Conciseness

The body is dense and table-driven, assuming Claude's competence (e.g. 'a manifest range resolves to whatever is newest today, a lockfile is what actually ships' as a one-line rationale, not a tutorial). Minor trimmable material remains — the opening SCA definition paragraph, an illustrative suppression date ('2026-12-31Z'), and inline version pins (CycloneDX 1.4-1.6, SPDX 2.3) — so it fits 'Efficient; minor instances… that could be trimmed' rather than the lean level-5 anchor.

Actionability

Guidance is fully executable and copy-paste ready: exact per-ecosystem commands ('osv-scanner scan -r ./', 'snyk test --all-projects --severity-threshold=high'), an exit-code-to-CI-action table, per-tool suppression file syntax, and a complete GitHub Actions job. This matches 'Fully executable; copy-paste ready code or commands' covering the common cases.

Workflow Clarity

Six clearly sequenced steps with an explicit validation checkpoint (Step 3's exit-code check that the scan actually saw packages) and a worked example demonstrating an error-recovery feedback loop (exit 128 → fix lockfile path → re-run → triage findings → ignore with expiry or upgrade). The anti-patterns table adds failure prevention, matching the level-5 anchor.

Progressive Disclosure

The body keeps only workflow-level guidance inline and delegates per-tool detail to seven reference files, all verified to exist, linked one level deep with clear signaling (a situation→reference table in Step 1 and an annotated References section). Reference files only cross-link to siblings, with no nested drilling, matching 'Clear overview with well-signaled one-level-deep references'.

Specificity

The description lists four concrete actions — 'Scans lockfiles with thresholds, checks packages were seen, outputs SARIF and allows only expiring ignores' — comprehensively covering the skill's workflow. It matches the anchor 'Lists multiple specific concrete actions; comprehensive coverage' rather than the level-4 anchor, which requires minor gaps in coverage.

Completeness

It explicitly answers both: 'Use when a repo needs dependency CVE scanning (SCA) in CI, a team is choosing between native audits…, or findings need triage' (when, with three concrete triggers) and 'Scans lockfiles with thresholds, checks packages were seen, outputs SARIF and allows only expiring ignores' (what). This matches the level-5 anchor exactly.

Trigger Term Quality

It names the exact tools users would say ('npm audit, pip-audit, cargo audit', 'OSV-Scanner and Snyk', 'CVE scanning (SCA)', 'triage'), giving good keyword coverage. It falls short of level 5 because common natural variations like 'vulnerability scan', 'dependency check', or lockfile names are absent.

Distinctiveness Conflict Risk

The dependency/lockfile CVE-scanning niche with named scanner tools is mostly distinct with minimal conflict risk. It sits at level 4 rather than 5 because 'findings need triage' as a trigger overlaps sibling triage skills (e.g. exploitability/reachability triage) referenced in the body.