Conciseness

The opening paragraph re-explains what a parser-blocking <script> tag does and the Quick Reference re-teaches the defer/async/type=module semantics — concepts Claude already knows. The Check/Fix/Explain/Code Review sections themselves are tight, so this sits at 'mostly efficient but includes some unnecessary explanation or could be tightened' rather than 'noticeably verbose'.

Actionability

The Check and Fix sections give concrete, executable review instructions ("Flag any in the <head> without defer or async, and any at the bottom of <body> that could be in <head> with defer"; "Add defer or async to script tags in the document head, or convert to type=module"). Minor gaps keep it below fully copy-paste-ready: no before/after markup example of a violating vs. fixed script tag inline.

Workflow Clarity

A clear Check → Fix → Explain → Code Review sequence for a single-purpose review task; the check criteria are specific enough that no validation checkpoints are needed for this non-destructive workflow. It falls just short of 5 because the criterion "any at the bottom of <body> that could be in <head> with defer" leaves a judgment call undefined, and the Fix does not restate when to choose defer vs. async.

Progressive Disclosure

The body is a well-organized ~35-line overview with clear sections and a single, clearly signaled, one-level-deep pointer ("see `references/rule.md`" — verified to exist, 139 lines, not nested further). Content is appropriately split between the overview and the reference file.

Specificity

The description names the domain ("templates, rendered HTML, or shared components") and two concrete actions ("reviewing" and "Validate the final browser-facing markup"), but coverage is not comprehensive — it never states the actual validation criterion (script tags must use defer/async/type=module). This matches the anchor for naming a domain with 1-2 concrete actions; it falls below 'several specific actions' and above the generic-minimal anchor.

Completeness

Both halves are present: an explicit "Use when reviewing templates, rendered HTML, or shared components..." trigger and a what-clause "Validate the final browser-facing markup, not just the source framework abstraction". Not a 5 because the 'what' is indirect — the actual rule being validated is only obliquely referenced via the rule title, and the trigger clause could name the user-facing scenarios (code review of rendered HTML) more directly.

Trigger Term Quality

Good natural keyword coverage: "templates", "rendered HTML", "shared components", "defer, async, or type=module", "browser-facing markup". A few natural terms a user would say are missing (e.g. "script loading", "render-blocking scripts", "page load performance"), and the embedded title phrase "related to Load scripts with defer, async, or type=module" reads as boilerplate rather than natural phrasing — between the 'some relevant keywords' (3) and 'comprehensive with synonyms' (5) anchors.

Distinctiveness Conflict Risk

Clear niche — script loading attributes (defer/async/type=module) in rendered HTML review — with distinct trigger terms unlikely to collide with unrelated skills. This matches the 'clear niche with distinct triggers; minimal conflict risk' anchor; it is well above the 'mostly distinct, minor overlap' (4) anchor.