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Your agent writes and runs code against user data. Design the sandbox.

The model is an untrusted code author with an unlimited imagination, and prompt injection means it can be *aimed*. Strong answers pick an isolation primitive deliberately, then close the channel most designs leave wide open: the data the code is allowed to touch.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

The model is an untrusted code author with an unlimited imagination, and prompt injection means it can be *aimed*. Strong answers pick an isolation primitive deliberately, then close the channel most designs leave wide open: the data the code is allowed to touch.

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