Conciseness

The body is dense and table-driven with no explanation of basic concepts Claude already knows, and time-sensitive details (QMSR transition date, FY2024 fees) are explicitly framed as historical with caveats to verify current figures. However, it inlines some content that belongs in the reference files — the legacy QSR→ISO 13485 mapping table and the full 7-step CAPA list duplicate what references/qsr_compliance_requirements.md and references/fda_capa_requirements.md are stated to contain — keeping it at anchor 4 ('minor instances that could be trimmed') rather than anchor 5.

Actionability

Concrete, executable guidance is present throughout: copy-paste-ready script commands ('python scripts/fda_submission_tracker.py /path/to/project --type 510k'), specific CFR citations (21 CFR 807.87 required-sections table, §164.308/310/312 safeguards), a decision tree, and timelines/fees. It falls short of anchor 5 because there are no worked deliverable examples (e.g., a sample substantial-equivalence comparison or Q-Sub question set) and steps like 'Respond to AI requests' lack specifics.

Workflow Clarity

The 4-phase 510(k) workflow has explicit checkpoints at each phase ('Checkpoint: SE argument feasible?', 'Checkpoint: Submission accepted?') and the design-controls workflow includes per-step verification questions, matching anchor 4's 'clear sequence with most checkpoints present'. It is not anchor 5 because checkpoints are questions without feedback loops — no 'if the checkpoint fails, do X' recovery guidance, and the RTA-issues table is not wired into the workflow as a recovery path.

Progressive Disclosure

Each section ends with a clearly signaled one-level-deep reference link ('See [fda_submission_guide.md](references/fda_submission_guide.md)...') plus a Resources section listing scripts and references with purposes — good structure matching anchor 4. It misses anchor 5 because references/fda_capa_requirements.md is listed in Resources but never linked from the CAPA section (whose content is inlined instead), and reference-level depth (the full legacy→ISO mapping table) is duplicated in the body. Note: no bundle files were present in the evaluation directory to verify the referenced paths exist.

Specificity

The description lists multiple concrete capability areas — '510(k)/PMA/De Novo pathway guidance, QMSR... compliance, HIPAA assessments, and device cybersecurity' — comprehensively covering every domain in the skill body, and uses third-person voice ('Provides'). It fits the anchor-5 example of multiple specific concrete actions with comprehensive coverage; anchor 4's 'minor gaps in coverage' does not apply since all four body domains are named.

Completeness

It explicitly answers both questions: what ('FDA regulatory consultant for medical device companies. Provides 510(k)/PMA/De Novo pathway guidance, QMSR... compliance, HIPAA assessments, and device cybersecurity') and when ('Use when user mentions FDA submission, 510(k)...'). This matches anchor 5's 'clearly and explicitly answers both what AND when with concrete trigger phrases'; the when-clause is explicit rather than the 'could be more explicit' condition of anchor 4.

Trigger Term Quality

The trigger list — 'FDA submission, 510(k), PMA, De Novo, QMSR, QSR, ISO 13485 for FDA, premarket, predicate device, substantial equivalence, HIPAA medical device, or FDA cybersecurity' — covers natural user phrasings plus synonyms for both current and legacy terminology (QMSR and QSR). This matches anchor 5's 'comprehensive coverage of natural terms including synonyms'; anchor 4 ('a few natural terms missing') would require absent variations, which is not the case.

Distinctiveness Conflict Risk

The FDA medical-device regulatory niche is clear and the triggers are domain-specific; even the potentially overlapping term is qualified as 'HIPAA medical device' to prevent conflict with a generic HIPAA skill. This matches anchor 5's 'clear niche with distinct triggers; minimal conflict risk'; anchor 4's 'minor overlap risk with closely related skills' is not a better fit given the scoping.