Conciseness

Mostly efficient — each pattern is a tight ✅/❌ code pair with a one-line rationale — but it includes content Claude already knows, such as the ten-entry utility-types reference (Pick, Omit, Partial, Record, ReturnType, etc.) and a trailing 'Keywords' section that adds no instruction. That matches 'mostly efficient but includes some unnecessary explanation or could be tightened'.

Actionability

Concrete, mostly executable TypeScript snippets with explicit ALWAYS/NEVER contrast and a working type guard, e.g. `const STATUS = {...} as const; type Status = (typeof STATUS)[keyof typeof STATUS];`. It falls short of 5 because a few examples are incomplete skeletons — `function parse(input: any): any { }` has an empty body, and `isUser` is used before its section defines it.

Workflow Clarity

This is a single-purpose pattern-reference skill, not a multi-step process, so per the simple-skill note a 5 is available if everything is unambiguous; it nearly qualifies with clearly titled sections and REQUIRED markers. It sits at 4 because rules are inconsistently enforced (only two sections are marked REQUIRED) and 'Never Use any' duplicates a rule without a section-level marker, leaving minor ambiguity about which patterns are mandates vs. suggestions.

Progressive Disclosure

No bundle files exist, and the ~110-line body is cleanly sectioned per pattern with no nested references, so there is nothing impossible to navigate. It misses 5 because the skill exceeds the under-50-lines simple case: the utility-types lookup list and keyword list are reference material inlined in SKILL.md that would be better placed in a references/ file.

Specificity

The description names the domain ("TypeScript strict patterns and best practices") but names no concrete actions or capabilities — it never says what the skill actually does, matching the anchor 'Names the domain but actions are minimal or generic'. It is above 1 because the domain is explicit, and below 3 because 'types, interfaces, generics' are topics, not the 1-2 concrete actions that anchor requires.

Completeness

Both parts are present: a 'what' ("TypeScript strict patterns and best practices") and an explicit 'when' ("Trigger: When writing TypeScript code - types, interfaces, generics"), so it clears the anchor-3 cap for missing trigger guidance. It is not 5 because the 'what' is generic — it doesn't state concrete capabilities — which is exactly the 'when could be more explicit or specific'-style weakness the anchor-4 band describes.

Trigger Term Quality

"When writing TypeScript code - types, interfaces, generics" provides good natural keyword coverage with multi-word phrases a user would actually say. It falls short of 5 because common variations and synonyms are missing ('TS', '.ts/.tsx files', 'type definitions').

Distinctiveness Conflict Risk

"TypeScript strict patterns" with triggers around types, interfaces, and generics carves a clear niche with minimal conflict risk. It is not 5 because 'types, interfaces, generics' overlaps with general JavaScript/typing-adjacent skills, fitting 'mostly distinct; minor overlap risk with closely related skills'.