/**
 * Version advertised in the User-Agent product token. Tracks the highest
 * `minimal_client_version` in the upstream model catalog (gpt-5.6 tiers);
 * override with CODEX_AUTH_CLIENT_VERSION if the backend gate moves before a
 * plugin release does.
 */
export declare const DEFAULT_CODEX_CLIENT_VERSION = "0.144.0";
/**
 * Versions live in the UA product token (`name/version`), where a space would
 * split the token and break the backend's version parse. Keep only characters
 * that are safe in a product-token version; an empty result falls back to the
 * caller's default.
 */
export declare function sanitizeVersionToken(value: string): string;
export declare function buildCodexUserAgent(): string;
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