/**
 * Structured output support (roadmap 1.2).
 *
 * MCP tools may expose a typed `structuredContent` payload alongside the
 * human/agent-readable Markdown text. When a tool declares an `outputSchema`,
 * the SDK validates `structuredContent` on every successful response and
 * skips validation when `isError` is set. Tools therefore return a
 * `StructuredToolResult` and the registration handler converts it via
 * `toMcpResult`.
 */
import type { CallToolResult } from "@modelcontextprotocol/sdk/types.js";
export interface StructuredToolResult {
    /** Always present: the Markdown text channel. */
    markdown: string;
    /** Typed payload, validated against the tool's outputSchema (success only). */
    structured?: Record<string, unknown>;
    /** When true, this is an error result; structured-output validation is skipped. */
    isError?: boolean;
}
/**
 * Converts a tool's `StructuredToolResult` into the MCP `CallToolResult`.
 * - Error → `{ content, isError: true }` (no structured payload required).
 * - Success → `{ content, structuredContent }` when a payload is present.
 */
export declare function toMcpResult(result: StructuredToolResult): CallToolResult;
export interface SidraRecords {
    /** Column labels, in order (from the SIDRA header row). */
    colunas: string[];
    /** Data rows as label→value objects. */
    registros: Record<string, string>[];
    /** Total number of data rows. */
    totalRegistros: number;
}
/**
 * Converts a SIDRA-style response into labeled columns + records. The first
 * element of `data` is the header/label row; the rest are data rows keyed the
 * same way. Shared by every SIDRA-backed tool's structured output.
 */
export declare function sidraRecords(data: Record<string, string>[]): SidraRecords;
/**
 * Field selection for SIDRA-style data (roadmap 1.2): keeps only the columns
 * whose header label matches one of the comma-separated `campos` tokens
 * (accent/case-insensitive substring match). Filters the header and every data
 * row, so both the structured payload and the Markdown table shrink together.
 *
 * Returns the data unchanged when `campos` is empty or matches no column (so a
 * mistaken filter never blanks out the result).
 */
export declare function selectSidraColumns(data: Record<string, string>[], campos?: string): Record<string, string>[];
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