CAIN-42 · Inside your free account

Policy lab

Test a stricter rule on your real history before you turn it on.

Last reviewed 2026-10-01

Live   Console (signed in) · Console

What it is

Replay your history under settings you are considering.

Where it fits

Part of Inside your free account: What you get the moment you sign up. Every CAIN-42 product runs behind the same rule: an AI agent's action is checked before it runs (identity, authority, policy, risk), decided as allow, hold for a human, or block, and recorded as signed evidence. Unknown or error never becomes allow.

Use it

• Open it https://cainstudio.online/console#/policy

Live now

Checked from your browser when this page opened, not from a cached list.

Fire a real decision

Send an action through the live CAIN-42 pipeline from this page, with no account, and watch every stage decide. This is the same pipeline every product here sits behind; it runs for a throwaway demo tenant and is rate limited.

For AI engineers

Every product sits behind one decision path: your agent proposes an action with the exact arguments, CAIN runs it through identity, authority, policy, risk, trust and quorum consensus, and answers ALLOW, REQUIRE_APPROVAL or DENY with an Ed25519-signed record. A timeout, outage or unknown verdict never becomes ALLOW. A brand-new agent has no trust history, so its first actions usually come back REQUIRE_APPROVAL.

Python (zero dependencies)

pip install https://cainstudio.online/cainstudio-0.3.0-py3-none-any.whl
export CAIN_API_KEY=...   # free key: https://cainstudio.online/signup

import cainstudio

@cainstudio.guard()
def transfer(amount_usd: float, to: str) -> str:
    ...  # runs only if CAIN allows this call, with these arguments

try:
    transfer(5000, "acme")
except cainstudio.ApprovalRequired as e:
    print("held for a human:", e.approval_id)
except cainstudio.ActionBlocked as e:
    print("refused:", e.decision.reasons)
except cainstudio.CainUnavailable:
    print("CAIN unreachable: not run")   # fail-closed

See a real decision with no account

cainstudio try          # live pipeline, stage by stage
cainstudio try --list   # the other attack scenarios

MCP clients (Claude Code, Cursor)

claude mcp add --transport http cain https://cainstudio.online/mcp

More: Python SDK · TypeScript SDK · framework integrations · AI quickstart · decision signing key

Tested guarantees in this area

Every rule in these niches has its own page with its recorded result.

• Identity, authority & delegation: 964 tested invariants — Who an agent is, what it may do, and who allowed it.
• Evidence, receipts & proofs: 928 tested invariants — Signed records that prove what happened, checkable by anyone.

Related

• Agents — Register agents, give each its own key, and see how far each is trusted.
• API keys — Your API key and a copy-paste quickstart.
• Consensus cluster — See the consensus cluster that signs your decisions, checked in your browser.
• Evaluation — Shows which plan your real usage fits.
• Live decisions — Watch decisions arrive live as your agents work.
• Overview — Your dashboard: how many actions were allowed, held or blocked.
• Plan & billing — Your plan, usage and upgrades.
• Settings — Choose enforce mode or watch-only mode, and manage your account.
• Team — Invite teammates with the right role each.
• Traces — Replay any agent run step by step.