/**
 * diff-empty grader — assert that the stimulus produced no workspace changes.
 *
 * Useful for no-op evals where the agent should correctly decide nothing
 * needed changing.
 */
import type { Grader, GraderInput, GraderMetadata, GraderResult } from "../../index.js";
export declare class DiffEmptyGrader implements Grader {
    metadata: GraderMetadata;
    constructor();
    grade(input: GraderInput): Promise<GraderResult>;
}
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