Conciseness

"Rewrite only the previous assistant message." followed by six terse constraint bullets is maximally lean — no padding, no concepts Claude already knows, and every token earns its place — an exact match for anchor 5 and clearly above anchor 4, which requires "minor instances of over-explanation" that are absent here.

Actionability

The instructions are concrete and executable ("Lead with the main point", "Remove jargon or explain any term that must stay", "Return only the rewrite"), matching anchor 4's "mostly executable guidance with minor gaps"; it falls short of anchor 5 because no worked input→output example covers the common case, and it is far above anchor 3 since nothing is pseudocode or vague.

Workflow Clarity

This is a simple single-purpose skill (10 lines, one task) where the single action — rewrite the previous message under explicit constraints — is unambiguous, so per the rubric's simple-skill guideline workflow clarity scores 5; it is not a destructive or batch operation, so the validation cap does not apply.

Progressive Disclosure

The skill is under 50 lines, needs no external references, and is well organized (title plus a short constraint list), which per the rubric's simple-skill guideline earns anchor 5; nothing is inlined that belongs in a separate file, so anchors 4 and below do not fit.

Specificity

"Re-explain the previous assistant message in short, plain English without adding information" names the domain and one concrete action with constraints, but does not list several specific actions — it matches anchor 3 ("Names domain and 1-2 concrete actions, but not comprehensive") rather than anchor 4's "several specific actions", and is clearly above anchor 2 because the action stated is fully concrete.

Completeness

It explicitly answers both questions: "what" is stated concretely ("Re-explain the previous assistant message in short, plain English without adding information") and "when" is stated with concrete trigger phrases ("Use when the user invokes '/wtf' or asks what the previous answer means") — an exact match for anchor 5, and clearly better than anchor 4's "when could be more explicit".

Trigger Term Quality

The triggers "invokes '/wtf'" and "asks what the previous answer means" are natural phrases a confused user would actually say, matching anchor 4 ("Good keyword coverage; a few natural terms missing") — below anchor 5 because synonyms like "put that in simpler terms" or "explain that again" are absent, and above anchor 3 because the terms present are natural rather than generic.

Distinctiveness Conflict Risk

The scope "previous assistant message" and the "/wtf" trigger define a clear niche, but the open-ended trigger "asks what the previous answer means" carries minor overlap risk with general explanation/simplification skills, matching anchor 4 ("Mostly distinct; minor overlap risk with closely related skills") rather than anchor 5's "minimal conflict risk".