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> What's stopping your agent from overwriting an arbitrary source file (e.g. index.js) with arbitrary code and running it?

You're absolutely right :)

And even if it could be sandboxed at the source code level, what's to prevent a nefarious AI from writing an executable file directly as bytes that calls (e.g.) `unlink`?

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nah inspects Write and Edit content before it hits disk so destructive patterns like os.unlink, rm -rf, shell injection get flagged. And executing the result (./evil) classifies as unknown resolves to ask, which the LLM can choose to blocks or ask you to approve.

But yeah, a truly adversarial agent needs a sandbox. It's a different threat model - nah is meant to catch the trusted but mistake-prone coding CLI, not a hostile agent.

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