Idle is not done.
Fleet turns one Claude Code session into a Captain that launches workers, verifies their work, and refuses to call a turn complete until the proof gate passes.
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$0 per token, no API key — runs on your Max plan. Or take the 4-line terminal path below.
One Captain, many hands.
One Claude Code session becomes the ⚓︎ Fleet Captain — it launches, steers, and monitors a fleet of worker sessions, each in its own cmux pane. You give the Captain an objective. The Captain runs the fleet — no hidden processes, no dashboard pretending to be a terminal.
Every worker is a pane you can read, address, and take the helm of. The fleet scales; the babysitting doesn't.
↑ Exhibit 01 — the deck above, in plain sight: four workers underway under one Captain.
$ fleet grid # launch many hands at once
Idle is not done.
A worker going quiet proves nothing. Fleet tracks every worker's state and holds the turn open until there is evidence of work — a test that passes, a file that exists. Idle is a status, not a result.
$ fleet verify # evidence, not silence
Judge ≠ generator.
Don't trust a worker's "done" — a turn is complete only when the proof gate passes. Verification runs in a separate session from the one that did the work; a generator never grades its own output. An inconclusive verdict is a failing verdict — the gate fails closed.
- judge ≠ generatora worker never grades its own work; verification is a separate session.
- fail closedinconclusive = FAIL. The gate never gives the benefit of the doubt.
- checkable proof"complete" requires a test that passes or a file that exists — a note is metadata, not proof.
$ fleet watch # keep the watch; let the gate decide
Write loops, not keystrokes.
“My job is to write loops.”
— Boris Cherny, on Acquired
Fleet is the loop made operational: spawn the hands, keep the watch, gate the proof, repeat. Five verbs are the whole vocabulary.
Launch a worker in its own cmux pane.
Fan out a grid of workers at once.
Monitor every worker's state, live.
Independent proof gate. Judge ≠ generator.
Check the install end to end.
$ fleet help # every verb above is real — check
Zero to Captain — four steps.
Clone, install, check, command. If step three doesn't print green checks, stop — fleet doctor is the contract, and Exhibit 00 is what passing looks like.
git clone https://github.com/dfeirstein/fleet.gitcd fleet && ./install.shfleet doctorfleet captain$0 per token, no API key — runs on your Max plan.
Or skip the terminal: type "clone fleet and launch my captain" into Claude Code.
Step 3 should end in green checks. If it doesn't, the install is not done — same rule we hold the workers to.
⚓︎ End of orders
The argument is over. The proof gate is waiting.
Open source. One sentence to install. The fleet takes the watch from there.
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