The harness
for AI coding agents.
Alpha Harness sits between Claude Code, Codex, Cursor or Gemini CLI and your repo. It stops destructive commands before they run, loads your rules and notes into every session, and keeps your code on your machine.
Works with the tools you already pay for
- Claude Code
- Gemini CLI
- Codex
- Cursor
- Antigravity
- Hermes Agent
- Aider
- Droid
- Amp
- Pi
Why Alpha Harness
Four layers between your agent and your repo.
Each one runs on your machine, each one is tested, and each one tells you exactly what it did.
Guards
The command that wrecks a week never runs.
Everything your agent tries to do is checked on your machine first. The destructive ones are refused, with a reason the agent understands, so it takes the safe path instead.
- Force-pushes, mass deletes, overwritten secrets and schema pushes stop here.
- Normal work is untouched: status, tests and commits to your own branch pass.
- Careful mode holds commits, pushes and deploys for a human.
- Under 20 ms per check (p95, Apple M2 Max). Works offline.
git push origin main --force | Blocked | rewrites shared history |
rm -rf ./build | Blocked | deletes with no way back |
echo "API_KEY=x" > .env | Blocked | overwrites your secrets |
npx drizzle-kit push | Blocked | changes a live database |
git status | Allowed | |
npm test | Allowed | |
git commit -m "wip" | Allowed |
Memory
Your agents stop asking what you already decided.
What you settled last month comes back at the moment it matters, and only then. When nothing is relevant, nothing is added: no padding, no bill for noise.
- Uses the notes you already keep: Obsidian, Logseq, a plain folder. No notes yet? It starts a vault for you.
- Every project sees only its own notes.
- Secrets are filtered out before anything is remembered.
- Your notes and your code stay on your machine.
- “why do payouts fail on Base?”2 of your notes recalledPayout retries: what we decidedBase RPC limits
- “rename this variable”Nothing relevant. Nothing added.
Laws
One rulebook. Every tool follows it.
18 laws to start with — check before you claim, no destructive shortcuts, test before "done" — and room for your own. Each tool gets them where it actually reads them, and every copy stays identical.
- One install finds the tools you have.
- Your own text in those files is kept, never rewritten.
- A session that was already open picks the rules up on its next prompt.
- Uninstall removes exactly what was added.
| Claude Code | rules + guards |
| Codex | rules + guards |
| Gemini CLI | rules + guards |
| Hermes Agent | rules + guards |
| Cursor | rules + command guard |
| Antigravity | rules |
| Aider | rules |
Doctor
It checks itself, and fixes what is safe to fix.
Protection that quietly stopped working is worse than none. The Doctor tests every layer end to end on a schedule, repairs what is safe to repair, and shows you what it did.
- Repairs only touch its own files. Never your notes, never a tool's settings.
- Every repair is tested again before it is reported as fixed.
- Tells you when something else on the machine is getting in the way.
- One click to run it now, one click to copy the report.
- OKGuardsinstalled and answering
- OKRulesidentical in every tool
- FIXEDMemorysearch index rebuilt
- WARNMachineanother harness is also installed
Measured, not promised
Fast enough to forget.
Strict enough to trust.
Every check runs on your machine, in milliseconds. No server in the loop, so nothing waits on a network.
Measured 2026-10-02 on the shipped build. Method and history on the changelog.
Trust
Your code, your machine, your audit trail.
Your machine
Guards, memory and the Doctor run locally and keep working offline. Your code and your notes are never uploaded.
Your files
Rules are plain files on your disk. What we add is clearly marked, and your own text is never rewritten.
Your audit trail
Every block is logged with its rule. The Privacy screen prints the exact bytes of anything sent, and every part of it can be switched off.
Your exit
Uninstall removes every file and hook it added, in every tool, and says what it did.
Pricing
Free to start. One price, locked.
The first 100 customers keep this rate for as long as they stay. 30-day money-back guarantee.
- One workspace
- Every guardrail, none held back
- Memory that survives every session
- Your own AI key, or local models
- Anonymous usage data, switch off any time
Everything that protects your work is free and always will be. Paying adds workspaces and machines, not more safety.
- Unlimited workspaces
- Up to 3 of your own machines
- This price never increases. Ever.
- Direct line to the founders
Card, PayPal, Apple Pay, Google Pay. VAT at checkout. Bank transfer is invoiced by FREEDOM LABS LTD, usually the same day.
- Everything in Founding, for every seat
- One shared set of rules across the team
- Add and remove people yourself
- Up to 3 machines per person
- One invoice, one renewal date
Billed monthly, cancel any time. VAT at checkout. Bank transfer is invoiced by FREEDOM LABS LTD, usually the same day.
- Everything in Teams, at any size
- Volume pricing, the rate drops with scale
- Invoicing on your terms
- Rules managed centrally for every developer
- A named person to call
Tell us how many people and which tools they use. A number comes back the same day. Or email support@alphaharness.xyz.
30-day money-back guarantee · cancel any time · invoice and bank transfer available · refer someone, earn 30%
Questions
Before you install.
Does it slow my terminal down?
No. Each check is measured at 20 ms at the 95th percentile on an Apple M2 Max. You will not notice it.
Does my code leave my machine?
Never. Rules, notes and guards are files on your disk and work offline. Every plan sends anonymous usage data with no file names, prompts or commands in it, and you can switch any part of it off. Every switch is on the app's Privacy screen, next to the exact bytes.
Which AI coding tools does it support?
Claude Code, Gemini CLI, Codex, Cursor, Antigravity, Hermes Agent, Aider, Droid, Amp, Pi. The download page lists exactly what each one gets, and what it cannot do.
How do I undo it?
In the app: Settings → Uninstall. One click, and every file goes back the way it was. Your notes are never deleted.