/**
 * Lightweight JSON Schema validator for process input/output schemas.
 * Supports a subset of JSON Schema draft-07: type checks (string, number,
 * boolean, array, object), required fields, and nested object properties.
 * No external dependencies.
 */
export interface ValidationResult {
    valid: boolean;
    errors: string[];
}
/**
 * Validate data against a JSON Schema (subset).
 * If schema is undefined/null, returns valid (no constraints).
 */
export declare function validateAgainstSchema(data: unknown, schema: Record<string, unknown> | undefined | null, _path?: string): ValidationResult;
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