How Autonomous AI Agents Become Secure by Design With Docker Sandboxes

I've been running AI coding agents for a while now. Claude Code on my MacBook, pointed at a project directory, autonomously editing files, running tests, pushing commits. It's genuinely useful — the kind of useful that makes you wonder how you shipped code without it. But a few months ago I started asking myself a question I'd been quietly avoiding: what exactly can this agent reach while it's running? The answer, once I actually looked, was uncomfortable. Everything. It could r