What is antivirus for AI agents?
Last updated 23 October 2026
AI coding agents such as Claude Code, Codex and Cursor run commands, read files and install tools on your computer. Antivirus for AI agents watches what they actually do and tells you when an agent stops working for you.
Why agents need their own protection
Classic antivirus looks for known malicious files. An AI agent is a trusted program you started yourself, so its actions look legitimate to the operating system even when they are not.
Agents read content written by other people: web pages, issues, pull requests, documentation, tool results from MCP servers and skills. Text in that content can carry hidden instructions (indirect prompt injection) that steer the agent towards something you never asked for, such as reading your keys or sending data out.
The risk is not only attacks. An agent can also drift off task, delete the wrong folder or switch itself to a mode that no longer asks you before acting.
What it watches
Each step an agent takes, compared with the task you gave it: on task, not part of the task, or looks like an attack.
The content an agent reads, so an instruction hidden in a page or tool result can be linked to the sensitive action that follows it.
The skills, plugins and MCP servers an agent can load, checked for malicious instructions before they run.
High-risk actions: credential and key access, secrets posted to pull requests, data exfiltration, persistence, disabling security tools, an agent changing its own settings, and supply-chain actions such as publishing packages or installing from unofficial registries.
How AgentWarden does it
- AgentWarden runs on your own Mac or Windows PC and analyses everything on the device. Your code, prompts and transcripts are never uploaded.
- Claude Code and Codex are read step by step from their own session logs and judged against what you asked. About thirty other agents and agentic IDEs are recognised running, with their commands, skills and settings checked.
- Decoys and tripwires (Pro) catch what rules miss: fake credential files that no legitimate task touches. A hijacked agent that asks for a real key by name can be handed the decoy instead.
- It watches by default. Containment, when on, acts only on a session judged to be hijacked, and never touches your own terminal, shell or remote access.
What it cannot do
No security tool catches everything. An action already running, or an agent without hook support, is detected rather than stopped. Rules can be evaded, which is why decoys and frequent signed rule updates exist. AgentWarden is personal-grade protection for the computer it runs on, not enterprise endpoint security. The full list is on the Limits page.
Questions
Is antivirus for AI agents the same as normal antivirus?
No. Normal antivirus looks for malicious files. Antivirus for AI agents watches trusted agents you started yourself and judges their actions against the task you gave them.
Does AgentWarden upload my code?
No. Everything is analysed on your device. Code, prompts and transcripts never leave your computer.
Which agents does it cover?
About 30, including Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, Windsurf and Kiro. Claude Code and Codex are checked step by step; the rest are recognised running, with commands, skills and settings checked.
AgentWarden is antivirus for AI agents for Mac and Windows. It watches Claude Code, Codex, Cursor and about thirty other agents on your own computer, everything analysed on the device. Free for one computer; Pro has a 14-day free trial. Get AgentWarden