Conciseness

The body is lean overall (~40 lines, tight step structure), but contains minor trimmable padding: "Think step by step. Save as markdown if substantial" is filler, and the key-principles block re-explains lean-startup concepts (skin-in-the-game, YODA) Claude already knows. This fits anchor 4 (efficient with minor over-explanation instances) better than anchor 3, since the excess is limited to a few phrases rather than a pervasive explanation section.

Actionability

Concrete guidance is present: the XYZ hypothesis formula with X/Y/Z definitions, a menu of five named experiment types each tied to what it tests, and a requirement to specify hypothesis/method/metric/success threshold per experiment. However, no worked example (e.g., a sample XYZ hypothesis or a filled-in experiment spec) is provided, so it stops short of anchor 5's 'specific examples cover the common cases' — matching anchor 4.

Workflow Clarity

Steps 1-4 form a clear, coherent sequence (hypothesis -> experiment selection -> principles -> per-experiment specification) for a non-destructive generative task, so the batch/destructive cap does not apply. It falls short of anchor 5 only because there are no explicit checkpoints (e.g., verifying each experiment includes all four required fields before output), matching anchor 4: clear sequence with minor validation gaps.

Progressive Disclosure

The body is under 50 lines with no need for external reference files (references/, scripts/, assets/ do not exist), and content is well-organized under clear headers (Context, Instructions, Further Reading) with clearly-labeled one-level-deep external links. Per the rubric's simple-skill guideline, this matches anchor 5: clear, well-signaled organization that is easy to navigate.

Specificity

"Creates XYZ hypotheses and suggests low-effort validation methods like landing pages, explainer videos, and pre-orders" lists several specific concrete actions with named example methods, but coverage is not fully comprehensive (concierge/MVP options from the body are absent). This sits between anchor 3 (1-2 actions, not comprehensive) and anchor 5 (comprehensive list), matching anchor 4: several specific actions with minor coverage gaps.

Completeness

The description explicitly answers "what" ("Design lean startup experiments (pretotypes)... Creates XYZ hypotheses and suggests low-effort validation methods") and "when" with a concrete "Use when..." clause listing three trigger scenarios. Both are clearly and explicitly stated with concrete trigger phrases, matching anchor 5 exactly; anchor 4 would require the 'when' to be less specific, which it is not.

Trigger Term Quality

"validating a new product idea, creating pretotypes, or testing market demand" plus "lean startup experiments" are natural phrases a user would say, with the distinctive term "pretotypes" covered. Common synonyms like "MVP", "product-market fit", or "experiment design" are missing, so it matches anchor 4 (good keyword coverage, a few natural terms missing) rather than anchor 5 (comprehensive synonyms).

Distinctiveness Conflict Risk

"pretotypes", "XYZ hypotheses", and "lean startup experiments" carve out a clear niche with distinct trigger terms unlikely to fire for unrelated skills. Unlike anchor 4 (minor overlap risk with closely related skills such as general document or code skills), the only plausible overlap would be a near-duplicate lean-validation skill, so anchor 5 is the best fit.