export interface ToolMetric {
    calls: number;
    errors: number;
    totalMs: number;
    lastCallAt: number;
}
export declare class ToolMetricsCollector {
    private metrics;
    record(toolName: string, durationMs: number, isError: boolean): void;
    getSummary(): Record<string, ToolMetric>;
    getFormatted(): string;
    reset(): void;
}
export declare function getGlobalMetrics(): ToolMetricsCollector;
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