Conciseness

The body is dense with skill-specific facts Claude cannot be relied on to know (2025 control counts, clause-to-document mappings, exact ISO terminology), with essentially no explanation of broadly known concepts. Minor trimming is possible: the October 2028 transition deadline is stated in roughly five places (Standard Overview, 2019 section, differences table, Key Statements, Transition Status) and the GDPR-no-safe-harbor point is repeated across sections, which is over-explanation that could be consolidated.

Actionability

For an instruction-only skill the guidance is fully executable: exact output table columns ('Control ID | Control Name | Applicable? | If Not: Justification | Implementation Status | Evidence Reference'), enumerated status values, required policy document sections, a fixed control-guidance response template (Purpose / What to implement / Evidence for audit / Common pitfalls / Regulatory link), role-based control counts, and a terminology table with the exact phrases auditors expect. This is the instruction-skill equivalent of copy-paste-ready code.

Workflow Clarity

Multi-step processes are clearly sequenced: the gap analysis workflow opens with a clarify-first checkpoint (version, role, sector, existing frameworks) before producing output, and the version-selection logic is explicit with three conditional branches. It falls short of anchor 5 because there are no explicit output validation steps (e.g., cross-check that the SoA reflects risk treatment, or that control counts match the role-based totals); this is advisory rather than destructive/batch work, so the validation cap does not apply.

Progressive Disclosure

The body is a genuine overview with detail correctly pushed to three real, one-level-deep reference files (verified present in references/ with no nested references inside them): the 78-control listing, transition guide, and regulatory mapping all live outside SKILL.md. A dedicated 'Reference Files' section describes each file and a 'When to load reference files' section maps task types to files, and inline pointers ('Consult references/annex-a-controls.md for the full control listing') are clearly signaled.

Specificity

The domain is named thoroughly ('Expert ISO 27701 Privacy Information Management System (PIMS) compliance advisor') but the capability is a generic role descriptor; 'covers the full ISO 27701 lifecycle from gap assessment through certification' gestures at actions without listing them (e.g., no explicit gap analysis, SoA generation, or policy drafting as stated actions). This matches anchor 3 (domain plus 1-2 weakly concrete actions) rather than 4, which requires a list of several specific actions.

Completeness

Both 'what' ('Expert ISO 27701 ... compliance advisor ... covers the full ISO 27701 lifecycle from gap assessment through certification') and 'when' ('Use this skill whenever a user asks about ...') are present, and the 'when' is exemplary with concrete trigger phrases. It falls between anchors 4 and 5: the 'what' is a single generic role phrase rather than the enumerated concrete actions the anchor-5 example shows, so it is not clearly a 5.

Trigger Term Quality

Comprehensive natural-term coverage including synonyms and both edition years: 'ISO/IEC 27701:2025, ISO/IEC 27701:2019, privacy information management, PIMS certification, PII controller or processor obligations, privacy risk assessment, Statement of Applicability ... privacy by design, data subject rights, DPIA, records of processing activities'. These are the exact phrases a user with this need would say, matching the anchor-5 example's breadth.

Distinctiveness Conflict Risk

The ISO 27701 niche is clear and triggers are distinct (edition years, annex IDs, PIMS terminology), but 'or any privacy management system topic' and 'When in doubt, use this skill — it covers the full ISO 27701 lifecycle' broaden the trigger surface into overlap with generic GDPR/privacy-compliance skills. This is anchor 4 (mostly distinct, minor overlap risk with closely related skills) rather than 5 (minimal conflict risk).