/**
 * @license
 * Copyright 2026 Steven Roussey <sroussey@gmail.com>
 * SPDX-License-Identifier: Apache-2.0
 */
import type { ITask, Usage } from "@workglow/task-graph";
export interface TaskUsageState {
    readonly usage: Usage | undefined;
    readonly modelId: string | undefined;
}
/**
 * Subscribes to a task's `usage` event and returns its running token total plus
 * the model id that produced it (when the provider named one).
 *
 * Deliberately does NOT clear on `stream_end` or completion, unlike the stream
 * text hook: streaming text is transient, but the final token count is the
 * result and stays on the row.
 */
export declare function useTaskUsage(task: ITask): TaskUsageState;