Hi r/ClaudeAI,

I built a free and open-source tool called **aigate**. It is an OS-level sandbox designed specifically to secure AI agents like Claude Code when running on your local machine.

**What it does:** When using Claude Code, relying on application-level permissions like `.claudeignore` can be risky if the model hallucinates or ignores system prompts. `aigate` fixes this by acting like a Python `venv` for AI permissions. It uses the OS kernel (Linux namespaces, POSIX/macOS ACLs, and cgroups v2) to physically prevent Claude from reading your secrets (like `.env` or `~/.ssh`) or executing dangerous commands (`curl`, `wget`, `ssh`).

I used Claude (Sonnet) to help write the Go architecture for this project. Specifically, I used Claude to map out the complex Linux system calls required for process isolation. Claude was instrumental in generating the Go code for the Linux `unshare` syscalls (for Mount and Network namespaces) and helped me correctly configure the cgroups v2 resource limits, saving me hours of digging through Linux kernel documentation.

**How to try it (It's 100% Free):** The project is completely free, open-source (MIT License), and runs natively on macOS, Linux, and WSL.

You simply define your rules once:

    aigate deny read .env secrets/ *.pem
    aigate deny exec curl wget ssh

And then run Claude Code safely inside the boundary:

    aigate run -- claude

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