Generates Angular code and provides architectural guidance. Trigger when creating projects, components, or services, or for best practices on reactivity (signals, linkedSignal, resource), forms, dependency injection, routing, SSR, accessibility (ARIA), animations, styling (component styles, Tailwind CSS), testing, or CLI tooling.
Write disciplined Behavior-Driven Development specs and tests with Gherkin / Cucumber. Use whenever the user mentions BDD, Gherkin, Cucumber, .feature files, Given/When/Then, scenarios, Scenario Outline, Background, step definitions, acceptance criteria, executable specifications, living documentation, the Three Amigos, or Example Mapping. Also trigger when the user asks to "write tests in plain English", convert acceptance criteria into tests, design step definitions, refactor an imperative or UI-coupled feature file, or wire up BDD with Vitest (unit/component) or Playwright (end-to-end). Do NOT use for pure unit tests with no business-readable contract, pure performance/load tests, or generic test-framework questions unrelated to behavior specs.
Build, refactor, and architect Angular state with the @ngrx/signals Signal Store. Use whenever the user mentions signalStore, withState, withMethods, withComputed, withHooks, signalStoreFeature, withEntities, rxMethod, signalMethod, patchState, or wants to refactor BehaviorSubject/service-based state to Signal Store. Also use for designing custom store features, request status, optimistic updates, entity collections, and the store/service split in Angular. Do NOT use for @ngrx/store (classic Redux), createReducer/createEffect, or generic RxJS questions unrelated to Signal Store.