Conciseness

The body is lean and consists almost entirely of library-specific knowledge Claude cannot infer (prop defaults, streaming-vs-history configurations, html-policy defaults) with no padding of known concepts. It sits at anchor 4 rather than 5 because a few justificatory asides ('Content is already complete — pacing would slow it down, but fade gives a polished entry animation') could be trimmed, and it exceeds anchor 3 since none of the content is generic explanation.

Actionability

The prop configurations are concrete and copy-pasteable (':smooth-streaming="isStreaming ? \'auto\' : false"', '`markstream-vue2/workers/... ?worker`'), but there are no executable code blocks or commands anywhere: step 2 gives no install command, step 3 states 'Import `markstream-vue2/index.css` after resets' without a snippet, and step 6 says only 'Validate with the smallest useful Vite dev or build command'. This lands between anchors 3 and 4 — several key executable details are missing, but it is more concrete than the minimal high-level hints of anchor 2.

Workflow Clarity

A clear six-step sequence with checkpoints present: step 1 confirms the Vue 2 + Vite premise, a sub-step says 'verify its animation behavior before enabling both', and step 6 validates the build. It matches anchor 4 rather than 5 because the validation checkpoint is soft — 'smallest useful Vite dev or build command' is not a concrete command and there is no fix-and-retry feedback loop — though the non-destructive nature of the task means the destructive/batch cap does not apply.

Progressive Disclosure

The body is under 50 lines with well-organized sections (Workflow, Default Decisions, Useful Doc Targets) and appropriately keeps detail at overview level, which would otherwise merit a 5 under the simple-skill guidance. It drops to anchor 4 because the 'Useful Doc Targets' paths ('docs/guide/vue2-quick-start.md' etc.) do not exist as bundle files in the skill directory and their base location is never stated, leaving navigation ambiguous — a minor organization gap.

Specificity

The description names the domain ('Integrate markstream-vue2 into a Vue 2 plus Vite app') and several concrete specifics: 'Vite-friendly worker imports, `?worker` or `?worker&inline` setup for Mermaid or KaTeX, modern CSS ordering, or Vue 2 compatibility'. It falls at anchor 4 rather than 5 because it omits the library's core markdown-streaming/rendering capability entirely, a noticeable coverage gap; it is well above anchor 3 since it lists several specific, non-generic items.

Completeness

It explicitly answers both parts: the 'what' is 'Integrate markstream-vue2 into a Vue 2 plus Vite app' and the 'when' is an explicit 'Use when Codex needs Vite-friendly worker imports, `?worker` or `?worker&inline` setup for Mermaid or KaTeX, modern CSS ordering, or Vue 2 compatibility in a Vite-based repository' with concrete trigger phrases. This matches anchor 5; it is above anchor 4 because the 'when' clause is explicit and enumerates specific triggers rather than being weakly implied.

Trigger Term Quality

Natural terms users would say are present: 'Vue 2 plus Vite app', 'worker imports', 'Mermaid or KaTeX', 'CSS ordering', 'Vite-based repository'. Good coverage but a few natural variations are missing (e.g., markdown chat/streaming UI phrases, 'Vue2', '.vue'), so it matches anchor 4 rather than the comprehensive synonym coverage of anchor 5, while clearly exceeding the sparse keyword coverage of anchor 3.

Distinctiveness Conflict Risk

The trigger conditions are tightly scoped (markstream-vue2 + Vue 2 + Vite + specific worker-import patterns), giving a clear niche. However, the body references a separate generic 'markstream-vue2' skill covering the same library, and the description does not itself draw that boundary, so there is minor overlap risk with that closely related skill — matching anchor 4 rather than the minimal-conflict profile of anchor 5.