From Foundations to Autonomous Ecosystems: A Comprehensive Survey of Agentic AI Architectures, Protocols, Socio-Technical Dynamics, and Future Trajectories

The emergence of Agentic AI represents a transformative milestone in the trajectory of artificial intelligence, redefining computational systems from passive responders to proactive, autonomous collaborators. As demonstrated throughout this comprehensive survey, agentic capabilities are not an incidental extension of scaling model size; rather, they arise from the architectural synthesis of large-scale neural representations with structured cognitive components—encompassing persistent memory hierarchies, interleaved reasoning-acting frameworks, dynamic tool integration, and multi-agent coordination protocols. By establishing a dual-paradigm taxonomy, this work has decoupled the historical contributions of symbolic architectures from the stochastic mechanics of neural orchestration, resolving the pervasive challenge of conceptual retrofitting. Empirical case studies across automated software engineering, 6G communication networks, healthcare, and physical robotics confirm that multi-agent systems can achieve remarkable operational efficiencies, yet they simultaneously introduce severe vulnerabilities spanning prompt injection, memory poisoning, coordination failures, and the lethal trifecta of unauthorized tool use. Addressing these systemic risks demands an equally sophisticated assurance stack: transitioning from outcome-based benchmarking to rigorous process-level evaluation, implementing defense-in-depth security across the agent lifecycle, and establishing multi-tier release gating. Moving forward, realizing the full potential of Agentic AI will depend on our ability to navigate the tension between autonomy and controllability. By embracing neuro-symbolic convergence, green computing economics, and robust socio-technical governance, the scientific community can guide the evolution of Agentic AI toward safe, auditable, and beneficial intelligence that fundamentally augments human capability across the global technological ecosystem.

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