Best AI Agent Security Tools 2026: Agentic AI Security Compared

Noma launched Agent Access Control on June 2, 2026. It builds a live registry of agents, MCP servers, skills and tools, ties policies to identity provider users and groups, and enforces tool-level and action-level rules, so access to a tool need not mean access to every operation it offers. AI-DR watches each agent session and detects prompt injection (including indirect injection through tool responses), tool poisoning, scope violations and agents drifting from their baseline. It can block an action, mask data, steer the agent, route the action to a human or trigger a killswitch. Enforcement runs through agent hooks, AI and MCP gateways, EDR or MDM tools, and direct APIs, and Noma covers SaaS agents, endpoint agents and agents built in-house. No public prices.

Zenity covers SaaS agents (Microsoft 365 Copilot, Copilot Studio, ChatGPT Enterprise, Claude Enterprise, Salesforce Agentforce and ServiceNow), homegrown agents on Amazon Bedrock, Google Vertex AI and Microsoft Foundry, and coding agents such as Cursor, Claude Code, Codex and GitHub Copilot, which it watches through native agent hooks and OpenTelemetry. Runtime Boundaries checks each agent action before it runs and allows it, blocks it or shuts the agent down; Zenity says about a third of its built-in rules catch multi-step chains such as data exfiltration or privilege escalation. Agentic Identity ties rules to the identity behind the agent in Okta or Microsoft Entra ID, for example stopping an agent whose owner has been deactivated. Its MCP gateway allows, modifies or blocks tool calls and flags tool poisoning, rug pulls and shadow or over-scoped servers. AIDR detects direct and indirect prompt injection, tool misuse and memory poisoning. Zenity raised a $125 million Series C led by Norwest in August 2026. It shows no prices on its site; its AWS Marketplace listing for AWS Security Hub Extended is usage-based, at $130 per resource a month for observability and $16 per million tokens a month for runtime protection.

Lasso discovers and inventories agents, profiling each by model, system prompt, tools and guardrails, and scores MCP servers, APIs and external connections by their permissions and actions. Lasso says its policies are intent-aware: they look at what an agent is trying to do, not only at its inputs and outputs. Role-based permissions and data loss prevention rules are enforced at runtime. Guardrails run inline at the proxy, API or AI gateway layer, with blocking in under 50 ms by Lasso's account, and detect indirect prompt injection across MCP tool calls. Its agent page names Vertex AI, Microsoft Copilot, AWS Bedrock and Salesforce Agentforce as well as custom agents, deployed through a gateway, API or SDK. No public prices.

Cisco AI Defense's AI Inventory discovers MCP servers and agent processes across cloud environments, and its supply chain module scans MCP servers, model files and repositories and scores each asset. At runtime it enforces allowlists and blocklists for MCP tools and detects agent threats including memory poisoning, tool misuse, privilege escalation, intent hijacking and deceptive agent behavior (data sheet updated October 26, 2026). On February 10, 2026 Cisco announced an AI BOM, an MCP Catalog of servers and registries, multi-turn red teaming for agents and real-time agentic guardrails, and said some of these products were still in development. No public prices.

Prisma AIRS has two agent-specific parts. Agent Identity Security gathers active agent deployments in one place with clear ownership, and verifies agent identities against impersonation and stolen-token reuse. Agentic Endpoint Security governs autonomous agents on endpoints. AI Runtime Security protects apps and agents in real time, blocking prompt injection, malicious URLs and poisoned content and securing interactions between apps, models, users, agents, plugins and external systems. The same platform includes an AI Gateway, red teaming and model scanning. Its pages show no prices.

WitnessAI launched Agentic Control on June 17, 2026 and made it available to all customers. It discovers agents and the MCP servers, tools and systems each one reaches, scores known MCP tools against OWASP and CVE risk classes in an MCP Catalog, and enforces one organization-wide allow list of MCP servers and tools. Every blocked tool call records the user, agent, tool and rule, and agent-to-agent activity stays tied to the person who started it. Guardrails block prompt injection and jailbreaks; WitnessAI reports a 99.3% true positive rate on its own benchmark. Discovery runs at the network, with REST APIs for custom agents. On AWS Marketplace, Agentic Visibility costs $24 per agent for 12 months with a 2,500-agent minimum.

Pillar's Agentic Endpoint finds coding agents, MCP servers, skills and plugins on each developer machine, audits agent settings such as permission rules, sandbox modes and hooks, and scores MCP servers against a catalog of 23,000+ analyzed servers. Its Runtime Guardian sits in the pre-tool hook of Claude Code, Codex CLI and Cursor and checks actions before they run; full configuration scans also cover Gemini CLI, OpenCode and Pi. Pillar's runtime guardrails track tool invocations, flag agents that drift from their business role, stop malicious instructions in user or retrieved content, and deploy in your VPC. No public prices.

Knostic's Kirin checks every coding-agent tool call against policy before it runs, and blocks dangerous commands, downgrades them or routes them to a human. It names Cursor, Claude Code, GitHub Copilot, Windsurf, Codex, JetBrains, Devin Desktop and Gemini CLI, plus Claude Cowork through a plugin. Its AgentMesh catalog scans skills, MCP servers and VS Code extensions and labels each dangerous, risky or clean. Prices are public: Kirin is free for 1 to 5 users, the Team plan is $15 per user a month with a 14-day trial, and Enterprise is quoted. Browsing AgentMesh is free, and paid AgentMesh plans include Kirin.