import { type ToolEntry } from '../common';
export type ToolChangeKind = 'added' | 'updated' | 'removed' | 'reset';
/**
 * The scope of a change event.
 * - `global`: Change affects all sessions
 * - `session`: Change affects only a specific session
 */
export type ToolChangeScope = 'global' | 'session';
export type ToolChangeEvent = {
    kind: ToolChangeKind;
    /** Whether the change affects all sessions or a specific session */
    changeScope: ToolChangeScope;
    sessionId?: string;
    relatedRequestId?: string;
    version: number;
    snapshot: readonly ToolEntry[];
};
type Listener = (e: ToolChangeEvent) => void;
export declare class ToolEmitter {
    private listeners;
    on(l: Listener): () => void;
    emit(e: ToolChangeEvent): void;
}
export {};
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