/**
 * @license
 * Copyright 2025 Qwen
 * SPDX-License-Identifier: Apache-2.0
 */
import type { AgentEventEmitter } from '@aetherai/aether-core';
import type { AgentSideConnection } from '@agentclientprotocol/sdk';
import type { SessionContext } from './types.js';
/**
 * Tracks and emits events for sub-agent tool calls within AgentTool execution.
 *
 * Uses the unified ToolCallEmitter for consistency with normal flow
 * and history replay. Also handles permission requests for tools that
 * require user approval.
 */
export declare class SubAgentTracker {
    private readonly ctx;
    private readonly client;
    private readonly parentToolCallId;
    private readonly subagentType;
    private readonly toolCallEmitter;
    private readonly messageEmitter;
    private readonly toolStates;
    constructor(ctx: SessionContext, client: AgentSideConnection, parentToolCallId: string, subagentType: string);
    /**
     * Gets the subagent metadata to attach to all events.
     */
    private getSubagentMeta;
    /**
     * Sets up event listeners for a sub-agent's tool events.
     *
     * @param eventEmitter - The AgentEventEmitter from AgentTool
     * @param abortSignal - Signal to abort tracking if parent is cancelled
     * @returns Array of cleanup functions to remove listeners
     */
    setup(eventEmitter: AgentEventEmitter, abortSignal: AbortSignal): Array<() => void>;
    /**
     * Creates a handler for tool call start events.
     */
    private createToolCallHandler;
    /**
     * Creates a handler for tool result events.
     */
    private createToolResultHandler;
    /**
     * Creates a handler for tool approval request events.
     */
    private createApprovalHandler;
    /**
     * Creates a handler for usage metadata events.
     */
    private createUsageMetadataHandler;
    /**
     * Creates a handler for stream text events.
     * Emits agent message or thought chunks for text content from subagent model responses.
     */
    private createStreamTextHandler;
}