/**
 * Structured auth event logger.
 * CoSAI MCP-T12: Log auth events for SIEM correlation.
 */
export declare function logAuthEvent(event: string, clientId: string, details?: Record<string, unknown>): void;
/**
 * Tool invocation audit logger.
 * CoSAI MCP-T12: Log every tool call with tool name, parameters, user ID, timestamp.
 *
 * Logs are written to stderr (structured JSON) for collection by CloudWatch/Datadog/etc.
 */
export declare function logToolInvocation(toolName: string, params: Record<string, unknown>, clientId: string, result: {
    success: boolean;
    durationMs: number;
}): void;
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