export declare function errorMessage(err: unknown): string;
export declare class AbortError extends Error {
    constructor(message?: string);
}
export declare class TimeoutError extends Error {
    readonly timeoutMs: number;
    constructor(message: string, timeoutMs: number);
}
export declare class IdleWatchdogError extends TimeoutError {
    constructor(message: string, idleTimeoutMs: number);
}
export declare class HookBlockedError extends Error {
    readonly event: string;
    readonly reason?: string | undefined;
    readonly cause?: unknown;
    constructor(message: string, event: string, reason?: string | undefined, options?: {
        cause?: unknown;
        injectContext?: string;
    });
    injectContext?: string;
}
export declare class StreamIncompleteError extends Error {
    toolResultsGathered?: number;
    constructor(message: string);
}
export declare class BudgetExceededError extends Error {
    readonly runningCostUsd: number;
    readonly maxBudgetUsd: number;
    constructor(runningCostUsd: number, maxBudgetUsd: number, message?: string);
}
export declare class DenialCircuitBreakerError extends Error {
    constructor(message: string);
}
export declare class UnsupportedProviderConfigError extends Error {
    readonly provider: string;
    readonly field: string;
    constructor(provider: string, field: string, message?: string);
}