anchor. Not 5 because the overlap with any other security-oriented skill is real, not minimal.