01 / Propose
AI returns a decisionThe candidate includes an action, target, confidence score, and reason. It has not received permission to act.
n8n action firewall - credential-free workflow
AI decision control layer
Put an action firewall between AI output and real tools.
Let the model propose a decision. Then apply deterministic schema, allowlist, target, and confidence checks before any credentialed node can send, update, refund, publish, or write.
The FIRST10 launch code is prefilled for the first 10 customers through August 4, 2026. Regular price: $19 once. Confirm the total at Stripe checkout.
The boundary
Propose, validate, then act or review.
02 / Validate
Policy decides the routeDeterministic checks compare the candidate with the caller's schema, allowlists, targets, and threshold.
03 / Route
Continue or human reviewApproved output may reach a separate downstream step. Everything else stops at a visible review branch.
What makes it an action firewall
The control is separate from both the model and the tool.
What the import includes
- A credential-free n8n webhook workflow
- Strict structured-decision validation
- Action and target allowlists
- A confidence threshold and one bounded retry
- Continue and human-review routes
What stays outside the gate
- Your AI model, prompt, and provider credentials
- Email, CRM, payment, publishing, or database credentials
- The consequential action itself
- Legal, compliance, security, and human judgment
- Any hosted moderation or scanning subscription
This is a workflow reliability control, not a security guarantee. Keep least-privilege access, current software, logs, and human approval wherever the consequence requires them.
Four deterministic checks
Valid JSON is only the first gate.
Validate the contract
Reject malformed JSON, missing fields, wrong types, and incomplete decisions before policy is evaluated.
Enforce caller allowlists
Compare the requested action and target with explicit values supplied by the workflow that owns the consequence.
Apply a confidence floor
Send uncertain decisions to review instead of treating a valid shape as permission to proceed.
Return a route, not an action
The gate returns continue or human_review. Credentials and external action nodes remain downstream.
Where the boundary helps
Use it before an AI decision can create a consequence.
Customer operations
Email, tickets, and CRM updatesGate the intended action and destination before a message is sent or a customer record changes.
Money and access
Refunds, credits, and account changesKeep high-impact requests on an allowlist and send uncertain decisions to a person.
Publishing
Posts, documents, and database writesSeparate content generation from permission to publish or change a source of truth.
Inspect before buying
The free validator and executed proof use the same contract.
Try a decision in the browser
- Paste a structured AI decision
- Change actions, targets, and confidence
- See continue or human_review
- No upload, storage, or external action
Review the executed evidence
- 9/9 focused contract tests
- Malformed and disallowed cases
- Bounded retry behavior
- Zero external actions in every case
Before importing
Straight answers about the control boundary.
What is an n8n AI action firewall?
It is a deterministic workflow step placed after AI output and before a credentialed action. It evaluates policy and returns either continue or human_review.
Does it execute tool calls?
No. The gate has no credentials and performs no external action. A separate downstream node may act only after the route has been evaluated.
Is this a hosted moderation API?
No. It is an importable n8n workflow. It does not include an AI model, hosted scanning service, API key, or subscription.
Can I inspect it before paying?
Yes. Use the free browser validator, read the implementation guide, and inspect the executed reliability evidence first.
A small gate before a real consequence
Keep the AI step away from credentials until policy agrees.
One-time importable workflow. No included API usage.