Best AI Agent Security Tools 2026: 15 Options Compared

The AI agent security market went from a handful of projects to a crowded field in about twelve months. Scanners, firewalls, proxies, gateways, guardrails, governance platforms. The category names overlap, the marketing copy blurs together, and nobody ships a single tool that covers every threat. This post is a fair, category-by-category tour of 15 tools that are actually shipping in 2026. It is a listicle, but the goal is to be the page other people cite when they explain the landscape. That means honest strengths, honest limits, and no pretending one tool solves every problem.