/**
 * Exit code signaling a child escalation (mirror of child/escalation.ts —
 * duplicated on purpose so the child adapter keeps zero src/ imports).
 */
export declare const ESCALATION_EXIT_CODE = 42;
/** Env var marking a child lane as a subagent session (ask_master gate). */
export declare const ESCALATION_RUN_ID_ENV = "PI_SUBAGENTS_RUN_ID";
/** Env var carrying the escalation dir (the parent's steer dir). */
export declare const ESCALATION_DIR_ENV = "PI_SUBAGENTS_ESCALATION_DIR";
/** Payload of a `<runId>.escalation.json` file (mirror of the child shape). */
export interface EscalationFilePayload {
    runId: string;
    message: string;
    timestamp: number;
}
/** Resolve the escalation file path for a run id. */
export declare function escalationFilePath(runId: string, dir: string): string;
/** Outcome of a consume-once escalation read. */
export interface ConsumedEscalation {
    /** True when an escalation file was found (and consumed/deleted). */
    consumed: boolean;
    /** The escalated message; absent when no file existed or it was invalid. */
    message?: string;
}
/**
 * Consume the escalation file for `runId` (read + IMMEDIATE delete). Never
 * throws: a missing file returns `{ consumed: false }`, and an invalid payload
 * is still consumed (deleted) so a corrupt file cannot wedge a lane.
 */
export declare function consumeEscalation(runId: string | undefined, dir: string | undefined): ConsumedEscalation;