Conciseness

The checklist is dense and non-obvious API facts (defaults like 'smoothStreaming="auto"', activation conditions, typewriter/fade defaults) earn their tokens. A few rationale asides ('Content is already complete — pacing would slow it down, but fade gives a polished entry animation') could be trimmed, placing it at efficient-with-minor-trimmables (4) rather than the every-token-earns-its-place level (5).

Actionability

Concrete, exact guidance throughout: '<MarkdownRender {content} />', the streaming/history prop triples ('smoothStreaming="auto", fade={false}, typewriter={true}'), the dynamic-switch expression 'smoothStreaming={isStreaming ? \'auto\' : false}', and verification commands ('svelte-check, build, or e2e'). It falls short of 5 because there is no complete executable snippet — no import statement or runnable code block — only prop-level fragments.

Workflow Clarity

A clear implicit sequence runs from environment check ('Confirm Svelte 5; ask Svelte 4 users to upgrade') through install, CSS, default usage, advanced options, to verification ('Verify with svelte-check, build, or e2e'). Not a 5 because the ordering is implicit (unnumbered checklist), the verify step gives no failure-handling feedback loop, and the destructiveness cap does not apply since this is not a destructive or batch operation.

Progressive Disclosure

At ~26 lines the skill needs no external files, and it is organized into clean topic sections, which would merit 5 under the simple-skill exception. It drops to 4 because 'Useful Doc Targets' points at 'docs/guide/svelte.md' and 'docs/frameworks/svelte.md', which are not present in the skill bundle — references that cannot be resolved from the skill itself, a minor navigation gap.

Specificity

The only stated action is 'Integrate the beta markstream-svelte package in Svelte 5 or SvelteKit apps'; the rest lists capability areas ('smooth streaming, worker setup, renderer-local or scoped custom components, or SSR-safe boundaries') rather than concrete actions the skill performs. It names the domain plus 1-2 actions with minor gaps, matching the score-3 anchor rather than 4, which requires several specific actions.

Completeness

It explicitly answers both: what ('Integrate the beta markstream-svelte package in Svelte 5 or SvelteKit apps') and when ('Use when Codex needs Svelte 5 runes, CSS and optional peers, smooth streaming, worker setup...'), with a concrete boundary statement ('Svelte 4 is unsupported'). This matches the score-5 anchor; the 'when' clause is explicit, not merely implied as at 4.

Trigger Term Quality

Natural terms users would say are present: 'Svelte 5', 'SvelteKit', 'streaming', 'worker setup', 'custom components', 'SSR'. A few common terms are missing — notably 'markdown' itself and phrases like 'render markdown' — so it falls between the good-coverage (4) and comprehensive-synonym (5) anchors.

Distinctiveness Conflict Risk

The trigger set (markstream-svelte, Svelte 5 runes, SvelteKit workers, smooth streaming) occupies a clear niche with minimal overlap with generic skills. It clearly matches the clear-niche, minimal-conflict anchor; moving to 4 would require demonstrable overlap with a closely related skill, which is not the case.