Conciseness

Mostly efficient — the tables carry dense domain data Claude cannot reliably recall — but it could be tightened: the disclaimer appears twice (a full 'Disclaimer' section plus a redundant italic footer note), the dated FAQ 1331 rule (updated August 31, 2026) is inlined in the SAQ section, and the SAQ quick-reference and v4.0-changes tables substantially duplicate content in the dedicated reference files. Matches anchor 3 ('mostly efficient but some unnecessary explanation or could be tightened'); not 4 because the duplication and double disclaimer exceed 'minor instances'.

Actionability

Concrete, executable guidance throughout: exact output-table columns per task type ('Req # | Control | Status | Gap | Evidence Needed | Priority'), a defined status vocabulary with emoji markers, a fixed response structure for control guidance (What it requires / How to implement / Evidence for QSA / Common gaps / v4.0 note), and a policy document control block. Falls at anchor 4 ('mostly executable guidance with minor gaps') rather than 5 because no worked example output (e.g., a sample gap-assessment row or filled policy block) is provided.

Workflow Clarity

Five workflows each have a clear numbered sequence, opening clarifying questions as checkpoints, and explicitly named deliverables ('In-scope system inventory, data flow description, segmentation assessment, scope reduction recommendations'); the SAQ workflow even handles the conditional FAQ 1331 ROC branch. Anchor 4 rather than 5 because there are no explicit validation/recheck steps (e.g., confirming merchant level or outsourced-status before recommending a SAQ type); anchor 3 does not fit since sequencing and checkpoints are largely present.

Progressive Disclosure

The body is a well-organized overview that splits detail across three one-level-deep reference files, each listed in the 'Reference Files' section with a purpose and an explicit 'When to load' map ('Gap assessment → load pci-dss-requirements.md', 'QSA/ROC preparation → load all three files'). Verified all three referenced files exist and contain no nested references. Matches anchor 5 (clear overview, well-signaled one-level-deep references, easy navigation).

Specificity

The description names the domain clearly ('Expert PCI DSS compliance advisor covering PCI DSS v4.0.1... and v4.0') but states only one generic action — 'covering' a long list of topics — without concrete capabilities like gap assessment, SAQ selection, or policy generation. It matches anchor 3 (domain plus limited concrete actions); not 4 because no list of specific actions is present, and not 2 because the topic coverage is highly specific rather than generic.

Completeness

Explicitly answers both parts: 'what' via 'Expert PCI DSS compliance advisor covering...' with enumerated scope areas, and 'when' via the explicit 'Use this skill whenever a user asks about...' clause plus 'Also trigger for questions like...' with concrete example questions. Matches anchor 5; anchor 4's caveat ('when' could be more explicit) does not apply since trigger guidance is fully explicit.

Trigger Term Quality

Comprehensive natural-term coverage including synonyms and domain shorthand: 'PCI DSS, payment card security, cardholder data protection, CDE scoping, SAQ types (A, A-EP, B, B-IP, C, C-VT, P2PE, D), ROC, AOC, QSA assessments, ASV scans', plus verbatim user questions like 'are we PCI compliant?' and 'which SAQ applies to us?'. Clearly anchor 5; adjacent anchor 4 ('a few natural terms missing') does not fit given nothing material is missing.

Distinctiveness Conflict Risk

Clear niche (PCI DSS compliance) with distinct domain-specific triggers (SAQ types, QSA, AOC, ASV, CDE) that no generic or neighboring skill would claim. Matches anchor 5 (clear niche with distinct triggers, minimal conflict risk).