/**
 * In-memory tool usage metrics for the Frihet MCP server.
 *
 * Tracks per-tool call counts, error counts, and average duration.
 * Metrics are logged on graceful shutdown (SIGINT/SIGTERM in Node.js)
 * or can be retrieved at any time via getMetrics().
 */
/**
 * Record a completed tool call.
 */
export declare function recordToolCall(tool: string, durationMs: number, success: boolean): void;
/**
 * Get current metrics snapshot.
 */
export declare function getMetrics(): {
    tools: Record<string, {
        calls: number;
        errors: number;
        avgMs: number;
    }>;
    uptime: number;
};
/**
 * Register shutdown handlers (Node.js only).
 * In Workers, metrics are per-request and logged via console automatically.
 */
export declare function registerShutdownHook(): void;
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