Get Alpha Harness for your computer.
The app is built and tested. What is left is code signing and Apple notarisation, which is what stops your machine warning you about an unidentified developer. Leave your email below and you get the link the day it is done.
The windows installer is not published yet — that button had nothing to give you, so it brought you here instead of failing silently. Email me when it is ready.
macOS
Apple Silicon (M1 and later). Open the .dmg, drag to Applications.
Windows
Windows 10 and 11, 64-bit. Unzip and run, nothing to install. Tells you when a new version is out.
Linux
One x86_64 file. Make it executable and run it on Ubuntu, Debian, Fedora or Arch.
What happens when you open it:
What each tool gets
Verified against each vendor's docs.
Dangerous commands are stopped before they run, risky file writes are stopped before they land, and your rules are added to every session automatically.
Same protection as Claude Code. Commands and file writes are both checked before they happen, and your rules file is trimmed to fit Gemini's size limit.
Same protection as Claude Code. Codex stops reading its rules file at a fixed size without warning you; Alpha Harness measures the file and refuses to write one that would be cut off.
Every terminal command the agent tries to run is inspected first and the dangerous ones refused, with the reason handed back so the model corrects itself.
Cannot: Cursor has no hook that runs before a file write, so a bad write is reported rather than prevented, and Cursor gives us no way to add your rules to a prompt.
Antigravity reads the same rules file as the Gemini CLI, so installing once covers both. One file, not two copies that drift apart.
Cannot: Google does not document whether Antigravity also runs the Gemini CLI's hooks, so we do not claim it.
Same protection as Claude Code. Hermes builds its own skills as it goes, so a guard that catches a bad command before it runs matters more here, not less.
Your conventions are added to Aider's own config so they load in every session. Existing settings in that file are merged, never replaced.
Cannot: Aider has no hook system, so nothing can be blocked.
No surprises
Exactly what it writes to your disk.
The whole list. Nothing else is created. Every file for a tool you do not have is skipped.
~/.claude/CLAUDE.mdYour rules, in a marked block. Anything you wrote yourself is left alone.~/.claude/settings.jsonMerged, never replaced. Your own hooks and settings stay exactly as they were.~/.cursor/hooks.jsonMerged. Registers the command guard with Cursor.~/.gemini/GEMINI.mdYour rules. Read by both the Gemini CLI and Antigravity.~/.codex/AGENTS.mdYour rules, size-checked so Codex cannot silently cut them off.~/.aider.conf.ymlMerged. Adds your conventions file to Aider's existing config.~/.freed/The law pack, the search index and the logs. Your notes live in your own vault folder, not here.See it before it happens, and undo it after.
The installer shows you this list and waits. From a terminal:
alphaharness install --dry-run # show every file, write nothing
alphaharness uninstall # put every file backUninstall removes our block from each file and leaves everything else untouched. Your notes are yours and are never deleted.