import { type SessionCheckpoint } from "#execution/session/handoff.js";
/**
 * Oldest checkpoint a successor upgrades (eve 0.66.0). Earlier checkpoints
 * predate the sandbox provider and dynamic skill manifest contracts and lack
 * data the current reader requires.
 */
export declare const MIN_SESSION_CHECKPOINT_VERSION = 8;
export type SessionCheckpointMigration = {
    readonly kind: "current";
    readonly checkpoint: SessionCheckpoint;
    /** Idle child sessions the current build no longer tracks; the successor stops them. */
    readonly childRunIdsToStop: readonly string[];
} | {
    readonly kind: "incompatible";
    readonly detail: string;
};
/**
 * Upgrades a checkpoint written by an older eve build to the current shape.
 * Pure, so the session workflow can run it before validation. Newer
 * checkpoints and those older than {@link MIN_SESSION_CHECKPOINT_VERSION} are
 * incompatible.
 */
export declare function migrateSessionCheckpoint(checkpoint: unknown): SessionCheckpointMigration;