HOL Guard.

HOL Guard

HOL Guard is a real-time security layer that intercepts and blocks risky AI agent actions before they execute. It protects developers from prompt injection, malicious MCP servers, supply-chain attacks, and secret exfiltration by stopping dangerous reads, unauthorized installs, and config changes at the moment they occur.

Product Highlights

• Live Interception: Blocks risky AI actions in real-time before code execution, with instant alerts for threats like unauthorized file reads and MCP registrations
• Multi-Agent Support: Seamlessly integrates with popular AI coding agents including Cursor, with one-command installation and automatic harness configuration
• Zero-Friction Setup: Installs locally in 60 seconds with no credit card required, offering immediate protection without disrupting developer workflows
• Proactive Threat Intelligence: Delivers curated security advisories, interactive labs, and real attack breakdowns to keep teams ahead of emerging AI-specific threats
• Cross-Machine Sync: Pro tier enables receipt synchronization across devices and centralized management of Slack and email security alerts

Use Cases

• AI Coding Agent Protection: Developers using Cursor or other AI assistants can prevent prompt injection attacks and malicious tool executions while maintaining productivity
• CI/CD Security Validation: Plugin publishers and open-source maintainers scan extensions before release and enforce runtime security decisions across their ecosystems
• Enterprise Secret Exfiltration Prevention: Security teams block unauthorized attempts to read sensitive files like ~/.npmrc, API keys, and configuration credentials
• Supply-Chain Attack Defense: Organizations validate MCP servers and third-party tools before installation, stopping poisoned dependencies from entering their codebase

Target Audience

HOL Guard serves software developers, DevSecOps teams, and open-source maintainers who rely on AI coding agents but need enterprise-grade protection against the unique attack vectors these tools introduce. It's built for security-conscious engineers at startups and scale-ups who want proactive defense without sacrificing development velocity.