Conciseness

The body is lean and directive throughout — it explains no concepts Claude already knows and every bullet adds package-specific guidance (AGENTS.md conventions, protobuf regeneration, mise/pnpm commands), fitting 'every token earns its place' rather than the anchor 4 case of trimmable over-explanation.

Actionability

The formatting section gives fully executable, copy-paste commands ("mise x -- pnpm format -- path/to/file.ts path/to/other-file.mjs" plus the :check variant) and the coding rules are specific ("Narrow unknown before use", "Avoid any"), but "Run the relevant type, lint, and test checks" stops short of naming the commands the way the format section does — minor gaps matching anchor 4.

Workflow Clarity

A clear sequence is present (read AGENTS.md conventions → write code to the stated practices → run Prettier with explicit format and format:check commands → run type/lint/test checks → report what ran), with most checkpoints present; it stays at anchor 4 rather than 5 because there is no error-recovery loop if format:check or the type/lint/test checks fail, and those check commands are unspecified. The cap at 3 does not apply since this is authoring, not a destructive or batch operation.

Progressive Disclosure

The skill is under 50 lines, needs no external references (no bundle files exist), and is organized into two clearly headed sections ("Write code that explains its behavior", "Format every source edit") with pointers to repo-local sources (AGENTS.md, the repository's Svelte skills) rather than inlined bulk content — per the rubric's simple-skill guideline this qualifies for 5.

Specificity

The description names the domain ("JavaScript and TypeScript source, including scripts, tests, and Svelte modules") with two concrete actions ("Write or revise" and "Apply its documentation and Prettier practices"), but the practices half is underspecified and coverage is not comprehensive, matching the 'domain plus 1-2 concrete actions' anchor rather than 'several specific actions'.

Completeness

The 'what' is clear ("Write or revise JavaScript and TypeScript source... Apply its documentation and Prettier practices") but there is no 'Use when...' clause or equivalent explicit trigger guidance, which the guidelines say caps completeness at 3; the 'when' is not even weakly implied, so it cannot reach anchor 4.

Trigger Term Quality

Good natural keyword coverage — "JavaScript", "TypeScript", "scripts", "tests", "Svelte", "Prettier" are terms users would actually say — but common variations like file extensions (.ts, .tsx, .js) and terms like "format" or "frontend" are missing, matching 'good keyword coverage; a few natural terms missing' rather than the comprehensive anchor.

Distinctiveness Conflict Risk

The JS/TS authoring niche with Prettier and Svelte specifics is mostly distinct with only minor overlap risk against generic coding or Svelte-focused skills, but "Write or revise JavaScript and TypeScript source" is broad enough to fire on nearly any JS task, keeping it below the 'clear niche with minimal conflict risk' anchor.