Conciseness

The body is dense and efficient: no concept tutorials, and comments carry rationale ('untested CDE/non-CDE network policy drifts into a segmentation breach') rather than padding. However, Step 7's PAN-storage-format rationale paragraph is repeated almost verbatim both within the step and again in references/strategies.md, which is trimmable duplication. Better than 3 (only one instance of over-explanation); not 5 due to that duplication.

Actionability

Concrete, near copy-paste test code with real regex patterns, specific assertions, and an upfront explicit declaration of harness-provided stubs (network_policy, inspect_tls, is_encrypted_aes_256, etc.), which justifies the non-standard helpers. Minor gaps: CardVault, client, user, and AuditLog are used without stubs or definition. Not 3 (the stub framing is explicitly justified and code is executable in-harness); not 5 (several app-under-test objects are undefined).

Workflow Clarity

Seven clearly sequenced steps (boundary → SAD storage → encryption at rest → transmission → access control → logging → scope reduction), each ending in a bold Checkpoint with explicit halt-and-remediate feedback loops ('File a severity-1 finding and trigger your incident response process', 'immediate secret rotation before continuing'). Matches the anchor-5 validate/fix/retry pattern; the operations are assert-based tests, so no destructive/batch cap applies.

Progressive Disclosure

The workflow stays in SKILL.md while catalog material is split into two real, one-level-deep references (references/strategies.md and references/pci-scope.md), each clearly signaled with an accurate description of its contents ('SAQ level selection (A / A-EP / D), PAN-storage rules, per-gateway hosted-fields patterns'), and both files exist and match their descriptions. Clear overview with well-signaled navigation, matching anchor 5.

Specificity

Enumerates several concrete coverage areas ('cardholder data environment boundaries, network segmentation, no stored CVV, track data or PIN, key management, encrypted transmission, scope reduction with hosted fields or tokens'), but the action the skill performs (authoring tests) is only implied via 'needs PCI DSS v4.0 tests or an SAQ level' rather than stated as a verb. This sits between anchor 3 (1-2 concrete actions) and anchor 5 (comprehensive, fully explicit), landing at 4.

Completeness

An explicit 'Use when a system handling payment card data needs...' trigger clause answers 'when' clearly, and the 'what' (PCI DSS v4.0 tests, SAQ level determination) is present but embedded in the when-clause rather than stated as an explicit capability ('Authors/writes...'). Better than 3 (the when is fully explicit, not weakly implied); short of 5 (the what is indirect).

Trigger Term Quality

Good natural keyword coverage ('payment card data', 'PCI DSS', 'SAQ level', 'CVV', 'track data', 'PIN', 'hosted fields', 'tokens'), but common user phrasings like 'PCI compliance', 'credit card', and 'payment processing' are missing. Not 3 (coverage is well beyond 'some relevant keywords'); not 5 (a few genuinely natural terms are absent).

Distinctiveness Conflict Risk

'PCI DSS v4.0', 'SAQ level', 'CVV', 'track data or PIN', and 'cardholder data environment' are domain-specific triggers forming a clear niche with minimal conflict risk against general compliance or test-authoring skills. Clearly matches the anchor-5 example's distinct-trigger pattern.