import { z } from 'zod';
/**
 * WIP has no `Tracing.*` / `Performance.getMetrics` domain, so chrome-devtools-mcp's
 * `performance_start_trace` / `performance_analyze_insight` are unimplementable.
 * However the JavaScript `PerformanceObserver` + `performance.getEntriesByType` APIs
 * are available inside the WebView. This tool reads them via `Runtime.evaluate`
 * and returns structured metrics — a JS-side approximation that covers the
 * majority of the chrome-devtools-mcp Performance use cases (navigation timing,
 * paint timing, LCP, CLS, slow resources).
 */
export declare const getPerformanceMetricsTool: {
    name: string;
    description: string;
    inputSchema: {
        slowResourceMs: z.ZodOptional<z.ZodNumber>;
        resourceLimit: z.ZodOptional<z.ZodNumber>;
    };
    handler: ({ slowResourceMs, resourceLimit, }: {
        slowResourceMs?: number;
        resourceLimit?: number;
    }) => Promise<{
        content: {
            type: "text";
            text: string;
        }[];
    }>;
};