Conciseness

The body is mostly lean, but the "Canonical response anchors" section repeats phrases verbatim from the body ("cache results", "host: {} object", "imports array", "not set pure: false", "not with @HostBinding") adding no new information, and "Directives and Pipes support signal inputs" states a fact Claude already knows. Mostly efficient with some padding that could be tightened, matching anchor 3 rather than anchor 4's minor trims.

Actionability

Concrete fragments exist ("@Pipe({ name: 'truncate', standalone: true, pure: true })", "transform(value: string, limit = 50)", "'(mouseenter)': 'show()'"), but the body contains no complete, executable directive or pipe example — the only full example is in references/composition.md and even that elides the class body with `{ ... }`. Incomplete concrete guidance matches anchor 3; anchor 4 requires concrete code with only minor gaps.

Workflow Clarity

This is a single-purpose guidance skill organized into Principles, Guidelines, and Anti-Patterns, so the simple-skill exception applies and the core task (implement standalone directives/pipes with host: {} and pure pipes) is unambiguous. It falls short of 5 because garbled fragments ("** not set pure: false**", "these decorators deprecated patterns") and the vague signal-inputs line leave minor clarity gaps; no validation steps are needed as no destructive or batch operations are involved.

Progressive Disclosure

The ~30-line body is well-sectioned with a clearly signaled, one-level-deep reference — [Composition](references/composition.md) — which exists as a real, focused 29-line file. Content is appropriately split with easy navigation, matching the under-50-lines well-organized exception and anchor 5.

Specificity

"Build custom Angular attribute directives, HostDirectives, and pure pipes" lists multiple specific concrete actions covering directive and pipe implementation comprehensively within its stated scope. It exceeds anchor 4 because there are no minor gaps in coverage of the domain it claims.

Completeness

It clearly answers "what" ("Build custom Angular attribute directives, HostDirectives, and pure pipes") and explicitly answers "when" with the concrete trigger clause "Use for Angular directive or pipe implementation, including custom attribute directives". Both are explicit and concrete, matching anchor 5; it is not anchor 4 because the when-clause is specific rather than generic.

Trigger Term Quality

"Angular directive or pipe implementation" and "custom attribute directives" are natural phrases users would say, but common variations and synonyms (e.g. "Angular pipes", "transform", file extensions like .directive.ts) are missing from the description. Good coverage, not comprehensive, so anchor 4 rather than 5.

Distinctiveness Conflict Risk

The niche (Angular directives/pipes) is distinct and the negative boundary "defer React/CSS middleware and unrelated framework work" further reduces wrong-skill triggering. Minimal conflict risk, matching anchor 5; anchor 4 would require some residual overlap with closely related skills, which the deferral clause addresses.