export type LogLevel = 'debug' | 'info' | 'warn' | 'error';
export interface LogEntry {
    timestamp: string;
    level: LogLevel;
    message: string;
    correlationId?: string;
    [key: string]: unknown;
}
export interface Logger {
    debug(message: string, data?: Record<string, unknown>): void;
    info(message: string, data?: Record<string, unknown>): void;
    warn(message: string, data?: Record<string, unknown>): void;
    error(message: string, data?: Record<string, unknown>): void;
    child(defaultData: Record<string, unknown>): Logger;
}
/**
 * In-memory metrics collector (singleton).
 * Counters reset on process restart.
 */
export declare class MetricsCollector {
    private static instance;
    toolCallsTotal: number;
    toolCallErrors: number;
    tokenRefreshTotal: number;
    tokenRefreshErrors: number;
    static getInstance(): MetricsCollector;
    /** Reset for testing */
    static resetInstance(): void;
    getMetrics(): {
        toolCallsTotal: number;
        toolCallErrors: number;
        tokenRefreshTotal: number;
        tokenRefreshErrors: number;
    };
}
/**
 * Get platform-aware default log directory.
 */
export declare function getDefaultLogDir(): string;
/**
 * Create a structured JSON logger.
 * logDir defaults to platform-aware directory.
 * minLevel defaults to 'info' — set to 'debug' for verbose output.
 * Falls back to stderr if logDir is not writable.
 */
export declare function createLogger(logDir?: string, minLevel?: LogLevel): Logger;
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