Cursor
Windsurf
Google AntigravityIt knows your system.
A map of your code, so it knows what an agent is touching before it writes a line.
Cursorbilling/refund.tsPOST /refundsCalls it
approvals.second(order)Inside it
payments.refund(order)Runs after it
Known before the agent writes a line
It holds your rules.
The rules your seniors repeat in review, mined from your code with their evidence and approved by your team.
Every query is scoped to the tenant.
rules/data-access.mdawait db.invoices.find({ id, tenant: req.tenant })Scoped to the tenant, at the line
It decides at the moment of action.
Outside the agent's reach, it picks the rules that apply and refuses a DROP TABLE before it runs.
Cursor wants to runDROP TABLE invoices;
- Read
- Checked against your guards
- Refused
- Run
Stopped before it ran.
It learns.
When the code changes or a rule is missing, it proposes one. A person approves it, every agent follows.
billing/refund.ts:41approvals.second(order);refund(billing/credits.ts:88approvals.second(credit);refund(support/goodwill.ts:23approvals.second(ticket);refund(admin/override.ts:57approvals.second(order);refund(jobs/chargebacks.ts:132approvals.second(dispute);refund(
Refunds above €500 need a second approver.
Proposed from 5 places in your codeApproved once by Sofia M.
Claude Code- Cursor
OpenAI Codex
GitHub Copilot
Windsurf
Google Antigravity
It remembers.
Every rule served and every action refused, on the record, for whoever has to prove it.
Cursorsrc/billing/cart-checkout.ts3 rules served
DROP TABLE invoices;Blocked
CWE-89, src/db/users.repo.ts:42Finding fixed
Traced to Sofia M., in the Brain
The security brain for AI agents
Your agents follow your rules. And you can prove it.
npx -y @cybedefend/vibedefend@latest install✓Fixed in the same session
The brain knows your company.
A guard knows what is dangerous everywhere.
| Question | A scanner | A guard | The brain |
|---|---|---|---|
| What it knows | Known flaws | What is dangerous anywhere | Your system and your rules |
| When it acts | Once the code is written | When the agent acts | Before every edit and action |
| What you keep | Alerts to sort | A log of blocks | Every rule served and action refused |
Less rework. Measured.
One agent, thirty tickets, three setups, blind audits. Rerun it yourself.
8×
fewer broken rules per ticket 2.28 with no tool, 2.27 with a rules file, 0.28 with VibeDefend
~$400,000
saved a year, for twenty developers computed from the measured rates
6
coding agents wired by one command Claude Code, Cursor, Windsurf, Copilot, Codex, Antigravity
Everything your agents do, on one map.
PaymentsPlatformMobileDataGrowthCorecheckout-apiledgerbilling-webpayouts-workerfraud-rulesapi-gatewayauth-serviceadmin-consoleinfra-terraformios-appandroid-appmobile-bffevents-pipelinewarehouseml-featuresreportingweb-appexperimentsmarketing-siteuser-servicenotificationssearch-api
Day 1: rules, guards and scans, live from the first session.
Day 30: every rule served and every action blocked, ready for your audit.
A demo organisation: its names, people and figures are fictitious.They ship with it every day.
Vulnerability analysis and remediation have become significantly faster. We save valuable time every day.
OlivierIt secures our projects by detecting and fixing vulnerabilities in code and dependencies, with seamless integration.
GeoffreyWe tried the same approach with other AIs and never got results this convincing.
Alexandre Lignon
Every agent. One brain.
Developers first, because their agents act the most. Then everyone else who works with one.
npx -y @cybedefend/vibedefend@latest install- Claude Code
- Cursor
- Windsurf
- GitHub Copilot
- OpenAI Codex
- Google Antigravity
In detail
How it works, step by step
Wired.
Served.
Guarded.
Checked.
Proved.
Learned.
One developer's day, as the team sees it
Per developer, not per repository: the rules each agent was served, and what it was stopped from doing.
- Served 3 rules on
src/api/refunds.ts - Tried
rm -rf ./migrations - Tried to read
.env, used the managed reference - Diff checked before the commit, one finding fixed
- Proposed a rule: refunds above €500 need a second approver
Why a rules file is not enough
A rules file does not fix it. The rule was in the file, word for word, and the agent broke it anyway.
2.27
rules broken per ticket with a rules file kept by hand. Without any file: 2.28.
Controlled study, August 2026
What people ask first.
What is CybeDefend?
CybeDefend is the security brain for AI agents. It knows your system through a map of your code, holds your business and security rules, and decides at the moment each agent acts which rules apply and which actions are refused. It keeps the record of every rule served and every action refused. VibeDefend, its agent layer, works inside Claude Code, Cursor, Windsurf, GitHub Copilot, OpenAI Codex and Google Antigravity.
How is it different from a code scanner?
A scanner reads code after it is written and sends alerts to people. CybeDefend works while the agent writes: it hands the agent your rules before the edit, stops what must never run, and gives the agent one finding it can fix in the same session. The scan is still there, on the change, before the commit.
Is it an AI model?
No. The brain sits above your agents, not inside a model. It knows your code, holds your rules and picks the ones that apply to what an agent is doing. Blocking is deterministic: a rule decides, and a model is only a second opinion.
Do I replace my scanner or my guard?
No, keep them. A scanner reads code once it is written, a guard knows what is dangerous for any company. The brain adds what neither of them knows, your system and your own rules, at the moment each agent acts. Every change is still scanned before the commit.
Does it cover people who don't code?
Yes, through the agents they use. Developers come first because their agents act the most. When someone else uses Claude Code, Cursor or Codex to write an email, drive a browser or call an API, each of those actions is a tool call, and the brain checks it like any other.
How do I install it?
Run one command in any terminal, on macOS, Linux or Windows, with Node 18.17 or later. The installer finds the coding agents on your machine and wires each of them; you choose your region, EU or US, and sign in once in your browser.
Does it work? What was measured?
In CybeDefend's controlled study of 24 August 2026, one agent worked the same thirty tickets in three setups. With VibeDefend it applied 89% of the precise rules, against 12% with no tool and 13% with a rules file kept by hand. The protocol, the transcripts and the blind audits are public.
My agent already checks its own code. Why add CybeDefend?
Each agent checks its own work, with its own settings. CybeDefend gives all six agents the same rules, your business rules included, served before the edit rather than reviewed after it, and keeps one record of what each agent was served, what was blocked and what was fixed.