import type { AgentProgress } from "../task";
import type { EventBus } from "../utils/event-bus";
export interface ObservableSession {
    id: string;
    kind: "main" | "subagent";
    label: string;
    agent?: string;
    description?: string;
    status: "active" | "completed" | "failed" | "aborted";
    sessionFile?: string;
    lastUpdate: number;
    /** Latest progress snapshot from the subagent executor */
    progress?: AgentProgress;
}
export declare class SessionObserverRegistry {
    #private;
    /** Add a change listener. Returns unsubscribe function. */
    onChange(cb: () => void): () => void;
    setMainSession(sessionFile?: string): void;
    getSessions(): ObservableSession[];
    getActiveSubagentCount(): number;
    /** Clear all tracked sessions (e.g. on session switch). Keeps EventBus subscriptions and listeners. */
    resetSessions(): void;
    dispose(): void;
    subscribeToEventBus(eventBus: EventBus): void;
}