Conciseness

The ~45-line body is lean and directive throughout: "This skill owns TypeScript policy within the kit", "Do not reimplement deterministic TypeScript, ESLint, or formatting checks", with no padding and no explanation of concepts Claude already knows — every token earns its place, matching anchor 5.

Actionability

The guidance is concrete and executable for an instruction-only hub skill (inspect repository configuration, precedence rules, named verification loops: "focused type checks, lint, formatting, and behavioral tests as relevant"), and the absence of code is not penalized per the rubric's scoring note; the minor gap versus anchor 5 is that no example commands or snippets appear in the body itself — the concrete examples all live one level deeper in the references.

Workflow Clarity

Four clearly sequenced steps (Establish policy → Load rules → Apply → Verify) with an explicit verification checkpoint, escalation guidance ("Expand by impact and run repository-mandated gates at their defined stages"), and completion criteria ("Finish when each relevant rule is satisfied or a justified exception is identified") — anchor 4 rather than 5 because no explicit error-recovery/fix-retry loop is described, though this policy skill involves no destructive or batch operations, so the workflow cap does not apply.

Progressive Disclosure

The body is a model one-level-deep index: every one of the 10 local reference files exists and is clearly signaled with "read for…" scope statements plus ownership boundaries (e.g., "Types owns narrowing and assertion policy"), organized under Conventions and Worked comparisons, with the section-level contents claim verified in the actual files; the three cross-kit comparison links (../typescript-contracts/, ../node/) are explicitly labeled as belonging to sibling skills, so navigation remains clear — anchor 5.

Specificity

The description enumerates a comprehensive set of concrete activities and topics ("writing, reviewing, or explaining types, discriminated unions, function APIs, variables and state, naming, source organization, React components and hooks, data flow, or tests") but the governing action is a single "apply conventions" and the trailing "Canonical typescript conventions" fragment is redundant — fitting anchor 4 (several specific actions, minor gaps) rather than anchor 5's multiple distinct action verbs.

Completeness

Both what ("Apply TypeScript conventions…") and when ("when writing, reviewing, or explaining…") are present, plus an explicit negative boundary ("Do not use for styling or layout alone"), but there is no user-request-level trigger phrase like "Use when the user mentions TypeScript" — anchor 4 (both present, 'when' could be more explicit) rather than anchor 5's concrete trigger phrases.

Trigger Term Quality

Good keyword coverage of natural terms users would say ("TypeScript", "types", "function APIs", "React components and hooks", "naming", "tests"), but common synonyms and file extensions (.ts, .tsx, "TS") are missing, matching anchor 4 ("Good keyword coverage; a few natural terms missing") rather than anchor 5's comprehensive synonym/extension coverage.

Distinctiveness Conflict Risk

The explicit exclusion clause ("Do not use for styling or layout alone") distinguishes it from styling/layout skills, and the enumerated sub-domains carve a clear niche, but there is minor overlap risk with closely related TypeScript skills (e.g., contract or linting convention skills) — anchor 4 ("Mostly distinct; minor overlap risk with closely related skills") rather than anchor 5's minimal conflict risk.