# AgentGrad: Intervention-guided Prompt Optimization for Multi Agent Systems > Source: > Published: 2026-09-10 11:30:12+00:00 Large language model (LLM)-based multi-agent systems (MAS) achieve strong performance by employing specialized multiple agents, yet their performance depends on the prompt design of each agent. For MAS prompt optimization, textual gradient methods that guide prompt updates using natural-language fee