Conciseness

The body is lean bullet guidance with exact API names and no re-explanation of concepts Claude already knows, but "Never update signals inside effect()" appears verbatim in both section 4 and the 'Canonical response anchors' section, making that closing section redundant padding. This matches the 'efficient; minor instances of over-explanation that could be trimmed' anchor rather than the fully lean 5.

Actionability

Concrete API-level instructions ("expose publicly via asReadonly()", "linkedSignal(() => source())", "withState, withComputed, withMethods, and withEntities()") plus working code in references/signal-store.md give mostly executable guidance. It stops short of 5 because there is no executable example of effect() or linkedSignal() usage, and the reference's withComputed block contains only a placeholder comment ("// filter logic derived from state") instead of real filter logic.

Workflow Clarity

The numbered principles are clearly organized with explicit decision rules (e.g., "Use effect() only for side effects", "Never update signals inside effect()"), and no destructive/batch validation cap applies. It falls short of 5 because the key store-vs-service decision hinge "For complex features" is undefined, leaving the main routing decision implicit rather than giving a concrete criterion.

Progressive Disclosure

The body is a concise overview (~40 lines) with a single one-level-deep reference (references/signal-store.md) that exists on disk and is clearly signaled with descriptive link text both inline ("See [signal store pattern](references/signal-store.md)") and in a dedicated References section. This matches the 5 anchor: clear overview, well-signaled, appropriately split, easy navigation.

Specificity

"Implement application state with Angular Signals, computed derivations, and NgRx Signal Store" names the domain plus several concrete capability areas with exact technology names, matching the 'several specific actions; minor gaps' anchor. It falls short of 5 because the what-clause doesn't comprehensively cover the skill's capabilities (e.g., effect()/side-effect handling is only in the when-clause), and exceeds 3 because it lists more than 1-2 concrete actions.

Completeness

The description explicitly answers both what ("Implement application state with Angular Signals, computed derivations, and NgRx Signal Store") and when ("Use when implementing reactive state with signal(), computed(), effect(), or @ngrx/signals in Angular") with concrete trigger phrases. This matches the 5 anchor; the 4 anchor's 'when could be more explicit' caveat doesn't apply since the when-clause already names specific APIs.

Trigger Term Quality

Terms like "signal(), computed(), effect(), @ngrx/signals", "Angular Signals", "NgRx Signal Store", and "reactive state" are natural phrases users would say. It falls short of the 5 anchor because common variations like "state management", "store", or file extensions (e.g., .store.ts) are absent, and it is clearly above 3 since coverage goes beyond a single keyword.

Distinctiveness Conflict Risk

Angular-specific triggers with named APIs (@ngrx/signals, signal(), computed()) carve out a clear niche with minimal conflict risk against other skills. The 4 anchor's 'minor overlap risk with closely related skills' is less fitting since the technology names are unambiguous.