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macOS containment for AI coding agents and risky shell tasks: separate UID, Seatbelt sandboxing, PF anchors, DNS blocklists, backup/rollback. TLA+-checked design.
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Adding hazmat under For Developers.
hazmat is a macOS CLI that contains AI/coding agents and risky shell tasks. The agent runs under its own UID (not the operator's), under a Seatbelt policy applied via
sandbox_init()from a small privileged helper (notsandbox-exec), with PF anchors and DNS blocklists for per-session network policy, plus backup/rollback for reversible host setup.Particularly useful for developers running coding agents (Claude Code, Codex, etc.) where generated shell commands would otherwise execute with full user authority.
https://github.com/dredozubov/hazmat