@API(status = API.Status.STABLE)
    public @NonNull Collection<@NonNull CloudCapability> capabilities() {
        return Collections.unmodifiableSet(new HashSet<>(this.capabilities));
    }
Returns an unmodifiable snapshot of the currently registered {@link CloudCapability capabilities}.

@return the currently registered capabilities
@see #hasCapability(CloudCapability)
cloud-core/src/main/java/org/incendo/cloud/CommandManager.java