export type AttemptPhase = "preparing-workspace" | "running-step" | "succeeded" | "failed" | "canceled";
export type FailureCategory = "workspace_error" | "prompt_render_error" | "agent_startup_error" | "step_failed" | "step_timeout" | "agent_crashed" | "canceled";
export interface AttemptState {
    phase: AttemptPhase;
    step?: string;
    failure?: FailureCategory;
    failedStep?: string;
    error?: string;
}
export declare const ATTEMPT_TRANSITIONS: Readonly<Record<AttemptPhase, readonly AttemptPhase[]>>;
type TransitionContext = Partial<Omit<AttemptState, "phase">>;
export declare function transitionPhase(current: AttemptState | null, next: AttemptPhase, ctx: TransitionContext): AttemptState;
export {};