Conciseness

The body uses lean bullet style with no padded prose, but contains duplicated guidance (early returns appear at both 'Use early returns to reduce nesting' and the following bullet; function extraction is stated twice; optimization timing is stated twice) and many generic principles Claude already knows ('Fail fast', 'Separate concerns', 'Measure first'). This matches anchor 3 ('mostly efficient but could be tightened'), not 4 because the redundancy and well-known content are more than minor.

Actionability

Some entries give concrete, decidable criteria ('Mask or exclude passwords, tokens, PII from logs', 'Group related positional parameters into an object... when call-site clarity or coordinated evolution requires it', 'Split a file when it contains independently changing responsibilities'), but much of the guidance is abstract direction ('Keep code self-documenting where possible', 'Each function should do one thing well') that restates common knowledge. This is anchor 3 ('some concrete guidance but incomplete'), below 4 because concrete executable specifics are the minority.

Workflow Clarity

This is a principles skill, not a procedural one; partial sequences exist (refactoring: 'small steps... run tests after each change'; the reference-expansion procedure in 'Reference Representativeness') but there are no explicit validation checkpoints or feedback loops anywhere in the body. That matches anchor 3 ('sequence present but checkpoints missing or implicit'), and the simple-skill exception does not apply since this is a 165-line multi-topic skill rather than a single unambiguous action.

Progressive Disclosure

Both referenced files exist in the bundle, are one level deep, and are well signaled with purpose and trigger conditions ('read when implementing, reviewing, or fixing React/TypeScript code'; 'For concrete detection patterns used by security review, see references/security-checks.md'). Sections are clearly organized, but the 165-line body inlines dense domain-specific prose (e.g. the two-paragraph 'Reference Representativeness' section) that could arguably live in a reference, matching anchor 4 rather than 5.

Specificity

The description names the domain ('Language-agnostic coding principles') and the target qualities ('maintainability, readability, and quality'), but offers deliverable attributes rather than concrete actions the skill performs. It sits between anchor 2 (generic actions) and anchor 4 (several specific actions); the three named quality areas keep it at 3.

Completeness

Both parts are present: the 'what' ('Language-agnostic coding principles for maintainability, readability, and quality') and an explicit 'Use when...' clause with three concrete triggers. The 'what' is more abstract than anchor 5's fully concrete action list, so it fits anchor 4 ('when' explicit, 'what' could be more specific) rather than 5, and clearly above 3 since 'when' is explicit.

Trigger Term Quality

'implementing features', 'refactoring code', and 'reviewing code quality' are natural phrases users would say when needing this skill. Common variations such as 'code review', 'clean code', or 'writing code' are missing, matching the 'good keyword coverage; a few natural terms missing' anchor rather than 5.

Distinctiveness Conflict Risk

The broad coding-quality domain and the trigger 'reviewing code quality' create real overlap risk with code-review, refactoring, and security-review skills, matching anchor 3 ('somewhat specific but could still overlap with similar skills'). It is not anchor 4 because the overlap extends beyond closely related skills, and not anchor 2 because the language-agnostic framing plus explicit triggers give it a discernible niche.