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The Standalone form is a single binary with the whole system inside — it is a coding agent. Nothing else to install. It’s proprietary, and it runs on macOS (Apple Silicon or Intel) and Linux (arm64 or x64).
1

Pick a flavour — it decides your command name

Two binaries. Whichever you choose is the command you run for every step below.
Gives you the mutagent-helix command.
Don’t pipe a script you haven’t read straight into a shell. Download it first, look at it, then run it:
Opt out of the PATH edit with --no-modify-path and add ~/.mutagent/bin yourself.
2

Reload your shell

The installer places the binary in ~/.mutagent/bin and adds that to your shell’s startup file (it prints which one). Reload it, or just open a new terminal.
3

Verify

--strict is the real check. (The installer already runs a branded verify for you.)
4

Launch

Helix launches straight into its dashboard.

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Update

Re-run the same installer command. It replaces the binary after verifying its checksum.

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Remove it

Add --purge to also drop the cached runtime.

Next: your first loop

Run a spec → build → evaluate pass end to end.