import type { SubagentHandleImpl } from '../../subagent/handle.js';
import type { ToolResult } from '../types.js';
export interface ProgressEventPayload {
    message: string;
    phase?: string;
    metadata?: Record<string, unknown>;
}
export declare const PROGRESS_RING_CAPACITY = 20;
export declare const PROGRESS_MAX_MESSAGE_BYTES = 2048;
export declare function formatProgressEvent(payload: ProgressEventPayload, subagentId: string): string;
export declare function createEmitProgressHandler(handle: SubagentHandleImpl<unknown>, parentQueueFn: (text: string) => void, parentAbortSignal: AbortSignal | undefined): (input: unknown, _signal: AbortSignal) => Promise<ToolResult>;