/** Hook command and matcher for one session. */
export interface DestructiveGitGuard {
    hookCommand: string;
    matcher: string;
}
/**
 * Whether the guard is on for sessions launched by this backend.
 *
 * @param env - Environment to read (defaults to the backend's process.env)
 * @returns false only when `CREWLY_DESTRUCTIVE_GIT_GUARD=0`
 */
export declare function isDestructiveGitGuardEnabled(env?: NodeJS.ProcessEnv): boolean;
/**
 * Prepare the guard for a session.
 *
 * @param installRoot - Install root holding `config/hooks`
 * @param env - Environment holding the kill switch
 * @returns The hook description, or null when disabled
 */
export declare function prepareDestructiveGitGuard(installRoot: string, env?: NodeJS.ProcessEnv): DestructiveGitGuard | null;
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