This paper provides a tutorial and survey of LLM-based agents for automated vulnerability discovery and penetration testing. The rapid advancements in Large Language Models (LLMs) have opened new possibilities for their application in cybersecurity. Unlike traditional tools, LLMs can process natural language, retain context, and perform structured reasoning, enabling automation of complex security workflows. By equipping these models with memory mechanisms and tool-use interfaces, researchers have developed LLM-driven autonomous agents capable of performing specialized tasks such as web application testing, source code auditing, fuzzing, and network security assessment. Multi-agent architectures have emerged in which agents assume specialized roles (e.g., distinct penetration-test phases or exploit types). In addition to surveying existing applications, this work provides a step-by-step walkthrough of integrating agentic AI into penetration testing workflows. The walkthrough explores four phases: (I) mission scoping and prompt engineering for test definition and constraint enforcement, (II) autonomous exploration and tool selection for target interaction, (III) vulnerability hypothesis formation and verification through experiment design and feedback, and (IV) payload generation and refinement to transform validated findings into concrete exploits. The survey synthesizes 155 cited sources (2022–early 2026) using explicit inclusion/exclusion criteria, with coverage extending to reasoning-class models, the Model Context Protocol ecosystem, autonomous bug-bounty agents, and standardized agentic security benchmarks. Despite progress, challenges persist, such as model hallucination, context limitations, operating costs, and ethical concerns. Future directions include advancements in multi-agent collaboration, mechanisms for agent self-improvement, and improved transparency into agent behavior.
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