The Rise and Potential of Large Language Model Based Agents: A Survey
Zhiheng XiWenxiang ChenXin GuoWei HeYiwen DingBoyang HongMing ZhangJunzhe WangSenjie JinEnyu Zhou
Presents a unified architectural framework consisting of brain, perception, and action modules for large language model-based agents while systematically examining their applications across single-agent, multi-agent, and human-collaborative environments.
Artificial intelligence research has long sought to build autonomous agents that perceive their environment, make decisions, and execute actions. Traditional agent development relied on specialized algorithms, reinforcement learning, or symbolic logic that excelled in narrow domains but lacked general adaptability and required immense training data. The recent rise of large language models (LLMs) presents a foundational opportunity to overcome these limits by providing broad general intelligence, reasoning, and natural language understanding out of the box.
The article systematically reviews the emerging field of LLM-based agents, establishing a conceptual foundation for how these models function as agent controllers and evaluating their real-world applications across individual, multi-agent, and societal frameworks. To do so, the authors synthesize extensive literature across cognitive science, software engineering, robotics, and multi-agent systems to map out core architectures, interaction paradigms, and operational environments.
The review outlines a unified architecture centered on three primary components: a central brain module powered by an LLM for memory, reasoning, planning, and knowledge retrieval; a perception module that translates multimodal inputs into actionable representations; and an action module expanding textual outputs into tool use and physical or virtual embodiment. In practical execution, single agents demonstrate strong task decomposition and lifelong learning in web, software, and simulated environments. When organized into multi-agent systems, agents engage in ordered or adversarial collaboration, dividing labor to achieve performance gains that exceed individual agent capabilities. Furthermore, interactions within simulated agent societies reveal emergent human-like social behaviors and cooperation patterns.
These findings suggest significant strategic value for organizations seeking to automate complex, multi-step workflows without developing task-specific models from scratch. Deploying LLM-based agents can substantially reduce labor costs, increase productivity in technical domains like software engineering and scientific research, and enable adaptive human-agent collaboration. However, the reliance on LLMs introduces operational and safety risks, such as unpredictable hallucinations, susceptibility to adversarial manipulation, and potential computational overhead in extended multi-agent deliberations.
To safely capitalize on this technology, decision-makers should pursue structured, human-in-the-loop deployments where human feedback guides and validates agent execution. Organizations should prioritize integrating specialized external tools and validation layers rather than relying entirely on unconstrained agent autonomy. Future development requires standardized evaluation benchmarks for utility, trustworthiness, and alignment, along with robust testing in controlled sandbox environments before deploying agents in mission-critical or physical settings.
While evidence strongly supports the versatility and rapid adaptability of LLM-based agents, confidence must be tempered by existing limitations. The literature relies heavily on simulated sandboxes and software tasks, leaving a gap in understanding physical real-world grounding and long-horizon stability. Stakeholders should therefore view these systems as powerful collaborative assistants rather than fully autonomous replacements for human oversight.
- Paper: ReAct: Synergizing Reasoning and Acting in Language Models, Shunyu Yao et al. (2023). It introduces the fundamental ReAct paradigm that unifies reasoning and acting, serving as a primary operational mechanism reviewed in the survey.
- Paper: Generative Agents: Interactive Simulacra of Human Behavior, Joon Sung Park et al. (2023). It provides the seminal architecture and empirical demonstration for simulating social behaviors and agent societies with LLMs that the survey extensively synthesizes.
- Paper: Reflexion: language agents with verbal reinforcement learning, Noah Shinn et al. (2023). It establishes verbal self-reflection and episodic memory updates as core mechanisms for autonomous error correction in language agents.
- Paper: AutoGen: Enabling Next-Gen LLM Applications via Multi-Agent Conversation, Qingyun Wu et al. (2023). It introduces a foundational multi-agent conversation framework that exemplifies the cooperative LLM agent architectures categorized in the survey.
- Paper: Improving Factuality and Reasoning in Language Models through Multiagent Debate, Yilun Du et al. (2023). It presents the multi-agent debate mechanism that forms a cornerstone of collaborative decision-making and factuality improvement in LLM agent systems.
- Paper: ToolLLM: Facilitating Large Language Models to Master 16000+ Real-world APIs, Yujia Qin et al. (2023). It details how language models can be equipped with neural retrievers and decision-tree planning to interact with massive real-world tool APIs.
- Paper: A Roadmap of Agent Research and Development, NICHOLAS R. JENNINGS et al. (2004). It outlines the foundational principles and historical taxonomy of autonomous and multi-agent systems that contextualize the modern shift toward LLM-based agents.
- Paper: On the Opportunities and Risks of Foundation Models, Rishi Bommasani et al. (2021). It establishes the foundational capabilities, emergent properties, and sociotechnical risks of large foundation models acting as general-purpose starting points.
- Paper: Agentic Reasoning for Large Language Models, Tianxin Wei et al. (2026). It provides a modernized, comprehensive survey that formalizes agentic reasoning across single-agent skills, self-evolution, and post-training reinforcement learning.
- Paper: Toward Efficient Agents: Memory, Tool learning, and Planning, Xiaofang Yang et al. (2026). It investigates computational and token efficiency across the core agent modules of memory, tool use, and planning introduced in earlier broad surveys.
- Paper: Code as Agent Harness, Xuying Ning et al. (2026). It expands the conceptual framework of agent action and environment modeling by framing executable code as the primary harness for persistent agentic execution.
- Paper: Towards a Science of Scaling Agent Systems, Yubin Kim et al. (2025). It extends the study of multi-agent collaboration by empirically formulating scaling principles and identifying coordination trade-offs across diverse task environments.
- Paper: Small Language Models are the Future of Agentic AI, Peter Belcak et al. (2025). It explores transitioning agentic architectures from resource-heavy frontier LLMs to modular, efficient small language models.
- Paper: AgentDoG: A Diagnostic Guardrail Framework for AI Agent Safety and Security, Dongrui Liu et al. (2026). It builds upon the safety and reliability challenges of autonomous agents by providing a diagnostic guardrail framework for multi-step trajectory monitoring.
- Paper: Memory is Reconstructed, Not Retrieved: Graph Memory for LLM Agents, Shuo Ji et al. (2026). It develops advanced graph-structured, iterative memory reconstruction to overcome the context and retrieval bottlenecks of LLM agents.
- Paper: Learning to Orchestrate Agents in Natural Language with the Conductor, Stefan Nielsen et al. (2026). It operationalizes multi-agent coordination by training a specialized orchestrator model to dynamically delegate subtasks in natural language.
