/** Host integration boundary for just-in-time `x-oai-attestation` values. */
export type CodexAttestationProvider = () => Promise<string | undefined>;
/** Install the process-wide just-in-time Codex attestation provider. */
export declare function setCodexAttestationProvider(provider: CodexAttestationProvider | undefined): void;
/** Resolve an attestation only for ChatGPT-OAuth credentials. */
export declare function getCodexAttestationHeader(accountId: string | undefined): Promise<string | undefined>;