Conciseness

The core sections are tight bullet lists that assume Claude's statistical knowledge, but there are several padded pieces: 'Key Principles (Non-Negotiable)' restates earlier gates, 'Final Reminder' is motivational filler, and 'When to Use'/'Limitations' are boilerplate ('This skill is applicable to execute the workflow or actions described in the overview' adds nothing). That is more than 'minor instances' (4), so it sits at 'mostly efficient but could be tightened'.

Actionability

The Tracking Verification checklist is genuinely executable ('confirm it lands within 30 seconds', 'split within ±5% of the configured allocation'), but other sections give directives without the how: §7 says 'Estimate: Required sample size per variant' with no formula, and the Documentation section lists fields with no template — even though a sample-size guide and templates exist in references/ and are never linked. This lands at 'some concrete guidance but incomplete, missing key details' rather than 'mostly executable' (4).

Workflow Clarity

The body delivers a clearly numbered pipeline (§1–§8) with two explicit hard gates ('Do NOT proceed until confirmed', 'You may proceed... only if all are true'), a concrete pre-gate verification checklist, a refusal-conditions section, and explicit recovery loops ('If any item is missing, stop and resolve it'; 'If any of the above fails, stop and resolve it before Gate 8'). This matches the top anchor: clear sequence, explicit validation steps, feedback loops, and checklists.

Progressive Disclosure

The body is well-sectioned with headers, but the two bundle references (references/sample-size-guide.md, references/test-templates.md) are never mentioned anywhere in the body — they are neither signaled nor linked, so their content is undiscoverable from the skill. Per the guideline to score against the actual bundle structure, this fits 'references present but not clearly signaled', keeping it at 3 rather than 4.

Specificity

The description names the domain ('setting up A/B tests') and the gate objects ('hypothesis, metrics, and execution readiness'), which is roughly one-to-two concrete actions — comparable to 'Processes PDF files and extracts content'. It is not a bare domain mention (2), but it also does not list several specific actions like extracting, filling, or merging (4).

Completeness

The 'what' is clear ('Structured guide for setting up A/B tests with mandatory gates...'), but there is no 'Use when...' clause or equivalent trigger guidance — the rubric explicitly caps completeness at 3 in that case. It is above score 2 because the 'what' is concrete, but below 4 because the 'when' is entirely missing rather than merely imprecise.

Trigger Term Quality

'A/B tests', 'hypothesis', and 'metrics' are relevant natural keywords, but common variations users would say — 'split test', 'experiment', 'conversion rate', 'variant' — are absent. This matches 'Some relevant keywords but missing common variations or synonyms' rather than the near-complete coverage of a 4.

Distinctiveness Conflict Risk

'A/B tests' is a clear niche with specific gate language ('hypothesis, metrics, and execution readiness') giving distinct triggers. It is not a 5 because adjacent skills (general experimentation, analytics dashboarding, statistical analysis) could plausibly overlap, matching 'minor overlap risk with closely related skills'.