Conciseness

The body is dense and assumes competence (no explanation of what Observables or Signals are), but it is not a 5 because of redundancy: "toSignal auto-unsubscribes on component destroy" is repeated verbatim in the 'Auto-Unsubscribe' bullet, and the 'Race Conditions' bullet re-states the initialValue advice from the first principle.

Actionability

Concrete API names, the import path (@angular/core/rxjs-interop), and pipe fragments like `http.get<User[]>(...).pipe(catchError(() => of([])))` are given, but the code is elided (`...`) and no complete executable snippet shows an actual toSignal/toObservable conversion, matching the 'concrete guidance but incomplete / missing key details' anchor rather than level 4's 'concrete code with minor gaps'.

Workflow Clarity

For a simple single-purpose skill the decision rules are clear and unambiguous (async-to-sync via toSignal with initialValue in injection context; sync-to-async via toObservable when operators are needed; takeUntilDestroyed for manual subscriptions), but it stops short of level 5 because there is no explicit decision sequence or checkpoint for the POST/PUT path beyond 'trigger explicit subscribe() or lastValueFrom()'.

Progressive Disclosure

The skill is under 50 lines, well-organized into labeled sections (Principles, Guidelines, Anti-Patterns, References), and its single reference [references/observables-vs-signals.md] is a real, one-level-deep file clearly signaled under a References heading — meeting the simple-skill exception for a top score.

Specificity

"Bridge Observables and Signals using toSignal and toObservable in Angular" names the domain and exactly two concrete actions (Observable-to-Signal, Signal-to-Observable), matching the '1-2 concrete actions, but not comprehensive' anchor; it does not reach level 4 because it omits related capabilities a comprehensive interop skill covers (e.g., takeUntilDestroyed cleanup, httpResource, injection-context requirements).

Completeness

Both parts are present: a clear 'what' ("Bridge Observables and Signals using toSignal and toObservable in Angular") and an explicit 'when' ("Use when converting between RxJS Observables and Angular Signals"); it is not a 5 because the when-clause merely restates the what rather than adding distinct concrete trigger phrases.

Trigger Term Quality

Natural terms a developer would say are present — "toSignal", "toObservable", "RxJS Observables", "Angular Signals", "converting" — giving good keyword coverage; it falls short of level 5 because common phrasings like "observable to signal", "stream", or "unsubscribe" are not covered.

Distinctiveness Conflict Risk

This is a clear niche (Angular RxJS/Signals interop) with named APIs (toSignal, toObservable) that no other plausible skill would claim, so conflict risk is minimal.