/**
 * Input validation utilities
 */
import type { Configuration, Message, ModelConfig } from '../types/index.js';
/**
 * Validate OpenRouter API key format
 * Format: sk-or-v1-{random_string}
 */
export declare function validateApiKey(apiKey: string): boolean;
/**
 * Validate configuration object
 */
export declare function validateConfig(config: unknown): config is Configuration;
/**
 * Validate model configuration object
 */
export declare function validateModelConfig(model: unknown): model is ModelConfig;
/**
 * Validate message object
 */
export declare function validateMessage(message: unknown): message is Message;
/**
 * Validate ISO 8601 date string
 */
export declare function isValidISODate(dateString: string): boolean;
/**
 * Validate UUID v4 format
 */
export declare function isValidUUID(uuid: string): boolean;
/**
 * Validate message role alternation in conversation
 * After first user message, messages must alternate between user/assistant
 */
export declare function validateMessageAlternation(messages: Message[]): boolean;
/**
 * Validate chronological order of message timestamps
 */
export declare function validateChronologicalOrder(messages: Message[]): boolean;
/**
 * Sanitize user input to prevent injection attacks
 */
export declare function sanitizeInput(input: string): string;
/**
 * Validate working directory path
 */
export declare function isValidPath(dirPath: string): boolean;
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