/**
 * Shared model/provider failure classification.
 *
 * Workflows, subagents, and the main chat all need the same decision about
 * whether a provider failure may spend another model candidate. Keep this
 * module free of AgentSession and workflow imports so the published SDK can
 * expose it to the raw-TypeScript companion packages without a cycle.
 */
export type ModelFallbackFailureKind = "auth_on_candidate_provider" | "rate_limit" | "provider_unavailable" | "network_timeout" | "transport_error" | "model_unavailable" | "request_incompatible" | "cancelled" | "task_failure" | "unknown";
export type ModelFallbackFailureSource = "assistant_message" | "diagnostic" | "throw" | "structured" | "string_fallback";
export interface ModelFallbackFailureSignal {
    readonly kind: ModelFallbackFailureKind;
    readonly message: string;
    readonly source: ModelFallbackFailureSource;
    readonly stopReason?: string;
    readonly status?: number;
    readonly code?: string | number;
    readonly name?: string;
}
export declare function errorMessage(error: unknown): string;
/** Alias used by the subagent package's older public helper name. */
export declare const modelFailureMessage: typeof errorMessage;
export declare function normalizeModelFailureSignal(error: unknown): ModelFallbackFailureSignal;
/** Whether a task-failure signal is a provider safety/refusal response. */
export declare function isSafetyRefusalFailure(error: unknown): boolean;
/** True when this failure may spend a configured model fallback candidate. */
export declare function isRetryableModelFailure(error: unknown): boolean;
/** True when the same model may be requested again before fallback advances. */
export declare function isRetryableSameModelFailure(error: unknown): boolean;
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