Best Self-Hosted AI Agent Security in 2026

Tools that protect AI agents, their tools, MCP servers, plugins, and package installs from prompt injection, secret exposure, unsafe commands, and supply-chain attacks at runtime.

The top-rated pick is HOL Guard with 934 GitHub stars.

1 self-hosted ai agent security — ranked by GitHub stars.Browse all

HOL Guard

Local-first antivirus for AI agents that blocks risky commands, secret access, prompt injection, malicious packages, and MCP threats at runtime.

Alternative to:

HiddenLayer

AI-assisted

Why self-host?

Self-hosting puts you in control. You own your data, avoid vendor lock-in, and eliminate recurring subscription costs. For teams handling sensitive data or operating under strict compliance requirements, running your own infrastructure is often the only viable option.