import type { Stimulus } from "../eval/types.js";
import type { Trajectory } from "../trajectory/types.js";
import type { Executor, ExecutorOptions } from "./types.js";
/**
 * A zero-dependency executor that returns a minimal valid trajectory
 * without making any API calls or spawning external processes.
 *
 * Useful for:
 * - Testing graders in isolation (feed fixture responses)
 * - CI pipelines that validate eval YAML without a live agent
 * - Benchmarking the pipeline itself (no executor latency)
 *
 * Fixture support: if a JSON file exists at
 * `<workDir>/.mock-executor/<stimulus.name>.json`, its content is used
 * as the assistant response output. The file must contain a JSON object
 * with an `output` string field and an optional `events` array.
 */
export declare class MockExecutor implements Executor {
    readonly name = "mock";
    readonly supportsPreparedWorkspace = true;
    readonly supportsMultiTurn = true;
    /**
     * The `ExecutorOptions` from the most recent `execute()` call. Exposed for
     * tests to assert what the pipeline forwarded (e.g. `model`,
     * `reasoningEffort`) without touching the server-parsed trajectory metadata.
     */
    lastReceivedOptions?: ExecutorOptions;
    /**
     * Execute a stimulus by returning a minimal trajectory.
     *
     * If a fixture file exists at `<workDir>/.mock-executor/<stimulus.name>.json`,
     * its `output` and optional `events` are used. Otherwise the stimulus prompt
     * is echoed back as the trajectory output.
     *
     * @param stimulus - The eval stimulus to execute.
     * @param options - Execution options including workDir and optional model/sessionID.
     * @returns A trajectory with the fixture or echoed output, computed metrics
     *   (derived from fixture events, or near-zero when no fixture is present), and mock metadata.
     */
    execute(stimulus: Stimulus, options: ExecutorOptions): Promise<Trajectory>;
    shutdown(): Promise<void>;
    /**
     * Load an optional fixture file from `<workDir>/.mock-executor/<name>.json`.
     * Returns `undefined` when the file doesn't exist or can't be parsed.
     */
    private loadFixture;
}
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