Conciseness

Mostly efficient and substantive, but the "Skill Contract" (Reads/Writes/Done when/Primary next skill) overlaps heavily with the 8-step "Instructions" and the closing "Next Best Skill" restates the contract's primary-next-skill line, so content could be tightened by ~150 tokens. Not a 1: it does not pad with explanations of basic concepts Claude already knows; statistical methods are named, not over-explained. Not a 3: the contract/instructions redundancy is genuine avoidable repetition.

Actionability

Gives a copy-paste-ready keyless command (`python3 "${CLAUDE_PLUGIN_ROOT}/scripts/connectors/experiment.py" proportion --control ...` with `continuous`/`samplesize` subcommands), a fill-in hypothesis template ("Because [observation], we believe [one change] will [raise primary metric] by [X%]..."), named statistical methods with conditions, and a concrete provenance-labeling scheme. Not a 2: guidance is specific and executable, with a documented manual-formula fallback in the reference, not pseudocode.

Workflow Clarity

Eight numbered steps run Pick mode → Hypothesis → Variant matrix → Metrics → Sizing/power → Significance read → Decision ownership → Provenance, with explicit checkpoints: NEEDS_INPUT stop in step 1, the UNDECIDED decision-owner gate in step 7, the "do not retrofit thresholds" multiplicity gate in step 6, and the enumerated "Done when" completion criteria. Not a 2: checkpoints are explicit, not implicit; this is a decision-gated workflow rather than a batch/destructive op needing fix-retry loops.

Progressive Disclosure

The body is a well-sectioned overview and the one bundled detail file (references/test-design-guide.md, which exists) is correctly used for the matrix template, sizing table, and formulas — good one-level-deep split. However, 5 of the 6 referenced paths (skill-contract.md, CONNECTORS.md, SECURITY.md, measurement-protocol.md, roas-benchmark.md) sit outside the skill bundle and are not present, so navigation dead-ends for a reader of the bundle. Not a 1: it is not monolithic, references are clearly signaled and only one level deep, not nested 2+ levels. Not a 3: the dangling parent-repo references break the 'easy navigation' anchor when scored against the actual bundle structure.

Specificity

Lists multiple concrete actions — "produces a hypothesis, variant matrix, sample-size/duration/power plan, and a documented effect/uncertainty read" — and the constraint "applies only a precommitted owner-approved action rule", matching the 'lists multiple specific concrete actions' anchor. Not a 2: it goes well beyond naming a domain to enumerating specific deliverables, and it uses third person ("produces", "It applies") with no first/second-person voice to penalize.

Completeness

Explicitly answers both what ("produces a hypothesis, variant matrix, sample-size/duration/power plan, and a documented effect/uncertainty read") and when ("Use when the user asks to..."), with explicit "Not for..." exclusions. Not a 2: the 'when' is an explicit trigger clause, not merely implied.

Trigger Term Quality

Quotes natural user utterances as triggers — "design an A/B test", "set up a creative/landing test", "run an incrementality test", "is this result statistically and practically material?" — plus Chinese equivalents, giving good coverage of phrasings a user would actually say. Not a 2: multiple natural variations are present rather than a single keyword.

Distinctiveness Conflict Risk

Explicitly disambiguates with "Not for producing variants — use ad-creative-builder; not for reading back one shipped change — use paid-measurement-loop", carving a clear niche with distinct triggers. Not a 2: it names the adjacent skills it could be confused with and redirects them.