import { MCPRequest, MCPError } from '../protocol/types.js';
export interface ValidationRule {
    method: string;
    validate: (params: unknown) => ValidationResult;
}
export interface ValidationResult {
    valid: boolean;
    error?: string;
    details?: unknown;
}
export declare class ValidationMiddleware {
    private rules;
    constructor();
    private setupDefaultRules;
    addRule(rule: ValidationRule): void;
    validateRequest(request: MCPRequest): ValidationResult;
    createValidationError(result: ValidationResult, requestId?: string | number | null): MCPError;
}
export declare function validateSchema(data: unknown, schema: Record<string, unknown>): ValidationResult;
export declare function validateToolArguments(args: Record<string, unknown>, schema: Record<string, unknown>): ValidationResult;
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