export type SenderType = 'human' | 'ai_agent';
export type TurnLifecycleState = 'idle' | 'thinking' | 'streaming' | 'tool' | 'waiting_input' | 'completed' | 'interrupted';
export type TurnMessageSemantics = 'progress' | 'turn_complete' | 'control';
export type DeliveryIntent = 'queue' | 'interrupt' | 'interleave' | 'stop';
export type InboundDisposition = 'queued' | 'accepted_now' | 'interleaved' | 'trigger_suppressed' | 'rejected' | 'cancelled';
export interface TurnMetadata {
    turnId?: string | null;
    turnSemantics?: TurnMessageSemantics;
    deliveryIntent?: DeliveryIntent;
    replyBehavior?: 'allow_auto_reply' | 'suppress_auto_reply';
    inboundDisposition?: InboundDisposition;
    requestedTurnMode?: string;
}
export interface TriggerDecision {
    allow: boolean;
    semantics: TurnMessageSemantics;
    reason: string;
}
export interface TurnStateLike {
    state: TurnLifecycleState;
    openedAt?: number;
    updatedAt?: number;
    turnUpdatedAt?: number | null;
}
export declare const ACTIVE_TURN_STALE_THRESHOLD_MS: number;
export declare const WAITING_INPUT_STALE_THRESHOLD_MS: number;
export declare function normalizeTurnMetadata(metadata: unknown): TurnMetadata | null;
export declare function isTurnOpen(turnState: TurnStateLike | null | undefined): boolean;
export declare function getTurnStateStaleThresholdMs(state: TurnLifecycleState): number;
export declare function isTurnStateStale(turnState: TurnStateLike | null | undefined): boolean;
export declare function resolveTurnMessageSemantics(input: {
    senderType: SenderType;
    metadata?: unknown;
}): TurnMessageSemantics;
export declare function shouldPromoteConversationMessage(input: {
    senderType: SenderType;
    metadata?: unknown;
}): boolean;
export declare function shouldTriggerAgentTurn(input: {
    senderType: SenderType;
    metadata?: unknown;
}): TriggerDecision;
export declare function normalizeRuntimeTurnState(value: unknown): TurnStateLike | null;