/**
 * Shared tool-result utilities.
 *
 * Provides helpers for appending text to tool results and stripping
 * directive hints from text and messages.
 */
/**
 * Append text to the first text content item in a tool result,
 * or push a new text item if none exists.
 */
export declare function appendTextToToolResult(result: any, text: string): void;
/**
 * Strip directive hints from text (including legacy [Hint:] format).
 */
export declare function stripDirectives(text: string): string;
/**
 * Strip directive hints from tool result content (string or text-part array).
 */
export declare function stripDirectivesFromContent(content: string | Array<{
    type: string;
    text?: string;
}>): string | Array<{
    type: string;
    text?: string;
}>;
/**
 * Remove directive hints from an array of messages.
 * Returns the sanitized messages and a flag indicating whether anything changed.
 */
export declare function stripDirectivesFromMessages(messages: any[]): {
    messages: any[];
    changed: boolean;
};
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