/**
 * [WHO]: SubAgentRuntime class - spawn, abort, lifecycle management for SubAgents
 * [FROM]: Depends on ./sub-agent-types, ./sub-agent-backend
 * [TO]: Consumed by ./index.ts, extensions/builtin/subagent/*
 * [HERE]: core/sub-agent/sub-agent-runtime.ts - SubAgent runtime implementation
 */
import type { SubAgentBackend, SubAgentHandle, SubAgentSpec } from "./sub-agent-types.js";
/**
 * Runtime for managing SubAgents.
 * Provides spawn/abort/lifecycle operations.
 */
export declare class SubAgentRuntime {
    private backend;
    private activeAgents;
    constructor(backend: SubAgentBackend);
    /**
     * Spawn a new SubAgent with the given specification.
     * @param spec The SubAgent specification
     * @returns A handle to the spawned SubAgent
     */
    spawn(spec: SubAgentSpec): Promise<SubAgentHandle>;
    /**
     * Get all active SubAgent handles.
     */
    getActiveAgents(): SubAgentHandle[];
    /**
     * Abort all active SubAgents.
     */
    abortAll(): Promise<void>;
    /**
     * Terminate all active SubAgents.
     */
    terminateAll(): Promise<void>;
}