dedicated passbook feature. Remember passbook savings accounts, where the bank
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The type=local output is the most interesting for non-image use cases. Your build can produce compiled binaries, packages, documentation, or anything else, and BuildKit will dump the result to disk. No container image required.
The common pattern across all of these seems to be filesystem and network ACLs enforced by the OS, not a separate kernel or hardware boundary. A determined attacker who already has code execution on your machine could potentially bypass Seatbelt or Landlock restrictions through privilege escalation. But that is not the threat model. The threat is an AI agent that is mostly helpful but occasionally careless or confused, and you want guardrails that catch the common failure modes - reading credentials it should not see, making network calls it should not make, writing to paths outside the project.