/** CLOSED = normal, OPEN = cooldown, HALF_OPEN = probe in flight */
export type CircuitState = 'CLOSED' | 'OPEN' | 'HALF_OPEN';
/** Per‑provider circuit breaker state, stored in‑memory. */
export interface CircuitBreakerState {
    state: CircuitState;
    failureCount: number;
    cooldownUntil: number;
    probeScheduledAt: number;
}
/**
 * Structured error classification returned by classifyError().
 * Every provider error maps to one of 7 categories with explicit
 * retryability and cooldown semantics.
 */
export interface ClassifiedError {
    category: 'auth' | 'payment' | 'rate_limited' | 'timeout' | 'unavailable' | 'model_not_found' | 'bad_request' | 'unknown';
    retryable: boolean;
    retryAfter: number;
    cooldownMs: number;
    permanent: boolean;
}
/** Configurable limits for provider-level retry behaviour within a chain. */
export interface ProviderChainConfig {
    maxRetries?: number;
    backoffBaseMs?: number;
    failureThreshold?: number;
    cooldownMs?: number;
    probeEnabled?: boolean;
    requestTimeoutMs?: number;
}
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