The Tool Desk
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What the interface should explain
A useful agent UI answers the questions a user has while a run is underway: Is it waiting, progressing, finished, or in error? What operation is active, if any? Is there a result to read? What can the user do next? The interface should report only what the runtime actually knows. For example, show “Running search” only when an event or other authoritative runtime fact establishes that a search operation is active; do not use “thinking” as a generic label for any interval without a response.
Angular does not prescribe an agent state machine. Define one from your backend’s event protocol and product behavior, then represent it with Angular’s signal primitives. A signal is a readable reactive value: Angular tracks where it is read and notifies dependent consumers when it changes. The Angular Signals overview describes this granular tracking model.
Separate runtime facts from display state
Keep writable state for facts received from the runtime, and derive the presentation from those facts. The exact fields depend on the agent backend and its event protocol; do not add fields just because a UI pattern expects them.
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Store what the runtime actually supplies
An illustrative run might keep an identifier, user-visible messages, the current phase, an active tool operation when one exists, supplied timestamps or event data, and an error that should be shown. Update these values when the application receives the corresponding runtime information. Treat nested values as immutable by convention: a read-only signal does not prevent deep mutation, so replace or update data in a way that notifies signal consumers.
Derive what the user should see
Use computed() for deterministic display state such as concise status text, progress-indicator visibility, result visibility, retry or stop availability, and whether a tool-event detail panel is open. Computed signals are read-only and update when signals they read change. This keeps presentation logic tied to its source facts instead of maintaining a second, potentially inconsistent copy.
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Read signals in templates or computed derivations so Angular can track those consumers and refresh the UI when the values change. If a derived value also needs to be manually set, consider linkedSignal(); for ordinary derivation, prefer computed(). Angular’s Signals essentials introduces signal state and component usage, while the Signals overview covers computed values and advanced derivations.
Represent asynchronous work truthfully
A single indefinite spinner hides important differences between waiting, loading, reloading, completion, and failure. Angular resources expose status, value, loading, and error signals that can drive feedback in the interface. Angular documents resource statuses including idle, error, loading, reloading, resolved, and local. Map those statuses to product language only when the meanings match: resource loading does not, by itself, prove that an agent is reasoning or that a particular tool is running.
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Angular’s resource guide says, “You can use this status information to conditionally display user interface elements, such as loading indicators and error messages.” Decide which states matter to the user and show suitable copy and controls for them. For example, make a result visible when one is available, and present an error only when an error is actually available to report.
Choose one-shot loading or a stream
Match the integration to the way the agent delivers updates. A one-time operation that resolves once fits a resource loader or another one-shot asynchronous integration. A source that sends repeated updates—such as progress or tool events—fits a streaming approach. Angular documents resource stream for continuously updating data and gives WebSockets, Server-Sent Events, and Firestore listeners as examples.
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| Approach | Use when | What to consider |
|---|---|---|
Resource loader or another one-shot integration |
The operation produces a result once. | Represent loading, completion, and errors; decide whether a previous result should remain visible during a subsequent load. |
Resource stream or another streaming integration |
The source produces incremental updates, such as progress or tool events. | Align updates with the transport and protocol; decide which incoming events establish each user-visible status. |
The resource API also provides cancellation support and status information. Its loader receives an AbortSignal; Angular aborts an outstanding load when parameters change, but underlying work such as fetch must use the supplied signal to respond to cancellation. The product’s policy for stopping or superseding an agent run remains application-specific. During reloading, Angular resources can retain a previous value, so choose deliberately whether that value remains visible alongside the new activity.
Use effects for work outside the signal graph
Use computed() or linkedSignal() when one piece of application state relates to another. Do not mirror one signal into another with an effect() just to propagate state. Angular warns that effect-based propagation can cause expression-changed errors, circular updates, or unnecessary change detection.
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Effects are for synchronization with imperative systems outside the normal signal graph, such as logging, browser storage, or a third-party renderer. They run asynchronously during change detection, and Angular’s effects guide advises: “Effects should be the last API you reach for.”
Keep reactive dependencies explicit across async work
Signals read after an asynchronous boundary are not tracked in the earlier reactive context. If a signal must be a dependency of that reactive computation, read it before await. This matters when asynchronous code combines agent requests with reactive parameters: make the dependencies explicit at the point where Angular can track them.
For resource loaders, pass the provided abort signal to cancellable underlying work such as fetch. That lets the work respond when Angular aborts an outstanding load after parameters change; it does not decide whether the user should be allowed to stop an agent or how a superseded run is handled. Those policies belong to the application.
Quick Recap
A practical implementation checklist
- Define states from the backend’s actual events and facts; Angular does not supply an agent-specific state machine.
- Keep runtime facts in writable signals and derive labels, visibility, and control availability with
computed(). - Read signals in templates or derivations so Angular can track consumers.
- Choose a one-shot loader for one-time results and a stream for repeated updates.
- Make loading, reloading, resolved, and error feedback distinct where those distinctions are meaningful to the user.
- Use
effect()for synchronization with imperative APIs, not as a substitute for derived state. - Read reactive dependencies before
awaitwhen they need to be tracked, and update nested state immutably so consumers are notified.
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