Your Mac,
by voice.

Wake01O OListening

Wakes on a word.
Touch ID opens it.

Asleep it listens on-device for one word. Nothing billed. Then Touch ID, Apple Watch, the Mac password or a passphrase.

• Three misses lock the gate for a minute.
• Speaker verification is not attempted.
• Say stop. It stops mid-sentence.

Say02- -Thinking

Codex, Claude Code, a key,
or a model on this Mac.

Unambiguous commands reach the hands in milliseconds. The rest goes to the brain. You pick the brain in Settings.

• "Click Save" runs. The brain is told after.3 ms
• Same tools and policy for every brain.71 tools
• A local brain keeps memory on the Mac.this Mac

Threads03o oActing

Several things at once.
Each with its own brain.

Each has its own brain, conversation, budget and blob. Up to three run beside the main one.

JarheadWed 24 Sep 12:37

Hands04> >Acting

Label first. Click second.
Screenshot last.

The hands are a Swift helper with 71 tools in ten families. They find a control by label and click it. A screenshot only verifies.

• Circle anything with ⌥⇧C. Every brain sees it.
• The blob moves to where the hands act.
• The Console lists every coding-agent session.

Rails05^ ^Speaking

One policy table.
Run, confirm or refuse.

Every call is run, confirm or refuse. The reason is spoken. No tool is special-cased.

• A spoken yes covers one action once.
• Your key or click holds it 1.5 s.
• On-screen text is never an instruction.

Sleep06- -Asleep

Say good night.
Alarms still ring.

It says "night." and closes the session. Ten idle minutes do the same. Alarms, timers, watchers and routines fire while it sleeps.

• No session, no brain turn, nothing billed.$0
• Set-up asks once. Fire time never asks.
• Nothing fires while Jarhead is quit.

Numbersthe ledger

Measured on one Mac.
Written down.

Measured on the author's Mac and written down. The harnesses are in the repo. Every latency carries its n and date.

• 126 msprefire partials, p95
• 457 mscareful partials, p95
• 1.11 sGPT-Live-1 reply, median
• 4.4 sdelegation to first visible action, median
• 8.9 sdelegation to verified completion, median
• 55 mstool round trip, median
• 48 to 75 msscreenshot, warm full display
• 10.7kinput tokens, cold Codex thread
• 71tools in ten families
• 3live threads beside the main one
• 1.5 syour key, click or scroll holds the hands
• 2 sliveness ping
• 90 sdaemon linger after a crash
• 10 minidle sleep

Costswhat it bills

Five cents a minute.
Asleep costs nothing.

The voice bills $0.05 a minute. It counts per second. Pause and Stop close the session.

• Codex runs on your ChatGPT plan.
• A local brain bills nothing. The voice does.
• The Ledger tab totals each day.

Madehow it is made

Swift in the app.
TypeScript in the daemon.

• Jarhead.app is Swift.
• The daemon jarheadd is TypeScript.
• Two Swift helpers act on the Mac.
• The ledger is append-only. Nothing is deleted.
• Its self-edits apply only on your yes.

Installsource only

Four commands.
Then say jarhead.

One line clones the repo and runs four commands. Setup opens on first launch and writes your key.

It never writes your keys. Read it first at https://jarhead.kevinliu.studio/install.sh

• Keys go into ~/.jarhead/env at mode 0600.
• Sixteen permissions in one sweep. Seven required.
• pnpm run doctor checks keys, brain and permissions.

Setup7

• Welcome
• Voice
• Brain
• Permissions
• Wake
• Agents
• Done