Lightweight zsh and bash one-liners generated locally on machines with as little as 6 GB of unified memory. The whole sequence below stays on the Mac.
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Apple Silicon Mac, macOS 15 or later, and for how to draft shell scripts with the nano tier the unified-memory minimum that the chosen tier requires (6 GB for Nano, 12 GB for Lite, 16 GB for Quick (24 GB to run it fully in memory), 24 GB for Core and Vision 3.8, 64 GB for Plus). For draft shell scripts with the nano tier, those are the minimums to load a tier; a long agent session needs more. You need the internet to download each model (and once to activate a Pro key); after that, chat works offline.
The Nano tier is 2.37 GB on disk and runs at 71.7 tok/s on the M1 Ultra reference, with an operator-reported ~32 tok/s on a 16 GB M4 Air (single-prompt observation, not yet σ-qualified).
Check a generated script before you run it. zsh -n script.zsh (or bash -n script.sh) parses the file without executing anything, so a syntax slip shows up first. Then read every line that deletes, overwrites or escalates (rm, mv, sudo, a redirect into an existing file) twice, and run the script once against a copy of the folder it will touch.
Hosted shell-script tools are usually overkill for a 4B-class job. Nano on a 16 GB Mac handles this turn-by-turn at roughly 32 tok/s.
This guide does not claim feature parity with cloud-side workflows for “how to draft shell scripts with the nano tier”. Specifically, the product surface covers chat, file attachment, the local agent loop, project scoping, and the model picker. Cross-device sync, team workspaces, and shared session history are out of scope and are not on the v1.9 backlog either.
Operator-reported observation: roughly 32 tok/s on a 16 GB M4 Air, 2026-05-04, single-prompt single-turn. This is not yet a σ-qualified number and does not appear in the published benchmark set; treat it as indicative, not as a promise. The M1 Ultra reference is 71.7 tok/s on the same model.
Nano’s context (8K on Free, 32K on Pro) is enough for shell-script generation. The 6 GB unified-memory minimum means even an entry-level M1 Air handles this; the M4 Air is comfortable headroom.
4 steps. Once the model is downloaded your chats and files stay on your Mac. Nano is not a code-tier; for shell scripts and small zsh utilities its fluency is enough, but for full programs the Lite or Core tier is the right choice.
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