Conciseness

The body is dominated by decision tables, thresholds, and gate rules that earn their tokens, with only minor trimmable asides (the Wikipedia definition of Simpson's paradox, a basic explanation of what a 95% CI gives, and inline citation quotes). This fits the 4 anchor (efficient, minor over-explanation) rather than 3, since the padding is incidental rather than structural, and rather than 5 because those asides exist.

Actionability

Concrete guidance throughout: pass criteria per check, an ordered guardrail procedure with STOP conditions, hard numeric rules ("Do not ship on a positive aggregate with a negative segment that represents > 20% of users"), and a fully worked example with real numbers. It falls at 4 rather than 5 because computation detail is delegated to references/significance-check.md and a few checks remain heuristic directives ("Audit the concurrent experiment list").

Workflow Clarity

"Each step has a hard stop: if a step blocks, do not proceed to the next" establishes an explicit six-step sequence where every step is a validation gate with STOP/no-ship conditions, plus extend-or-block recovery options and a worked example that walks all six steps. This matches the 5 anchor (explicit validation steps, feedback loops, checklists); 4 would require some checkpoints to be merely implicit, which they are not.

Progressive Disclosure

The body is an appropriate overview with all five referenced files (sources, significance-check, guardrails, thresholds-and-corrections, peeking) present in the bundle and exactly one level deep. It sits at 4 rather than 5 because two bundle files (significance-anti-patterns.md, significance-output-example.md) are only reachable via a sibling link inside significance-check.md — with mismatched link text — rather than being surfaced from SKILL.md, and thresholds-and-corrections.md is only mentioned parenthetically.

Specificity

"Computes significance per metric with multiple-comparison correction", "reads confidence intervals", and "checks novelty, interactions, Simpson's paradox, guardrails and stop-early rules" list multiple concrete actions that comprehensively cover the skill's six body steps. This matches the 5 anchor rather than 4 because coverage is comprehensive with no gaps, and the voice is consistently third person.

Completeness

An explicit "Use when an A/B test result is read for a ship decision, especially off a dashboard, a small sample or many metrics" clause answers 'when' with concrete triggers, and the multi-action verb chain answers 'what'. Both are clearly and explicitly stated, matching the 5 anchor exactly; 4 would require the 'when' to be less explicit than it is.

Trigger Term Quality

Natural phrases users would say are present ("A/B test result", "ship decision", "dashboard", "small sample", "confidence intervals", "guardrails"), but common synonyms such as "experiment results" or "should we ship" are missing. This fits the 4 anchor (good coverage, a few natural terms missing) rather than 5's comprehensive synonym coverage.

Distinctiveness Conflict Risk

The A/B-result-interpretation niche is distinct (and explicitly separated from the ab-test-validity-checklist companion), but phrases like "a small sample or many metrics" and generic statistical terms leave minor overlap risk with a general significance-testing skill. Fits 4 (mostly distinct, minor overlap with closely related skills) rather than 5's minimal conflict risk.