PromptGuard is a security skill for OpenClaw that scans every incoming message, tool output, and MCP response **before your agent acts on it**. If it detects an injection attempt, it blocks the message and alerts you.

What else should I install alongside it?

PromptGuard is one layer. For proper defence-in-depth, combine it with:

Is PromptGuard enough on its own?

No. It's a strong first layer, but:

Don't want to do this yourself?

Security configuration is where most people get it wrong. If you want PromptGuard, ACIP, SkillGuard, and the full 17-step hardening checklist applied to your OpenClaw installation — that's included in every setup.

How to Install PromptGuard on OpenClaw (Stop Prompt Injection in One Command)

PromptGuard is a free security skill that protects your OpenClaw agent from prompt injection, data exfiltration, and malicious skills. Install it with one command: clawhub install prompt-guard. It ships with 650+ detection patterns across 11 threat categories and works offline with no API required.