/**
 * Token-efficient response formatting for MCP tool results.
 *
 * Mirrors the elnora-cli's --compact and --fields flags:
 * - compact: strips null/undefined/empty values (saves ~30-40% tokens)
 * - fields: only includes specified fields in response objects
 *
 * Applied transparently by withGuard() — individual tool handlers don't
 * need to change. Non-JSON responses pass through untouched.
 */
import { z } from "zod";
/**
 * Shared Zod schema fragment for output options.
 * Spread this into any tool's inputSchema to enable compact/fields.
 */
export declare const OUTPUT_OPTIONS_SCHEMA: {
    compact: z.ZodOptional<z.ZodDefault<z.ZodBoolean>>;
    fields: z.ZodOptional<z.ZodString>;
};
/**
 * Post-process a JSON string tool result with compact/fields options.
 * Returns the original string unchanged if no options are active or if
 * the string is not valid JSON.
 */
export declare function formatToolResult(jsonString: string, options: {
    compact?: boolean;
    fields?: string;
}): string;
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