import type { AgentRecord } from "../types.js";
export type ViewerAgent = Pick<AgentRecord, "id" | "startedAt">;
export interface SubagentViewerState {
    /** Selected agent id while auto-follow is paused. */
    selectedAgentId?: string;
    /** Last selected creation-order index, used to choose a stable neighbor after removal. */
    selectedIndex: number;
    /** When true, the viewer follows the newest current-session agent. */
    autoFollow: boolean;
}
export interface SubagentViewerSnapshot<TAgent extends ViewerAgent> {
    agents: TAgent[];
    selectedAgent?: TAgent;
    selectedAgentId?: string;
    selectedIndex: number;
    count: number;
    hasAgents: boolean;
    hasPrevious: boolean;
    hasNext: boolean;
    autoFollow: boolean;
}
export declare function createSubagentViewerState(): SubagentViewerState;
export declare function getSubagentViewerSnapshot<TAgent extends ViewerAgent>(agents: readonly TAgent[], state: SubagentViewerState): SubagentViewerSnapshot<TAgent>;
export declare function selectSubagentByIndex<TAgent extends ViewerAgent>(agents: readonly TAgent[], state: SubagentViewerState, index: number): SubagentViewerState;
export declare function selectNextSubagent<TAgent extends ViewerAgent>(agents: readonly TAgent[], state: SubagentViewerState): SubagentViewerState;
export declare function selectPreviousSubagent<TAgent extends ViewerAgent>(agents: readonly TAgent[], state: SubagentViewerState): SubagentViewerState;
export declare function pauseSubagentAutoFollow<TAgent extends ViewerAgent>(agents: readonly TAgent[], state: SubagentViewerState): SubagentViewerState;
export declare function resumeSubagentAutoFollow<TAgent extends ViewerAgent>(agents: readonly TAgent[], state: SubagentViewerState): SubagentViewerState;