import type { DelegationCheckpointState, FailureCheckpointResult } from "./types.js";
/**
 * Tracks failure checkpoints for delegated sessions.
 *
 * At each checkpoint (60, 120, 180, 300 seconds), compares the current
 * action count against the previous checkpoint's count. If unchanged,
 * increments the failure level. At level 4 (300s), injection stops.
 */
export declare class FailureCheckpointTracker {
    private readonly checkpoints;
    /** Initialize checkpoint state for a delegation. */
    start(delegationId: string): void;
    /**
     * Evaluate a failure checkpoint.
     *
     * Called when elapsedSeconds matches one of the failure checkpoint
     * thresholds. Compares currentActionCount to the stored previous count.
     * If equal, increments failureLevel and invokes onFailure.
     */
    check(delegationId: string, elapsedSeconds: number, currentActionCount: number, onFailure: (result: FailureCheckpointResult) => void): void;
    /** Returns true if thin-line injection should continue for this delegation. */
    shouldInject(delegationId: string): boolean;
    /** Mark a delegation as completed and stop tracking. */
    stop(delegationId: string): void;
    /** Return the current checkpoint state for a delegation. */
    getState(delegationId: string): DelegationCheckpointState | undefined;
}
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