/**
 * Maximum number of action buttons allowed inside a single `card` block.
 */
export declare const CARD_ACTIONS_MAX = 2;
/**
 * Checks that every `card` block contains at most {@link CARD_ACTIONS_MAX}
 * action buttons. Slack's card surface only renders up to two action buttons
 * in the action row; additional buttons are clipped or rejected.
 * @param blocks - array of Block Kit blocks
 * @returns array of error messages (empty when no card exceeds the limit)
 */
export declare function checkCardActionsMax(blocks: readonly {
    type?: string;
    actions?: readonly unknown[];
}[]): string[];
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