Guardrails for
Intelligent Agents.

Minimize token usage, incidents and AI psychosis by richer context, better guardrails and stronger observability for Agents.

Download Crane How it works

.crane/policies/payments.crane

policy payments {
  preserve K7M2P9RX;✕ denied
  target   4QZ8M2LD
           change_type logical_bn;✓ passed
}

K7M2P9RX · context
"Fees are audited; keep the rate."

app/payments.py

1# @crane:selection:K7M2P9RX:start

2def fee(amount):

3 return amount * 0.03

4# @crane:selection:K7M2P9RX:end

6# @crane:selection:4QZ8M2LD:start

7def refund(order):

8 return order.total

9# @crane:selection:4QZ8M2LD:end

Claude

✕ Denied by Crane · preserve K7M2P9RX Context: Fees are audited; keep the rate.

Works with

Claude CodeCodexGitHub Copilot CLIGemini CLIVS CodeGitHub Actions

What is Crane

A prompt is not a rule. A contract is.

Agents edit faster than anyone can review. Crane turns what may change into signed contracts and enforces them where the agent acts.

Preserve and target

Lines an agent must not touch, and lines it must change. Markers move with the code.

Checked before it runs

Every tool call is decided in the agent's hooks. Shell bypasses are caught after.

Signed evidence

Hash-chained records show what each agent did, what was denied, and why.

Product

One rulebook, three ways in.

CLI

The rules and the referee

One binary creates signed contracts, tests them, and enforces them in the agent's hooks.

policy payments {

preserve K7M2P9RX;

target 4QZ8M2LD;

}

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Extension

Governance in the editor

Select code and press Ctrl Alt F. Zones, flows, and selections as a live graph.

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Every teammate's agents, one view

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Install

Then, in your repository

crane repo --https https://github.com/OWNER/REPO
crane init
crane checkpoint baseline
crane agent install --profile claude

Checksums and the extension's .vsix are on the release page.

Reference

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Guardrails for Intelligent Agents.