export type ModelAttemptPlan = {
    ok: true;
    timeoutMs: number;
    remainingMs: number;
} | {
    ok: false;
    reason: string;
};
export interface AgentRunSupervisorOptions {
    timeoutMs: number;
    deadlineAtMs?: number;
    parentSignal?: AbortSignal;
    minimumFallbackMs?: number;
}
/** Minimal run-level coordination: root cancellation and per-attempt deadline planning. */
export declare class AgentRunSupervisor {
    readonly deadlineAtMs: number;
    readonly signal: AbortSignal;
    private readonly controller;
    private readonly timeout;
    private readonly forwardParentAbort;
    private readonly timeoutMs;
    private readonly minimumFallbackMs;
    private readonly parentSignal?;
    constructor(options: AgentRunSupervisorOptions);
    planModelAttempt(isFallback: boolean): ModelAttemptPlan;
    dispose(): void;
}