export type ToolPairStatus = 'completed' | 'cancelled' | 'in_progress' | 'validation_failed';
export interface ToolRequestRecord {
    requestId: string;
    name: string;
    args: unknown;
    startedAt: number;
}
export interface ToolResponseRecord {
    requestId: string;
    status: ToolPairStatus;
    result?: unknown;
    error?: string;
    finishedAt: number;
}
export interface ToolCallPair {
    request: ToolRequestRecord;
    response: ToolResponseRecord;
}
export interface CancelledToolResult {
    __tool_status: 'CANCELLED';
    requestId: string;
    name: string;
}
export interface InProgressToolResult {
    __tool_status: 'IN_PROGRESS';
    requestId: string;
    name: string;
    interim?: string;
}
export declare function cancelledPlaceholder(requestId: string, name: string): CancelledToolResult;
export declare function inProgressPlaceholder(requestId: string, name: string, interim?: string): InProgressToolResult;
export declare class PairingTracker {
    private pairs;
    openRequest(name: string, args: unknown, requestId?: string): string;
    closePair(requestId: string, status: ToolPairStatus, result?: unknown, error?: string): ToolCallPair;
    getPair(requestId: string): ToolCallPair | undefined;
    getAllPairs(): ToolCallPair[];
    hasDanglingRequests(): boolean;
}