/**
 * Bounded progress-aware lease for the SDK prompt terminal deadline (#4334).
 *
 * The accepted prompt deadline is no longer a fixed wall-clock window from
 * acceptance: fresh *attributable* progress — tool/skill execution events
 * correlated to the exact accepted `commandId`/`turnId` at the prompt/agent
 * runtime boundary — renews the terminal deadline up to a deterministic hard
 * maximum runtime. Unrelated session noise, heartbeats, other turns, streaming
 * chatter, and retry bookkeeping never renew the lease, and there is no
 * unbounded disable value: `maxMs` is always a finite bound.
 */
export interface PromptDeadlineLease {
    /** When the prompt was accepted; anchors the hard maximum runtime. */
    readonly acceptedAt: number;
    /** Last verified attributable progress (starts at acceptance). */
    lastProgressAt: number;
    /** Inactivity window: the deadline is this far past the last verified progress. */
    readonly leaseMs: number;
    /** Deterministic hard maximum runtime from acceptance; never unbounded. */
    readonly maxMs: number;
    /** Monotonic revision used to reject stale expiry work after progress. */
    generation: number;
}
export declare function createPromptDeadlineLease(input: {
    now: number;
    leaseMs: number;
    maxMs: number;
}): PromptDeadlineLease;
/**
 * Current terminal deadline: the inactivity lease from last verified progress,
 * bounded by the hard maximum runtime from acceptance.
 */
export declare function promptDeadlineAt(lease: PromptDeadlineLease): number;
/**
 * Record fresh attributable progress. Monotonic: a stale or equal timestamp
 * never moves the lease backwards, so out-of-order delivery cannot shorten it.
 */
export declare function recordAttributableProgress(lease: PromptDeadlineLease, now: number): void;
/**
 * Whether an agent session event at the prompt/agent runtime boundary is
 * attributable progress for the accepted prompt. Only tool execution
 * boundaries qualify: skills do their work through tools, so skill progress is
 * covered; streaming text/thinking deltas, retries, and bookkeeping are not.
 */
export declare function isAttributableProgressEventType(type: string): boolean;