/**
 * Best-effort JSON argument parsing for tool cards and plan payloads.
 */
export declare function parseJsonArgs(args: string): Record<string, unknown> | null;
export declare function firstString(record: Record<string, unknown>, keys: readonly string[]): string;
/** A short scalar rendering of one argument value, or null for objects/arrays. */
export declare function scalarText(value: unknown): string | null;