I've written 100+ articles about AI agent sandboxing. Here's what I've learned.
Lesson 1: Prompts aren't security
The #1 mistake people make is writing long system prompts full of rules:
- "Don't touch .env"
- "Don't delete files"
- "Ask before making changes"
These are suggestions, not security boundaries. The model will eventually ignore one.
Lesson 2: VMs are overkill
The #1 "standard advice" is "use a VM." That's terrible advice for most people.
30 seconds to boot. 2-4 GB of RAM. Networking setup. File sharing setup. Tooling installation.
You don't need Fort Knox to keep your files safe from a confused AI.
Lesson 3: Drive letters are the answer
The simplest, fastest, most reliable way to sandbox an AI agent is to give it its own drive letter.
Create a folder, map it to a drive on Windows, point the agent at that drive. That's it.
OS-level boundary. 10 seconds to set up. No overhead.
Lesson 4: The tool matters
The built-in subst command works, but mappings disappear when you reboot. I use ScsSubst (https://subst.scsoi.com/) to make them persistent. $9.99 lifetime, one-time purchase.
Lesson 5: Trust is the real ROI
Giving the agent its own drive didn't just make it safer. It made me trust it more.
And when you trust the agent more, you get more done. That's the real ROI.
The bottom line
AI agent sandboxing doesn't have to be complicated. It's just a drive letter.
Spend 10 seconds setting it up. Save yourself hours of cleanup later.
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