Title: SafeCoop: Unravelling Full Stack Safety in Agentic Cooperative Driving
Primary area: applications to robotics, autonomy, planning
Keywords: Agentic Collaborative Driving, Vehicle-to-everything, Autonomous Driving, V2X Communincation, Multi-model Large Language Model

Abstract: Collaborative driving systems leverage vehicle-to-everything (V2X) communication across multiple agents to enhance driving safety and efficiency. Traditional V2X systems take raw sensor data, neural features, or perception results as communication media, which face persistent challenges, including high bandwidth demands, semantic loss, and interoperability issues. Recent advances investigate natural language as a promising medium, which can provide semantic richness, decision-level reasoning, and human–machine interoperability at significantly lower bandwidth. Despite great promise, this paradigm shift also introduces new vulnerabilities within language communication, including message loss, hallucinations, semantic manipulation, and adversarial attack. In this work, we present the first systematic study of full-stack safety (and security) issues in natural-language-based collaborative driving. Specifically, we develop a comprehensive taxonomy of attack strategies, including connection disruption, relay/replay interference, content spoofing, and multi-connection forgery. To mitigate these risks, we introduce an agentic defense pipeline, which we call **SafeCoop**, that integrates a semantic firewall, language-perception consistency checks, and multi-source consensus, enabled by an agentic transformation function for cross-frame spatial alignment. We systematically evaluate SafeCoop in closed-loop CARLA simulation across 32 critical scenarios, achieving 69.15% driving score improvement under malicious attacks and up to 67.32% F1 score for malicious detection. This study provides guidance for advancing research on safe and trustworthy language-driven V2X collaboration in transportation. Our code is available at: [https://anonymous.4open.science/r/SafeCoop-4800](https://anonymous.4open.science/r/SafeCoop-4800)

TL;DR: We present SafeCoop, the first systematic study on attack and defense framework for agentic collaborative driving.