/**
 * Guard against duplicate todo_write calls within a single user turn.
 *
 * - The first write after the per-turn lock is active is blocked and returns a
 *   paired TODO_WRITE_ALREADY_APPLIED rejection result.
 * - The second equivalent duplicate terminates the active agent run locally with
 *   REPEATED_TOOL_CALL_LOOP. The tool layer throws for this case.
 *
 * Counts reset on non-todo tool success or a new user message.
 */
export declare class TodoLoopGuard {
    private duplicateRejectionCount;
    /**
     * Record a todo_write attempt that was already rejected by the per-turn lock.
     * Returns whether the call may return a rejection result (first duplicate)
     * or must terminate the run (second equivalent duplicate).
     */
    recordDuplicate(): boolean;
    /**
     * Reset loop guard after a successful non-todo tool call.
     */
    resetOnNonTodoToolSuccess(_toolName: string): void;
    /**
     * Reset loop guard when a new user message arrives.
     */
    resetOnNewUserMessage(): void;
    /**
     * Reset loop guard manually.
     */
    reset(): void;
    getDuplicateRejectionCount(): number;
    isDuplicateLoop(): boolean;
}
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