import { FabricError } from './error.js';
import type { ResultExtractionOptions, ResultValidator } from './types.js';
export declare const RESULT_START_DELIMITER = "---RESULT_START---";
export declare const RESULT_END_DELIMITER = "---RESULT_END---";
export declare const FINISH_TOOL_NAME = "finish";
export declare const GIVE_UP_TOOL_NAME = "give_up";
/** Thrown when the LLM calls the `give_up` tool, indicating it cannot produce a
 * result that conforms to the required schema. */
export declare class ResultUnavailableError extends FabricError {
    constructor(reason: string);
}
/** Footer appended to user prompts/skill bodies when a `result` schema is set. */
export declare function buildResultFooter(): string;
/** Follow-up prompt sent when the LLM ends a turn without calling `finish` or `give_up`. */
export declare function buildResultFollowUpPrompt(): string;
export declare function validateResult<TResult>(value: unknown, validator?: ResultValidator<TResult>, extraction?: boolean | ResultExtractionOptions): Promise<TResult>;
export declare function extractResultValue(value: unknown, extraction?: boolean | ResultExtractionOptions): unknown;
export declare function buildResultRetryPrompt(error: unknown, extraction?: boolean | ResultExtractionOptions): string;
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