/**
 * GAP-TOOLS-029: Structured Output Tool.
 *
 * Parse, validate, and format structured data in JSON, YAML, Markdown,
 * and ASCII table formats.
 */
export type OutputSchemaType = 'json' | 'yaml' | 'markdown' | 'table';
export interface OutputSchema {
    /** The expected output format. */
    type: OutputSchemaType;
    /** Optional JSON Schema subset for validation (type, properties, required). */
    schema?: {
        type?: string;
        properties?: Record<string, {
            type: string;
        }>;
        required?: string[];
    };
}
export interface StructuredOutputResult {
    /** The raw input string. */
    raw: string;
    /** The parsed data (or null if parsing failed). */
    parsed: unknown;
    /** Whether the output is valid against the schema. */
    valid: boolean;
    /** Validation error messages. */
    errors: string[];
}
/**
 * Parse raw string input and validate against an OutputSchema.
 */
export declare function parseStructuredOutput(raw: string, schema: OutputSchema): StructuredOutputResult;
/**
 * Format an array of objects as an ASCII table.
 */
export declare function formatAsTable(data: Array<Record<string, unknown>>, columns?: string[]): string;
/**
 * Format structured data as markdown.
 */
export declare function formatAsMarkdown(data: unknown): string;
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