import { ToolInstance } from './tool.instance';
export type ToolChangeKind = 'added' | 'updated' | 'removed' | 'reset';
export type ToolChangeEvent = {
    kind: ToolChangeKind;
    scope: 'global' | 'session';
    sessionId?: string;
    relatedRequestId?: string;
    version: number;
    snapshot: readonly ToolInstance[];
};
type Listener = (e: ToolChangeEvent) => void;
export declare class ToolEmitter {
    private listeners;
    on(l: Listener): () => void;
    emit(e: ToolChangeEvent): void;
}
export {};