/**
 * Input validation and sanitization functions
 */
/**
 * Enhanced input validation for MCP tools
 */
export declare class MCPInputValidator {
    /**
     * Validate a persona identifier (name or filename)
     */
    static validatePersonaIdentifier(identifier: string): string;
    /**
     * Validate search query for collection
     */
    static validateSearchQuery(query: string): string;
    /**
     * Validate collection path
     */
    static validateCollectionPath(path: string): string;
    /**
     * Validate URL for import operations
     */
    static validateImportUrl(url: string): string;
    /**
     * Validate expiry days for sharing
     */
    static validateExpiryDays(days: number): number;
    /**
     * Validate boolean confirmation parameters
     */
    static validateConfirmation(confirm: boolean, operationName: string): boolean;
    /**
     * Validate field name for edit operations
     */
    static validateEditField(field: string): string;
    /**
     * Sanitize text for safe display output
     * Removes core shell metacharacters to prevent command injection in displayed messages
     *
     * Uses a conservative subset of shell metacharacters (;, &, |, `, $, parentheses)
     * that are most critical for command injection prevention while preserving
     * common punctuation like !, ?, * for better user experience in display contexts.
     *
     * @param text - Text to sanitize for display
     * @returns Sanitized text with core shell metacharacters removed
     */
    static sanitizeForDisplay(text: string): string;
    /**
     * Check if hostname is a private IP address (IPv4 and IPv6)
     */
    private static isPrivateIP;
    /**
     * Check for encoded private IP addresses that could bypass basic detection
     */
    private static isEncodedPrivateIP;
}
/**
 * Validate and sanitize a filename
 */
export declare function validateFilename(filename: string): string;
/**
 * Validate and sanitize a path
 */
export declare function validatePath(inputPath: string, baseDir?: string): string;
/**
 * Validate and sanitize a username
 */
export declare function validateUsername(username: string): string;
/**
 * Validate a category
 */
export declare function validateCategory(category: string): string;
/**
 * Validate content size
 */
export declare function validateContentSize(content: string, maxSize?: number): void;
/**
 * Comprehensive input validation before pattern matching
 * Validates all content types with appropriate limits
 */
export interface ContentValidationOptions {
    maxContentLength?: number;
    maxYamlLength?: number;
    maxMetadataFieldLength?: number;
    maxFileSize?: number;
}
export declare function validateInputLengths(content: string, contentType: 'full' | 'yaml' | 'metadata' | 'field', options?: ContentValidationOptions): void;
/**
 * General input sanitization
 */
export declare function sanitizeInput(input: string, maxLength?: number): string;
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