An AI interface is not a classic CRUD
An AI response can take several seconds, arrive progressively, fail partially or require human validation. The UI should represent these states explicitly.
Showing only a spinner until the final response creates a poor experience and makes troubleshooting harder.
The frontend should distinguish preparation, model call, generation, validation, error and cancellation.
Signals and RxJS play complementary roles
Signals are very effective for local UI state: current result, status, filters, selection or visibility.
RxJS remains especially suitable for asynchronous streams, continuous events, debounced searches and source composition.
In an AI application, both can coexist: RxJS for stream orchestration and Signals for exposing simple state to templates.
Handling SSE or WebSocket streaming
For progressive responses, SSE is often enough when the server pushes a one-way stream to the browser. WebSocket is useful when communication must be bidirectional and persistent.
Angular components should not directly handle transport details. A dedicated service should map technical events into business events.
This abstraction makes protocol changes and reconnection logic possible without spreading transport concerns across the UI.
Always expose sources and confidence
When an answer comes from RAG or an agent, users should be able to understand where important information came from.
The frontend can display cited documents, confidence, actions executed by the agent and points requiring validation.
This transparency improves trust and reduces the risk of treating generated content as absolute truth.
Never trust the frontend for security
Hiding a button or field in Angular is not a security control. Permissions must always be enforced on the backend.
The frontend can use roles to improve user experience, but every API returning data or triggering actions must recheck authorization.
This rule is even more important when the interface can trigger AI agent actions.
Structure the frontend by domain
A sustainable Angular architecture avoids one global components folder containing the entire application. Features should be grouped by business domain.
Each domain can expose pages, components, services, models and API adapters, while shared UI elements remain in a cross-cutting layer.
This structure improves lazy loading, testing, maintenance and future evolution toward modules or micro-frontends if the product grows.
