Conciseness

Mostly efficient with short sections and a tight MUST DO / MUST NOT list, but it includes unnecessary padding: the '10+ years of experience' persona framing in 'You are a senior TypeScript developer with 10+ years of experience', a 'When to Use This Skill' section that restates the frontmatter description, and a 'Knowledge Reference' section that is a bare keyword list duplicating the description's trigger terms. This matches 'mostly efficient but includes some unnecessary explanation or could be tightened' rather than level 4, since at least two full sections could be deleted with no information loss.

Actionability

The Constraints section gives genuinely concrete rules ('Enable strict mode with all compiler flags', 'Use `satisfies` operator', 'Use enums' prohibition with the 'const objects with `as const`' alternative), and the workflow names specific techniques per step ('branded types, generics, utility types', 'project references, incremental compilation, tree shaking'). But for a code-output skill there is not a single executable code example or command — every pattern (branded types, discriminated unions, `satisfies`) is named but never shown. That is 'some concrete guidance but incomplete' (3), not level 4's 'concrete code or commands with minor gaps'.

Workflow Clarity

The five-step Core Workflow is a coherent sequence (analyze → design → implement → optimize → test) with a brief parenthetical per step, and step 5 ('Test types - Verify type coverage, test type logic, ensure zero runtime errors') functions as a validation checkpoint. However, no step has an explicit verification gate, error-recovery loop, or concrete check to run, matching 'steps listed but validation gaps; sequence present but checkpoints missing or implicit'. No destructive/batch operations are involved, so no cap applies.

Progressive Disclosure

SKILL.md is a clean overview that routes to five one-level-deep reference files via a table with topic, path, and an explicit 'Load When' condition (e.g. 'references/advanced-types.md' for 'Generics, conditional types, mapped types, template literals'), and all five referenced files exist in the bundle. This matches 'clear overview with well-signaled one-level-deep references; content appropriately split; easy navigation' — there is no nesting beyond one level and no bulk content inlined that belongs in references.

Specificity

The description names the domain ('building TypeScript applications requiring advanced type systems, generics, or full-stack type safety') and lists concrete capability areas ('type guards, utility types, tRPC integration, monorepo setup'), but these are topics rather than performed actions — the only verbs are 'Use when building' and 'Invoke for', so coverage of what the skill actually does is not comprehensive. It sits above 'actions are minimal or generic' (2) because the enumerated areas are specific, but below 'lists several specific actions' (4) because it never states actions the skill performs.

Completeness

It has an explicit 'when' ('Use when building TypeScript applications requiring...', 'Invoke for type guards, utility types, tRPC integration, monorepo setup') with concrete trigger phrases, and a what that is present but folded into the when-clause rather than stated as its own action (e.g. 'Writes and refactors advanced TypeScript...'). This matches 'has both what and when; when could be more explicit or specific' inverted — the when is strong but the what could be more explicit — which is the level-4 profile, not the level-5 'clearly and explicitly answers both'.

Trigger Term Quality

Strong natural keywords users would actually say: 'TypeScript', 'generics', 'type safety', 'type guards', 'utility types', 'tRPC', 'monorepo'. It misses a few common variations users might phrase naturally ('tsconfig', 'typing', 'types', '.ts'), placing it at 'good keyword coverage; a few natural terms missing' rather than comprehensive (5).

Distinctiveness Conflict Risk

The TypeScript-advanced-types niche is clear and triggers like 'tRPC integration', 'type guards', and 'generics' are unlikely to fire for the wrong skill. There is minor overlap risk with general TypeScript or full-stack skills ('full-stack type safety', 'monorepo setup'), matching 'mostly distinct; minor overlap risk with closely related skills' rather than the minimal-conflict level 5.