/**
 * Thrown when a vat-generated prompt (executor or grader) violates one of its
 * required invariants — a missing required directive, or the presence of a
 * forbidden phrase (e.g. an executor "blinding breaker").
 *
 * Shared across the `*-prompt.ts` modules in `skill-test/` so
 * `exit-codes.ts`'s `mapErrorToExitCode` maps all of them to the same
 * user-correctable preflight exit code (2), regardless of which prompt
 * builder raised it.
 */
export declare class PromptInvariantError extends Error {
    constructor(message: string);
}
/**
 * Append the per-run integrity-nonce directive to the grader prompt. The recipient must copy
 * `nonce` verbatim into the artifact it writes, as a top-level `runNonce`
 * field; the harness then rejects any artifact whose nonce is absent or wrong.
 * This is defense-in-depth against untrusted skill code forging a passing
 * result in the shared sandbox — without the secret nonce (delivered only via
 * stdin, never written to disk) a forged result cannot be authenticated.
 *
 * Appended AFTER any prompt-invariant assertion and AFTER any user prompt
 * override, so the nonce requirement is ALWAYS enforced and a committed
 * config cannot opt out of it.
 */
export declare function appendIntegrityNonceDirective(prompt: string, nonce: string): string;
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