Conciseness

The matrix rules, formulas, and presentation instructions are lean, but the Domain Context section spells out ICE/RICE mechanics ("ICE works well for assumption prioritization: Impact (Opportunity Score × # Customers) × Confidence (1–10) × Ease (1–10)...") that largely restate prioritization knowledge Claude already has, and "Think step by step" is a no-op instruction. This is anchor 4 (minor trimmable over-explanation), not 5 — trimming the Domain Context primer and the filler sentence would bring every remaining token into clear earn-its-place territory.

Actionability

Concrete, executable decision rules throughout: "Risk: Defined as (1 - Confidence) × Effort", four fully specified quadrant actions ("High Impact, High Risk → Design an experiment to test it"), and explicit experiment criteria ("Measures actual behavior, not opinions", "Has a clear success metric and threshold"). It is not a 5: there is no worked example or sample experiment type (e.g. a smoke test or interview script) showing the framework applied to one assumption end-to-end, leaving a minor gap between the rules and a finished output.

Workflow Clarity

A clear four-step sequence (evaluate dimensions per assumption → categorize via the matrix → suggest experiments → "Present results as a prioritized matrix or table") with a defined output format. The destructive/batch feedback-loop cap does not apply since the operation is purely analytical. It is not a 5: there are no checkpoints for edge cases — e.g. what to do when the assumption list is empty, ambiguous, or lacks data for the Impact/Risk inputs — and no verification that the table covers every assumption supplied.

Progressive Disclosure

The body is under 50 lines with no bundle files, and per the rubric's simple-skill guidance that permits a 5 with well-organized sections. Sections (Context, Domain Context, Instructions, Further Reading) are cleanly organized; external links are quarantined in "Further Reading", and the one cross-reference ("See the prioritization-frameworks skill") stays a single level deep rather than nesting.

Specificity

The description names two concrete actions with an explicit method — "Prioritize assumptions using an Impact × Risk matrix and suggest experiments for each" — which is more specific than the anchor-3 example ('Processes PDF files and extracts content') because the framework itself is named. It is not a 5: coverage stops at two actions, short of the 'multiple specific concrete actions; comprehensive coverage' anchor.

Completeness

What is answered explicitly ("Prioritize assumptions using an Impact × Risk matrix and suggest experiments for each") and when is answered with concrete trigger phrases ("Use when triaging a list of assumptions, deciding what to test first, or applying the assumption prioritization canvas") — this mirrors the anchor-5 good example pattern. Not a 4: the 'when' clause is not merely present, it lists three distinct explicit triggers.

Trigger Term Quality

Natural phrases a user would actually say are present: "triaging a list of assumptions", "deciding what to test first", and "applying the assumption prioritization canvas". It is above anchor 3 ('some relevant keywords but missing common variations') because the coverage is good and domain-natural, but below anchor 5 since it omits synonyms users might use, e.g. 'validate assumptions', 'hypotheses', or 'riskiest assumptions first'.

Distinctiveness Conflict Risk

It carves a clear niche (assumption triage before building) with distinct triggers like "applying the assumption prioritization canvas", so it is well above anchor 3 ('could still overlap with similar skills'). It is not a 5: the generic verbs 'prioritize'/'deciding what to test first' leave minor overlap risk with general prioritization or testing-plan skills — the body itself references a sibling 'prioritization-frameworks' skill, confirming adjacent territory.