The body is lean (under ~35 lines), assumes Angular competence, and never explains what Angular, directives, or pipes are; every section delivers rule-plus-snippet with no padding, matching the 'lean and efficient; every token earns its place' anchor. Not 2 because there is no redundant concept explanation despite a brief caching rationale that justifies a rule.

It gives concrete decorator fragments — '@Pipe({ name: 'truncate', standalone: true, pure: true })', 'transform(value: string, limit = 50)', "selector: '[appHighlight]'" — but these are partial signatures without complete executable bodies (e.g. transform has no implementation), fitting the 'some concrete guidance but incomplete' anchor rather than copy-paste-ready code.

This is a simple pattern-reference skill with no destructive/batch operation requiring validation checkpoints, and the content is cleanly organized into Principles, Guidelines, and Anti-Patterns; per the simple-skill scoring note, clear organization of an unambiguous task earns 3. Not 2 because no feedback loop is required for writing directives/pipes.

The body is a concise overview that links to one real, one-level-deep reference ([Composition](references/composition.md)) — verified to exist — and is otherwise self-contained and well-sectioned, matching the 'clear overview with well-signaled one-level-deep references' anchor; the under-50-line simple-skill note also supports 3.

Lists concrete Angular-specific actions — 'Compose HostDirectives and Pure Pipes' — naming the exact APIs rather than vague domain language, matching the 'multiple specific concrete actions' anchor.

Explicitly answers both what ('Compose HostDirectives and Pure Pipes in Angular') and when ('Use when creating attribute directives with HostDirectives or writing pure pipes'), satisfying the explicit-trigger 'what AND when' anchor.

It repeats the same two technical terms ('HostDirectives', 'pure pipes') rather than offering natural variations a user might say; missing common phrasings like 'Angular pipe', 'format/transform pipe', or 'attribute directive' broadly, so it lands at 'some relevant keywords but missing common variations' rather than full coverage.

The HostDirectives / pure-pipes niche is narrow with distinct API-level triggers unlikely to fire for unrelated skills; it is not below 3 because the triggers are specific enough to avoid generic overlap, and not above since the scale caps at 3.