export interface ToolMetrics {
    name: string;
    totalCalls: number;
    successCount: number;
    errorCount: number;
    totalDurationMs: number;
    avgDurationMs: number;
    lastCalledAt?: number;
}
export declare class MetricsService {
    private readonly logger;
    private readonly metrics;
    recordCall(toolName: string, durationMs: number, success: boolean): void;
    private getOrCreateMetric;
    getMetrics(): ToolMetrics[];
    getToolMetrics(toolName: string): ToolMetrics | undefined;
    toPrometheus(): string;
}
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