export declare function verbForToolName(toolName: string | undefined): string | undefined;
export declare class InFlightToolTracker {
    private readonly inFlight;
    start(toolUseId: string, toolName: string): void;
    finish(toolUseId: string): void;
    current(): string | undefined;
    reset(): void;
}
export interface ActiveToolNameSink {
    setActiveToolName?(toolName: string | undefined): void;
}
interface MaybeToolEvent {
    type: string;
    chunk?: {
        type: string;
        toolUseId?: string;
        toolName?: string;
    };
}
export declare function noteToolEvent(event: MaybeToolEvent, tracker: InFlightToolTracker, sink: ActiveToolNameSink | null | undefined): boolean;
export {};