/**
 * Antigravity Provider Detector
 *
 * Detects Antigravity-specific errors and provider keys.
 */
/**
 * Check if provider key belongs to Antigravity family
 */
export declare function isAntigravityProviderKey(providerKey: string | undefined): boolean;
/**
 * Detect Google account verification required error (403 with specific messages)
 */
export declare function isGoogleAccountVerificationRequiredError(err: unknown): boolean;
/**
 * Detect Antigravity reauth required 403 (OAuth token expired/invalid)
 */
export declare function isAntigravityReauthRequired403(err: unknown): boolean;
/**
 * Extract retry error signature for Antigravity tracking
 */
export declare function extractRetryErrorSignature(err: unknown): string;
/**
 * Determine if should rotate Antigravity alias on retry
 * Safety: do not rotate between Antigravity aliases within a single request
 */
export declare function shouldRotateAntigravityAliasOnRetry(_error?: unknown): boolean;
/**
 * Inject Antigravity retry signal into metadata
 */
export declare function injectAntigravityRetrySignal(metadata: Record<string, unknown>, signal: {
    signature: string;
    consecutive: number;
    avoidAllOnRetry?: boolean;
} | null): void;