/**
 * LoopGuard — Anti-loop circuit breaker for an agent loop.
 *
 * Hermes-inspired: tracks the last N tool calls per run and injects a
 * corrective system instruction if the same tool is called with identical
 * arguments more than `threshold` times in a row.
 *
 * Usage:
 *   const guard = new LoopGuard();
 *   // inside onStepFinish:
 *   const warning = guard.check(toolName, JSON.stringify(args));
 *   if (warning) { / inject into messages or tool output / }
 */
export declare class LoopGuard {
    private history;
    private readonly threshold;
    constructor(threshold?: number);
    /**
     * Check whether the agent is stuck in a loop.
     * Returns a warning string to inject if stuck, or null if clean.
     * Resets the history window after a loop is detected.
     */
    check(toolName: string, toolInput: string): string | null;
    /** Reset state between logical tasks. */
    reset(): void;
}
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