/**
 * GAP-RUN-003: Run Forking and Branching.
 *
 * Provides primitives for forking a run at a specific effect point,
 * creating a new branch of execution from an existing run.
 */
export interface ForkOptions {
    /** Source run to fork from. */
    sourceRunId: string;
    /** Effect ID at which to fork, or 'latest' for the current head. */
    forkPoint: string | 'latest';
    /** Optional label for the forked branch. */
    label?: string;
}
export interface ForkResult {
    /** ID of the newly forked run. */
    forkedRunId: string;
    /** The resolved fork point (effect ID). */
    forkPoint: string;
    /** Branch label for the fork. */
    branchLabel: string;
    /** ID of the parent run. */
    parentRunId: string;
}
export interface RunForkMetadata {
    /** Run ID. */
    runId: string;
    /** ISO timestamp when the run was created. */
    createdAt: string;
    /** All effect IDs in order. */
    effectIds: string[];
    /** Current status. */
    status: string;
}
/**
 * Validate fork options against the source run and produce fork metadata.
 * Throws if the fork point does not exist in the source run.
 */
export declare function prepareFork(sourceRun: RunForkMetadata, options: ForkOptions): ForkResult;
/**
 * Produce a human-readable description of a fork result.
 */
export declare function describeFork(result: ForkResult): string;
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